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             xmlDocPtr doc;
  83             xmlNodePtr node;
  84
  85             menu->invalid = TRUE;
  86             menu_clear(menu);
  87
  88             FIFO_MENU_DATA(menu)->buf[FIFO_MENU_DATA(menu)->buflen] = '\0';
  89
  90             doc = xmlParseMemory(FIFO_MENU_DATA(menu)->buf,
  91                                  FIFO_MENU_DATA(menu)->buflen);
  92
  93             node = xmlDocGetRootElement(doc);
  94
  95             if (node &&
  96                 !xmlStrcasecmp(node->name, (const xmlChar*) "fifo_menu")) {
  97                 if ((node = parse_find_node("item", node->xmlChildrenNode)))
  98                     parse_menu_full(doc, node, menu, FALSE);
  99             }
 100
 101             fifo_menu_clean_up(menu);
 102
 103             event_remove_fd(FIFO_MENU_DATA(menu)->handler->fd);
 104
 105             if ((FIFO_MENU_DATA(menu)->fd =
 106                  open(FIFO_MENU_DATA(menu)->fifo,
 107                       O_NONBLOCK | O_RDONLY)) == -1) {
 108                 g_warning("Can't reopen FIFO");
 109                 fifo_menu_clean_up(menu);
 110                 return;
 111             }
 112
 113             FIFO_MENU_DATA(menu)->handler->fd = FIFO_MENU_DATA(menu)->fd;
 114
 115             event_add_fd_handler(FIFO_MENU_DATA(menu)->handler);
 116         } else if (num_read > 0) {
 117             FIFO_MENU_DATA(menu)->buflen += num_read;
 118             FIFO_MENU_DATA(menu)->buf[FIFO_MENU_DATA(menu)->buflen] = '\0';
 119         }
 120     }
 121 }
 122
 123 void plugin_destroy (ObMenu *m)
 124 {
 125     fifo_menu_clean_up(m);
 126     if (FIFO_MENU_DATA(m)->handler != NULL) {
 127         g_free(FIFO_MENU_DATA(m)->handler);
 128         FIFO_MENU_DATA(m)->handler = NULL;
 129     }
 130
 131     if (FIFO_MENU_DATA(m)->fifo != NULL) {
 132         g_free(FIFO_MENU_DATA(m)->fifo);
 133         FIFO_MENU_DATA(m)->fifo = NULL;
 134     }
 135
 136     g_free(m->plugin_data);
 137
 138     menu_free(m->name);
 139 }
 140
 141 void *plugin_create(PluginMenuCreateData *data)
 142 {
 143     char *fifo;
 144     char *dir;
 145     event_fd_handler *h;
 146     Fifo_Menu_Data *d;
 147     ObMenu *m;
 148     char *label = NULL, *id = NULL;
 149     char *attr_pid = NULL;
 150
 151     d = g_new(Fifo_Menu_Data, 1);
 152
 153     parse_attr_string("id", data->node, &id);
 154     parse_attr_string("label", data->node, &label);
 155
 156     if (parse_attr_string("pid", data->node, &attr_pid) &&
 157         g_strcasecmp(attr_pid, "true") == 0) {
 158         d->use_pid = TRUE;
 159     } else
 160         d->use_pid = FALSE;
 161
 162     m = menu_new( (label != NULL ? label : ""),
 163                   (id != NULL ? id : PLUGIN_NAME),
 164                   data->parent);
 165     menu_add_entry(data->parent, menu_entry_new_submenu(
 166                        (label != NULL ? label : ""),
 167                        m));
 168
 169     g_free(label);
 170     g_free(id);
 171     d->fd = -1;
 172     d->buf = NULL;
 173     d->buflen = 0;
 174     d->handler = NULL;
 175
 176     m->plugin = PLUGIN_NAME;
 177
 178     d->fd = -1;
 179
 180     m->plugin_data = (void *)d;
 181
 182
 183     dir = g_build_filename(g_get_home_dir(), ".openbox",
 184                           PLUGIN_NAME, NULL);
 185
 186     if (mkdir(dir, S_IRWXU | S_IRWXG | S_IRWXO) == -1 && errno != EEXIST) {
 187 /* technically, if ~/.openbox/fifo_menu exists and isn't a directory
 188    this will fail, but we don't care because mkfifo will fail and warn
 189    anyway */
 190         g_warning("Can't create %s: %s", dir, strerror(errno));
 191         g_free(dir);
 192         plugin_destroy(m);
 193         return NULL;
 194     }
 195
 196     if (d->use_pid)
 197     {
 198         char *pid = g_strdup_printf("%s.%d", m->name, getpid());
 199         fifo = g_build_filename(g_get_home_dir(), ".openbox",
 200                                 PLUGIN_NAME,
 201                                 pid, NULL);
 202         g_free(pid);
 203     } else {
 204         fifo = g_build_filename(g_get_home_dir(), ".openbox",
 205                                 PLUGIN_NAME,
 206                                 m->name, NULL);
 207     }
 208
 209     if (mkfifo(fifo, S_IRUSR | S_IWUSR |
 210                S_IRGRP | S_IWGRP | /* let umask do its thing */
 211                S_IROTH | S_IWOTH) == -1 && errno != EEXIST) {
 212         g_warning("Can't create FIFO %s: %s", fifo, strerror(errno));
 213         g_free(fifo);
 214         g_free(d);
 215         menu_free(m->name);
 216         return NULL;
 217     }
 218
 219 /* open in non-blocking mode so we don't wait for a process to open FIFO
 220    for writing */
 221     if ((d->fd = open(fifo, O_NONBLOCK | O_RDONLY)) == -1) {
 222         g_warning("Can't open FIFO %s: %s", fifo, strerror(errno));
 223         g_free(fifo);
 224         g_free(d);
 225         menu_free(m->name);
 226         return NULL;
 227     }
 228
 229     d->fifo = fifo;
 230
 231     h = g_new(event_fd_handler, 1);
 232
 233     if (h == NULL) {
 234         g_warning("Out of memory");
 235         close(d->fd);
 236         g_free(fifo);
 237         g_free(d);
 238         menu_free(m->name);
 239         return NULL;
 240     }
 241
 242     h->fd = d->fd;
 243     h->data = m;
 244     h->handler = fifo_menu_handler;
 245     d->handler = h;
 246
 247     event_add_fd_handler(h);
 248
 249     g_free(dir);
 250     return (void *)m;
 251 }