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first implementation semctl, first flags

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Aldegheri Alessandro
2023-04-06 11:23:37 +02:00
parent 7c166e73a3
commit b955065ee1
3 changed files with 128 additions and 21 deletions
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programs/tests/t_semget.c
+23 -6
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@@ -2,23 +2,40 @@
#include "ipc/sem.h"
#include "stdio.h"
#include "ipc/ipc.h"
int main()
{
#include "sys/errno.h"
int main()
{
union semun arg;
arg.val = 150;
//key_t i = ftok("/test1.txt", 5); //checking ftok
long id = semget(2,2,0); //first semaphores
//long id2 = semget(IPC_PRIVATE, 1, IPC_CREAT);
//long id2 = semget(2, 2, IPC_EXCL); //need to return -1 bc already exists
long id2 = semget(2, 2, IPC_EXCL); //need to return -1 bc already exists
//long id3 = semget(2, 2, 0); //need to return 3 (semid of the first)
long id3 = semget(2, 2, 0); //need to return 3 (semid of the first)
//long id4 = semget(100, 2, IPC_CREAT | IPC_EXCL); //need to return 101 (new semaphore)
long value;
long id4 = semget(100, 2, IPC_CREAT | IPC_EXCL); //need to return 101 (new semaphore)
if ((value = semctl(id, 1, SETVAL, arg)) == -1){
printf("%d \n", value);
}else{
printf("getpid: %d\n", value);
}
/*if ((semid = semctl(id, 0, IPC_RMID, 0)) == -1){
printf("%d\n", errno);
}else{
printf("found %d\n", semid);
}*/
//long id2 = semget(IPC_PRIVATE, 2, 0);
//long id3 = semget(IPC_PRIVATE, 2, 0);
printf("id %d id2 %d id3 %d id4 %d\n", id, id2, id3, id4);
//printf("id %d id2 %d id3 %d id4 %d\n", id, id2, id3, id4);
/*if (i == -1){
printf("Error with IPC_KEY\n");
return -1;