/*
* 1.10ReadCommandsFromStandardInputAndExecuteThem.cpp
*
* Created on: Feb 11, 2015
* Author: sunyj
*/
#include "../apuesunyj.h"
#include <sys/wait.h>
static void sig_int(int); // our signal-catching function,static limit this function in this file
int main(void)
{
char buf[MAXLINE];
pid_t pid;
int status;
if (signal(SIGINT, sig_int) == SIG_ERR) // catch the ctrl + c signal
{
err_sys("signal error");
}
printf("%% "); /* print prompt (printf requires %% to print %) */
// ctrl + c invoke function sig_int, ctrl + d end this loop
while (fgets(buf, MAXLINE, stdin) != NULL)
{
if (buf[strlen(buf) - 1] == '\n')
{
buf[strlen(buf) - 1] = 0; /* replace newline with null */
}
if ((pid = fork()) < 0)
{
err_sys("fork error");
}
else if (pid == 0)
{ /* child */
execlp(buf, buf, (char *) 0);
err_ret("couldn't execute: %s", buf);
exit(127);
}
/* parent */
if ((pid = waitpid(pid, &status, 0)) < 0)
err_sys("waitpid error");
printf("%% ");
}
printf("EOF(ctrl + d) received\n");
printf("bye bye\n");
exit(0);
}
void sig_int(int signo)
{
printf("interrupt by signal ctrl + c \n%% ");
}
#include "../apuesunyj.h"
