| 1 | /* Copyright 2017 Max Voit |
| 2 | * |
| 3 | * This file is part of sxiv. |
| 4 | * |
| 5 | * sxiv is free software; you can redistribute it and/or modify |
| 6 | * it under the terms of the GNU General Public License as published |
| 7 | * by the Free Software Foundation; either version 2 of the License, |
| 8 | * or (at your option) any later version. |
| 9 | * |
| 10 | * sxiv is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU General Public License for more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License |
| 16 | * along with sxiv. If not, see <http://www.gnu.org/licenses/>. |
| 17 | */ |
| 18 | |
| 19 | #include <stdlib.h> |
| 20 | #include <string.h> |
| 21 | #include <unistd.h> |
| 22 | #include <sys/inotify.h> |
| 23 | #include <libgen.h> |
| 24 | #include <time.h> |
| 25 | |
| 26 | #include "util.h" |
| 27 | #include "autoreload.h" |
| 28 | |
| 29 | const struct timespec ten_ms = {0, 10000000}; |
| 30 | |
| 31 | void arl_cleanup(void) |
| 32 | { |
| 33 | if (autoreload.fd != -1 && autoreload.wd != -1) |
| 34 | { |
| 35 | if(inotify_rm_watch(autoreload.fd, autoreload.wd)) |
| 36 | error(0, 0, "Failed to remove inotify watch."); |
| 37 | } |
| 38 | } |
| 39 | |
| 40 | void arl_handle(void) |
| 41 | { |
| 42 | ssize_t len; |
| 43 | char buf[4096] __attribute__ ((aligned(__alignof__(struct inotify_event)))); |
| 44 | const struct inotify_event *event; |
| 45 | char *ptr; |
| 46 | char *fntmp, *fn; |
| 47 | |
| 48 | len = read(autoreload.fd, buf, sizeof buf); |
| 49 | if (len == -1) |
| 50 | { |
| 51 | error(0, 0, "Failed to read inotify events."); |
| 52 | return; |
| 53 | } |
| 54 | |
| 55 | for (ptr = buf; ptr < buf + len; |
| 56 | ptr += sizeof(struct inotify_event) + event->len) |
| 57 | { |
| 58 | |
| 59 | event = (const struct inotify_event *) ptr; |
| 60 | |
| 61 | /* events from watching the file itself */ |
| 62 | if (event->mask & IN_CLOSE_WRITE) |
| 63 | { |
| 64 | load_image(fileidx); |
| 65 | redraw(); |
| 66 | } |
| 67 | |
| 68 | if (event->mask & IN_DELETE_SELF) |
| 69 | arl_setup_dir(); |
| 70 | |
| 71 | /* events from watching the file's directory */ |
| 72 | if (event->mask & IN_CREATE) |
| 73 | { |
| 74 | fntmp = strdup(files[fileidx].path); |
| 75 | fn = basename(fntmp); |
| 76 | |
| 77 | if (0 == strcmp(event->name, fn)) |
| 78 | { |
| 79 | /* this is the file we're looking for */ |
| 80 | |
| 81 | /* cleanup, this has not been one-shot */ |
| 82 | if (autoreload.watching_dir) |
| 83 | { |
| 84 | if(inotify_rm_watch(autoreload.fd, autoreload.wd)) |
| 85 | error(0, 0, "Failed to remove inotify watch."); |
| 86 | autoreload.watching_dir = false; |
| 87 | } |
| 88 | |
| 89 | /* when too fast, imlib2 can't load the image */ |
| 90 | nanosleep(&ten_ms, NULL); |
| 91 | load_image(fileidx); |
| 92 | redraw(); |
| 93 | } |
| 94 | free(fntmp); |
| 95 | } |
| 96 | } |
| 97 | } |
| 98 | |
| 99 | void arl_init(void) |
| 100 | { |
| 101 | /* this needs to be done only once */ |
| 102 | autoreload.fd = inotify_init(); |
| 103 | autoreload.watching_dir = false; |
| 104 | if (autoreload.fd == -1) |
| 105 | error(0, 0, "Could not initialize inotify."); |
| 106 | } |
| 107 | |
| 108 | void arl_setup(void) |
| 109 | { |
| 110 | if (autoreload.fd == -1) |
| 111 | { |
| 112 | error(0, 0, "Uninitialized, could not add inotify watch."); |
| 113 | return; |
| 114 | } |
| 115 | |
| 116 | /* may have switched from a deleted to another image */ |
| 117 | if (autoreload.watching_dir) |
| 118 | { |
| 119 | if (inotify_rm_watch(autoreload.fd, autoreload.wd)) |
| 120 | error(0, 0, "Failed to remove inotify watch."); |
| 121 | autoreload.watching_dir = false; |
| 122 | } |
| 123 | |
| 124 | autoreload.wd = inotify_add_watch(autoreload.fd, files[fileidx].path, |
| 125 | IN_ONESHOT | IN_CLOSE_WRITE | IN_DELETE_SELF); |
| 126 | if (autoreload.wd == -1) |
| 127 | error(0, 0, "Failed to add inotify watch on file '%s'.", files[fileidx].path); |
| 128 | } |
| 129 | |
| 130 | void arl_setup_dir(void) |
| 131 | { |
| 132 | char *dntmp, *dn; |
| 133 | |
| 134 | if (autoreload.fd == -1) |
| 135 | { |
| 136 | error(0, 0, "Uninitialized, could not add inotify watch on directory."); |
| 137 | return; |
| 138 | } |
| 139 | |
| 140 | /* get dirname */ |
| 141 | dntmp = (char*) strdup(files[fileidx].path); |
| 142 | dn = (char*) dirname(dntmp); |
| 143 | |
| 144 | /* this is not one-shot as other stuff may be created too |
| 145 | note: we won't handle deletion of the directory itself, |
| 146 | this is a design decision */ |
| 147 | autoreload.wd = inotify_add_watch(autoreload.fd, dn,IN_CREATE); |
| 148 | if (autoreload.wd == -1) |
| 149 | error(0, 0, "Failed to add inotify watch on directory '%s'.", dn); |
| 150 | else |
| 151 | autoreload.watching_dir = true; |
| 152 | |
| 153 | free(dntmp); |
| 154 | } |