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91 lines
2.0 KiB
91 lines
2.0 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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// Check that signal masks are handled properly for signals
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#include <stdio.h>
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#include <signal.h>
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void CheckSigs()
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{
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sigset_t sigset;
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sigprocmask(SIG_BLOCK, 0, &sigset);
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if (sigismember(&sigset, SIGUSR1))
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{
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fprintf(stderr,"usr1 blocked\n");
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}
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if (sigismember(&sigset, SIGUSR2))
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{
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fprintf(stderr,"usr2 blocked\n");
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}
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if (sigismember(&sigset, SIGTERM))
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{
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fprintf(stderr,"term blocked\n");
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}
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if (sigismember(&sigset, SIGWINCH))
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{
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fprintf(stderr,"winch blocked\n");
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}
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fprintf(stderr, "\n");
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}
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void Handler(int n)
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{
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fprintf(stderr,"In handler\n");
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fprintf(stderr,"--------------\n");
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CheckSigs();
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}
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int main()
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{
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sigset_t sigset;
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struct sigaction sa;
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sa.sa_handler = Handler;
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sa.sa_flags = 0;
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// Block sigterm in the handler
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sigemptyset(&sa.sa_mask);
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sigaddset(&sa.sa_mask, SIGTERM);
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// Block USR1 here
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sigemptyset(&sigset);
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sigaddset(&sigset, SIGUSR1);
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sigprocmask(SIG_BLOCK, &sigset, 0);
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sigaction(SIGWINCH, &sa, 0);
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fprintf(stderr,"Before signal1\n");
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fprintf(stderr,"--------------\n");
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CheckSigs();
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// the kernel blocks SIGWINCH in the handler
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kill(0, SIGWINCH);
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fprintf(stderr,"After signal1\n");
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fprintf(stderr,"--------------\n");
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CheckSigs();
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// No defer should not block SIGWINCH in handler
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sa.sa_flags |= SA_NODEFER;
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sigaction(SIGWINCH, &sa, 0);
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kill(0, SIGWINCH);
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fprintf(stderr,"After signal2\n");
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fprintf(stderr,"--------------\n");
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CheckSigs();
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return 0;
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}
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