exec1.c

UNIX编程高级环境（第二版）的进程部分的程序源码

#include    <sys/types.h>
#include    <sys/wait.h>
#include    "ourhdr.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/hop/lecture/apue/SourceCode/proc/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);
}