fae89fc404
We could special-case raise(3) in non-threaded programs, but the more conservative course is to make pthread_kill(3) work in signal handlers at the cost of a race shared by other C libraries. Change-Id: I59fb23d03bdabf403435e731704b33acdf3e0234
55 lines
1.9 KiB
C++
55 lines
1.9 KiB
C++
/*
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* Copyright (C) 2008 The Android Open Source Project
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <errno.h>
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#include <unistd.h>
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#include "ErrnoRestorer.h"
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#include "pthread_accessor.h"
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extern "C" int tgkill(int tgid, int tid, int sig);
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int pthread_kill(pthread_t t, int sig) {
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ErrnoRestorer errno_restorer;
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pthread_accessor thread(t);
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if (thread.get() == NULL) {
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return ESRCH;
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}
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// There's a race here, but it's one we share with all other C libraries.
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pid_t tid = thread->tid;
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thread.Unlock();
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int rc = tgkill(getpid(), tid, sig);
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if (rc == -1) {
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return errno;
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}
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return 0;
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}
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