#include <unistd.h>#include <sys/limits.h>#include <string.h> extern char **environ; /* * BUG: instead of looking at PATH env variable, * just try prepending /bin/ if name fails... */ intexecvp(const char *name, const char **argv){	int n;	char buf[PATH_MAX]; 	if((n=execve(name, argv, environ)) < 0){		strcpy(buf, "/bin/");		strcpy(buf+5, name);		n = execve(buf, argv, environ);	}	return n;}