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|
#include <stdio.h>
#include <stdlib.h>
#include "semlib.h"
#include "semaphore.h"
#include "info_proc_user.h"
#include <sys/ipc.h>
#include <sys/shm.h>
#include <sys/sem.h>
#include <sys/types.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <sys/wait.h>
#include <signal.h>
int msgid_q;
int errno;
int id_shm_question;
int id_shm_reponse_client;
void handler(int numero) {
switch(numero) {
case SIGINT:
if (shmctl(id_shm_question, 0, IPC_RMID) == -1) {
perror("shmctl");
}
if (shmctl(id_shm_reponse_client, 0, IPC_RMID) == -1) {
perror("shmctl");
}
if ((semctl(msgid_q, 0, IPC_RMID) == -1) && errno != EIDRM) {
perror("semc");
}
exit(0);
break;
default :
;
}
}
int main() {
//pb pour compiler avec sigaction et std=c99
struct sigaction action_SIGINT,old_action_SIGINT;
action_SIGINT.sa_handler = handler;
action_SIGINT.sa_flags = 0;
struct sigaction action_SIGCHLD,old_action_SIGCHLD;
action_SIGCHLD.sa_handler = SIG_DFL;
action_SIGCHLD.sa_flags = SA_NOCLDWAIT; //j'indique que les fils ne doit pas se transformer en zombie
//mise au vide de mask
if (sigemptyset(&action_SIGCHLD.sa_mask) == -1) {
perror("sigempty");
exit(1);
}
//nouveaux comportement du processus face à SIGCHLD et SIGINT
if (sigaction (SIGCHLD, &action_SIGCHLD, &old_action_SIGCHLD) == -1) {
perror("SIGCHLD");
exit(2);
}
if (sigaction(SIGINT, &action_SIGINT,&old_action_SIGINT) == -1) {
perror("SIGINT");
exit(2);
}
/** creation ensemble semaphore question **/
key_t cle_Semaphore = ftok("/etc", 'a');
int id_semaphore = semget(cle_Semaphore, 3, IPC_CREAT | 0666);
if (id_semaphore == -1) {
perror("semget creation question serveur");
exit(EXIT_FAILURE);
}
/* initialisation du semaphore QUESTION */
if (semctl(id_semaphore, QUESTION, SETVAL, 0) == -1) {
perror("smctl sem question");
exit(EXIT_FAILURE);
}
/* initialisation du semaphore REPONSE */
if (semctl(id_semaphore, REPONSE, SETVAL, 0) == -1) {
perror("smctl sem reponse");
exit(EXIT_FAILURE);
}
/* initialisation du semaphore TICKET */
if (semctl(id_semaphore, TICKET, SETVAL, 1) == -1) {
perror("smctl sem ticket");
exit(EXIT_FAILURE);
}
//création clé pour le shm des questions
key_t cle_shm_question;
cle_shm_question = ftok("/etc",'a');
if (cle_shm_question == -1) {
perror("erreur création cle_shm_question");
exit(1);
}
//création de shm de question
id_shm_question = shmget(cle_shm_question, sizeof(struct question), IPC_CREAT|0666);
if (id_shm_question == -1) {
perror("problème création shm question");
exit(1);
}
//adressage de shm question
struct question* shm_quest = (struct question*) shmat(id_shm_question,NULL,0);
if (shm_quest == (void *) -1) {
perror("adressage de shm question");
exit(1);
}
//traitement des requêtes
char reponse[TAILLE_MESSAGE];
char* t;
struct question quest;
uid_t user_id;
pid_t pid_id;
while(1) {
P(id_semaphore, QUESTION);
quest = *shm_quest;
switch (fork()) {
case -1:
perror("fork");
exit(1);
case 0:
switch(quest.typequestion) {
case 1:
user_id = quest.uid;
t = info_user(user_id);
break;
case 2:
pid_id = quest.pid;
t = info_proc(pid_id);
break;
default:
perror("erreur type");
exit(1);
}
strcpy(reponse, t);
//ouverture de shm réponse client
key_t cle_shm_reponse_client;
cle_shm_reponse_client = ftok("/etc", quest.mypid);
id_shm_reponse_client = shmget(cle_shm_reponse_client, sizeof(char) * 1024, 0666);
if (id_shm_reponse_client == -1) {
perror("shm reponse client");
exit(1);
}
//adressage de shm reponse client
char *shm_reponse_client = (char *) shmat(id_shm_reponse_client,NULL,0);
if (shm_reponse_client == (void *) -1) {
perror("adressage de shm reponse serveur client");
exit(1);
}
//A SYNCHRONISER
strcpy(shm_reponse_client,reponse);
V(id_semaphore, REPONSE);
exit(0);
default :
continue;
}
}
} |
