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42 lines
970 B
C
42 lines
970 B
C
#define _GNU_SOURCE
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#include <sys/types.h>
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#include <sys/poll.h>
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#include <signal.h>
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#include <fcntl.h>
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#include <stdio.h>
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int main() {
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int signum=SIGRTMIN+1;
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sigset_t ss;
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sigemptyset(&ss);
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sigaddset(&ss,signum);
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sigaddset(&ss,SIGIO);
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sigprocmask(SIG_BLOCK,&ss,0);
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fcntl(0 /* fd */,F_SETOWN,getpid());
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fcntl(0 /* fd */,F_SETSIG,signum);
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#if defined(O_ONESIGFD) && defined(F_SETAUXFL)
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fcntl(0 /* fd */, F_SETAUXFL, O_ONESIGFD);
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#endif
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fcntl(0 /* fd */,F_SETFL,fcntl(0 /* fd */,F_GETFL)|O_NONBLOCK|O_ASYNC);
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{
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siginfo_t info;
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struct timespec timeout;
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int r;
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timeout.tv_sec=1; timeout.tv_nsec=0;
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switch ((r=sigtimedwait(&ss,&info,&timeout))) {
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case SIGIO:
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/* signal queue overflow */
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signal(signum,SIG_DFL);
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/* do poll */
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break;
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default:
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if (r==signum) {
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printf("event %c%c on fd #%d\n",info.si_band&POLLIN?'r':'-',info.si_band&POLLOUT?'w':'-',info.si_fd);
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}
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}
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}
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return 0;
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}
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