5375bf6398
Implement the legacy SysV signal handling functions sighold(), sigignore(), sigpause(), sigrelse(), and sigset() in terms of the newer POSIX signal APIs. As of POSIX 2013 the SysV signal APIs are deprecated but still required. Change-Id: I4ca40e3d706605a7d1a30dc76c78b2b24586387d Signed-off-by: Greg Hackmann <ghackmann@google.com>
56 lines
2.1 KiB
C++
56 lines
2.1 KiB
C++
/*
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* Copyright (C) 2016 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 <signal.h>
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#include <string.h>
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sighandler_t sigset(int sig, sighandler_t disp) {
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struct sigaction new_sa;
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if (disp != SIG_HOLD) {
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memset(&new_sa, 0, sizeof(new_sa));
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new_sa.sa_handler = disp;
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sigemptyset(&new_sa.sa_mask);
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}
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struct sigaction old_sa;
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if (sigaction(sig, disp == SIG_HOLD ? nullptr : &new_sa, &old_sa) == -1) {
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return SIG_ERR;
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}
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sigset_t new_proc_mask;
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sigemptyset(&new_proc_mask);
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sigaddset(&new_proc_mask, sig);
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sigset_t old_proc_mask;
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if (sigprocmask(disp == SIG_HOLD ? SIG_BLOCK : SIG_UNBLOCK,
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&new_proc_mask, &old_proc_mask) == -1) {
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return SIG_ERR;
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}
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return sigismember(&old_proc_mask, sig) ? SIG_HOLD : old_sa.sa_handler;
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}
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