support/xunistd.h

   1 /* POSIX-specific extra functions.
   2    Copyright (C) 2016-2018 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    <http://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 <unistd.h>
  28
  29 __BEGIN_DECLS
  30
  31 struct stat64;
  32
  33 pid_t xfork (void);
  34 pid_t xwaitpid (pid_t, int *status, int flags);
  35 void xpipe (int[2]);
  36 void xdup2 (int, int);
  37 int xopen (const char *path, int flags, mode_t);
  38 void xstat (const char *path, struct stat64 *);
  39 void xfstat (int fd, struct stat64 *);
  40 void xmkdir (const char *path, mode_t);
  41 void xchroot (const char *path);
  42 void xunlink (const char *path);
  43 long xsysconf (int name);
  44 long long xlseek (int fd, long long offset, int whence);
  45 void xftruncate (int fd, long long length);
  46
  47 /* Read the link at PATH.  The caller should free the returned string
  48    with free.  */
  49 char *xreadlink (const char *path);
  50
  51 /* Close the file descriptor.  Ignore EINTR errors, but terminate the
  52    process on other errors.  */
  53 void xclose (int);
  54
  55 /* Write the buffer.  Retry on short writes.  */
  56 void xwrite (int, const void *, size_t);
  57
  58 /* Invoke mmap with a zero file offset.  */
  59 void *xmmap (void *addr, size_t length, int prot, int flags, int fd);
  60 void xmprotect (void *addr, size_t length, int prot);
  61 void xmunmap (void *addr, size_t length);
  62
  63 __END_DECLS
  64
  65 #endif /* SUPPORT_XUNISTD_H */