exec.c

#include"common.h"
#include <sys/wait.h>
char    *env_init[] = { "USER=unknown", "PATH=/tmp", NULL };
int
main(void)
{
    pid_t   pid;
    if ((pid = fork()) < 0) {
        err_sys("fork error");
    } else if (pid == 0) {  /* specify pathname, specify environment */
        if (execle("/home/sar/bin/echoall", "echoall", "myarg1",
                "MY ARG2", (char *)0, env_init) < 0)
            err_sys("execle error");
    }
    if (waitpid(pid, NULL, 0) < 0)
        err_sys("wait error");
    if ((pid = fork()) < 0) {
        err_sys("fork error");
    } else if (pid == 0) {  /* specify filename, inherit environment */
        if (execlp("echoall", "echoall", "only 1 arg", (char *)0) < 0)
            err_sys("execlp error");
    }
    exit(0);
}