I just run a example program from the book unp2v2
written W.Richard Stevens. The program includes a call
to sem_open. The compilation was ok. But when I run it
on FreeBSD 5-current(recent),the system print "Bad
system call (core dumped)". The program code :
#include <sys/types.h>
#include <unistd.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <semaphore.h>
#include <stdio.h>
#include <stdlib.h>
#define FILE_MODE (S_IRUSR | S_IWUSR | S_IRGRP |
S_IROTH)
int
main(int argc, char **argv)
{
int c, flags;
sem_t *sem;
unsigned int value;
flags = O_RDWR | O_CREAT;
value = 1;
while ( (c = getopt(argc, argv, "ei:")) != -1) {
switch (c) {
case 'e':
flags |= O_EXCL;
break;
case 'i':
value = atoi(optarg);
break;
}
}
if (optind != argc - 1)
{
printf("usage: semcreate [ -e ] [ -i initalvalue ]
<name>");
exit(1);
}
if((sem = sem_open(argv[optind], flags, FILE_MODE,
value))==SEM_FAILED)
{
perror("semaphore creation failed");
exit(1);
}
sem_close(sem);
exit(0);
}
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