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/* direvent - directory content watcher daemon
Copyright (C) 2012-2014 Sergey Poznyakoff
Direvent 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 of the License, or (at your
option) any later version.
Direvent 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 direvent. If not, see <http://www.gnu.org/licenses/>. */
#include "direvent.h"
#include <signal.h>
#include <sys/inotify.h>
/* Event codes */
struct transtab sysev_transtab[] = {
{ "ACCESS", IN_ACCESS },
{ "ATTRIB", IN_ATTRIB },
{ "CLOSE_WRITE", IN_CLOSE_WRITE },
{ "CLOSE_NOWRITE", IN_CLOSE_NOWRITE },
{ "CREATE", IN_CREATE },
{ "DELETE", IN_DELETE },
{ "MODIFY", IN_MODIFY },
{ "MOVED_FROM", IN_MOVED_FROM },
{ "MOVED_TO", IN_MOVED_TO },
{ "OPEN", IN_OPEN },
{ 0 }
};
event_mask genev_xlat[] = {
{ GENEV_CREATE, IN_CREATE|IN_MOVED_TO },
{ GENEV_WRITE, IN_MODIFY|IN_CLOSE_WRITE },
{ GENEV_ATTRIB, IN_ATTRIB },
{ GENEV_DELETE, IN_DELETE|IN_MOVED_FROM },
{ 0 }
};
static int ifd;
int
sysev_filemask(struct dirwatcher *dp)
{
return 0;
}
void
sysev_init()
{
ifd = inotify_init();
if (ifd == -1) {
diag(LOG_CRIT, "inotify_init: %s", strerror(errno));
exit(1);
}
}
int
sysev_add_watch(struct dirwatcher *dwp, event_mask mask)
{
return inotify_add_watch(ifd, dwp->dirname, mask.sys_mask);
}
void
sysev_rm_watch(struct dirwatcher *dwp)
{
inotify_rm_watch(ifd, dwp->wd);
}
/* Remove a watcher identified by its directory and file name */
void
remove_watcher(const char *dir, const char *name)
{
struct dirwatcher *dwp;
char *fullname = mkfilename(dir, name);
if (!fullname) {
diag(LOG_EMERG, "not enough memory: "
"cannot look up a watcher to delete");
return;
}
dwp = dirwatcher_lookup(fullname);
free(fullname);
if (dwp)
dirwatcher_destroy(dwp);
}
static void
process_event(struct inotify_event *ep)
{
struct dirwatcher *dp;
struct handler *h;
event_mask m;
char *dirname, *filename;
dp = dirwatcher_lookup_wd(ep->wd);
if (ep->mask & IN_IGNORED)
return;
else if (ep->mask & IN_Q_OVERFLOW) {
diag(LOG_NOTICE,
"event queue overflow");
return;
} else if (ep->mask & IN_UNMOUNT) {
/* FIXME: not sure if there's
anything to do. Perhaps we should
deregister the watched dirs that
were located under the mountpoint
*/
return;
} else if (!dp) {
if (ep->name)
diag(LOG_NOTICE, "unrecognized event %x"
"for %s", ep->mask, ep->name);
else
diag(LOG_NOTICE,
"unrecognized event %x", ep->mask);
return;
}
ev_log(ep->mask, dp);
if (ep->mask & IN_CREATE) {
debug(1, ("%s/%s created", dp->dirname, ep->name));
if (check_new_watcher(dp->dirname, ep->name) > 0)
return;
} else if (ep->mask & (IN_DELETE|IN_MOVED_FROM)) {
debug(1, ("%s/%s deleted", dp->dirname, ep->name));
remove_watcher(dp->dirname, ep->name);
}
if (ep->len == 0)
filename = split_pathname(dp, &dirname);
else {
dirname = dp->dirname;
filename = ep->name;
}
for (h = dp->handler_list; h; h = h->next) {
if (handler_matches_event(h, sys, ep->mask, filename))
run_handler(h, event_mask_init(&m,
ep->mask,
&h->ev_mask),
dirname, filename);
}
unsplit_pathname(dp);
}
int
sysev_select()
{
char buffer[4096];
struct inotify_event *ep;
size_t size;
ssize_t rdbytes;
rdbytes = read(ifd, buffer, sizeof(buffer));
if (rdbytes == -1) {
if (errno == EINTR) {
if (signo == SIGCHLD || signo == SIGALRM)
return 0;
diag(LOG_NOTICE, "got signal %d", signo);
return 1;
}
diag(LOG_NOTICE, "read failed: %s", strerror(errno));
return 1;
}
ep = (struct inotify_event *) buffer;
while (rdbytes) {
if (ep->wd >= 0)
process_event(ep);
size = sizeof(*ep) + ep->len;
ep = (struct inotify_event *) ((char*) ep + size);
rdbytes -= size;
}
return 0;
}
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