147 lines
3.3 KiB
C
147 lines
3.3 KiB
C
/* Copyright 2017 Max Voit, Bert Muennich
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* Copyright 2022-2023 nsxiv contributors
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*
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* This file is a part of nsxiv.
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*
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* nsxiv 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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* nsxiv 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 nsxiv. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "nsxiv.h"
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#if HAVE_INOTIFY
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#include <assert.h>
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#include <errno.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/inotify.h>
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#include <unistd.h>
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static struct { char *buf; size_t len; } scratch;
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void arl_init(arl_t *arl)
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{
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arl->fd = inotify_init1(IN_CLOEXEC | IN_NONBLOCK);
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arl->wd_dir = arl->wd_file = -1;
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if (arl->fd == -1)
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error(0, 0, "Could not initialize inotify, no automatic image reloading");
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}
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CLEANUP void arl_cleanup(arl_t *arl)
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{
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if (arl->fd != -1)
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close(arl->fd);
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free(scratch.buf);
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}
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static void rm_watch(int fd, int *wd)
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{
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if (*wd != -1) {
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inotify_rm_watch(fd, *wd);
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*wd = -1;
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}
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}
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static void add_watch(int fd, int *wd, const char *path, uint32_t mask)
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{
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*wd = inotify_add_watch(fd, path, mask);
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if (*wd == -1)
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error(0, errno, "inotify: %s", path);
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}
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static char *arl_scratch_push(const char *filepath, size_t len)
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{
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if (scratch.len < len + 1) {
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scratch.len = len + 1;
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scratch.buf = erealloc(scratch.buf, scratch.len);
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}
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scratch.buf[len] = '\0';
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return memcpy(scratch.buf, filepath, len);
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}
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void arl_add(arl_t *arl, const char *filepath)
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{
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char *base, *dir;
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if (arl->fd == -1)
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return;
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rm_watch(arl->fd, &arl->wd_dir);
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rm_watch(arl->fd, &arl->wd_file);
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add_watch(arl->fd, &arl->wd_file, filepath, IN_CLOSE_WRITE | IN_DELETE_SELF);
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base = strrchr(filepath, '/');
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assert(base != NULL); /* filepath must be result of `realpath(3)` */
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dir = arl_scratch_push(filepath, base - filepath);
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add_watch(arl->fd, &arl->wd_dir, dir, IN_CREATE | IN_MOVED_TO);
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arl->filename = arl_scratch_push(base + 1, strlen(base + 1));
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}
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bool arl_handle(arl_t *arl)
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{
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bool reload = false;
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char *ptr;
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const struct inotify_event *e;
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/* inotify_event aligned buffer */
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static union { char d[4096]; struct inotify_event e; } buf;
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while (true) {
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ssize_t len = read(arl->fd, buf.d, sizeof(buf.d));
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if (len == -1) {
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if (errno == EINTR)
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continue;
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break;
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}
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for (ptr = buf.d; ptr < buf.d + len; ptr += sizeof(*e) + e->len) {
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e = (const struct inotify_event*) ptr;
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if (e->wd == arl->wd_file && (e->mask & IN_CLOSE_WRITE)) {
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reload = true;
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} else if (e->wd == arl->wd_file && (e->mask & IN_DELETE_SELF)) {
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rm_watch(arl->fd, &arl->wd_file);
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} else if (e->wd == arl->wd_dir && (e->mask & (IN_CREATE | IN_MOVED_TO))) {
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if (STREQ(e->name, arl->filename))
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reload = true;
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}
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}
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}
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return reload;
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}
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#else
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void arl_init(arl_t *arl)
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{
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arl->fd = -1;
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}
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void arl_cleanup(arl_t *arl)
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{
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(void) arl;
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}
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void arl_add(arl_t *arl, const char *filepath)
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{
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(void) arl;
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(void) filepath;
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}
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bool arl_handle(arl_t *arl)
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{
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(void) arl;
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return false;
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}
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#endif /* HAVE_INOTIFY */
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