This is a followup to a report back in 2011 about essentially the same issue:
https://cygwin.com/ml/cygwin/2011-04/msg00031.html
The same test program in that report demonstrates the issue, but with
kill sending any non-zero signal. To reiterate, the problem here is
POSIX compliance with respect to sending signals to zombie processes.
http://pubs.opengroup.org/onlinepubs/9699919799/functions/kill.html
claims:
Existing implementations vary on the result of a kill() with pid
indicating an inactive process (a terminated process that has not been
waited for by its parent). Some indicate success on such a call
(subject to permission checking), while others give an error of
[ESRCH]. Since the definition of process lifetime in this volume of
POSIX.1-2008 covers inactive processes, the [ESRCH] error as described
is inappropriate in this case. In particular, this means that an
application cannot have a parent process check for termination of a
particular child with kill(). (Usually this is done with the null
signal; this can be done reliably with waitpid().)
In response to the originally issue, this was fixed *specifically* for
the case of kill(pid, 0). But my reading of the above is that kill()
should return 0 in this case regardless of the signal (modulo
permissions, etc.). On Linux, for example, when calling kill with pid
of a zombie process the kernel will happily deliver the signal to the
relevant task_struct; it will just never be acted on since the task
will never run again.
Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
Many wchar.h functions were never properly guarded; these changes should
make the header fully compliant.
Signed-off-by: Yaakov Selkowitz <yselkowi@redhat.com>
strcmp.S contained invalid guard for code that used barrel-shifter optional
instruction - it was checking for !ARC601 instead of whether barrel shifter
is present. While it is true that ARC601 doesn't have barrel shifter, so
does some other ARC EM configurations.
2016-07-21 Anton Kolesov <Anton.Kolesov@synopsys.com>
* libc/machine/arc/strcmp.S: Fix big endian without barrel shifter.
Signed-off-by: Anton Kolesov <Anton.Kolesov@synopsys.com>
Prealloc instruction may not be present in all HS variants. Hence, use
prefetch instead of prealloc.
newlib/
2016-04-26 Claudiu Zissulescu <claziss@synopsys.com>
* libc/machine/arc/memset-archs.S: Use prefetch.
This file was copied verbatim from FreeBSD and is in sync
with the FreeBSD svn version used by rtems-libbsd.
Signed-off-by: Joel Sherrill <joelemail@rtems.org>
Commit d7586cb incorrectly checked only for the new cursor position
beyond the old cursor position to decide if we have to correct for user
scrolling. Since this situation is handled just fine if the cursor is
still visible, only perform the subsequent correction if the cursor is
not in the visible console window.
Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
Commit ba58e5f lowered permission requirements when opening threads
and processes to {PROCESS,THREAD}_QUERY_LIMITED_INFORMATION. However,
when creating the /proc/<PID>/maps file, the call to VirtualQueryEx
requires PROCESS_QUERY_INFORMATION access
Note: It seems PROCESS_QUERY_LIMITED_INFORMATION is sufficient starting
with Windows 8.1, but this is neither documented on MSDN, nor is it a
safe bet. It may have to do with a fixed implementation of the UAC
trust levels. Let's better follow the docs for now.
Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
We must call SetConsoleCursorPosition prior to SetConsoleWindowInfo,
otherwise the scroll bars will not be updated by the OS. Make sure
to scroll the console window by just the right amount to have the
new cursor position one line after the used console buffer area at
the top of the console window, no matter the scroll state.
Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
SIGTTIN should be raised when read() is made on a tty in a backgrounded
process, but not when it's tested with poll()/select().
I guess poll()/select() does need to call bg_check(), in order to detect the
error conditions that notices (that is, if bg_check() returns bg_eof or
bg_error, then fd is ready as an error condition exists) so add an optional
parameter to fhandler_base::bg_select() to indicate that signals aren't
desired.
See https://cygwin.com/ml/cygwin-developers/2016-07/msg00004.html
Mingw-w64, which is the source of this code, uses different
definitions of the rounding bits FE_TONEAREST and friends.
They immediately reflect the bit values in the FPU control word,
while on Cygwin they are shifted down to become the values 0-3.
Fix the bit computing expression to account for the difference.
Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
MAXFLOAT, M_PI, and friends date back to at least XPG4v2, so this guard
was incorrect even prior to the feature test macros overhaul.
Signed-off-by: Yaakov Selkowitz <yselkowi@redhat.com>
get_nt_native_path handles the transposition of chars not allowed
in Windows pathnames. However, it never starts transposition at
the start of the string, which is wrong for relative paths. Fix it.
Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
POSIX requires that SSIZE_MAX have the same type as ssize_t, but
on 32-bit, we were defining it as a long even though ssize_t
resolves to an int. It also requires that SSIZE_MAX be usable
via preprocessor #if, so we can't cheat and use a cast.
If this were newlib, I'd have had to hack _intsup.h to probe the
qualities of size_t (via gcc's __SIZE_TYPE__), similar to how we
already probe the qualities of int8_t and friends, then cross our
fingers that ssize_t happens to have the same rank (most systems
do, but POSIX permits a system where they differ such as size_t
being long while ssize_t is int). Unfortunately gcc gives us
neither __SSIZE_TYPE__ nor __SSIZE_MAX__. On the other hand, our
limits.h is specific to cygwin, so we can just shortcut to the
correct results rather than being generic to all possible ABI.
Signed-off-by: Eric Blake <eblake@redhat.com>
Improve the description of Cygwin ldd utility to give a bit more detail
about how it does what it does
Also add a security warning (modelled after the one in the Linux manpage)
that it may end up executing the file it is applied to.
Signed-off-by: Jon Turney <jon.turney@dronecode.org.uk>
Fix an instance of the invalid <pathname> tag in Cygwin utils documentation,
by using the valid <filename> tag instead.
Signed-off-by: Jon Turney <jon.turney@dronecode.org.uk>
In Cygwin utils documentation, use the <example> tag at same level as
<para>, not inside it.
This improves the generated manpages.
Signed-off-by: Jon Turney <jon.turney@dronecode.org.uk>
At fork time the .data and .bss segments of the Cygwin DLL are copied
over to the child process. This also copies the strace timer since
it's in the .bss segment so far. Fix that by moving the strace timer
out into the .data_cygwin_nocopy segment.
Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
The _reent members _current_category and _current_locale are not
used at all. _current_locale is set to "C" in various points of
the code but its value is just as unused as _current_category.
This patch redefines these members without changing the size of the
structure to allow for an implementation of per-thread locales per
POSIX-1.2008 (i.e. uselocale and usage of the per-thread locale in
subsequent function calls).
Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
Add makedocbook, a tool to process makedoc markup and output DocBook XML
refentries.
Process all the source files which are processed with makedoc with
makedocbook as well
Add chapter-texi2docbook, a tool to automatically generate DocBook XML
chapter files from the chapter .texi files. For generating man pages all we
care about is the content of the refentries, so all this needs to do is
convert the @include of the makedoc generated .def files to xi:include of
the makedocbook generated .xml files.
Add skeleton Docbook XML book files, lib[cm].in.xml which include these
generated chapters, which in turn include the generated files containing
refentries, which is processed with xsltproc to generate the lib[cm].xml
Add new make targets to generate and install man pages from lib[cm].xml
set_entry_point_break() uses GetModuleInformation to fetch the
address of the exe's entry point. However, just as with
lpStartAddress from the CREATE_PROCESS_DEBUG_EVENT event, the
returned address is only computed from the PE file header. It's
not actually the entry point in memory, if the executable is
relocated (ASLR). See
https://msdn.microsoft.com/en-us/library/windows/desktop/ms684229(v=vs.85).aspx
Convert this to using the info from CREATE_PROCESS_DEBUG_EVENT
combined with the offset from the PE file header's AddressOfEntryPoint
to deal with relocation.
Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
So far ldd terminates the inferior process as soon as some thread
is started. Apparently threads are started from even ntdll.dll
before the main thread of the application is started. As a result
the dll list is cut short since ldd terminates prematurely.
Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
Commit b1b46d45 introduced a regression. After redefining FIONREAD
as part of restructuring newlib/Cygwin headers, the call to ioctlsocket
in the FIONREAD branch of fhandler_socket::ioctl should have been
changed to use the Winsock definition of FIONREAD, which I neglected.
This only affects 64 bit Cygwin.
Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
In get_mem_values we open the process without PROCESS_VM_READ access
and are *still* able to request working set information, despite
MSDN claiming we need it for this purpose. Instead of adding this
access right, just add an comment to point this out for now.
Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
Using PROCESS/THREAD_QUERY_INFORMATION may limit the number of
processes/threads we can inspect depending on their integrity level.
Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
Yaakov Selkowitz
Erik Bray
Anton Kolesov
Claudiu Zissulescu
Gedare Bloom
Corinna Vinschen
Eric Blake
Ray Donnelly
Jon Turney
Qian Hong
Kuba Sejdak