Thread: What is wrong with this function?

Ok, i have this function and for some reason the return value is ...........

Code:

sem_t *semn_open(int id){
  return (sem_t*)sem_open("/999", O_CREAT);
}

Obviously this is a simplified version of the function... but it doesn't work anyway!

I'm calling this with:

Code:

sem_t *temp;
// causes segmentation fault
temp = semn_open(999);
// all OK
// temp = sem_open("/999", O_CREAT);

Can anyone help me?

Thanks in advance

OK sorry!

Here is a fully functional code. Surprisingly I noticed that the problem doesn't come from my_sem_open but from sem_open itself (?!)

I don't get any errors but the output is "* test * test * test * test ...."

Code:

#include <stdio.h>
#include <fcntl.h>
#include <semaphore.h>

sem_t *my_sem_open() {
   return sem_open("/100", O_CREAT);
}

int main() {
   sem_unlink("/100");
   sem_t *temp;
   if ((temp = sem_open("/100", O_CREAT)) == (void*)-1) {
      printf("error!!!\n");
      return 0;
   }
   printf("going to wait..\n");
   for (;;) {
      sem_wait(temp);
      printf("* test ");
   }
   return 0;
}

Heh - I get a segfault

OOoops...

Got it! Thanks!