5be5d85e
 Vincent Benoist
tp processus
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#include <stdio.h>
#include <stdlib.h>
#include <sys/wait.h>
#include <unistd.h>
int main(){
int fork1, fork2, fork3;
if((fork1=fork())<0){
perror("erreur exec du fork");
exit(1);
}
if(fork1 == 0){
if(execlp("who","who",NULL)==-1){
perror("echec execlp");
exit(1);
}
}else{
int pid, r;
if((pid= wait(&r)) <0){
perror("erreur exec du wait");
exit(1);
}
if((fork2=fork())<0){
perror("erreur exec du fork");
exit(1);
}
if(fork2 == 0){
if(execlp("ps","ps","-x",NULL)==-1){
perror("echec execlp");
exit(1);
}
}else{
if((pid= wait(&r)) <0){
perror("erreur exec du wait");
exit(1);
}
if((fork3=fork())<0){
perror("erreur exec du fork");
exit(1);
}
if(fork3 == 0){
if(execlp("ls","ls","-la",NULL)==-1){
perror("echec execlp");
exit(1);
}
}else{
if((pid= wait(&r)) <0){
perror("erreur exec du wait");
exit(1);
}
}
}
}
return 0;
}
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