27 lines
598 B
C
27 lines
598 B
C
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/* */
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/* Copyright (c) 1984,1985,1986,1987,1988,1989,1990 AT&T */
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/* All Rights Reserved */
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/* */
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/* THIS IS UNPUBLISHED PROPRIETARY SOURCE CODE OF AT&T. */
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/* The copyright notice above does not evidence any */
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/* actual or intended publication of such source code. */
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/* */
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#include <sys/file.h>
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int main(argc,argv)
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char *argv[];
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{
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register int fd;
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register int r;
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if(( fd = open(argv[1],0)) < 0)
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exit(1);
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if(flock(fd,LOCK_NB|LOCK_EX)!=0)
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exit(2);
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if(( fd = open(argv[1],0)) < 0)
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exit(3);
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r = flock(fd,LOCK_NB|LOCK_EX);
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return(r==0);
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}
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