Thread: sem_init -> bus error

I have done :

Code:

#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/shm.h>
#include <stdio.h>
#include<time.h>
#include <semaphore.h>
#include <unistd.h>

int main() {

sem_t *sem;

int shmid = shmget(4,3 * sizeof(sem_t),(IPC_CREAT | 0666));

sem[0] = shmat(shmid,NULL,0);

 /* then i initialise those three semaphores and i get a bus error */


sem_init(&sem[0][0]),1,1); 
sem_init(&sem[0][1]),1,0); 
sem_init(&sem[0][2]),1,0);

}

Why do i get a bus error when i initialise them?

Thanks, in advance!

sem is just a simple pointer.
in sem_init you access them as it were a 2d-array.
Kurt

Well i replaced sem_t *sem by

sem_t *sem[1] and i get the same error :

Bus error

did this compile for you?

Code:

sem_init(&sem[0][0]),1,1); 
sem_init(&sem[0][1]),1,0); 
sem_init(&sem[0][2]),1,0);

1 open bracket, 2 closing brackets for each of those

did this compile for you?


Code:
sem_init(&sem[0][0]),1,1);
sem_init(&sem[0][1]),1,0);
sem_init(&sem[0][2]),1,0);
1 open bracket, 2 closing brackets for each of those

Well, i made a mistake while copying the file here.

Finally, my shmget had a problem with the specific key 4, i changed it and there is no bus error!