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/* This file is part of GNU Dico.
Copyright (C) 2024 Sergey Poznyakoff
GNU Dico is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.
GNU Dico is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with GNU Dico. If not, see <http://www.gnu.org/licenses/>. */
#include <config.h>
#include <stdlib.h>
#include <unistd.h>
#include <poll.h>
#include <sys/inotify.h>
#include <sys/ioctl.h>
#include "gcide.h"
#include <errno.h>
#include <appi18n.h>
WATCHER
watcher_setup(char const *dbdir)
{
WATCHER w;
int wfd;
w = calloc(1, sizeof(*w));
if (!w) {
DICO_LOG_MEMERR();
return NULL;
}
if ((w->fd = inotify_init()) == -1) {
DICO_LOG_ERRNO();
free(w);
return NULL;
}
wfd = inotify_add_watch(w->fd, dbdir,
IN_DELETE | IN_CREATE | IN_CLOSE_WRITE |
IN_MOVED_FROM | IN_MOVED_TO);
if (wfd == -1) {
dico_log(L_ERR, errno, "inotify_add_watch");
close(w->fd);
free(w);
return NULL;
}
w->events = POLLIN;
return w;
}
void
watcher_close(WATCHER w)
{
if (w) {
close(w->fd);
free(w);
}
}
int
watcher_is_modified(WATCHER w)
{
int changed = 0;
int rc;
if (!w)
return 1;
while ((rc = poll(w, 1, 0)) != 0) {
if (rc == -1) {
if (errno != EINTR)
dico_log(L_ERR, errno, "watcher_is_modified: poll failed");
break;
}
if (w->revents & POLLIN) {
char buffer[4096];
int n;
n = read(w->fd, buffer, sizeof(buffer));
if (n == -1) {
dico_log(L_ERR, errno, "watcher_is_modified: read");
return 0;
}
if (!changed) {
struct inotify_event *ep = (struct inotify_event *) buffer;
while (n) {
int size;
if (ep->wd >= 0) {
if (ep->mask & IN_IGNORED)
/* nothing */ ;
else if (ep->mask & IN_Q_OVERFLOW)
dico_log(L_NOTICE, 0, "event queue overflow");
else if (ep->mask & IN_UNMOUNT)
/* FIXME: no special handling for now */;
else {
changed = 1;
break;
}
}
size = sizeof(*ep) + ep->len;
ep = (struct inotify_event *) ((char*) ep + size);
n -= size;
}
}
}
}
return changed;
}
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