Dogcows Code - chaz/openbox/blob - plugins/menu/fifo_menu.c

   1 #include <glib.h>
   2 #include <sys/types.h>
   3 #include <sys/stat.h>
   4 #include <errno.h>
   5 #include <fcntl.h>
   6 #include <unistd.h>
   7 #include <string.h>
   8 #include <stdio.h>
   9
  10 #include "kernel/menu.h"
  11 #include "kernel/event.h"
  12
  13 static char *PLUGIN_NAME = "fifo_menu";
  14
  15 typedef struct Fifo_Menu_Data {
  16     char *fifo;
  17     char *buf; /* buffer to hold partially read menu */
  18     unsigned long buflen; /* how many bytes are in the buffer */
  19     int fd; /* file descriptor to read menu from */
  20     gboolean use_pid;
  21     event_fd_handler *handler;
  22 } Fifo_Menu_Data;
  23
  24 #define FIFO_MENU(m) ((ObMenu *)m)
  25 #define FIFO_MENU_DATA(m) ((Fifo_Menu_Data *)((ObMenu *)m)->plugin_data)
  26
  27
  28 void fifo_menu_clean_up(ObMenu *m) {
  29     if (FIFO_MENU_DATA(m)->buf != NULL) {
  30         g_free(FIFO_MENU_DATA(m)->buf);
  31         FIFO_MENU_DATA(m)->buf = NULL;
  32         FIFO_MENU_DATA(m)->buflen = 0;
  33     }
  34
  35     if (FIFO_MENU_DATA(m)->fd != -1) {
  36         close(FIFO_MENU_DATA(m)->fd);
  37         FIFO_MENU_DATA(m)->fd = -1;
  38     }
  39 }
  40
  41 void plugin_setup_config() { }
  42 void plugin_startup()
  43 { }
  44 void plugin_shutdown() { }
  45
  46 void fifo_menu_handler(int fd, void *d) {
  47     ObMenu *menu = d;
  48     char *tmpbuf = NULL;
  49     unsigned long num_read;
  50 #ifdef DEBUG
  51     /* because gdb is dumb */
  52 #if 0
  53     Fifo_Menu_Data *d = FIFO_MENU_DATA(menu);
  54 #endif
  55 #endif
  56
  57     /* if the menu is shown this will go into busy loop :(
  58      fix me*/
  59     if (!menu->shown) {
  60         unsigned long num_realloc;
  61         /* if we have less than a quarter BUFSIZ left, allocate more */
  62         num_realloc = (BUFSIZ - (FIFO_MENU_DATA(menu)->buflen % BUFSIZ) <
  63                        BUFSIZ >> 2) ?
  64             0 : BUFSIZ;
  65
  66         tmpbuf = g_try_realloc(FIFO_MENU_DATA(menu)->buf,
  67                                FIFO_MENU_DATA(menu)->buflen + num_realloc);
  68
  69         if (tmpbuf == NULL) {
  70             g_warning("Unable to allocate memory for read()");
  71             return;
  72         }
  73
  74         FIFO_MENU_DATA(menu)->buf = tmpbuf;
  75
  76         num_read = read(fd,
  77                         FIFO_MENU_DATA(menu)->buf +
  78                         FIFO_MENU_DATA(menu)->buflen,
  79                         num_realloc);
  80
  81         if (num_read == 0) { /* eof */
  82             menu->invalid = TRUE;
  83             menu_clear(menu);
  84
  85             FIFO_MENU_DATA(menu)->buf[FIFO_MENU_DATA(menu)->buflen] = '\0';
  86
  87             xmlDocPtr doc = xmlParseMemory(FIFO_MENU_DATA(menu)->buf,
  88                                            FIFO_MENU_DATA(menu)->buflen);
  89
  90             xmlNodePtr node = xmlDocGetRootElement(doc);
  91
  92             if (node &&
  93                 !xmlStrcasecmp(node->name, (const xmlChar*) "fifo_menu")) {
  94                 if ((node = parse_find_node("item", node->xmlChildrenNode)))
  95                     parse_menu_full(doc, node, menu, FALSE);
  96             }
  97
  98             fifo_menu_clean_up(menu);
  99
 100             event_remove_fd(FIFO_MENU_DATA(menu)->handler->fd);
 101
 102             if ((FIFO_MENU_DATA(menu)->fd =
 103                  open(FIFO_MENU_DATA(menu)->fifo,
 104                       O_NONBLOCK | O_RDONLY)) == -1) {
 105                 g_warning("Can't reopen FIFO");
 106                 fifo_menu_clean_up(menu);
 107                 return;
 108             }
 109
 110             FIFO_MENU_DATA(menu)->handler->fd = FIFO_MENU_DATA(menu)->fd;
 111
 112             event_add_fd_handler(FIFO_MENU_DATA(menu)->handler);
 113         } else if (num_read > 0) {
 114             FIFO_MENU_DATA(menu)->buflen += num_read;
 115             FIFO_MENU_DATA(menu)->buf[FIFO_MENU_DATA(menu)->buflen] = '\0';
