support/xunistd.h

   1 /* POSIX-specific extra functions.
   2    Copyright (C) 2016-2023 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 /* These wrapper functions use POSIX types and therefore cannot be
  20    declared in <support/support.h>.  */
  21
  22 #ifndef SUPPORT_XUNISTD_H
  23 #define SUPPORT_XUNISTD_H
  24
  25 #include <sys/cdefs.h>
  26 #include <sys/types.h>
  27 #include <sys/stat.h>
  28 #include <unistd.h>
  29
  30 __BEGIN_DECLS
  31
  32 struct stat64;
  33
  34 pid_t xfork (void);
  35 pid_t xwaitpid (pid_t, int *status, int flags);
  36 void xpipe (int[2]);
  37 void xdup2 (int, int);
  38 int xopen (const char *path, int flags, mode_t);
  39 #ifndef __USE_TIME_BITS64
  40 # ifdef __USE_FILE_OFFSET64
  41 void xstat (const char *path, struct stat *);
  42 void xlstat (const char *path, struct stat *);
  43 void xfstat (int fd, struct stat *);
  44 # else
  45 void xstat (const char *path, struct stat64 *);
  46 void xlstat (const char *path, struct stat64 *);
  47 void xfstat (int fd, struct stat64 *);
  48 # endif
  49 #else
  50 void __REDIRECT (xstat, (const char *path, struct stat *), xstat_time64);
  51 void __REDIRECT (xlstat, (const char *path, struct stat *), xlstat_time64);
  52 void __REDIRECT (xfstat, (int fd, struct stat *), xfstat_time64);
  53 #endif
  54 void xmkdir (const char *path, mode_t);
  55 void xchroot (const char *path);
  56 void xunlink (const char *path);
  57 long xsysconf (int name);
  58 long long xlseek (int fd, long long offset, int whence);
  59 void xftruncate (int fd, long long length);
  60 void xsymlink (const char *target, const char *linkpath);
  61 void xchdir (const char *path);
  62 void xfchmod (int fd, mode_t mode);
  63 void xchmod (const char *pathname, mode_t mode);
  64 void xmkfifo (const char *pathname, mode_t mode);
  65
  66 /* Equivalent of "mkdir -p".  */
  67 void xmkdirp (const char *, mode_t);
  68
  69 /* Read the link at PATH.  The caller should free the returned string
  70    with free.  */
  71 char *xreadlink (const char *path);
  72
  73 /* Close the file descriptor.  Ignore EINTR errors, but terminate the
  74    process on other errors.  */
  75 void xclose (int);
  76
  77 /* Write the buffer.  Retry on short writes.  */
  78 void xwrite (int, const void *, size_t);
  79
  80 /* Read to buffer.  Retry on short reads.  */
  81 void xread (int, void *, size_t);
  82
  83 /* Invoke mmap with a zero file offset.  */
  84 void *xmmap (void *addr, size_t length, int prot, int flags, int fd);
  85 void xmprotect (void *addr, size_t length, int prot);
  86 void xmunmap (void *addr, size_t length);
  87
  88 ssize_t xcopy_file_range(int fd_in, loff_t *off_in, int fd_out,
  89                          loff_t *off_out, size_t len, unsigned int flags);
  90
  91 __END_DECLS
  92
  93 #endif /* SUPPORT_XUNISTD_H */