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 #ifdef __weak_alias
  18 __weak_alias(flock, _flock)
  19 #endif
  20
  21 /*
  22  *      Name:           int flock(int fd, int mode);
  23  *      Function:       Implements the flock function in Minix.
  24  */
  25 int flock(int fd, int mode)
  26 {
  27   struct flock lck;
  28   register int retcode;
  29
  30   memset((void *) &lck, 0, sizeof(struct flock));
  31   lck.l_type = mode & ~LOCK_NB;
  32   lck.l_pid = getpid();
  33   if ((retcode = fcntl(fd, mode & LOCK_NB ? F_SETLK : F_SETLKW, &lck)) < 0 && errno == EAGAIN)
  34         errno = EWOULDBLOCK;
  35   return retcode;
  36 }
  37
  38 /** flock.c **/