Given that 64 bit Cygwin defines all file access types (off_t,
fpos_t, and derived types) as 64 bit anyway, there's no reason
left to rely on the stdio64 part of newlib. Use base functions
and base types.
Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
- Previously, LoadLibraryA() is hooked for ConEmu cygwin connector.
With this patch, GetProcAddress() for "RequestTermConnector" is
hooked instead which is more essential for ConEmu cygwin connector.
- Recent commit "Cygwin: console: Add missing input_mutex guard."
has a problem that causes NULL pointer access if cygheap->ctty
is NULL. This patch fixes the issue.
gdb master recently learnt how to use GetThreadDescription() [1], so set
threadnames using SetThreadDescription() [available since Windows 10
1607] as well.
This is superior to using a special exception to indicate the thread
name to the debugger, because the thread name isn't missed if you don't
have a debugger attached at the time it's set.
It's not clear what the encoding of a thread name string is, we assume
UTF8 for the moment.
For the moment, continue to use the old method as well, for the benefit
of older gdb versions etc.
[1] https://sourceware.org/pipermail/gdb-patches/2022-April/187833.html
Back in early Cygwin development a function based access to the
environment was exported, the internal environ in Cygwin was called
__cygwin_environ and cur_environ() was used to access the environment
indirectly . The history of that necessity is not documented,
but kept in i686 for backward compatibility.
The x86_64 port eventually used __cygwin_environ directly and exported
it as DATA under the usual name environ.
We don't need the i686 workaround anymore, so just rename
__cygwin_environ to environ, drop the cur_environ() macro and
simply export environ under its own name.
Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
- rename "is64bit" to "is_x86_64"
- Always set sym_prefix to empty string and add a FIXME
- speclib: rename uscore to sym_prefix and fix bug in string handling
Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
- ConEmu cygwin connector conflicts with cons_master_thread since
it does not use read() to read console input. With this patch,
cons_master_thread is disabled in ConEmu cygwin connector.
Somehow this patch looks like it was pushed before having been
finished. Let's try again...
Fixes: e46f15c2d1 ("Cygwin: hookapi: drop handling i386 targets")
Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
Only the assembler snippet is really x86_64-specific, so minimize the
conditional code block to this snippet.
Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
Add a _REENT_CLEANUP() macro to encapsulate access to the
__cleanup member of struct reent. This will help to replace the
struct member with a thread-local storage object in a follow up
patch.
Add a _REENT_ERRNO() macro to encapsulate the access to the
_errno member of struct reent. This will help to replace the
structure member with a thread-local storage object in a follow
up patch.
Replace uses of __errno_r() with _REENT_ERRNO(). Keep __errno_r() macro for
potential users outside of Newlib.
- OpenClipboard() just after CloseClipboard() sometimes fails. Due
to this, /dev/clipboard sometimes fails to set CF_UNICODETEXT
data. This patch add a workaround for this issue.
Define FD_SETSIZE (<sys/select.h>) to be 1024 by default, and define
NOFILE (<sys/param.h>) to be OPEN_MAX (== 3200) by default.
Remove the comment in <sys/select.h> that FD_SETSIZE should be >=
NOFILE.
Bump API minor.
Addresses: https://cygwin.com/pipermail/cygwin/2022-July/251839.html
- With this patch, the empty path (empty element in PATH or PATH is
absent) is treated as the current directory as Linux does. This
feature is added for Linux compatibility, but it is deprecated.
POSIX notes that a conforming application shall use an explicit
pathname to specify the current working directory.
Addresses: https://cygwin.com/pipermail/cygwin/2022-June/251730.html
This reverts commit 1f8f7e2d54, "* libc/stdio/refill.c (__srefill):
Try again after EOF on Cygwin." If EOF is set on a file, the stdio
input functions will now immediately return EOF rather than trying
again to read. This aligns Cygwin's behavior to that of Linux.
Addresses: https://cygwin.com/pipermail/cygwin/2022-June/251672.html
- poll() has a bug that it returns event which is not inquired if
events are inquired in multiple pollfd entries on the same fd at
the same time. This patch fixes the issue.
Addresses: https://cygwin.com/pipermail/cygwin/2022-June/251732.html
- Currently, ENABLE_VIRTUAL_TERMINAL_PROCESSING flag is disabled
unconditionally when exiting from cygwin. This causes ANSI escape
sequence disabled in Windows Terminal where it is enables by
default. This patch retains that flag if it is originally enabled.
Commit e1ce752a1d, "Cygwin: remove miscellaneous 32-bit code", removed
most occurrences of '#ifdef __x86_64__'. Restore those occurrences
that guarded code specific to the AMD64 processor, and #error out if
the processor is different. This will make it easier to find
AMD64-specific code if we ever want to add support for a different
64-bit processor (e.g., ARM64).
The _REENT_GLOBAL_STDIO_STREAMS was introduced by commit
668a4c8722 in 2017. Since then it was enabled by
default for RTEMS. Recently, the option was enabled for Cygwin which
previously used an alternative implementation to use global stdio streams.
In Newlib, the stdio streams are defined to thread-specific pointers
_reent::_stdin, _reent::_stdout and _reent::_stderr. If the option is disabled
(the default for most systems), then these pointers are initialized to
thread-specific FILE objects which use file descriptors 0, 1, and 2,
respectively. There are at least three problems with this:
(1) The thread-specific FILE objects are closed by _reclaim_reent(). This
leads to problems with language run-time libraries that provide wrappers to
the C/POSIX stdio streams (for example C++ and Ada), since they use the
thread-specific FILE objects of the initialization thread. In case the
initialization thread is deleted, then they use freed memory.
(2) Since thread-specific FILE objects are used with a common output device via
file descriptors 0, 1 and 2, the locking at FILE object level cannot ensure
atomicity of the output, e.g. a call to printf().
(3) There are resource managment issues, see:
https://sourceware.org/pipermail/newlib/2022/019558.htmlhttps://bugs.linaro.org/show_bug.cgi?id=5841
This patch enables the _REENT_GLOBAL_STDIO_STREAMS behaviour for all Newlib
configurations and removes the option. This removes a couple of #ifdef blocks.
In the previous commit, __stdcall was removed from _dll_crt0 in
winsup.h and dcrt0.cc but not in lib/cygwin_crt0.c. For consistency,
restore the first two occurrences of __stdcall. We could instead
remove it from the declaration in lib/cygwin_crt0.c, but this might
appear to affect binary compatibility, even though it really doesn't.
These have no effect on x86_64. Retain a few occurrences of __cdecl
in files imported from other sources.
Also retain all occurrences of WINAPI, even though the latter is
simply a macro that expands to __stdcall. Most of these occurrences
are associated with Windows API functions, and removing them might
make the code confusing instead of simpler.
Remove "32" or "64" from each of the following names: acl32,
aclcheck32, aclfrommode32, aclfrompbits32, aclfromtext32, aclsort32,
acltomode32, acltopbits32, acltotext32, facl32, fchown32, fcntl64,
fstat64, _fstat64, _fstat64_r, ftruncate64, getgid32, getgrent32,
getgrgid32, getgrnam32, getgroups32, getpwuid32, getpwuid_r32,
getuid32, getuid32, initgroups32, lseek64, lstat64, mknod32, mmap64,
setegid32, seteuid32, setgid32, setgroups32, setregid32, setreuid32,
setuid32, stat64, _stat64_r, truncate64.
Remove prototypes and macro definitions of these names.
Remove "#ifndef __INSIDE_CYGWIN__" from some headers so that the new
names will be available when compiling Cygwin.
Remove aliases that are no longer needed.
Include <unistd.h> in fhandler_clipboard.cc for the declarations of
geteuid and getegid.
