42 lines
1021 B
C
42 lines
1021 B
C
/* Scheme48/scsh Unix system interface.
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** Routines that require custom C support.
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** Copyright (c) 1995 by David Albertz.
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*/
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/* File locking routines */
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#include <sys/types.h>
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#include <unistd.h>
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#include <fcntl.h>
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/* Make sure our exports match up w/the implementation: */
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#include "flock1.h"
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int set_lock(int fd, int cmd, int type, int whence, int start, int len)
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{
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struct flock lock;
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lock.l_type = type;
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lock.l_whence = whence;
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lock.l_start = start;
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lock.l_len = len;
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return(fcntl(fd, cmd, &lock));
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}
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int get_lock(int fd, int cmd, int type, int whence, int start, int len,
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int *rtype, int *rwhence, int *rstart, int *rlen, int *rpid)
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{
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struct flock lock;
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int ret;
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lock.l_type = type;
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lock.l_whence = whence;
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lock.l_start = start;
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lock.l_len = len;
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ret = fcntl(fd, F_GETLK, &lock);
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*rtype = lock.l_type;
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*rwhence = lock.l_whence;
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*rstart = lock.l_start;
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*rlen = lock.l_len;
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*rpid = lock.l_pid;
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return(ret);
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}
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