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From: Andrew Barton <>
Subject: forkpty with streams
Date: 24 Jul 2003 23:28:36 +0000	[thread overview]
Message-ID: <1059089316.8596.14.camel@localhost> (raw)

I've got the 2.4 kernel, and I'm trying to use the forkpty() system call
with the standard I/O stream functions. The calls to forkpty() and
fdopen() and fprintf() all return successfully, but the data never seems
to get to the child process. In this simplified example, I am trying to
open a shell in a pseudo terminal and then send it the string "exit\n"
and then wait for it to die. But the shell apparently never sees the
"exit\n", and the parent waits forever.

#include <unistd.h>
#include <sys/types.h>
#include <stdio.h>

	int fd;
	pid_t pid;

	pid = forkpty (&fd, 0, 0, 0);
	if (pid == 0) {
		execlp ("sh", "sh", (void *)0);
		_exit (1);
	} else if (pid == -1) {
		return 1;
	} else {
		FILE *F;

		F = fdopen (fd, "w");
		fprintf (F, "exit\n");
		fflush (F);
		wait (0);
	return 0;

             reply	other threads:[~2003-07-25  6:14 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2003-07-24 23:28 Andrew Barton [this message]
2003-07-25 13:02 ` forkpty with streams Doug McNaught
2003-07-25 15:27 ` Andries Brouwer
2003-07-25 10:59   ` Andrew Barton
2003-07-25 18:46     ` Matti Aarnio
2003-07-25 12:53       ` Andrew Barton
2003-07-25 20:10     ` Andries Brouwer

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