Remove the definitions of the following: acl, aclcheck, aclfrommode,
aclfrompbits, aclfromtext, aclsort, acltomode, acltopbits, acltotext,
chown, fchown, _fcntl, fstat, _fstat_r, ftruncate, getegid, geteuid, getgid,
getgrent, getgrgid, getgrnam, getgroups, getpwduid, getpwuid,
getpwuid_r, getuid, initgroups, lacl, lacl32, lchown, lseek, lstat,
mknod, mmap, setegid, seteuid, setgid, setgroups, setregid, setreuid,
setuid, stat, _stat_r, truncate.
[For most of these, the corresponding 64-bit entry points are obtained
by exporting aliases. For example, acl is an alias for acl32, and
truncate is an alias for truncate64.]
Remove the following structs and all code using them (which is 32-bit
only): __stat32, __group16, __flock32, __aclent16_t.
Remove the typedefs of __blkcnt32_t __dev16_t, __ino32_t, which are
used only in code that has been removed.
Put the typedefs of __uid16_t and __gid16_t in one header, instead of
one header if __INSIDE_CYGWIN__ is defined and a different header
otherwise.
The current definition of mknod in syscalls.cc has a third argument of
type __dev16_t instead of dev_t. Fix this on 64-bit Cygwin by making
the existing mknod 32-bit only and then exporting mknod as an alias
for mknod32. (No fix is needed on 32-bit because mknod is redirected
to mknod32 via NEW_FUNCTIONS in Makefile.am.)
Addresses: https://cygwin.com/pipermail/cygwin-developers/2022-May/012589.html
killpg(pgid, 0) (or kill_pgrp(pgid, si_signo=0), in signal.cc)
fails (returns -1) even when there is a process in the process
group pgid, if the process is in the middle of spawnve(), see
https://cygwin.com/pipermail/cygwin/2022-May/251479.html
When exec'ing a process the assumption is that the exec'ed process creates its
own symlink (in pinfo::thisproc() in pinfo.cc). If the exec'ing process
calls NtClose on it's own winpid symlink, but the exec'ed process didn't
progress enough into initialization, there's a slim chance that neither
the exec'ing process, nor the exec'ed process has a winpid symlink
attached.
Always create the winpid symlink in spawn.cc, even for exec'ed Cygwin
processes. Make sure to dup the handle into the new process, and stop
creating the winpid symlink in exec'ed processes.
Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
- The commit "Cygwin: fix new sigfe.o generation in optimized case"
fixed the wrong tlsoffsets generation by adding -O0 to compile
options. Current gentls_offsets expects entry of "start_offset"
is the first entry in the assembler code. However, without -O0,
entry of "start_offset" goes to the last entry for some reason.
Currently, -O0 can prevents assembler code from reversing the
order of the entries, however, there is no guarantee that it will
retain the order of the entries in the future.
This patch makes gentls_offsets parse the assembler code in the
two pass to omit -O0 option dependency.
Leave x86_64 CPU-specific code and #error out when trying to build
for another target. Access special registers CPU-agnostic.
Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
- Previously, the command "cmd /c script -c cmd" in console of Win7
crashes. This seems to be due to a bug (?) of AttachConsole().
This patch adds workaround for this issue.
Currently, pty reattaches to the console of the process which is
predetermined by ConsoleProcessList() after temporarily attaching
to another console. After that, the console output handle opened
with the name "CONOUT$" may not be accessible in Win7.
This seems to happen when the attached process does not have the
same handle even if the console attached is the same. With this
patch, cygwin-console-helper which is started when pty master is
opened in console, is utilized to be a target process to which
pty reattaches if the OS is Win7.
Commit 0597c84b9b ("Cygwin: revamp TLS offsets computation")
introduced a really weird problem when building Cygwin with
optimization.
First of all, the tlsoffsets file is broken with -O2. This
can easily be fixed by running the compiler with -O0 when called
from the gentls_offsets script.
But it gets worse:
When creating sigfe.o with optimization, the generated machine code
uses incorrect offsets: For some reason the assembler codes using
_cygtls.stackptr as offset value are assembled into machine code
using _cygtls.pstackptr as offsets.
And as if that isn't already absurd enough, renaming _cygtls.pstackptr
to, say, _cygtls.blurb, fixes the assembled machine code expressions;
they use the value of _cygtls.stackptr again.
So I changed gentls_offsets and gendef to use _cygtls.foo_p rather
than _cygtls.pfoo and that fixes the assembled code in the optimized
case.
No, I can't explain that. There's no system in that behaviour.
It looks absolutely crazy.
Fixes: 0597c84b9b ("Cygwin: revamp TLS offsets computation")
Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
Given we only called create_token on W7 WOW64 anyway, we can now
drop this function and all other functions only called from there
entirely.
Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
- convert gentls_offsets to a shell script, only running the target
compiler and gawk.
- Simplify cygtls.h. The new gentls_offsets script only requires two
lines with the "public:" keyword as markers. The comments are not
used anymore, the output is a preprocesses file without comments.
Align Makefile rules accordingly.
- Rather than generating perl variables and C #defines, just generate
.ecu statements and .include the TLS offsets file right from the
generated assembler file sigfe.s. It's the only place we really
need (some of) the offsets.
- Drop the target-specific name of the TLS offsets file and generate
it on the fly in the build dir. Fix configure and Makefile rules
accordingly.
Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
Define default values for DLL_ENTRY, DIN_FILE, and TLSOFFSETS_H
and drop them from the x86_64-specific branch. Keep the mechanism
intact to allow other target CPUs if there ever will be.
Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
This was a hack to begin with. Clean this mess up:
- Move definition of CYGTLS_PADSIZE to cygwin/config.h and drop
local cygtls_padsize.h
- Rename CYGTLS_PADSIZE to __CYGTLS_PADSIZE__ to keep namespace
clean. Redefine as macro, rather than as const.
- Move struct _reent first in struct _cygtls to allow using
__CYGTLS_PADSIZE__ as offset in __getreent().
Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
Added a new global __sglue object for all configurations.
Decouples the global file object list from the _GLOBAL_REENT
structure by using this new object instead of the __sglue member
of _GLOBAL_REENT in __sfp() and _fwalk_sglue().
Replaced _fwalk_reent() with _fwalk_sglue(). The change adds an
extra __sglue object as a parameter, which will allow the passing
of a global __sglue object separate from the __sglue member of
struct _reent. The global __sglue object will be added in a
follow-on patch.
fix tty_nr maj/min bits, vmmaxrss units, and x86 format mismatch:
ctty maj is 31:16, min is 15:0; tty_nr s/b maj 15:8, min 31:20, 7:0;
vmmaxrss s/b bytes not pages;
times all 64 bit - change formats of first two instances from %lu to %U;
realign sprintf formats and variables/values in more logical groups
- Previously, script command sometimes crashes by Ctrl-C in Win 7
if it is running in console, and non-cygwin app is foreground.
This patch fixes the issue.
- The recent commit "Cygwin: pty: Fix timing of creating invisible
console." breaks the feature added by commit 72770148, which
prevents pty from changing code page of parent console. This patch
restores that.
- Previously, invisible console was created in fixup_after_exec().
However, actually this should be done in fixup_after_fork(). this
patch fixes the issue.
- When temporarily attaching a console, the timing of acquiring
attach_mutex was not appropriate. This sometimes caused master
forwarding thread to crash on Ctrl-C in Windows 7. This patch
fixes the issue.
Remove the pointer indirection through the read-only _global_impure_ptr and
directly use a externally visible _impure_data object of type struct _reent.
This enables the static initialization of global data structures in a follow up
patch. In addition, we get rid of a machine-specific file.
By including sys/_stdint.h, all types from stdint.h are
exposed even if stdint.h isn't pulled in explicitely. Include
<machine/_default_types.h instead. Fix up newlib and Cygwin
files which rely on stdint.h types, too.
Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
Even after fork, we might need the parent sigmask without having
access to the real _main_tls. There's a short time at process startup,
when _main_tls points to the system-allocated stack, but wait_sig is
already running. If we can't lock _main_tls, because find_tls can't
find it yet, we now access the parent's sigmask via child_info.
Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
The x86_64 thread stack area collides with the share user data in
recent versions of Windows. Let's get ourselvels get out of the
way and move the thread stack area in the former slack space
between DLL area and heap, from 0x6:00000000 to 0x8:00000000.
That quadruplicates the stack area, so allow bigger maximum stack
sizes.
Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
Originally the function was designed to be used in forked
processes as well, but it has never been used this way. Drop
the parameter only required for forkees.
Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
A recent patch fixed gmondump to stop printing "0x0x" as an address
prefix. It turns out the Cygwin User's Guide and the gmondump and
ssp man pages (all from utils.xml) have examples of the same error.
- In the latest GDB (11.2-1), Ctrl-C behaviour is broken a bit for
non-cygwin inferior. For example, Ctrl-C on GDB prompt is not sent
to GDB but to the inferior. This patch fixes the issue.
- The internal handles in HPCON should not be inheritable, however,
the current code duplicates them as inheritable when handing over
ownership of the pseudo console. This patch fixes the issue.
Addresses: https://cygwin.com/pipermail/cygwin/2022-April/251222.html
- Currently, close_pseudoconsole() is called unconditionally from
fhandler_termios::process_sigs() on Ctrl-C. This causes deadlock
if Ctrl-C is pressed while setup_pseudoconsole() is called. With
this patch, close_pseudoconsole() is called only if the master
process is the owner of the nat-pipe to avoid the deadlock.
- As mentioned in commit message of the commit b531d6b0, if multiple
writers including non-cygwin app exist, the non-cygwin app cannot
detect pipe closure on the read side when the pipe is created by
system account or the the pipe creator is running as service.
This is because query_hdl which is held in write side also is a
read end of the pipe, so the pipe is still alive for the non-cygwin
app even after the reader is closed.
To avoid this problem, this patch lets all processes in the same
process group close query_hdl using newly introduced internal signal
__SIGNONCYGCHLD when non-cygwin app is started.
Addresses: https://cygwin.com/pipermail/cygwin/2022-March/251097.html
- Using memcmp() to compare structure such as INPUT_RECORD is not
correct manner because padding may not be initialized. This patch
stops to use memcmp() for comparison of INPUT_RECORD.
- dwControlKeyState also may be null'ed on WriteConsoleInputW().
Therefore ignore it in event comparison as well as wVirtualKeyCode
and wVirtualScanCode.
- The commit "Cygwin: console: Improve the code to avoid typeahead
key swapping." did not solve the problem enough. Two unexpected
things happen.
(1) wVirtualKeyCode and wVirtualScanCode of readback key event may
be null'ed even if they are not zero on WriteConsoleInputW().
Therefore, memcmp() may report the event sequence is not equal.
(2) WriteConsoleInputW() may not be atomic. The event sequence
which is written by WriteConsoleInputW() may be inserted by
key input in the middle of the sequence. Current code gives
up to fix in this situation.
This patch should fix that issue.
Convert all the libc/ subdir makes into the top-level Makefile. This
allows us to build all of libc from the top Makefile without using any
recursive make calls. This is faster and avoids the funky lib.a logic
where we unpack subdir archives to repack into a single libc.a. The
machine override logic is maintained though by way of Makefile include
ordering, and source file accumulation in libc_a_SOURCES.
There's a few dummy.c files that are no longer necessary since we aren't
doing the lib.a accumulating, so punt them.
The winsup code has been pulling the internal newlib ssp library out,
but that doesn't exist anymore, so change that to pull the objects.
- If UNC path for DFS is mounted to a drive with drive letter, the
error "Too many levels of symbolic links" occurs when accessing
to that drive. This is because GetDosDeviceW() returns unexpected
string such as "\Device\Mup\DfsClient\;Z:000000000003fb89\dfsserver
\dfs\linkname" for the mounted UNC path "\??\UNC\fileserver\share".
This patch adds a workaround for this issue.
Addresses: https://cygwin.com/pipermail/cygwin/2022-March/250979.html
- After the commit "Cygwin: pty, console: Fix handle leak which
occurs on exec() error.", startxwin cannot start X due to the
error "Failed to activate virtual core keyboard: 2". The problem
is access violation in the code retrieving the pgid of the ctty.
This patch fixes the issue.
Addresses: https://cygwin.com/pipermail/cygwin/2022-March/251013.html
- Currently, tty::pcon_start flag is cleared before transfer_input()
in master::write(), however, the code in setup_pseudoconsole()
waits for transfer_input() using tty::pcon_start. This possibly
causes the race issue. The patch fixes this potential issue.
- This patch removes the old code which calls transfer_input() but
is no longer needed. These code was necessary indeed in the past,
however, as a result of recent frequent code changes, it is no
longer needed.
- Previously, reset_switch_to_nat_pipe() is called from many places
in pty code. This patch reorganizes that. With this patch, it is
called only from bg_check() and setpgid_aux(). The calls which
does not have enough reason have been omitted.
- To make read() work properly in canonical mode, writing to the pty
pipe should be done line by line. However, only CR was treated as
line separator previously in transfer_input(). This patch fixes
the issue.
- Previously, the PID_NEW_PG flag was also used as a marker for GDB
with non-cygwin inferior, unlike its original meaning. With this
patch, the condition exec_dwProcessId == dwProcessId is used as a
marker for that instead.
We return -1 with errno set to EINVAL for sysconf options for
values required by POSIX, but not implemented on Cygwin.
This is incorrect. Return -1, but don't set errno for these options.
Drop the "nsup" enum to indicate unsupported values, it's not
required anymore.
Fixes: 59e3b6ca7d (CVS import)
Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
When adding the timer_getoverrun function, DELAYTIMER_MAX was added
to limits.h, but the return value of sysconf(_SC_DELAYTIMER_MAX) wasn't
changed accordingly. Fix that now.
Fixes: 9e295a8d19 ("Cygwin: posix timers: implement timer_getoverrun")
Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
- transfer_input() function uses console api, so it should be guarded
by attach_mutex. However, in most cases, it is missing. This patch
fixes the issue.
- This patch communalizes the code for attaching another console
temporarily and resuming to the original attach state, because
there were a plurality of similar codes throughout.
- This patch revises the acquiring/releasing timing for attach_mutex
to make the period in which it is being acquired shorter. Further,
acquiring/releasing are added to where they are missing but needed.
- In fhandler_console::cons_master_thread(), a struct which has
only a static function is used. In this case, struct instance
is not necessary. So with this patch, the static function is
invoked without creating instance.
So far the values of SigPnd and SigBlk were always 0 and SigIgn
was incorrectly set to the block mask of the current thread of
the calling process.
Fix that by adding a _pinfo::siginfo method and a PICOM_SIGINFO
message to allow to request actual signal info of any running process.
Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
The "how" value only makes sense if a new set is given. If we
only read the current signal set, ignore the value of "how" per
POSIX:
"If set is a null pointer, the value of the argument how is not
significant"
Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
- With this patch, some pty functions/variables have been renamed
so that the name *pcon* is not used for those that are called
even when the pseudo console is not active.
- When Ctrl-C terminates a non-cygwin process on a pseudo console,
pty master attaches to the pseudo console first, and send
CTRL_C_EVENT. If the non-cygwin process closes the pseudo console
before the pty master calls FreeConsole(), the pty master process
will crash. With this patch, pty master process takes over the
ownership of the pseudo console, and closes it by myself.
