mirror of
https://gitlab.freedesktop.org/pulseaudio/pulseaudio.git
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5effc83479
FSF addresses used in PA sources are no longer valid and rpmlint generates numerous warnings during packaging because of this. This patch changes all FSF addresses to FSF web page according to the GPL how-to: https://www.gnu.org/licenses/gpl-howto.en.html Done automatically by sed-ing through sources.
57 lines
1.8 KiB
C
57 lines
1.8 KiB
C
/***
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This file is part of PulseAudio.
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Copyright 2009 Lennart Poettering
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PulseAudio is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published
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by the Free Software Foundation; either version 2.1 of the License,
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or (at your option) any later version.
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PulseAudio 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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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 PulseAudio; if not, see <http://www.gnu.org/licenses/>.
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***/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include <unistd.h>
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#include <pulsecore/atomic.h>
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#include <pulsecore/macro.h>
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#include "fork-detect.h"
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int pa_detect_fork(void) {
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static pa_atomic_t pid = PA_ATOMIC_INIT((int) -1);
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/* Some really stupid applications (Hey, vim, that means you!)
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* love to fork after initializing
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* gtk/libcanberra/pulseaudio. This is really bad style. We
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* however have to deal with this cleanly, so we try to detect the
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* forks making sure all our calls fail cleanly after the fork. */
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pa_assert_cc(sizeof(pa_atomic_t) >= sizeof(pid_t));
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for (;;) {
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pid_t stored_pid = (pid_t) pa_atomic_load(&pid);
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/* First let's check whether the current pid matches the stored one */
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if (stored_pid == getpid())
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return false;
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/* Does it contain a different PID than ours? Then the process got forked. */
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if ((int) stored_pid != (int) -1)
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return true;
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/* Ok, it still contains no PID, then store it */
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if (pa_atomic_cmpxchg(&pid, (int) -1, (int) getpid()))
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return false;
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}
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}
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