#include "portable.h"
#include <stdio.h>
#include <ac/unistd.h>
#undef LOCK_API
#if defined(HAVE_LOCKF) && defined(F_LOCK)
# define USE_LOCKF 1
# define LOCK_API "lockf"
#endif
#if !defined(LOCK_API) && defined(HAVE_FCNTL)
# ifdef HAVE_FCNTL_H
# include <fcntl.h>
# endif
# ifdef F_WRLCK
# define USE_FCNTL 1
# define LOCK_API "fcntl"
# endif
#endif
#if !defined(LOCK_API) && defined(HAVE_FLOCK)
# ifdef HAVE_SYS_FILE_H
# include <sys/file.h>
# endif
# define USE_FLOCK 1
# define LOCK_API "flock"
#endif
#if !defined(USE_LOCKF) && !defined(USE_FCNTL) && !defined(USE_FLOCK)
int lutil_lockf ( int fd ) {
fd = fd;
return 0;
}
int lutil_unlockf ( int fd ) {
fd = fd;
return 0;
}
#endif
#ifdef USE_LOCKF
int lutil_lockf ( int fd ) {
return lockf( fd, F_LOCK, 0 );
}
int lutil_unlockf ( int fd ) {
return lockf( fd, F_ULOCK, 0 );
}
#endif
#ifdef USE_FCNTL
int lutil_lockf ( int fd ) {
struct flock file_lock;
memset( &file_lock, '\0', sizeof( file_lock ) );
file_lock.l_type = F_WRLCK;
file_lock.l_whence = SEEK_SET;
file_lock.l_start = 0;
file_lock.l_len = 0;
return( fcntl( fd, F_SETLKW, &file_lock ) );
}
int lutil_unlockf ( int fd ) {
struct flock file_lock;
memset( &file_lock, '\0', sizeof( file_lock ) );
file_lock.l_type = F_UNLCK;
file_lock.l_whence = SEEK_SET;
file_lock.l_start = 0;
file_lock.l_len = 0;
return( fcntl ( fd, F_SETLKW, &file_lock ) );
}
#endif
#ifdef USE_FLOCK
int lutil_lockf ( int fd ) {
return flock( fd, LOCK_EX );
}
int lutil_unlockf ( int fd ) {
return flock( fd, LOCK_UN );
}
#endif