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