SCR/SCR3.1/TP4/mytimeout.c

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <signal.h>
#include "helpers.c"
#include "helpers.h"
#define BUF_SIZE 256

void kill_son(int){
	if (waitpid(-1,NULL,WNOHANG)==0)
		kill(0, SIGKILL);
}
int main(int argc, char **argv){
	char* args[argc - 2];
	char path[BUF_SIZE] = "/usr/bin/";
	int secondes = (int) strtod(argv[1], NULL);
	pid_t p;
	if (argc < 3){
		printf("Usage : %s <nbsec> <com> [arg]", argv[0]);
		return EXIT_FAILURE;
	}
	strcat(path, argv[2]);
	for (int i = 2; i < argc; i++)
		args[i - 2] = argv[i];
	p = fork();
	switch(p){
		case 0:
			execv(path, args);
			exit(0);
		case -1:
			exit(EXIT_FAILURE);
		default:
			alarm(secondes);
			set_signal_handler(SIGALRM, &kill_son);
			sleep(secondes);
	}
	exit(0);
}