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fork debugging : back to parent.
- From: "Richard (sent by Nabble.com)" <lists at nabble dot com>
- To: gdb at sources dot redhat dot com
- Date: Mon, 7 Aug 2006 13:21:02 -0700 (PDT)
- Subject: fork debugging : back to parent.
- Reply-to: Richard <rgrdev at gmail dot com>
Below is the code from "Advanced programming in the Unix environment". if I
set follow-fork to child, I can step ok to the exclp line. But how do I get
back to debugging the parent process? Is it possible? I tried setting
follow-fork back to "parent" and then "c"ontinuing but no joy. or do I have
to specifically save process ids and reattach to the parent process?
=======
#include "apue.h"
#include <sys/wait.h>
int
main(void)
{
char buf[MAXLINE]; /* from apue.h */
pid_t pid;
int status;
printf("%% "); /* print prompt (printf requires %% to print %) */
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("%% ");
}
exit(0);
}
--
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