Now that getdtablesize always returns OPEN_MAX_MAX, we can simplify
sysconf(_SC_OPEN_MAX) and getrlimit(RLIMIT_NOFILE) to just use that
same constant instead of calling getdtablesize.
According to the Linux man page for getdtablesize(3), the latter is
supposed to return "the maximum number of files a process can have
open, one more than the largest possible value for a file descriptor."
The constant OPEN_MAX_MAX is the only limit enforced by Cygwin, so we
now return that.
Previously getdtablesize returned the current size of cygheap->fdtab,
Cygwin's internal file descriptor table. But this is a dynamically
growing table, and its current size does not reflect an actual limit
on the number of open files.
With this change, gnulib now reports that getdtablesize and
fcntl(F_DUPFD) work on Cygwin. Packages like GNU tar that use the
corresponding gnulib modules will no longer use gnulib replacements on
Cygwin.
- Currently, thread created by pthread_create() is not suspended by
the signal SIGTSTP. For example, even if a process with a thread
is suspended by Ctrl-Z, the thread continues running. This patch
fixes the issue.
- Currently, read() returns -1 with EINTR if the process is suspended
by Ctrl-Z and resumed by fg command, while pty continues to read.
For example, xxd command stops with error "Interrupted system call"
after Ctrl-Z and fg. This patch aligns the behaviour with pty (and
Linux).
Allow fchmodat with the AT_SYMLINK_NOFOLLOW flag to succeed on
non-symlinks. Previously it always failed, as it does on Linux. But
POSIX permits it to succeed on non-symlinks even if it fails on
symlinks.
The reason for following POSIX rather than Linux is to make gnulib
report that fchmodat works on Cygwin. This improves the efficiency of
packages like GNU tar that use gnulib's fchmodat module. Previously
such packages would use a gnulib replacement for fchmodat on Cygwin.
- After commit bb428520, there has been the disadvantage:
7) Pseudo console cannot be activated if it is already activated for
another process on same pty.
This patch clears this disadvantage.
- After commit bb428520, there has been the disadvantage:
2) The apps which use console API cannot be debugged with gdb. This
is because pseudo console is not activated since gdb uses
CreateProcess() rather than exec(). Even with this limitation,
attaching gdb to native app, in which pseudo console is already
activated, works.
This patch clears this disadvantage.
- After commit bb428520, there has been the disadvantage:
4) Code page cannot be changed by chcp.com. Acctually, chcp works
itself and changes code page of its own pseudo console. However,
since pseudo console is recreated for another process, it cannot
inherit the code page.
This patch clears this disadvantage.
- PTY has a problem that the key input, which is typed during windows
native app is running, disappears when it returns to shell. This is
beacuse pty has two input pipes, one is for cygwin apps and the other
one is for native windows apps. The key input during windows native
program is running is sent to the second input pipe while cygwin
shell reads input from the first input pipe. This issue had been
fixed once by commit 29431fcb, however, the new implementation of
pseudo console support by commit bb428520 could not inherit this
feature. This patch realize transfering input data between these
two pipes bidirectionally by utilizing cygwin-console-helper process.
The helper process is launched prior to starting the non-cygwin app,
however, exits immediately unlike previous implementation.
Change the prototypes to be in line with POSIX/glibc. This may fix
issues with new warnings produced by GCC 11.
Signed-off-by: Sebastian Huber <sebastian.huber@embedded-brains.de>
Following POSIX, ensure that ctime is updated if chown succeeds,
unless the new owner is specified as (uid_t)-1 and the new group is
specified as (gid_t)-1. Previously, ctime was unchanged whenever the
owner and group were both unchanged.
Aside from POSIX compliance, this fix makes gnulib report that chown
works on Cygwin. This improves the efficiency of packages like GNU
tar that use gnulib's chown module. Previously such packages would
use a gnulib replacement for chown on Cygwin.
I think we don't need an extra flag as we can utilize: access & FILE_WRITE_ATTRIBUTES
What do you think?
Ben Wijen (1):
syscalls.cc: unlink_nt: Try FILE_DISPOSITION_IGNORE_READONLY_ATTRIBUTE
winsup/cygwin/ntdll.h | 3 ++-
winsup/cygwin/syscalls.cc | 22 +++++++--------
winsup/cygwin/wincap.cc | 11 ++++++++
winsup/cygwin/wincap.h | 56 ++++++++++++++++++++-------------------
4 files changed, 53 insertions(+), 39 deletions(-)
--
2.30.0
>From 2d0ff6fec10d03c24d11c747852018b7bc1136ac Mon Sep 17 00:00:00 2001
In-Reply-To: <20210122105201.GD810271@calimero.vinschen.de>
References: <20210122105201.GD810271@calimero.vinschen.de>
From: Ben Wijen <ben@wijen.net>
Date: Tue, 17 Dec 2019 15:15:25 +0100
Subject: [PATCH v3 1/8] syscalls.cc: unlink_nt: Try
FILE_DISPOSITION_IGNORE_READONLY_ATTRIBUTE
Implement wincap.has_posix_unlink_semantics_with_ignore_readonly and when set
skip setting/clearing of READONLY attribute and instead use
FILE_DISPOSITION_IGNORE_READONLY_ATTRIBUTE
Move post-dir unlink check from fhandler_disk_file::rmdir to
_unlink_nt_post_dir_check
If a directory is not removed through fhandler_disk_file::rmdir
we can now make sure the post dir check is performed.
