[4884] in Kerberos
fcntl and file locking
daemon@ATHENA.MIT.EDU (Jim Ertle)
Tue Mar 28 18:29:40 1995
To: kerberos@MIT.EDU
Date: Tue, 28 Mar 1995 20:59:19 GMT
From: ertle@bajoran.emba.uvm.edu (Jim Ertle)
Hi!
I'm trying to compile/run kerberos5 at our site, and I'm having
some difficulty with file locking ( in kinit, which locks with
fcc_maybe/fcc_init ). Extracted from the code, the lock procedure
still doesn't work - it gets an error of EINVAL, which implies an
invalid argument was passed in.
I'm on a Sun4 running SunOS 4.1.3, and the man pages seem to say
that the following should work. It doesn't, of course.
Is there an answer to my dilemma?
/******************** START PROG ***********************/
#include <stdio.h>
#include <sys/types.h>
#include <unistd.h>
#include <fcntl.h>
int main()
{
int fd;
struct flock sf;
sf.l_type = F_WRLCK;
sf.l_whence = 0;
sf.l_start = 0;
sf.l_len = 0;
if (-1 == (fd = open("/tmp/test.ertle",O_CREAT|O_RDWR, 0666)))
{
perror("Opening /tmp/test.ertle ");
exit(2);
}
if (-1 == (fcntl(fd,(int) F_SETLKW,&sf)))
{
perror("Locking /tmp/test.ertle ");
exit(1);
}
unlink("/tmp/test.ertle");
}
/******************** END PROG ***********************/
--
James A. Ertle |If you argue for your faults,
ertle@emba.uvm.edu |sure enough, they're yours.
UVM's EMBA Computer Facility | - Richard Bach
Burlington, Vt. USA |
