78 lines
1.7 KiB
C
78 lines
1.7 KiB
C
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/* This file is part of the sample code and exercises
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* used by the class "Advanced Programming in the UNIX
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* Environment" taught by Jan Schaumann
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* <jschauma@netmeister.org> at Stevens Institute of
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* Technology.
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*
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* This file is in the public domain.
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*
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* You don't have to, but if you feel like
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* acknowledging where you got this code, you may
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* reference me by name, email address, or point
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* people to the course website:
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* https://stevens.netmeister.org/631/
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*/
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/* A simple program illustrating the use of syslog(3).
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* Just run the program, then send it SIGQUIT (^\),
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* or SIGINFO (^T), or SIGUSR[12].
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*/
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#include <err.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 <syslog.h>
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#include <unistd.h>
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#define intlen(x) (int)(sizeof(x) / sizeof(int))
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int SIGS[4] = { SIGINFO, SIGQUIT, SIGUSR1, SIGUSR2 };
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static void
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slog(int signo) {
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switch(signo) {
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/* in order of level */
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case SIGQUIT:
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syslog(LOG_ERR, "somebody sent us SIGQUIT");
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break;
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case SIGUSR1:
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/* FALLTHROUGH */
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case SIGUSR2:
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syslog(LOG_NOTICE, "SIGUSR");
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break;
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case SIGINFO:
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syslog(LOG_INFO, "received SIGINFO");
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break;
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default:
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err(EXIT_FAILURE, "Caught signal %d - this should never happen!", signo);
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/* NOTREACHED */
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}
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return;
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}
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int
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main(void) {
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openlog("slogdemo", LOG_PERROR | LOG_PID, LOG_USER);
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for (int i = 0; i < intlen(SIGS); i++) {
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if (signal(SIGS[i], slog) == SIG_ERR) {
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err(EXIT_FAILURE, "unable to catch signal %d", i);
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/* NOTREACHED */
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}
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}
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(void)printf("%d\n", getpid());
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for ( ; ; ) {
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pause();
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}
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/* NOTREACHED */
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/* We never get here, but as an example of
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* being a good citizen, we'd normally call
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* closelog(3) just like we'd call close(2)
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* for any file descriptor's we open(2)'d. */
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closelog();
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}
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