Thanks a lot Andrew,
I read that paragraph thousand of times. However it is not an answer why
it works if a line is commented or not. I cannot figure an acceptable
explanation, that's why I thought it will be a gcc question.
On 22-06-2010 9:23, Andrew Bell wrote:
On Tue, Jun 22, 2010 at 8:16 AM, Sergio Sobarzo<ssobarzo@xxxxxxxxx> wrote:
Hi,
I'm writing an application using semaphores. Here is a simple code
recreating the problem:
***********************************************
#include<sys/types.h>
#include<stdio.h>
#include<semaphore.h>
#include<sys/types.h>
#include<sys/stat.h>
#include<fcntl.h>
#include<stdlib.h>
int main()
{
int ok;
//key_t t;
char *shm,*s;
sem_t *mutex;
mutex = sem_open("/vik",O_CREAT|O_EXCL);
if(mutex == SEM_FAILED)
{
perror("unable to create semaphore");
sem_unlink("vik");
exit(-1);
}
sem_close(mutex);
sem_unlink("vik");
exit(0);
}
************************************************
The man page for sem_open says that if you include O_CREAT as a flag
you must also provide the mode and value arguments. Have you tried
that?
P.S. - This isn't a gcc issue - you should probably post this to a
general UNIX programming list.
Best,
