David Finder
51 lines
1.2 KiB
C
51 lines
1.2 KiB
C
#include <errno.h>
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#include <err.h>
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#include <poll.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include "../test_helpers.h"
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#include "signals_list.h"
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static void handler(int signum)
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{
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(void) signum;
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int errnum = errno;
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printf("SIGUSR1\n");
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fflush(stdout);
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errno = errnum;
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}
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int main(void)
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{
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signal(SIGUSR1, handler);
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sigset_t sigusr1;
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sigemptyset(&sigusr1);
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sigaddset(&sigusr1, SIGUSR1);
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sigprocmask(SIG_BLOCK, &sigusr1, NULL);
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sigset_t empty;
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sigemptyset(&empty);
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int fds[2];
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if ( pipe(fds) )
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err(1, "pipe");
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close(fds[0]);
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alarm(1);
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struct pollfd pfd = { .fd = fds[0], .events = POLLIN };
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// POSIX requires EINTR or returning the pending events.
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int ret = ppoll(&pfd, 1, NULL, &empty);
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if ( ret < 0 )
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ERROR_IF(ppoll, ret, <0);
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if ( pfd.revents & POLLIN )
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ERROR_IF(ppoll, pfd.revents, & POLLIN);
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if ( pfd.revents & POLLOUT )
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ERROR_IF(ppoll, pfd.revents, & POLLOUT);
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if ( pfd.revents & POLLERR )
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ERROR_IF(ppoll, pfd.revents, & POLLERR);
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if ( pfd.revents & POLLHUP )
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ERROR_IF(ppoll, pfd.revents, & POLLHUP);
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if ( pfd.revents & POLLNVAL ){
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return EXIT_SUCCESS;
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}
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return 0;
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} |