Previously, glibc would pick an arbitrary tmpfs file system from
/proc/mounts if /dev/shm was not available. This could lead to
an unsuitable file system being picked for the backing storage for
shm_open, sem_open, and related functions.
This patch introduces a new function, __shm_get_name, which builds
the file name under the appropriate (now hard-coded) directory. It is
called from the various shm_* and sem_* function. Unlike the
SHM_GET_NAME macro it replaces, the callers handle the return values
and errno updates. shm-directory.c is moved directly into the posix
subdirectory because it can be implemented directly using POSIX
functionality. It resides in libc because it is needed by both
librt and nptl/htl.
In the sem_open implementation, tmpfname is initialized directly
from a string constant. This happens to remove one alloca call.
Checked on x86_64-linux-gnu.
I used these shell commands:
../glibc/scripts/update-copyrights $PWD/../gnulib/build-aux/update-copyright
(cd ../glibc && git commit -am"[this commit message]")
and then ignored the output, which consisted lines saying "FOO: warning:
copyright statement not found" for each of 6694 files FOO.
I then removed trailing white space from benchtests/bench-pthread-locks.c
and iconvdata/tst-iconv-big5-hkscs-to-2ucs4.c, to work around this
diagnostic from Savannah:
remote: *** pre-commit check failed ...
remote: *** error: lines with trailing whitespace found
remote: error: hook declined to update refs/heads/master
This patch changes shm_open to not act as a cancellation point.
Cancellation is disable at start and reenable in function exit.
It fixes BZ #18243.
Tested on x86_64 and i686.
[BZ #18243]
* rt/Makefile (test): Add tst-shm-cancel.
* rt/tst-shm-cancel.c: New file.
* sysdeps/posix/shm_open.c: Disable asynchronous cancellation.
2001-07-06 Paul Eggert <eggert@twinsun.com>
* manual/argp.texi: Remove ignored LGPL copyright notice; it's
not appropriate for documentation anyway.
* manual/libc-texinfo.sh: "Library General Public License" ->
"Lesser General Public License".
2001-07-06 Andreas Jaeger <aj@suse.de>
* All files under GPL/LGPL version 2: Place under LGPL version
2.1.
so the label is not considered unused.
* sysdeps/mach/hurd/pwrite64.c: New file.
* sysdeps/mach/hurd/pread64.c: New file.
* sysdeps/mach/hurd/pread.c
(__libc_pread): Define this name, with __pread as an alias.
* sysdeps/mach/hurd/pwrite.c
(__libc_pwrite): Define this name, with __pwrite as an alias.
Implement POSIX "shared memory objects" as regular
files residing in the /var/run/shm/ directory.
This works on any system that supports _POSIX_MAPPED_FILES,
to make it also support _POSIX_SHARED_MEMORY_OBJECTS.
* sysdeps/posix/shm_open.c: New file.
* sysdeps/posix/shm_unlink.c: New file.
* sysdeps/mach/hurd/bits/posix_opt.h
(_POSIX_SHARED_MEMORY_OBJECTS): Define it.
* rt/aio_notify.c (__aio_notify_only) [! _POSIX_REALTIME_SIGNALS]:
Use raise instead of __aio_sigqueue.
