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Intel Open Source License 

Copyright (c) 2002-2005 Intel Corporation 
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END_LEGAL */
// Check that signal masks are handled properly for signals

#include <stdio.h>
#include <signal.h>

void CheckSigs()
{
    sigset_t sigset;
    sigprocmask(SIG_BLOCK, 0, &sigset);
    
    if (sigismember(&sigset, SIGUSR1))
    {
        fprintf(stderr,"usr1 blocked\n");
    }
    if (sigismember(&sigset, SIGUSR2))
    {
        fprintf(stderr,"usr2 blocked\n");
    }
    if (sigismember(&sigset, SIGTERM))
    {
        fprintf(stderr,"term blocked\n");
    }
    if (sigismember(&sigset, SIGWINCH))
    {
        fprintf(stderr,"winch blocked\n");
    }
    fprintf(stderr, "\n");
}

void Handler(int n)
{
    fprintf(stderr,"In handler\n");
    fprintf(stderr,"--------------\n");
    CheckSigs();
}



int main()
{
    sigset_t sigset;
    
    struct sigaction sa;
    sa.sa_handler = Handler;
    sa.sa_flags = 0;
    
    // Block sigterm in the handler
    sigemptyset(&sa.sa_mask);
    sigaddset(&sa.sa_mask, SIGTERM);

    // Block USR1 here
    sigemptyset(&sigset);
    sigaddset(&sigset, SIGUSR1);
    sigprocmask(SIG_BLOCK, &sigset, 0);
    
    sigaction(SIGWINCH, &sa, 0);

    fprintf(stderr,"Before signal1\n");
    fprintf(stderr,"--------------\n");
    CheckSigs();

    // the kernel blocks SIGWINCH in the handler
    kill(0, SIGWINCH);
    
    fprintf(stderr,"After signal1\n");
    fprintf(stderr,"--------------\n");
    CheckSigs();

    // No defer should not block SIGWINCH in handler
    sa.sa_flags |= SA_NODEFER;
    sigaction(SIGWINCH, &sa, 0);
    kill(0, SIGWINCH);

    fprintf(stderr,"After signal2\n");
    fprintf(stderr,"--------------\n");
    CheckSigs();

    return 0;
}