74 lines
2.7 KiB
C
74 lines
2.7 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 <signal.h>
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#include <string.h>
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#include <time.h>
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int __rt_sigtimedwait(const sigset_t *uthese, siginfo_t *uinfo, const struct timespec *uts, size_t sigsetsize);
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/* ok, this is really subtle: <asm/signal.h> defines sigset_t differently
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* when you're in the kernel or in the C library.
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*
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* in the kernel, this is an array of 2 32-bit unsigned longs
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* in the C library, this is a single 32-bit unsigned long
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*
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* moreover, the kernel implementation of rt_sigtimedwait doesn't
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* accept anything except kernel-sized signal sets (probably a bug !)
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*
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* we thus need to create a fake kernel sigset !!
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*/
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int sigwait(const sigset_t *set, int *sig)
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{
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int ret;
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/* use a union to get rid of aliasing warnings */
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union {
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unsigned long kernel_sigset[2];
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sigset_t dummy_sigset;
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} u;
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u.kernel_sigset[0] = *set;
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u.kernel_sigset[1] = 0; /* no real-time signals supported ? */
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for (;;)
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{
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/* __rt_sigtimedwait can return EAGAIN or EINTR, we need to loop
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* around them since sigwait is only allowed to return EINVAL
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*/
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ret = __rt_sigtimedwait ( &u.dummy_sigset, NULL, NULL, sizeof(u.kernel_sigset));
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if (ret >= 0)
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break;
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if (errno != EAGAIN && errno != EINTR)
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return errno;
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}
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*sig = ret;
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return 0;
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}
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