mirror of
https://github.com/troglobit/libuev.git
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90 lines
1.8 KiB
C
90 lines
1.8 KiB
C
/* Example with fork and signals, in this case Ctrl-C, from terminal
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*
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* A common problem for users of libuEV is how to combine it with the
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* traditional aspects of UNIX. Since libuEV is just a wrapper for
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* signalfd() and epoll(), in this case, it can be worth a dedicated
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* example. After all, command line use with Ctrl-C is one of the most
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* common use-cases.
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*/
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#include <stdio.h>
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#include <signal.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include "src/uev.h"
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void timeout(uev_t *w, void *arg, int events)
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{
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char *id = (char *)arg;
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if (UEV_ERROR == events)
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puts("Ignoring timer watcher error ...");
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printf("I am the %s robot\n", id);
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}
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void teaser(uev_t *w, void *arg, int events)
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{
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(void)arg;
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if (UEV_ERROR == events)
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puts("Ignoring SIGINT watcher error ...");
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puts("\nWe are here to protect you ...");
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puts("Sorry, you actually need to press Ctrl-\\ to exit.");
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}
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void cleanup(uev_t *w, void *arg, int events)
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{
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(void)arg;
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if (UEV_ERROR == events)
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puts("Ignoring signal watcher error ...");
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/* Graceful exit, with optional cleanup ... */
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puts("\nAgainst the terrible secret of space.");
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uev_exit(w->ctx);
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}
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int main(int argc, char **argv)
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{
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uev_ctx_t ctx;
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uev_t timerw;
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uev_t sig1w;
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uev_t sig2w;
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char *robot;
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pid_t pid;
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pid = fork();
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if (pid == -1)
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return 1;
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if (pid > 0)
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robot = "Shover";
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else
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robot = "Pusher";
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setsid(); /* puts child in new process group */
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uev_init(&ctx);
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/* example worker, a timer callback */
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uev_timer_init(&ctx, &timerw, timeout, robot, 100, 2000);
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/* the owls are not what they seem ... */
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uev_signal_init(&ctx, &sig1w, teaser, NULL, SIGINT);
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uev_signal_init(&ctx, &sig2w, cleanup, NULL, SIGQUIT);
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puts("Starting, press Ctrl-C to exit.");
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return uev_run(&ctx, 0);
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}
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/**
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* Local Variables:
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* compile-command: "make forky; ./forky"
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* c-file-style: "linux"
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* End:
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*/
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