- After the commit 72770148, script command exits occasionally with
the error "Bad file descriptor" if it is started in console on Win7
and non-cygwin process is executed. This patch fixes the issue.
- The buffer used in get_console_process_id(), introduced by commit
72770148, is too large and ERROR_NOT_ENOUGH_MEMORY occurs in Win7.
Therefore, the buffer size has been reduced.
The isdev_dev check in rmdir is unclean. Create a virtual method
fhandler_dev::rmdir to handle this transparently.
Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
- cat exits immediately in the following senario.
1) Execute env CYGWIN=disable_pcon script
2) Execute cmd.exe
3) Execute cat in cmd.exe.
This is caused by setting input_available_event for the pipe for
non-cygwin app. This patch fixes the issue.
- The functions pty_master_thread() and pty_master_fwd_thread()
should be static (i.e. should not access class member) because
the instance is deleted if the master is dup()'ed and the first
master is closed. In this case, because the dup()'ed instance
still exists, these master threads are also still alive even
though the instance has been deleted. As a result, accesing
class members in these functions causes accessi violation.
Addresses:
https://cygwin.com/pipermail/cygwin-developers/2021-January/012030.html
- After commit 232fde0e, pty changes console code page when the first
non-cygwin app is executed. If pty is started in real console device,
pty changes the code page of root console. This causes very annoying
result because changing code page changes the font of command prompt
if console is in legacy mode. This patch avoids this by creating a
new invisible console for the first pty started in console device.
The old implementation for __cxa_guard_acquire did not return 1,
therefore dynamic initialization was never performed.
If concurrent-safe dynamic initialisation is ever needed, CXX ABI
must be followed when re-implementing __cxa_guard_acquire (et al.)
- The function close_pseudoconsole() should be static so that it
can be safely called in spawn.cc even after the fhandler_pty_slave
instance has been deleted. That is, there is a problem with the
current code. This patch fixes the issue.
- If application changes the console mode, mode management introduced
by commit 10d8c278 will be corrupted. For example, stdout of jansi
v2.0.1 or later is piped to less, jansi resets the xterm mode flag
ENABLE_VIRTUAL_TERMINA_PROCESSING when jansi is terminated. This
causes garbled output in less because less needs this flag enabled.
This patch fixes the issue.
- The workaround for rlwrap introduced by commit 8199b0cc does not
take effect for rlwrap 0.40 or later. This patch add a workaround
for rlwrap 0.40 or later as well.
This fixes a bug on 32-bit Cygwin that was introduced in commit
84252946, "Cygwin: fstatat, fchownat: support the AT_EMPTY_PATH flag".
Add a comment explaining why fstat should not be called.
Addresses: https://cygwin.com/pipermail/cygwin/2021-January/247399.html
This requires modifying fhandler_pty_master::dup so that it duplicates
handles when it is called with non-zero src_pid on an fhandler that
doesn't yet have an archetype.
Add the POSIX header file <poll.h> which is used by the GCC 11 Ada
runtime support.
Signed-off-by: Sebastian Huber <sebastian.huber@embedded-brains.de>
poll has code that checks whether a socket descriptor has a failed
connect or whether shutdown has been called. This previously worked
only for wsock sockets. Tweak the code so that it applies to all
sockets.
To help with this, add a virtual saw_shutdown_read method to the
fhandler_socket class, and define a version of it for AF_UNIX sockets.
A version for wsock sockets already existed.
Untested.
When duplicating handles in fhandler_pty_slave::dup, there's no need
to use local handles as in fhandler_pty_slave::open. We can just
directly use the accessors get_handle, get_handle_cyg, etc.
Update to Linux next 5.10 cpuinfo flags for Intel SDM 36.7.1 Software
Guard Extensions, and 38.1.4 SGX Launch Control Configuration.
Launch control restricts what software can run with enclave protections,
which helps protect the system from bad enclaves.
- Previous workaround has a problem that screen is distorted if up
arrow key is pressed at the first line after running "rlwrap cmd".
This patch fixes the issue.
