Avoid zombie processes on Linux

ignchild.c

/*
 * Avoid creation of zombie process by child processes.
 * build: gcc -O2 ignchld.c -o ignchld
 * usage: ignchld bad-command-that-creates-zombie-processes [args ...]
 */

#include <signal.h>
#include <string.h>
#include <unistd.h>

int main(int argc, char *argv[])
{
	signal(SIGCHLD, SIG_IGN);
	strncpy(argv[0], "env", strlen(argv[0]));
	execv("/usr/bin/env", argv);
	
	return -1;
}