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105 lines
2.2 KiB
105 lines
2.2 KiB
/*
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* Copyright 2002-2019 Intel Corporation.
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*
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* This software is provided to you as Sample Source Code as defined in the accompanying
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* End User License Agreement for the Intel(R) Software Development Products ("Agreement")
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* section 1.L.
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*
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* This software and the related documents are provided as is, with no express or implied
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* warranties, other than those that are expressly stated in the License.
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*/
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/*
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* Verifies that handles the application's signal mask correctly even when
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* one signal interrupts another signal's handler.
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <stdarg.h>
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#include <signal.h>
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static void HandleUSR1(int);
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static void HandleUSR2(int);
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static int CheckMask(int, ...);
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main()
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{
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struct sigaction sigact;
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sigact.sa_handler = HandleUSR1;
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sigemptyset(&sigact.sa_mask);
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sigact.sa_flags = 0;
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if (sigaction(SIGUSR1, &sigact, 0) == -1) {
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fprintf(stderr, "Unable handle signal USR1\n");
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return 1;
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}
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sigact.sa_handler = HandleUSR2;
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if (sigaction(SIGUSR2, &sigact, 0) == -1) {
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fprintf(stderr, "Unable handle signal USR2\n");
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return 1;
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}
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raise(SIGUSR1);
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if (!CheckMask(0))
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return 1;
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return 0;
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}
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static void HandleUSR1(int sig)
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{
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if (!CheckMask(SIGUSR1, 0))
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exit(1);
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raise(SIGUSR2);
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}
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static void HandleUSR2(int sig)
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{
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if (!CheckMask(SIGUSR1, SIGUSR2, 0))
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exit(1);
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}
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static int CheckMask(int sig, ...)
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{
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sigset_t curMask;
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sigset_t checkMask;
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va_list ap;
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int ret;
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sigprocmask(SIG_SETMASK, 0, &curMask);
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sigemptyset(&checkMask);
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if (sig != 0)
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{
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sigaddset(&checkMask, sig);
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va_start(ap, sig);
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while ((sig = va_arg(ap, int)))
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sigaddset(&checkMask, sig);
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va_end(ap);
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}
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ret = 1;
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for (sig = 1; sig < 32; sig++)
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{
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if (!sigismember(&curMask, sig) && sigismember(&checkMask, sig))
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{
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fprintf(stderr, "Mask missing signal %d\n", sig);
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ret = 0;
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}
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if (sigismember(&curMask, sig) && !sigismember(&checkMask, sig))
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{
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fprintf(stderr, "Mask unexpectedly has signal %d\n", sig);
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ret = 0;
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}
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}
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return ret;
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}
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