/* Passage de messages sysV IPC  - l'expéditeur sendmsg_sysV.c
est censé fonctionner avec recvmsg_sysV :
démarrage de rcvmesg_sysV en arrière-plan,
puis démarrage de sendmsg_sysV
*/

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/msg.h>
#define BUF 1024


struct my_msg_st {
long int my_msg_type;
char some_text[BUFSIZ];
};
int main() {
int run = 1;
struct my_msg_st some_data;
int msqid;
char buffer[BUF];
msqid = msgget( (key_t)1234, 0666 | IPC_CREAT);
if (msqid == -1) {
perror("msgget in sendmsg_sysV failed");
exit(EXIT_FAILURE);
}
while (run) {
printf("Enter some text:");
fgets(buffer, BUF, stdin);
some_data.my_msg_type = 1;
strcpy(some_data.some_text, buffer);
if (msgsnd(msqid, &amp;some_data, BUF, 0) == -1) {
perror("msgsnd in sendmsg_sysV failed");
exit(EXIT_FAILURE);
}
if (strncmp(buffer, "end", 3) == 0) {
run = 0;
}
}
exit(EXIT_SUCCESS);
}