151 lines
3.5 KiB
C
151 lines
3.5 KiB
C
/* Copyright 2017 Max Voit
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*
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* This file is part of sxiv.
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*
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* sxiv is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published
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* by the Free Software Foundation; either version 2 of the License,
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* or (at your option) any later version.
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*
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* sxiv is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with sxiv. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/inotify.h>
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#include <libgen.h>
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#include "util.h"
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#include "autoreload.h"
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CLEANUP void arl_cleanup(arl_t *arl)
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{
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if (arl->fd != -1 && arl->wd != -1)
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{
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if(inotify_rm_watch(arl->fd, arl->wd))
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error(0, 0, "Failed to remove inotify watch.");
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}
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}
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static void arl_setup_dir(arl_t *arl, const char *filepath)
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{
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char *dntmp, *dn;
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if (arl->fd == -1)
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{
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error(0, 0, "Uninitialized, could not add inotify watch on directory.");
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return;
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}
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/* get dirname */
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dntmp = (char*) strdup(filepath);
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dn = (char*) dirname(dntmp);
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/* this is not one-shot as other stuff may be created too
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note: we won't handle deletion of the directory itself,
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this is a design decision */
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arl->wd = inotify_add_watch(arl->fd, dn,IN_CREATE);
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if (arl->wd == -1)
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error(0, 0, "Failed to add inotify watch on directory '%s'.", dn);
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else
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arl->watching_dir = true;
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free(dntmp);
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}
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bool arl_handle(arl_t *arl, const char *filepath)
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{
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bool reload = false;
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ssize_t len;
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char buf[4096] __attribute__ ((aligned(__alignof__(struct inotify_event))));
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const struct inotify_event *event;
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char *ptr;
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char *fntmp, *fn;
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len = read(arl->fd, buf, sizeof buf);
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if (len == -1)
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{
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error(0, 0, "Failed to read inotify events.");
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return false;
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}
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for (ptr = buf; ptr < buf + len;
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ptr += sizeof(struct inotify_event) + event->len)
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{
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event = (const struct inotify_event *) ptr;
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/* events from watching the file itself */
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if (event->mask & IN_CLOSE_WRITE)
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{
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reload = true;
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}
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if (event->mask & IN_DELETE_SELF)
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arl_setup_dir(arl, filepath);
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/* events from watching the file's directory */
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if (event->mask & IN_CREATE)
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{
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fntmp = strdup(filepath);
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fn = basename(fntmp);
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if (0 == strcmp(event->name, fn))
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{
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/* this is the file we're looking for */
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/* cleanup, this has not been one-shot */
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if (arl->watching_dir)
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{
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if(inotify_rm_watch(arl->fd, arl->wd))
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error(0, 0, "Failed to remove inotify watch.");
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arl->watching_dir = false;
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}
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reload = true;
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}
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free(fntmp);
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}
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}
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return reload;
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}
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void arl_init(arl_t *arl)
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{
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/* this needs to be done only once */
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arl->fd = inotify_init();
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arl->watching_dir = false;
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if (arl->fd == -1)
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error(0, 0, "Could not initialize inotify.");
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}
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void arl_setup(arl_t *arl, const char *filepath)
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{
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if (arl->fd == -1)
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{
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error(0, 0, "Uninitialized, could not add inotify watch.");
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return;
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}
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/* may have switched from a deleted to another image */
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if (arl->watching_dir)
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{
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if (inotify_rm_watch(arl->fd, arl->wd))
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error(0, 0, "Failed to remove inotify watch.");
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arl->watching_dir = false;
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}
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arl->wd = inotify_add_watch(arl->fd, filepath,
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IN_ONESHOT | IN_CLOSE_WRITE | IN_DELETE_SELF);
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if (arl->wd == -1)
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error(0, 0, "Failed to add inotify watch on file '%s'.", filepath);
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}
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