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/*-
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 2025 Klara, Inc.
*/
/*
* A simple program to demonstrate inotify. Given one or more paths, it watches
* all events on those paths and prints them to standard output.
*/
#include <sys/types.h>
#include <sys/event.h>
#include <sys/inotify.h>
#include <assert.h>
#include <err.h>
#include <limits.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <libxo/xo.h>
static void
usage(void)
{
xo_errx(1, "usage: inotify <path1> [<path2> ...]");
}
static const char *
ev2str(uint32_t event)
{
switch (event & IN_ALL_EVENTS) {
case IN_ACCESS:
return ("IN_ACCESS");
case IN_ATTRIB:
return ("IN_ATTRIB");
case IN_CLOSE_WRITE:
return ("IN_CLOSE_WRITE");
case IN_CLOSE_NOWRITE:
return ("IN_CLOSE_NOWRITE");
case IN_CREATE:
return ("IN_CREATE");
case IN_DELETE:
return ("IN_DELETE");
case IN_DELETE_SELF:
return ("IN_DELETE_SELF");
case IN_MODIFY:
return ("IN_MODIFY");
case IN_MOVE_SELF:
return ("IN_MOVE_SELF");
case IN_MOVED_FROM:
return ("IN_MOVED_FROM");
case IN_MOVED_TO:
return ("IN_MOVED_TO");
case IN_OPEN:
return ("IN_OPEN");
default:
switch (event) {
case IN_IGNORED:
return ("IN_IGNORED");
case IN_Q_OVERFLOW:
return ("IN_Q_OVERFLOW");
case IN_UNMOUNT:
return ("IN_UNMOUNT");
}
warnx("unknown event %#x", event);
assert(0);
}
}
static void
set_handler(int kq, int sig)
{
struct kevent kev;
(void)signal(sig, SIG_IGN);
EV_SET(&kev, sig, EVFILT_SIGNAL, EV_ADD, 0, 0, NULL);
if (kevent(kq, &kev, 1, NULL, 0, NULL) < 0)
xo_err(1, "kevent");
}
int
main(int argc, char **argv)
{
struct inotify_event *iev, *iev1;
struct kevent kev;
size_t ievsz;
int ifd, kq;
argc = xo_parse_args(argc, argv);
if (argc < 2)
usage();
argc--;
argv++;
ifd = inotify_init1(IN_NONBLOCK);
if (ifd < 0)
xo_err(1, "inotify");
for (int i = 0; i < argc; i++) {
int wd;
wd = inotify_add_watch(ifd, argv[i], IN_ALL_EVENTS);
if (wd < 0)
xo_err(1, "inotify_add_watch(%s)", argv[i]);
}
xo_set_version("1");
xo_open_list("events");
kq = kqueue();
if (kq < 0)
xo_err(1, "kqueue");
/*
* Handle signals in the event loop so that we can close the xo list.
*/
set_handler(kq, SIGINT);
set_handler(kq, SIGTERM);
set_handler(kq, SIGHUP);
set_handler(kq, SIGQUIT);
/*
* Monitor the inotify descriptor for events.
*/
EV_SET(&kev, ifd, EVFILT_READ, EV_ADD, 0, 0, NULL);
if (kevent(kq, &kev, 1, NULL, 0, NULL) < 0)
xo_err(1, "kevent");
ievsz = sizeof(*iev) + NAME_MAX + 1;
iev = malloc(ievsz);
if (iev == NULL)
err(1, "malloc");
for (;;) {
ssize_t n;
const char *ev;
if (kevent(kq, NULL, 0, &kev, 1, NULL) < 0)
xo_err(1, "kevent");
if (kev.filter == EVFILT_SIGNAL)
break;
n = read(ifd, iev, ievsz);
if (n < 0)
xo_err(1, "read");
assert(n >= (ssize_t)sizeof(*iev));
for (iev1 = iev; n > 0;) {
assert(n >= (ssize_t)sizeof(*iev1));
ev = ev2str(iev1->mask);
xo_open_instance("event");
xo_emit("{:wd/%3d} {:event/%16s} {:name/%s}\n",
iev1->wd, ev, iev1->len > 0 ? iev1->name : "");
xo_close_instance("event");
n -= sizeof(*iev1) + iev1->len;
iev1 = (struct inotify_event *)(void *)
((char *)iev1 + sizeof(*iev1) + iev1->len);
}
(void)xo_flush();
}
xo_close_list("events");
if (xo_finish() < 0)
xo_err(1, "stdout");
exit(0);
}
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