- With this patch, unique invisible consoles are created for each pty
to isolate CTRL_C_EVENTs between ptys. This is necessary by Ctrl-C
handling in fhandler_termios::process_sigs() for non-cygwin apps
started in pty if the pseudo console is disabled.
- The commit "Cygwin: console: Prevent the order of typeahead input
from swapped." did not fully resolve the issue. If keys are typed
during input buffer fix, the order of key event may be swapped.
This patch fixes the issue again.
- The recent commit "Cygwin: pinfo: Fix exit code when non-cygwin app
exits by Ctrl-C." did not fix enough the issue. If a non-cygwin app
is reading the console, it will not return STATUS_CONTROL_C_EXIT
even if it is terminated by Ctrl-C. As a result, the previous patch
does not take effect.
This patch solves this issue by setting sigExeced to SIGINT in
ctrl_c_handler(). In addition, sigExeced will be cleared if the app
does not terminated within predetermined time period. The reason is
that the app does not seem to be terminated by the signal sigExeced.
- The commit "Cygwin: console: Fix issues of apps which open pty."
did not fix the second problem correctly. That commit looked to
fix the issue, but the actual problem was that ctrl_c_handler()
should be reregistered *AFTER* FreeConsole()/AttachConsole().
This patch correct that.
- The commit "Cygwin: console: Restore CTRL_BREAK_EVENT handling."
was accidentally mixed with experimental code in exceptions.cc.
Due to this, non-cygwin app receives CTRL_C_EVENT twice in the
following scenario.
1) Run 'sleep 10 | <non-cygwin app>'
2) Hit Ctrl-C.
3) The non-cygwin app receives CTRL_C_EVENT twice.
This patch reverts the code with the problem.
- If a lot of keys are typed very quickly in the app which does
not read console, the order of input keys in console input buffer
occasionally swapped. Although this extremely rarely happens,
is obviously a bug of cons_master_thread. This patch fixes the
issue.
- The commit "Cygwin: console: Redesign handling of special keys."
removes special treatment for pty in with pseudo console activated,
however, it is necessary on second thought. This is because sending
CTRL_C_EVENT to non-cygwin apps will be done in pseudo console,
therefore, sending it in fhandler_pty_master::write() duplicates
that event for non-cygwin apps.
- After some recent changes for special keys handling break the
apps which open pty (such as script command). If the app which
opens pty is executed in console, the following issues occur.
1) If the script command was started from non-cygwin shell
(such as cmd.exe), another cygwin app started in pty slave
cannot receive Ctrl-C.
2) If non-cygwin app is executed in pty slave, the app which
opened the pty (e.g. script command) crashes by Ctrl-C.
This patch fixes these issues.
- Previously, if non-cygwin app exits by Ctrl-C, exit code was
0x00007f00. With this patch, the exit code will be 0x00000002,
which means process exited by SIGINT.
- The recent change by the commit "Cygwin: console: Redesign handling
of special keys." breaks the handling of CTRL_BREAK_EVENT. The login
shell in console exits on Ctrl-Break key. This patch fixes the issue.
- The inferior of the GDB cannot be continued after SIGINT even
though nopass option is set. This seems because cygwin GDB does
not support hooking cygwin signal. Therefore, a workaround for
GDB is added. With this patch, only CTRL_C_EVENT is sent to the
GDB inferior by Ctrl-C and sending SIGINT is omitted. Note that
"handle SIGINT (no)pass" command does not take effect even with
or without this patch.
- This patch rearranges the cooperation between cons_master_thread,
line_edit, and ctrl_c_handler so that only one of them operates
at the same time. Since these handle Ctrl-C individually, so the
signal may be sent multiple times to the process. This patch fixes
the issue.
Bash has a very convenient feature that is called process substitution
(e.g. `diff -u <(seq 0 10) <(seq 1 11)`). To make this work, Bash
requires the `/dev/fd` symlink to exist, and Cygwin therefore creates
this symlink (together with the `stdin`, `stdout` and `stderr` ones)
upon start-up.
This strategy is incompatible with the idea of providing a subset of
Cygwin in a `.zip` file (because there is no standard way to represent
symlinks in `.zip` files, and besides, older Windows versions would
potentially lack support for them anyway).
That type of `.zip` file is what Git for Windows wants to use, though,
bundling a minimal subset for third-party applications in MinGit (see
https://github.com/git-for-windows/git/wiki/MinGit for details).
Let's side-step this problem completely by creating those symlinks
implicitly, similar to the way `/dev/` is populated with special
devices.
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Remove dependency on __sdidinit member of struct _reent to check
object initialization. Like __sdidinit, the __cleanup member of
struct _reent is initialized in the __sinit() function. Checking
initialization against __cleanup serves the same purpose and will
reduce overhead in the __sfp() function in a follow up patch.
- This patch fixes the handle leak which occurs when exec() fails
with an error. The duplicated handles will be closed when the
exec'ed process is terminated. However, if exec() fails, the code
path does not reach to the code closing the duplicated handles.
To implement this fix more appropriately, the setup, cleanup and
closing pty codes which was previously located in spawn.cc are
encapsulated into the fhandler_pty_slave class functions.
- Calling fix_tab_position() is necessary in Windows 10 with xterm
compatible mode enabled, because it has a problem that the tab
positions will be broken when the window size is changed. Fortunately,
this problem has been fixed in Windows 11. Therefore, with this patch,
necessity of fix_tab_position() call is determined by referring to
wincap.has_con_broken_tabs(), which is recently introduced.
- With this patch, all set_(in|out)put_mode() calls are rearranged
as follows.
1) Setup for cygwin apps, started from non-cygwin app, is done
in fhandler_console::post_open_setup(), which overrides
fhandler_base::post_open_setup() called from dtable.cc.
2) Cleanup for cygwin app is done in fhandler_console::close().
3) Setup for cygwin apps is also in fhandler_console::bg_check(),
which overrides fhandler_termios::bg_check(). This is called
on read(), write() and select() for console. It is necessary
if cygwin and non-cygwin apps are started simultaneously in
the same process group.
4) Setup for non-cygwin apps is done in spawn.cc via
fhandler_console::setup_console_for_non_cygwin_app().
5) Cleanup for non-cygwin app is done in spawn.cc vid
fhandler_console::cleanup_console_for_non_cygwin_app().
6) Setup for non-cygwin app started by GDB is done in
fhandler_console::set_console_mode_to_native().
7) No explicit cleanup for non-cygwin app started by GDB, because
console mode is automatically reset to tty::cygwin on read()/
write() in GDB thanks to 3).
- This patch commonize the code which processes special keys in pty
and console to improve maintanancibility. As a result, some small
bugs have been fixed.
- The capability changes since Windows 11 have been reflected in
wincap.cc. The capability has_con_broken_tabs is added, which is
false since Windows 11.
- When non-cygwin app is started in console, console mode is set to
tty::native. However, if stdin is redirected, current code does not
set the input mode of the console. In this case, if the app opens
"CONIN$", the console mode will not be appropriate for non-cygwin
app. This patch fixes the issue.
Addresses:
https://github.com/GitCredentialManager/git-credential-manager/issues/576
- Currently, there is no chance to change console mode for non-cygwin
inferior of GDB. With this patch, the console mode is changed to
tty::native in CreateProcess() and ContinueDebugEvent() hooked in
fhandler_console.
- In tty_min::setpgid(), a pointer to fhandler instance is casted to
fhandler_pty_slave and accessed even if terminal is not a pty slave.
This patch fixes the issue.
- Currently, pty discards input only in from_master pipe on signal.
Due to this, if pty is started without pseudo console support and
start a non-cygwin process from cmd.exe, type adhead input is not
discarded on signals such as Ctrl-C. This patch fixes the issue.
