scsh-0.5/scsh/flock1.c

39 lines
941 B
C

/* Scheme48/scsh Unix system interface.
** Routines that require custom C support.
** Copyright (c) 1995 by David Albertz.
*/
/* File locking routines */
#include <sys/types.h>
#include <unistd.h>
#include <fcntl.h>
int set_lock(int fd, int cmd, int type, int whence, int start, int len)
{
struct flock lock;
lock.l_type = type;
lock.l_whence = whence;
lock.l_start = start;
lock.l_len = len;
return(fcntl(fd, cmd, &lock));
}
int get_lock(int fd, int cmd, int type, int whence, int start, int len,
int *rtype, int *rwhence, int *rstart, int *rlen, int *rpid)
{
struct flock lock;
int ret;
lock.l_type = type;
lock.l_whence = whence;
lock.l_start = start;
lock.l_len = len;
ret = fcntl(fd, F_GETLK, &lock);
*rtype = lock.l_type;
*rwhence = lock.l_whence;
*rstart = lock.l_start;
*rlen = lock.l_len;
*rpid = lock.l_pid;
return(ret);
}