File: semtest.c

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#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/sem.h>
#include <stdio.h>

int main(){
  int sem_id;
  struct sembuf op;
  union semun sem_dummy;
  int val;

  sem_id=semget(63723,1,IPC_CREAT|0600);
  printf("Semid=%i\n",sem_id);
  if(sem_id==-1)
    perror("semtest");
  sem_dummy.val=1;
  val=semctl (sem_id,0,SETVAL,sem_dummy);
  val=semctl (sem_id,0,GETVAL,sem_dummy);
  if(val==-1)
    perror("semtest");
  else
    printf("SemVal?=%i\n",val);
  printf("Now about to semup\n");
  op.sem_num=0;
  op.sem_op=-1;
  op.sem_flg=SEM_UNDO;
  semop(sem_id,&op,1);
  semop(sem_id,&op,1);
  return 0;
}