lib/libc/sys-minix/flock.c

   1 /* Library routines
   2  *
   3  * Porting to Minix 2.0.0
   4  * Author:      Giovanni Falzoni <gfalzoni@pointest.com>
   5  */
   6
   7 #include <sys/cdefs.h>
   8 #include "namespace.h"
   9 #include <lib.h>
  10
  11 #include <sys/types.h>
  12 #include <fcntl.h>
  13 #include <string.h>
  14 #include <errno.h>
  15 #include <unistd.h>
  16
  17 /*
  18  *      Name:           int flock(int fd, int mode);
  19  *      Function:       Implements the flock function in Minix.
  20  */
  21 int flock(int fd, int mode)
  22 {
  23   struct flock lck;
  24   register int retcode;
  25
  26   memset((void *) &lck, 0, sizeof(struct flock));
  27   lck.l_type = mode & ~LOCK_NB;
  28   lck.l_pid = getpid();
  29   if ((retcode = fcntl(fd, mode & LOCK_NB ? F_SETLK : F_SETLKW, &lck)) < 0 && errno == EAGAIN)
  30         errno = EWOULDBLOCK;
  31   return retcode;
  32 }
  33
  34 /** flock.c **/