- With this patch, the code to wait for completion of forwarding of
output from non-cygwin app is revised so that it can more reliably
detect the completion.
- If the slave process writes a lot of text output, doecho() can
cause deadlock. This is because output_mutex is held in slave::
write() and if WriteFile() is blocked due to pipe full, doecho()
tries to acquire output_mutex and gets into deadlock. With this
patch, the deadlock is prevented on the sacrifice of atomicity
of doecho().
- Previously, non-cygwin app running in pty started without pseudo
console support was suspended by Ctrl-Z rather than sending EOF.
Even worse, suspended app could not be resumed by fg command. With
this patch, Ctrl-Z (EOF for non-cygwin apps) is passed to non-cygwin
app instead of suspending that app. This patch also handles Ctrl-\
(QUIT) and Ctrl-D (EOF) as well.
- Currently, if cat is started from cmd.exe which is started in cygwin
console, Ctrl-C terminates not only cat but also cmd.exe. This also
happens in pty in which pseudo console is disabled. This patch fixes
the issue.
- Currently, ENABLE_INSERT_MODE and ENABLE_QUICK_EDIT_MODE are cleared
if cygwin is started in console. These flags will not be recovered
even when exiting from cygwin. Also note that if ENABLE_EXTENDED_FLAGS
is once unset, then the flag ENABLE_QUICK_EDIT_MODE it's associated
with will no longer be preserved. Unfortunately, we're accidentally
stepping on this in fhandler_console::set_input_mode().
This patch solves this by carrying forward these flags in the place
where it had been ignoring them. Since the previous behaviour of
leaving these flags unset would essentially maintain their existing
state, adding the carry-over of the flags now should not alter console
behaviour.
On second thought, we don't actually need this script.
Express the entire action as sufficiently simple Makefile rule.
Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
- formatting
- use array pointer as argument rather than variable arguments
- syntactical fixes
- add comments
- drop unnecessary recomputation of all section VMAs.
Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
In Makefile.am, add the value of $(V) to the dllfixdbg call.
In dllfixdbg, if V=1, print what the script is doing.
Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
Change dllfixdbg to keep the input DLL intact and just generate
a new DLL matching the debug file. Fix Makefile rule accordingly.
The result is, cygwin0.dll is the original DLL created with full
debug sections and stays that way throughout the build process.
Only new-cygwin1.dll will become the stripped DLL matching with
the file containing the debug sections cygwin1.dbg. This is ok,
because commit ba02fef995 ("Cygwin: Makefile.am: fix DLL build rule")
made new-cygwin1.dll the DLL to be installed.
Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
- If an UNC path is mounted to a drive using SMB3.11, accessing to
the drive fails with error "Too many levels of symbolic links."
This patch fixes the issue.
A single Makefile rule creates three files in three steps, the second
and third one never showing up in dependencies. The next step creating
the link lib only depends on the first of these files. Even if the
second or third step in the DLL build rule fails, the next make
invocation never picks up on this and just goes ahead creating the
link lib.
Fix this by splitting the DLL build rule into three rules, with
every step on the way depending on the previous rule. Also fix up
the names, TEST_DLL_NAME just doesn't cut it.
Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
This reverts commit 0390cc8572.
There's no indication what exact situation this patch was supposed to
solve, and local testing doesn't show any such problems. However, this
patch itself introduced a new problem, as outlined by
https://cygwin.com/pipermail/cygwin/2022-January/250629.html
Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
Commit a2bfe7cae6 introduced a change ignoring default ACEs on files
to come up with a valid POSIX ACL, reflecting the Windows ACEs actually
making sense on files.
However, if CREATOR OWNER or CREATOR GROUP ACEs - both only making sense
as default ACEs - are found in the ACL, a value indicating the presence
of default ACEs gets set, even on files. This in turn breaks a
subsequent integrity check and get_posix_access returns EINVAL.
The code path handling default ACEs on directories sets this indicator
anyway, so don't set it just because one of the above SIDs are found.
Fixes: a2bfe7cae6 ("Cygwin: ACLs: ignore *_INHERIT flags in file ACLs")
Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
In case when the native OS resolver is used (via os_query) the returned
response ID is always 0. It should actually match the ID passed in to
res_send() in the DNS request header. This patch fixes that
- Make sure the answer buffer is properly cleared so there is no trailing
garbage when the response does not fit entirely in;
- Make sure an internal decomp failure gets reported correctly (w/return code -1);
- Make sure that the buffer is not overrun when filling out the header.
When trying to create a directory called `xyz` in the presence of a
directory `xyz.lnk`, the Cygwin runtime errors out with an `ENOENT`.
The root cause is actually a bit deeper: the `symlink_info::check()`
method tries to figure out whether the given path refers to a symbolic
link as emulated via `.lnk` files, but since it is a directory, that is
not the case, and that hypothesis is rejected.
However, the `fileattr` field is not cleared, so that a later
`.exists()` call on the instance mistakenly thinks that the symlink
actually exists. Let's clear that field.
This fixes https://github.com/msys2/msys2-runtime/issues/81
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
AAAA records returned from Windows resolver were flagged as "No
structure" in debug output because of being processed (although
correctly) in the default catch-all case. This patch makes the AAAA
records properly recognized.
- If the from_master is closed before cleaning up other pipes, such
as from_slave_nat, the same pty may be allocated and pty master may
try to open the pipe which is not closed yet, and it will fail.
This patch fixes the issue.
- Closing attach_mutex and recreating it causes the race issue
between pty and console codes. With this patch, attach_mutex
is created only once in a process which opens pty, and never
closed in order to avoid this issue.
Addresses:
https://cygwin.com/pipermail/cygwin-developers/2021-December/012548.html
- If master_fwd_thread is terminated by cygthread::terminate_thread(),
the opportunity to release tmp_pathbuf is missed, resulting in a
memory leak. This patch fixes the issue.
- GDB inferior may be suspended while the inferior grabs mutex.
This causes deadlock in terminal I/O. With this patch, timeout
for waiting mutex is set to 0 for the debugger process when the
process calls CreateProcess() with DEBUG_PROCESS flag to avoid
deadlock. This may cause the race issue in GDB, however, there
is no other way than that.
Addresses:
https://cygwin.com/pipermail/cygwin-developers/2021-December/012542.html
32 bit Cygwin still exports function calls to support old applications.
E. g., when switching from 16 to 32 bit uid/gid values, new function
like getuid32 have been added and the old getuid function still only
provides 16 bit values. Newly built applications using getuid are
actually calling getuid32.
However, this link magic isn't performed inside Cygwin itself, so if
newlib functions call getuid, they actually call the old getuid, not
the new getuid32. This leads to truncated uid/gid values.
https://cygwin.com/pipermail/cygwin/2022-January/250453.html reports
how this leads to problems in posix_spawn.
Fix this temporarily. i686 support will go away soon in Cygwin and the
fix can be dropped.
Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
We need deps to newlib's libc.a and libm.a, otherwise changes
in newlib code don't trigger a rebuild of the Cygwin DLL.
Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
get_posix_access() creates DEF_*_OBJ aclent_t entries from Windows ACEs
with INHERIT flags set, independent of the file type. These flags only
make sense on directory objects, but certain Windows functions don't
check the file type and allow INHERIT ACE flags even on non-directories.
As a fix, make sure to ignore the INHERIT flags on non-directory ACLs
and don't propagate the matching DEF_*_OBJ aclent_t entries to callers.
Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
NtQueryInformationProcess(ProcessHandleInformation) can return
STATUS_SUCCESS with invalid handle data for certain processes
("minimal" processes on Windows 10). This can cause a crash when
there's an attempt to access that data. Fix that by setting
NumberOfHandles to zero before calling NtQueryInformationProcess.
