lib/other/flock.c

   1
   2 /* Library routines
   3  *
   4  * Porting to Minix 2.0.0
   5  * Author:      Giovanni Falzoni <gfalzoni@pointest.com>
   6  *
   7  * $Id$
   8  */
   9 #include <sys/types.h>
  10 #include <fcntl.h>
  11 #include <string.h>
  12 #include <errno.h>
  13 #include <unistd.h>
  14
  15 /*
  16  *      Name:           int flock(int fd, int mode);
  17  *      Function:       Implements the flock function in Minix.
  18  */
  19 int flock(int fd, int mode)
  20 {
  21   struct flock lck;
  22   register int retcode;
  23
  24   memset((void *) &lck, 0, sizeof(struct flock));
  25   lck.l_type = mode & ~LOCK_NB;
  26   lck.l_pid = getpid();
  27   if ((retcode = fcntl(fd, mode & LOCK_NB ? F_SETLK : F_SETLKW, &lck)) < 0 && errno == EAGAIN)
  28         errno = EWOULDBLOCK;
  29   return retcode;
  30 }
  31
  32 /** flock.c **/