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https://sourceware.org/git/glibc.git
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20b6b8e8a5
With fortification enabled, read calls return result needs to be checked,
has it gets the __wur macro enabled.
Note on read call removal from sysdeps/pthread/tst-cancel20.c and
sysdeps/pthread/tst-cancel21.c:
It is assumed that this second read call was there to overcome the race
condition between pipe closure and thread cancellation that could happen
in the original code. Since this race condition got fixed by
d0e3ffb7a5 the second call seems
superfluous. Hence, instead of checking for the return value of read, it
looks reasonable to simply remove it.
Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
94 lines
3.1 KiB
C
94 lines
3.1 KiB
C
/* POSIX-specific extra functions.
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Copyright (C) 2016-2023 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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/* These wrapper functions use POSIX types and therefore cannot be
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declared in <support/support.h>. */
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#ifndef SUPPORT_XUNISTD_H
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#define SUPPORT_XUNISTD_H
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#include <sys/cdefs.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <unistd.h>
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__BEGIN_DECLS
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struct stat64;
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pid_t xfork (void);
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pid_t xwaitpid (pid_t, int *status, int flags);
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void xpipe (int[2]);
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void xdup2 (int, int);
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int xopen (const char *path, int flags, mode_t);
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#ifndef __USE_TIME_BITS64
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# ifdef __USE_FILE_OFFSET64
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void xstat (const char *path, struct stat *);
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void xlstat (const char *path, struct stat *);
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void xfstat (int fd, struct stat *);
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# else
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void xstat (const char *path, struct stat64 *);
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void xlstat (const char *path, struct stat64 *);
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void xfstat (int fd, struct stat64 *);
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# endif
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#else
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void __REDIRECT (xstat, (const char *path, struct stat *), xstat_time64);
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void __REDIRECT (xlstat, (const char *path, struct stat *), xlstat_time64);
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void __REDIRECT (xfstat, (int fd, struct stat *), xfstat_time64);
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#endif
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void xmkdir (const char *path, mode_t);
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void xchroot (const char *path);
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void xunlink (const char *path);
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long xsysconf (int name);
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long long xlseek (int fd, long long offset, int whence);
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void xftruncate (int fd, long long length);
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void xsymlink (const char *target, const char *linkpath);
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void xchdir (const char *path);
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void xfchmod (int fd, mode_t mode);
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void xchmod (const char *pathname, mode_t mode);
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void xmkfifo (const char *pathname, mode_t mode);
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/* Equivalent of "mkdir -p". */
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void xmkdirp (const char *, mode_t);
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/* Read the link at PATH. The caller should free the returned string
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with free. */
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char *xreadlink (const char *path);
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/* Close the file descriptor. Ignore EINTR errors, but terminate the
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process on other errors. */
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void xclose (int);
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/* Write the buffer. Retry on short writes. */
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void xwrite (int, const void *, size_t);
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/* Read to buffer. Retry on short reads. */
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void xread (int, void *, size_t);
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/* Invoke mmap with a zero file offset. */
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void *xmmap (void *addr, size_t length, int prot, int flags, int fd);
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void xmprotect (void *addr, size_t length, int prot);
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void xmunmap (void *addr, size_t length);
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ssize_t xcopy_file_range(int fd_in, loff_t *off_in, int fd_out,
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loff_t *off_out, size_t len, unsigned int flags);
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__END_DECLS
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#endif /* SUPPORT_XUNISTD_H */
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