apue.2e.fig1.7.c

apue.2e.fig1.7.c

#include "apue.h"
#include <sys/wait.h>

int main()
{
        char buf[MAXLINE];
        pid_t pid;
        int status;

        printf("%% ");

        while (fgets(buf, MAXLINE, stdin) != NULL)
        {
                if (buf[strlen(buf) - 1] == '\n')
                {
                        buf[strlen(buf) - 1] = '\0';
                }

                pid = fork();
                if (pid < 0)
                {
                        err_sys("fork error");
                }
                else if (pid == 0)
                {
                        /* child */
                        execlp(buf, buf, (char*)0);
                        err_ret("couldn't exec: %s", buf);
                        return 127;
                }
                else
                {
                        /* parent */
                        if ((pid = waitpid(pid, &status, 0)) < 0)
                        {
                                err_sys("waitpid error");
                        }
                        printf("%% ");
                }
        }
        return 0;
}