ae3dde8012
Previously, we'd allocate the TTY, spawn a service on it, but immediately start processing the TTY and forwarding it to whatever the commnd was started on. This is however problematic, as the TTY might get actually opened only much later by the service. We'll hence first get EIOs on the master as the other side is still closed, and hence considered it hung up and terminated the session. With this change we add a flag to the pty forwarding logic: PTY_FORWARD_IGNORE_INITIAL_VHANGUP. If set, we'll ignore all hangups (i.e. EIOs) on the master PTY until the first byte is successfully read. From that point on we consider a hangup/EIO a regular connection termination. This way, we handle the race: when we get EIO initially we'll ignore it, until the connection is properly set up, at which time we start honouring it.
49 lines
1.5 KiB
C
49 lines
1.5 KiB
C
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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#pragma once
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/***
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This file is part of systemd.
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Copyright 2010-2013 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <stdbool.h>
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#include "sd-event.h"
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typedef struct PTYForward PTYForward;
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typedef enum PTYForwardFlags {
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PTY_FORWARD_READ_ONLY = 1,
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/* Continue reading after hangup? */
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PTY_FORWARD_IGNORE_VHANGUP = 2,
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/* Continue reading after hangup but only if we never read anything else? */
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PTY_FORWARD_IGNORE_INITIAL_VHANGUP = 4,
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} PTYForwardFlags;
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int pty_forward_new(sd_event *event, int master, PTYForwardFlags flags, PTYForward **f);
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PTYForward *pty_forward_free(PTYForward *f);
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int pty_forward_get_last_char(PTYForward *f, char *ch);
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int pty_forward_set_ignore_vhangup(PTYForward *f, bool ignore_vhangup);
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int pty_forward_get_ignore_vhangup(PTYForward *f);
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DEFINE_TRIVIAL_CLEANUP_FUNC(PTYForward*, pty_forward_free);
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