Addresses: https://cygwin.com/pipermail/cygwin-patches/2021q4/011611.html
- This patch fixes the failure of input switching between io_handle
and io_handle_nat. This very rarely happens, however, input is
wrongly switched to io_handle_nat even though the non-cygwin app
is in the background.
- The recent commit "Cygwin: pty: Add missing input transfer when
switch_to_pcon_in state." causes regression that rlwrap cannot
work with cmd.exe. This patch fixes the issue.
- The recent commit: "Cygwin: pty: Fix Ctrl-C handling for non-cygwin
apps in background." causes the problem that cmd.exe is terminated
by Ctrl-C even if it is running in pseudo console. This patch fixes
the issue.
- With this patch, FILE_SYNCHRONOUS_IO_NONALERT flag is applied to
the read pipe so that native C# programs work with cygwin pipe.
To handle signals in reading pipe with this flag set, the read
pipe itself is always set to nonblocking mode and simulates the
blocking behaviour in raw_read().
- Default to byte mode rather than message mode in order to make
C# programs work with cygwin pipe.
Addresses: https://cygwin.com/pipermail/cygwin/2021-March/247987.html
- With pseudo console enabled, if the non-cygwin app is started in
the background and put it into the foreground, the process cannot
be stopped by Ctrl-C. This patch fixes the issue.
- This patch fixes the bug that input is wrongly sent to io_handle_nat
rather than io_handle when neither read() nor select() is called
after the cygwin app is started from non-cygwin app. This happens
only if psuedo console is disabled.
Addresses:
https://cygwin.com/pipermail/cygwin-patches/2021q4/011587.html
- The last change in path.cc introduced a bug that causes an error
when accessing a virtual drive which mounts UNC path such as
"\\server\share\dir" rather than "\\server\share". This patch
fixes the issue.
Rather than special case status code 0xc00004b3, add status and matching
error code to ntdll.h and handle it as part of the standard error mapping.
Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
To keep getrlimit/setrlimit clean, move the RLIMIT_AS code into
local static functions __set_rlimit_as and __get_rlimit_as.
Also, make adding process to the job the last step, to be able to
close and release the job resources if anything failed. Add matching
comment.
Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
If the incoming soft limit is less restrictive than the current
hard limit, bail out with EPERM. Given the previous sanity check,
this implies trying to raise the hard limit. While, theoretically,
this should be allowed for privileged processes, Windows has no
matching concept in terms of job limits
Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
Code based on the idea implemented by the oneTBB project,
see https://github.com/oneapi-src/oneTBB
Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
NtReadFile can return STATUS_PENDING occasionally even in non-blocking
mode. Check for this and wait for NtReadFile to complete. To avoid
code repetition, do this in a static helper function nt_read.
https://cygwin.com/pipermail/cygwin/2021-November/249930.html
reported a regression introduce by using a dynamically sized local
char array in favor of a statically sized array.
Fix this by reverting to a statically sized array, using a small
buffer on the stack for a reasonable number of requested digits, a
big mallocated buffer otherwise. This should work for small targets
as well, given that malloc is used in printf anyway right now.
This is *still* hopefully just a temporary measure, unless somebody
actually provides a new ldtoa.
Fixes: 4d90e53359 ("ldtoa: fix dropping too many digits from output")
Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
raise(2) on Linux returns the same values and sets errno
independent of calling kill(2) or pthread_kill(3). Align
code to behave the same.
Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
The check for the pthread self pointer in TLS is misleading,
given the main thread has this pointer initialized as well.
Check for the global __isthreaded flag as well.
Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
- This patch fixes the issue that process sometimes hangs for 60
seconds with the following scenario.
1) Open command prompt.
2) Run "c:\cygwin64\bin\bash -l"
3) Compipe the following source with mingw compiler.
/*--- Begin ---*/
#include <stdio.h>
int main() {return getchar();}
/*---- End ----*/
4) Run "tcsh -c ./a.exe"
5) Hit Ctrl-C.
The file attributes after creating a file are not necessarily
identical to the attributes we passed as argument to NtCreateFile.
This results in subsequent operations like fchmod or facl to
set the DOS file attributes to unexpected values.
The fix is to request file attributes from the OS after file creation
and cache those.
Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
When running Cygwin's Bash in the Windows Terminal (see
https://docs.microsoft.com/en-us/windows/terminal/ for details), Cygwin
is receiving keyboard input in the form of UTF-16 characters.
UTF-16 has that awkward challenge that it cannot map the full Unicode
range, and to make up for it, there are the ranges U+D800-U+DBFF and
U+DC00-U+DFFF which are illegal except when they come in a pair encoding
for Unicode characters beyond U+FFFF.
Cygwin does not handle such surrogate pairs correctly at the moment, as
can be seen e.g. when running Cygwin's Bash in the Windows Terminal and
then inserting an emoji (e.g. via Windows + <dot>, which opens an emoji
picker on recent Windows versions): Instead of showing an emoji, this
shows the infamous question mark in a black triangle, i.e. the invalid
Unicode character.
Let's special-case surrogate pairs in this scenario.
This fixes https://github.com/git-for-windows/git/issues/3281
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Use the same name as glibc & gnulib to indicate "newlib itself is
being compiled". This also harmonizes the codebase a bit in that
_LIBC was already used in places instead of _COMPILING_NEWLIB.
Building for bfin-elf, mips-elf, and x86_64-pc-cygwin produces
the same object code.
A recent change in binutils marks the .gnu_debuglink_overlay section
as debug section. When dllfixdbg calls objcopy -g, the section
is removed and the --add-gnu-debuglink option on the same command line
appends the section consequentially at the end of the sections.
This in turn breaks Windows Version info and, potentially, raising
the cygheap size at runtime.
Fix this by adding an explicit --keep-section=.gnu_debuglink_overlay
to the objcopy command line.
Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
isabspath handles a path "X:", without trailing slash or backslash,
as absolute path. This breaks some scenarios with relative paths
starting with "X:". For instance, fstatat will mishandle a call
with valid dirfd and "c:" as path.
The reason is that gen_full_path_at() will check for isabspath("C:")
which returns true. So the path will be used verbatim in fstatat,
rather than being converted to a path "<dirfd-path>/c:".
So, introduce isabspath_strict, which returns true for paths starting
with "X:" only if the next char is actually a slash or backslash.
Use it from gen_full_path_at().
This still fixes only half the problem. The right thing would have been
to disallow using DOS paths in the first place. Unfortunately it's much
too late for that.
Addresses: https://cygwin.com/pipermail/cygwin/2021-November/249837.html
Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
Cygwin always requests FILE_WRITE_ATTRIBUTES permissions when trying to
change DAC information. This can lead to permission problems when
trying to chmod/chown files on Samba shares. Drop requesting
FILE_WRITE_ATTRIBUTES on Samba shares and go with WRITE_DAC/WRITE_OWNER
only.
Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
Also rename release 3.4.0 to 3.3.2. It doesn't make sense to
duplicate the issues fixed in 3.3.x into the 3.4.0 relnotes.
Only patches not backported into 3.3.x belong into 3.4.0.
Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
- Currently, bash occasionally exits by Ctrl-C with the following
scenario.
1) Start bash in the command prompt.
2) Run 'exec bash'.
3) Press Ctrl-C several times.
This patch fixes the issue.
- Currently, read() returns EINTR due to a bug if signal handler
is SIG_DFL and the process is suspended by Ctrl-Z and restarted.
This patch fixes the issue.
i. e. Vista/2008. This drops support for the sr_CS locale.
Regenerate LC_MESSAGES and LC_TIME ERA data from more recent Linux
Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
i. e., Vista/2008.
