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Fix third test program. Fix EAGAIN message.

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This commit is contained in:
Enrico Fraccaroli (Galfurian)
2023-05-23 14:05:41 -04:00
parent 3ae9258347
commit 1acec3e7b3
8 changed files with 101 additions and 37 deletions
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programs/tests/t_semflg.c
+93 -31
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@@ -13,45 +13,107 @@
int main(int argc, char *argv[])
{
struct sembuf op[2];
struct sembuf op[1];
union semun arg;
long ret, id;
// Create the first semaphore.
id = semget(IPC_PRIVATE, 1, IPC_CREAT | IPC_EXCL | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
printf("Id: %d\n", id);
// Set the value of the semaphore in the structure.
arg.val = 0;
// Setting the semaphore value.
printf("Set Value (%d): %d\n", id, arg.val);
ret = semctl(id, 0, SETVAL, &arg);
if (ret == -1) {
perror("Failed to set value of semaphore.");
return 1;
}
long ret, semid;
op[0].sem_num = 0;
op[0].sem_op = 1;
op[0].sem_op = -2;
op[0].sem_flg = IPC_NOWAIT;
op[1].sem_num = 0;
op[1].sem_op = -2;
op[1].sem_flg = IPC_NOWAIT;
// Check the value of the semaphore.
ret = semctl(id, 0, GETVAL, &arg);
printf("Check Value before(%d): %d\n", id, ret);
sleep(1);
if ((ret = semop(id, op, 2)) == -1) {
perror("Failed to perform semop");
// ========================================================================
// Create the first semaphore.
semid = semget(IPC_PRIVATE, 1, IPC_CREAT | IPC_EXCL | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
if (semid < 0) {
perror("Failed to create semaphore set");
return 1;
}
printf("[father] Created semaphore set (semid : %d)\n", semid);
// Check the value of the semaphore.
ret = semctl(id, 0, GETVAL, &arg);
printf("Check Value after(%d): %d\n", id, ret);
// ========================================================================
// Set the value of the semaphore in the structure.
arg.val = 1;
// Setting the semaphore value.
ret = semctl(semid, 0, SETVAL, &arg);
if (ret < 0) {
perror("Failed to set value of semaphore");
return 1;
}
printf("[father] Set semaphore value (id : %d, value : %d == 1)\n", semid, arg.val);
// ========================================================================
// Check if we successfully set the value of the semaphore.
ret = semctl(semid, 0, GETVAL, NULL);
if (ret < 0) {
perror("Failed to get the value of semaphore set");
return 1;
}
printf("[father] Get semaphore value (id : %d, value : %d == 1)\n", semid, ret);
// ========================================================================
// Create child process.
if (!fork()) {
struct sembuf op_child;
// Initialize the operation structure.
op_child.sem_num = 0; // Operate on semaphore 0.
op_child.sem_op = 1; // Increment value by 1.
op_child.sem_flg = 0; // No flags.
sleep(3);
// ====================================================================
// Increment semaphore value.
if (semop(semid, &op_child, 1) < 0) {
perror("Failed to perform first child operation");
return 1;
}
printf("[child] Succesfully performed opeation (id : %d)\n", semid);
// ====================================================================
// Check if we successfully set the value of the semaphore.
ret = semctl(semid, 0, GETVAL, NULL);
if (ret < 0) {
perror("Failed to get the value of semaphore set");
return 1;
}
printf("[child] Get semaphore value (id : %d, value : %d == 1)\n", semid, ret);
printf("[child] Exit, now.\n", semid, ret);
// ========================================================================
// Delete the semaphore set.
ret = semctl(semid, 0, IPC_RMID, 0);
if (ret < 0) {
perror("Failed to remove semaphore set");
}
printf("[child] Correctly removed semaphore set.\n");
return 0;
}
// ========================================================================
// Perform the operations.
if (semop(semid, op, 2) < 0) {
perror("Failed to perform operation");
return 1;
}
printf("[father] Performed semaphore operations (id : %d)\n", semid);
// ========================================================================
// Check if we successfully set the value of the semaphore.
ret = semctl(semid, 0, GETVAL, NULL);
if (ret < 0) {
perror("Failed to get the value of semaphore set");
return 1;
}
printf("[father] Get semaphore value (id : %d, value : %d == 1)\n", semid, ret);
// ========================================================================
// Delete the semaphore set.
ret = semctl(semid, 0, IPC_RMID, 0);
if (ret < 0) {
perror("Failed to remove semaphore set");
}
printf("[father] Correctly removed semaphore set.\n");
return 0;
}