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lock.c

/*
 * $Id: lock.c,v 1.1 1999/02/09 14:58:36 lf Exp $
 *
 * Copyright (C) 1997 Lars Fenneberg
 *
 * See the file COPYRIGHT for the respective terms and conditions. 
 * If the file is missing contact me at lf@elemental.net 
 * and I'll send you a copy.
 *
 */

#include "config.h"
#include "includes.h"

#if defined(HAVE_FLOCK)

int do_lock_exclusive(int fd)
{
      return flock(fd, LOCK_EX|LOCK_NB);
}

int do_unlock(int fd)
{
      return flock(fd, LOCK_UN);
}

#elif defined(HAVE_FCNTL)

int do_lock_exclusive(int fd)
{
      flock_t fl;
      int res;
      
      memset((void *)&fl, 0, sizeof(fl));
      
      fl.l_type = F_WRLCK;
      fl.l_whence = fl.l_start = 0;
      fl.l_len = 0; /* 0 means "to end of file" */

      res = fcntl(fd, F_SETLK, &fl);
      
      if ((res == -1) && (errno == EAGAIN))
            errno = EWOULDBLOCK;

      return res;
}

int do_unlock(int fd)
{
      flock_t fl;
      
      memset((void *)&fl, 0, sizeof(fl));
      
      fl.l_type = F_UNLCK;
      fl.l_whence = fl.l_start = 0;
      fl.l_len = 0; /* 0 means "to end of file" */

      return fcntl(fd, F_SETLK, &fl);
}

#else
YOU_LOOSE "need either flock(2) or fcntl(2)"
#endif
      

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