AllocConsole appears to allow creating a console only on the currently
visible desktop since Windows 7, which broke the simple code opening
the console on an invisible desktop in an invisible window station.
Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
Per https://cygwin.com/pipermail/cygwin-developers/2021-October/012429.html,
we may encounter a crash when starting multiple threads during process
startup (here: fhandler_fifo::fixup_after_{fork,exec}) which in turn
allocate memory via malloc.
The problem is concurrent usage of malloc before the malloc muto has
been initialized.
To fix this issue, convert the muto to a SRWLOCK and make sure it is
statically initalized. Thus, malloc can be called as early as necessary
and malloc_init is only required to check for user space provided malloc.
Note that this requires to implement a __malloc_trylock macro to be
called from fork.
Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
This patch unifies the layout of the clipboard descriptor cygcb_t for
32- and 64-bit Cygwin. It allows correct copy/paste between the two
environments without corruption of user's copied data and without access
violations due to interpreting that data as a size field.
The definitions of CYGWIN_NATIVE and cygcb_t are moved to a new include
file, sys/clipboard.h. The include file is used by fhandler_clipboard.cc
as well as getclip.c and putclip.c in the Cygwin cygutils package.
When copy/pasting between 32- and 64-bit Cygwin environments, both must
be running version 3.3.0 or later for successful operation.
- The commit b531d6b0 introduced temporary_query_hdl() which uses
SystemHandleInformation. With this patch, ProcessHandleInformation
rather than SystemHandleInformation is used if it is available.
This request is faster, however, is only available since Windows 8,
therefore, SystemHandleInformation is used for Windows Vista and 7
as before.
- The commit f79a4611 introduced query_hdl, which is the read pipe
handle kept in the write pipe instance in order to determine if
the pipe is ready to write in select(). This implementation has
a potential risk that the write side fails to detect the closure
of the read side if more than one writer exists and one of them
is a non-cygwin process.
With this patch, the strategy of commit f79a4611 is used only if
the process is running as a service. For a normal process,
instead of keeping query_hdl in the write pipe instance, it is
retrieved temporarily when select() is called. Actually, we
want to use tenporary query_hdl for all processes, however, it
does not work for service processes due to OpenProcess()
failure.
open_setup is called by dtable::init_std_file_from_handle and
fhandler_base::open_with_arch. In both cases, failure of open_setup
is now a fatal error.
Currently this can only happen in the following situation: A Cygwin
process is started by a non-Cygwin process, one of the standard IO
handles is a pipe handle, and Cygwin is unable to create a required
mutex (read_mtx or hdl_cnt_mtx).
- query_hdl and hdl_cnt_mtx are moved from fhandler_pipe_fifo to
fhandler_pipe. Then reader_closed() is changed to virtual and
overridden in fhandler_pipe.
- This patch fixes the race issue in the handle counting to detect
closure of read pipe, which is introduced by commit f79a4611.
A mutex hdl_cnt_mtx is introduced for this issue.
- Currently, the stderr handle is duplicated in close_all_files().
This interferes the handle counting for detecting closure of read
pipe, which is introduced by commit f79a4611. This patch stops
duplicating stderr handle if it is write pipe.
NtQueryInformationFile hangs if it's called on the read side handle of
a pipe while another thread or process is performing a blocking read.
Avoid select potentially hanging by calling NtQueryInformationFile
only on the write side of the pipe and using PeekNamedPipe otherwise.
Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
- In pipe_data_available() in select.cc, PeekNamedPipe() call is
not needed if WriteQuotaAvailable is non-zero because we already
know the write pipe has a space. Therefore, with this patch,
PeekNamedPipe() is called only when WriteQuotaAvailable is zero.
This makes select() on pipe faster a bit.
- Currently, raw_read(), raw_write() and close() release select_sem
unconditionally even if no waiter for select_sem exists. With this
patch, only the minimum number of semaphores required is released.
- Usually WriteQuotaAvailable retrieved by NtQueryInformationFile()
on the write side reflects the space available in the inbound buffer
on the read side. However, if a pipe read is currently pending,
WriteQuotaAvailable on the write side is decremented by the number
of bytes the read side is requesting. So it's possible (even likely)
that WriteQuotaAvailable is 0, even if the inbound buffer on the
read side is not full. This can lead to a deadlock situation:
The reader is waiting for data, but select on the writer side
assumes that no space is available in the read side inbound buffer.
Currently, to avoid this stuation, read() does not request larger
block than pipe size - 1. However, this mechanism does not take
effect if the reader side is non-cygwin app.
The only reliable information is available on the read side, so
fetch info from the read side via the pipe-specific query handle
(query_hdl) introduced.
If the query_hdl (read handle) is kept in write side, writer can
not detect closure of read pipe. Therefore, raw_write() counts
write handle and query_hdl. If they are equal, only the pairs of
write handle and query_hdl are alive. In this case, raw_write()
returns EPIPE and raises SIGPIPE.
- Nonblocking pipes (PIPE_NOWAIT) are not well handled by non-Cygwin
tools, so convert pipe handles to PIPE_WAIT handles when spawning
a non-Cygwin process.
We already fetched the correct SECURITY_ATTRIBUTES at the start of
fhandler_pipe::create, so using another SECURITY_ATTRIBUTES object for
the mutex and semaphore objects doesn't make much sense.
Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
select_sem gets created on the read side with inheritence settings
depending on the O_CLOEXEC flag. Then it gets duplicated to the write
side with unconditional inheritence. Fix that.
Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
Fold all code branches potentially having read or written data into
a single if branch, so signalling select_sem catches all cases.
Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
Rename fhandler_pipe_and_fifo::max_atomic_write to pipe_buf_size.
This reflect its actual meaning better. The fhandler_pipe_and_fifo
constructor initializes it to DEFAULT_PIPEBUFSIZE (== 64K), which is
the buffer size for the windows pipes created by fhandler_pipe and
fhandler_fifo. But if we inherit a stdio pipe handle from a
non-Cygwin process, the buffer size could be different.
To remedy this, add a method fhandler_pipe::set_pipe_buf_size that
queries the OS for the pipe buffer size, and use it in
dtable::init_std_file_from_handle.
Given we return 1 already if WriteQuotaAvailable is > 0, the condition
for tiny pipes is never true. Fix the comments.
Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
In blocking mode, the underlying IO must always be terminated,
one way or the other, to make sure the application knows the exact
state after returning from the IO function. Therefore, always call
CancelIo in blocking mode.
Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
Just cancelling a thread doesn't cancel async IO started by this thread.
Fix this by returning from cygwait and calling CancelIo before canceling
self.
Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
- By guarding read with read_mtx, no more than one ReadFile can
be called simultaneously. So couting read handles is no longer
necessary.
- Make raw_read code as similar as possible to raw_write code.
This is a parent of fhandler_pipe and fhandler_fifo for code that is
common between the two classes. Currently it just contains
max_atomic_write and raw_write(). The latter is identical to what
used to be fhandler_pipe::raw_write().
FILE_PIPE_LOCAL_INFORMATION::WriteQuotaAvailable is unreliable.
Usually WriteQuotaAvailable on the write side reflects the space
available in the inbound buffer on the read side. However, if a
pipe read is currently pending, WriteQuotaAvailable on the write side
is decremented by the number of bytes the read side is requesting.
So it's possible (even likely) that WriteQuotaAvailable is 0, even
if the inbound buffer on the read side is not full. This can lead to
a deadlock situation: The reader is waiting for data, but select
on the writer side assumes that no space is available in the read
side inbound buffer.
This patch implements a workaround by never trying to read more than
half the buffer size blocking if the read buffer is empty. This first
cut tries to take the number of open readers into account by reducing
the amount of requested bytes accordingly.
Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
POSIX requires atomicity for non-blocking writes <= PIPE_BUF bytes
and writing of at least 1 byte if any buffer space is left.
