mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-23 17:53:37 +08:00
e9fed2438a
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.
43 lines
1.3 KiB
C
43 lines
1.3 KiB
C
/* Copyright (C) 2002-2021 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, see
|
|
<https://www.gnu.org/licenses/>. */
|
|
|
|
#include <errno.h>
|
|
#include <semaphore.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
#include "semaphoreP.h"
|
|
#include <shm-directory.h>
|
|
|
|
int
|
|
sem_unlink (const char *name)
|
|
{
|
|
struct shmdir_name dirname;
|
|
if (__shm_get_name (&dirname, name, true) != 0)
|
|
{
|
|
__set_errno (ENOENT);
|
|
return -1;
|
|
}
|
|
|
|
/* Now try removing it. */
|
|
int ret = unlink (dirname.name);
|
|
if (ret < 0 && errno == EPERM)
|
|
__set_errno (EACCES);
|
|
return ret;
|
|
}
|