Attachment 169639 Details for Bug 196844 – patch to kqueue(2) man page

[patch] patch to kqueue(2) man page

kqueue.2.patch (text/plain), 1.39 KB, created by Fernando Apesteguía on 2016-04-24 18:26:34 UTC

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Creator: Fernando Apesteguía

Created: 2016-04-24 18:26:34 UTC

Size: 1.39 KB

patch

obsolete

>--- kqueue.2.orig	2016-04-24 19:21:21.658115000 +0200
>+++ kqueue.2	2016-04-24 19:26:35.036673000 +0200
>@@ -577,6 +577,58 @@
> If the time limit expires, then
> .Fn kevent
> returns 0.
>+.Sh EXAMPLES
>+.Bd -literal -compact
>+#include <sys/types.h>
>+#include <sys/event.h>
>+#include <sys/time.h>
>+#include <err.h>
>+#include <fcntl.h>
>+#include <stdio.h>
>+#include <stdlib.h>
>+#include <string.h>
>+#include <unistd.h>
>+
>+int
>+main(int argc, char **argv)
>+{
>+
>+	struct kevent event;	/* Event we want to monitor */
>+	struct kevent tevent;	/* Event triggered */
>+	int kq, fd, ret;
>+
>+	if (argc != 2) {
>+		err(EXIT_FAILURE, "Usage: %s path\en", argv[0]);
>+	}
>+
>+	if ((fd = open(argv[1], O_RDONLY)) == -1) {
>+		err(EXIT_FAILURE, "Failed to open '%s'", argv[1]);
>+	}
>+
>+	/* Create kqueue */
>+	if ((kq = kqueue()) == -1) {
>+		err(EXIT_FAILURE, "kqueue() failed");
>+	}
>+
>+	/* Initialize kevent structure */
>+	EV_SET(&event, fd, EVFILT_VNODE , EV_ADD | EV_ONESHOT, NOTE_WRITE, 0, NULL);
>+	
>+	for (;;) {
>+		/* Attach event to the kqueue and block until something happens */
>+		ret = kevent(kq, &event, 1, &tevent, 1, NULL);
>+		if (ret == -1) {
>+			perror("kevent");
>+			exit(EXIT_FAILURE);
>+		} else if (ret > 0) {
>+			if (event.flags & EV_ERROR) {
>+				fprintf(stderr, "Event error: %s\en", strerror(event.data));
>+			} else {
>+				printf("Something was written in '%s'\en", argv[1]);
>+			}
>+		}
>+	}
>+}
>+.Ed
> .Sh ERRORS
> The
> .Fn kqueue

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