son truc

showily.c

#include <stdio.h>
#include <stdlib.h>
#include <errno.h>

#define panic(s) \
{ \
	perror(s); \
	exit(-1); \
}

void usage()
{
	fprintf(stderr, "usage:\n"
			"\t./%s [nb_thread]\n", __FILE__);
	exit(-1);

}

int main(int argc, char **argv)
{
	unsigned nb_thread;

	if (argc != 2)
		usage();

	nb_thread = strtoul(argv[1], NULL, 10); // base 10
	if (nb_thread == 0 && errno != 0)
		panic("unable to parse input");

	return 0;
}