Hello all,
My scripts, which read stdout from ssh, weren't seeing EOF from the
remote session. It was being sent, but lost. I tracked it down to the
following code, in ssh.c, at ssh_session2_open:
if (stdin_null_flag) {
in = open(_PATH_DEVNULL, O_RDONLY);
} else {
in = dup(STDIN_FILENO);
}
out = dup(STDOUT_FILENO);
err = dup(STDERR_FILENO);
The remote session did close stdout. The sshd from which it was spawned
signaled to close stdout. The ssh program received that signal and
closed, well, something, but not stdout. It closed a copy.
Importantly, it left a copy open, so my program got no EOF.
Why not:
if (stdin_null_flag) {
in = open(_PATH_DEVNULL, O_RDONLY);
} else {
in = STDIN_FILENO;
}
out = STDOUT_FILENO;
err = STDERR_FILENO;
If not that, how is a program that reads from ssh's output ever going to
see EOF?
Thanks,
David
_______________________________________________
openssh-unix-dev mailing list
openssh-unix-dev@xxxxxxxxxxx
https://lists.mindrot.org/mailman/listinfo/openssh-unix-dev
