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#include "lock.h"
#include <fcntl.h>
#include <sys/file.h>
#include <sys/types.h>
#include <unistd.h>
/**
@file lock.c
@author djb
@source qmail
@brief locking of resources
*/
#ifdef HASFLOCK
int lock_ex(int fd)
{
return flock(fd, LOCK_EX);
}
int lock_exnb(int fd)
{
return flock(fd, LOCK_EX | LOCK_NB);
}
int lock_un(int fd)
{
return flock(fd, LOCK_UN);
}
#else
int lock_ex(int fd)
{
return lockf(fd, 1, 0);
}
int lock_exnb(int fd)
{
return lockf(fd, 2, 0);
}
int lock_un(int fd)
{
return lockf(fd, 0, 0);
}
#endif
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