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// This is an example kqueue program which watches a directory and all paths in
// it with the same flags as those fsnotify uses. This is useful sometimes to
// test what events kqueue sends with as little abstraction as possible.
//
// Note this does *not* set up monitoring on new files as they're created.
//
// Usage:
// cc kqueue.c -o kqueue
// ./kqueue /path/to/dir
#include <sys/event.h>
#include <sys/time.h>
#include <dirent.h>
#include <fcntl.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
void die(const char *fmt, ...) {
va_list ap;
va_start(ap, fmt);
vfprintf(stderr, fmt, ap);
va_end(ap);
if (fmt[0] && fmt[strlen(fmt)-1] == ':') {
fputc(' ', stderr);
perror(NULL);
}
else
fputc('\n', stderr);
exit(1);
}
int main(int argc, char* argv[]) {
if (argc < 2) {
fprintf(stderr, "usage: %s path/to/dir\n", argv[0]);
return 1;
}
char *dir = argv[1];
int kq = kqueue();
if (kq == -1)
die("kqueue:");
int fp = open(dir, O_RDONLY);
if (fp == -1)
die("open: %s:", dir);
DIR *dp = fdopendir(fp);
if (dp == NULL)
die("fdopendir:");
int fds[1024] = {fp};
char *names[1024] = {dir};
int n_fds = 0;
struct dirent *ls;
while ((ls = readdir(dp)) != NULL) {
if (ls->d_name[0] == '.')
continue;
char *path = malloc(strlen(dir) + strlen(ls->d_name) + 2);
sprintf(path, "%s/%s", dir, ls->d_name);
int fp = open(path, O_RDONLY | O_PATH | O_NOFOLLOW);
if (fp == -1)
die("open: %s:", path);
fds[++n_fds] = fp;
names[n_fds] = path;
}
for (int i=0; i<=n_fds; i++) {
struct kevent changes;
EV_SET(&changes, fds[i], EVFILT_VNODE,
EV_ADD | EV_CLEAR | EV_ENABLE,
NOTE_DELETE | NOTE_WRITE | NOTE_ATTRIB | NOTE_RENAME,
0, 0);
int n = kevent(kq, &changes, 1, NULL, 0, NULL);
if (n == -1)
die("register kevent changes:");
}
printf("Ready; press ^C to exit\n");
for (;;) {
struct kevent event;
int n = kevent(kq, NULL, 0, &event, 1, NULL);
if (n == -1)
die("kevent:");
if (n == 0)
continue;
char *ev_name = malloc(128);
if (event.fflags & NOTE_WRITE)
strncat(ev_name, "WRITE ", 6);
if (event.fflags & NOTE_RENAME)
strncat(ev_name, "RENAME ", 6);
if (event.fflags & NOTE_ATTRIB)
strncat(ev_name, "CHMOD ", 5);
if (event.fflags & NOTE_DELETE) {
strncat(ev_name, "DELETE ", 7);
struct kevent changes;
EV_SET(&changes, event.ident, EVFILT_VNODE,
EV_DELETE,
NOTE_DELETE | NOTE_WRITE | NOTE_ATTRIB | NOTE_RENAME,
0, 0);
int n = kevent(kq, &changes, 1, NULL, 0, NULL);
if (n == -1)
die("remove kevent on delete:");
}
char *name;
for (int i=0; i<=n_fds; i++)
if (fds[i] == event.ident) {
name = names[i];
break;
}
printf("%-13s %s\n", ev_name, name);
}
return 0;
}
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