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flock.c

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/*! \file flock.c
          This file implements file locking facility.
 */

#include "flock.h"

/*! \brief Lock a file.
    \author Denis BEURIVE
    \param fd File descriptor that identifies the file to lock.
    \return If the lock succed, the function returns 0. Otherwise the function returns 1.
 */

int lock_file(int fd)
{
  int cr;

  cr = flock (fd, LOCK_EX);
  if (cr == -1) { return 1; }
  return 0;
}

/*! \brief Unlock a file.
    \author Denis BEURIVE
    \param fd File descriptor that identifies the file to unlock.
    \return If the operation succed, the function returns 0. Otherwise the function returns 1.
 */

int unlock_file(int fd)
{
  int cr;

  cr = flock (fd, LOCK_UN);
  if (cr == -1) { return 1; }
  return 0;
}

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