src/util.h

   1 /* util.h -- header for utility routines for vlock,
   2  *           the VT locking program for linux
   3  *
   4  * This program is copyright (C) 2007 Frank Benkstein, and is free
   5  * software which is freely distributable under the terms of the
   6  * GNU General Public License version 2, included as the file COPYING in this
   7  * distribution.  It is NOT public domain software, and any
   8  * redistribution not permitted by the GNU General Public License is
   9  * expressly forbidden without prior written permission from
  10  * the author.
  11  *
  12  */
  13
  14 #include <stddef.h>
  15
  16 struct timespec;
  17
  18 /* Parse the given string (interpreted as seconds) into a
  19  * timespec.  On error NULL is returned.  The caller is responsible
  20  * to free the result.   The string may be NULL, in which case NULL
  21  * is returned, too. */
  22 struct timespec *parse_seconds(const char *s);
  23
  24 void vlock_invoke_atexit(void);
  25 void vlock_atexit(void (*function)(void));
  26
  27 #define STRERROR (errno ? strerror(errno) : "Unknown error")
  28
  29 #define GUARD_ERRNO(expr) \
  30   do { \
  31     int __errsv = errno; expr; errno = __errsv; \
  32   } while (0)