Windows NtWriteFile returns STATUS_SUCCESS and "0 bytes written"
if the write doesn't match buffer space. Fix this discrepancy.
Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
The buffer pointer is incremented by "chunk", which is what we
typically try to write, but this isn't what actually got written.
Increment the buffer pointer by what we actually wrote, as returned
by NtWriteFile.
Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
get_obj_handle_count() is used in flock only so far, but pipe
handling might have a usage, too, soon. Given that this function
might be generally useful and isn't restricted to flock usage,
move it to miscfuncs.cc and make it non-static. Add a prototype
in miscfuncs.h.
Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
I wasted valuable minutes of my life just to find out why we export
this weird version of pipe. In the pre-2000 era the idea was Cygwin
could be used as drop-in replacement for msvcrt.dll, apparently.
Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
The read handles of pipes created by CreateNamedPipe don't have
FILE_WRITE_ATTRIBUTES access unless the pipe is created with
PIPE_ACCESS_DUPLEX. This causes set_pipe_non_blocking to fail on such
handles. To fix this, add a helper function nt_create, which uses
NtCreateNamedPipeFile instead of CreateNamedPipe and gives us more
flexibility in setting access rights.
Use this helper function in fhandler_pipe::create (fhandler_pipe *[2],
unsigned, int), which is the version of fhandler_pipe::create used by
the pipe and pipe2 system calls.
For convenience, also add a static member function
fhandler_pipe::npfs_handle similar to those used by fhandler_fifo and
fhandler_socket_unix.
Add methods 'set_pipe_non_blocking' and 'fcntl' to keep the blocking
mode of the Windows pipe in sync with that of the fhandler_pipe
object. This applies to pipes created with the 'pipe' and 'pipe2'
system calls.
Previously fhandler_pipe was derived from fhandler_base_overlapped,
which we are going to remove in a future commit. Make minimal changes
so that the build still succeeds.
In https://cygwin.com/pipermail/cygwin/2021-September/249361.html
Brian pointed out that initializing the structure would be more
future proof, should the developers at Microsoft ever decide to
split the Reserved field and use some bits of the struct for
other purposes.
Fixes: 3d322ac930 ("Cygwin: fix initializing MEM_EXTENDED_PARAMETER")
Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
MEM_EXTENDED_PARAMETER consists of a 64 bit bitfield which contains
the Type and the Reserved members. The former usage of designated
initializer lists initialized Type, but not Reserved. Since that's
not possible anymore due to a g++ 11.2 bug, Cygwin initializes the
MEM_EXTENDED_PARAMETER structs explicitely. This results in a
random value in Reserved, which at least VirtualAlloc2 chokes on
(ERROR_INVALID_PARAMETER).
Set Reserved explicitely to 0 for a fix.
Fixes: bdb7991db3 ("Cygwin: workaround a g++ 11.2 initialization bug")
Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
The handle is created non-inheritable but gets inheritable when
dup'ing the file descriptor. Fix that.
Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
Modern gcc's generate additional DWARF 5 debug sections, which were
still missing in our Cygwin loader script. With ld from binutils 2.37,
this results in diagnostic output when linking the Cygwin DLL...
ld: cygwin0.dll:/4: section below image base
ld: cygwin0.dll:/20: section below image base
ld: cygwin0.dll:/36: section below image base
...and the section addresses given to these sections (.debug_loclists,
.debug_rnglists, debug_line_str) will be wrong.
Fix this by adding the missing DWARF 5 sections to our linker script
template cygwin.sc.in. Add a comment in terms of the deprecated
DWARF 4 section .debug_types.
Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
Signed-off-by: Jon Turney <jon.turney@dronecode.org.uk>
This was used before switching to automake to allow easy tweaking
of optimization and debugging settings from the command line during
testing. Reenable.
Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
trying to use aggregate initialization syntax on a member of a
nameless union member failes in g++ 11.2.
Workaround this by using explicit initialization.
Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
The register keyword was already deprecated with C++11, but
with C++17 it has been entirely removed.
Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
Revert mx parameter and mutex lock while operating the list.
Mutex was removed with 94d24160 informing that:
'Use InterlockedCompareExchangePointer to ensure race safeness
without using a mutex.'
But it does not.
Calling pthread_mutex_init and pthread_mutex_destroy from two or
more threads occasionally leads to hang in pthread_mutex_destroy.
To not change the behaviour of other cases where List_insert was called,
List_insert_nolock is added.
As outlined in the previous patch, the non-atomicity of iterating
over a directory in the NT namespace via NtQueryDirectoryObject
one entry each, results in potential duplication of directory entries.
Fix this for fhandler_procsys::readdir as well by fetching the entire
dir inside fhandler_procsys::opendir, storing it in a buffer, and just
return buffer content from fhandler_procsys::readdir.
Fixes: 43f65cdd7d ("fhandler_procsys.cc: New file.")
Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
Due to reports on the Cygwin mailing list[1][2], it was uncovered
that a NtOpenDirectoryObject/NtQueryDirectoryObject/NtClose sequence
with NtQueryDirectoryObject iterating over the directory entries,
one entry per invocation, is not running atomically. If new entries
are inserted into the queried directory, other entries may be moved
around and then accidentally show up twice while iterating.
Change (almost) all NtQueryDirectoryObject invocations so that it gets
a really big buffer (64K) and ideally fetches all entries at once.
This appears to work atomically.
"Almost" all, because fhandler_procsys::readdir can't be easily changed.
[1] https://cygwin.com/pipermail/cygwin/2021-July/248998.html
[2] https://cygwin.com/pipermail/cygwin/2021-August/249124.html
Fixes: e9c8cb3193 ("(format_proc_partitions): Revamp loop over existing harddisks by scanning the NT native \Device object directory and looking for Harddisk entries.")
Fixes: a998dd7055 ("Implement advisory file locking.")
Fixes: 3b7cd74bfd ("(winpids::enum_processes): Fetch Cygwin processes from listing of shared cygwin object dir in the native NT namespace.")
Fixes: 0d6f2b0117 ("syscalls.cc (sync_worker): Rewrite using native NT functions.")
Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
Commit 3434d35a64 fixed a problem when
accessing block devices via their /proc/sys/Device entries. This
changed the way stat info is generated for these devices, resulting
in identical inode numbers for all block devices under /proc/sys/Device.
This patch fixes that by faking a device number for these devices, just as
before.
Fixes: 3434d35a64 ("Cygwin: Fix access to block devices below /proc/sys.")
Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
If a service is supported as TCP and UDP service, GetAddrInfo does not
return two entries, one for TCP, one for UDP, as on Linux. Rather, it
just returns a single entry with ai_socktype and ai_protocol set to 0.
If the service only exists as TCP or UDP service, then ai->ai_socktype
is set, but ai_protocol isn't.
Fortunately we copy over the result from Windows into local storage
anyway, so this patch adds code to fix up the fields neglected by
Windows. In case ai_socktype as well as ai_protocol are 0, duplicate
the entry with valid values for ai_socktype and ai_protocol.
Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
If an interface is disconnected, net.cc:get_ifs tries to fetch IPv4
addresses from the registry. If it fails, it currently returns
pointers to sockaddr structs with zero address. Return a NULL pointer
instead, to signal the caller of getifaddrs that we do not have a
valid struct sockaddr.
Partially addresses: https://cygwin.com/pipermail/cygwin/2021-July/248970.html
Corinna Vinschen
Takashi Yano
Jon Turney
Matt Joyce
Ken Brown
Sebastian Huber
Brian Inglis
Mark Geisert
Mike Frysinger
Johannes Schindelin
Mitchell Hentges
Anton Lavrentiev via Cygwin-patches
Aleksand Malikov