 116         }
 117     }
 118 }
 119
 120 void plugin_destroy (ObMenu *m)
 121 {
 122     fifo_menu_clean_up(m);
 123     if (FIFO_MENU_DATA(m)->handler != NULL) {
 124         g_free(FIFO_MENU_DATA(m)->handler);
 125         FIFO_MENU_DATA(m)->handler = NULL;
 126     }
 127
 128     if (FIFO_MENU_DATA(m)->fifo != NULL) {
 129         g_free(FIFO_MENU_DATA(m)->fifo);
 130         FIFO_MENU_DATA(m)->fifo = NULL;
 131     }
 132
 133     g_free(m->plugin_data);
 134
 135     menu_free(m->name);
 136 }
 137
 138 void *plugin_create(PluginMenuCreateData *data)
 139 {
 140     char *fifo;
 141     char *dir;
 142     event_fd_handler *h;
 143     Fifo_Menu_Data *d;
 144     ObMenu *m;
 145     char *label = NULL, *id = NULL;
 146     char *attr_pid = NULL;
 147
 148     d = g_new(Fifo_Menu_Data, 1);
 149
 150     parse_attr_string("id", data->node, &id);
 151     parse_attr_string("label", data->node, &label);
 152
 153     if (parse_attr_string("pid", data->node, &attr_pid) &&
 154         g_strcasecmp(attr_pid, "true") == 0) {
 155         d->use_pid = TRUE;
 156     } else
 157         d->use_pid = FALSE;
 158
 159     m = menu_new( (label != NULL ? label : ""),
 160                   (id != NULL ? id : PLUGIN_NAME),
 161                   data->parent);
 162     menu_add_entry(data->parent, menu_entry_new_submenu(
 163                        (label != NULL ? label : ""),
 164                        m));
 165
 166     g_free(label);
 167     g_free(id);
 168     d->fd = -1;
 169     d->buf = NULL;
 170     d->buflen = 0;
 171     d->handler = NULL;
 172
 173     m->plugin = PLUGIN_NAME;
 174
 175     d->fd = -1;
 176
 177     m->plugin_data = (void *)d;
 178
 179
 180     dir = g_build_filename(g_get_home_dir(), ".openbox",
 181                           PLUGIN_NAME, NULL);
 182
 183     if (mkdir(dir, S_IRWXU | S_IRWXG | S_IRWXO) == -1 && errno != EEXIST) {
 184 /* technically, if ~/.openbox/fifo_menu exists and isn't a directory
 185    this will fail, but we don't care because mkfifo will fail and warn
 186    anyway */
 187         g_warning("Can't create %s: %s", dir, strerror(errno));
 188         g_free(dir);
 189         plugin_destroy(m);
 190         return NULL;
 191     }
 192
 193     if (d->use_pid)
 194     {
 195         char *pid = g_strdup_printf("%s.%d", m->name, getpid());
 196         fifo = g_build_filename(g_get_home_dir(), ".openbox",
 197                                 PLUGIN_NAME,
 198                                 pid, NULL);
 199         g_free(pid);
 200     } else {
 201         fifo = g_build_filename(g_get_home_dir(), ".openbox",
 202                                 PLUGIN_NAME,
 203                                 m->name, NULL);
 204     }
 205
 206     if (mkfifo(fifo, S_IRUSR | S_IWUSR |
 207                S_IRGRP | S_IWGRP | /* let umask do its thing */
 208                S_IROTH | S_IWOTH) == -1 && errno != EEXIST) {
 209         g_warning("Can't create FIFO %s: %s", fifo, strerror(errno));
 210         g_free(fifo);
 211         g_free(d);
 212         menu_free(m->name);
 213         return NULL;
 214     }
 215
 216 /* open in non-blocking mode so we don't wait for a process to open FIFO
 217    for writing */
 218     if ((d->fd = open(fifo, O_NONBLOCK | O_RDONLY)) == -1) {
 219         g_warning("Can't open FIFO %s: %s", fifo, strerror(errno));
 220         g_free(fifo);
 221         g_free(d);
 222         menu_free(m->name);
 223         return NULL;
 224     }
 225
 226     d->fifo = fifo;
 227
 228     h = g_new(event_fd_handler, 1);
 229
 230     if (h == NULL) {
 231         g_warning("Out of memory");
 232         close(d->fd);
 233         g_free(fifo);
 234         g_free(d);
 235         menu_free(m->name);
 236         return NULL;
 237     }
 238
 239     h->fd = d->fd;
 240     h->data = m;
 241     h->handler = fifo_menu_handler;
 242     d->handler = h;
 243
 244     event_add_fd_handler(h);
 245
 246     g_free(dir);
 247     return (void *)m;
 248 }