Path: utzoo!utgpu!watserv1!ria!uwovax!reggers
From: reggers@uwovax.uwo.ca (Reg Quinton)
Newsgroups: comp.sys.mips
Subject: flock(2) is snafu
Summary: flock doesn't work
Message-ID: <6888.26e7cfc0@uwovax.uwo.ca>
Date: 7 Sep 90 20:50:08 GMT
Lines: 46

I've been trying to get mh running on a Mips/120 here at Western. I'm
building things in a BSD environment, my search path is such that I
hit the bsd43/cc rather than the SYSV version.

Anyways, I've got stuck on the flock call used for file locking. Here's
a very simple program that demonstrates the problem.

----- cut here for test.c -----
#include <stdio.h>
#include <sys/file.h>

#define	FILNAM	".cshrc"
#define	MODE	O_RDONLY
#define	NOTOK	(-1)

main(argc,argv)
int	argc;
char	*argv[];

{
	int	fd;

	if ((fd=open(FILNAM,MODE,0777)) == NOTOK)
	{	perror(FILNAM);	exit(1);	}

	if (flock(fd,LOCK_EX | LOCK_NB) == NOTOK)
	{	perror("lock");	exit(2);	}

	printf("She works!\n");
}
----- cut here for test.c -----

If I "make test" and then "./test" in my home directory (where I have a
.cshrc file) I always get a perror message of this sort:

	lock: Bad file number

Any ideas what I'm doing wrong? Or how I can get this to work?

P.S. the above code works fine on our Suns and Next machines..

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