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     event_fd_handler *handler;
  21 } Fifo_Menu_Data;
  22
  23 #define FIFO_MENU(m) ((ObMenu *)m)
  24 #define FIFO_MENU_DATA(m) ((Fifo_Menu_Data *)((ObMenu *)m)->plugin_data)
  25
  26
  27 void fifo_menu_clean_up(ObMenu *m) {
  28     if (FIFO_MENU_DATA(m)->buf != NULL) {
  29         g_free(FIFO_MENU_DATA(m)->buf);
  30         FIFO_MENU_DATA(m)->buf = NULL;
  31         FIFO_MENU_DATA(m)->buflen = 0;
  32     }
  33
  34     if (FIFO_MENU_DATA(m)->fd != -1) {
  35         close(FIFO_MENU_DATA(m)->fd);
  36         FIFO_MENU_DATA(m)->fd = -1;
  37     }
  38 }
  39
  40 void plugin_setup_config() { }
  41 void plugin_startup()
  42 { }
  43 void plugin_shutdown() { }
  44
  45 void fifo_menu_handler(int fd, void *d) {
  46     ObMenu *menu = d;
  47     char *tmpbuf = NULL;
  48     unsigned long num_read;
  49 #ifdef DEBUG
  50     /* because gdb is dumb */
  51 #if 0
  52     Fifo_Menu_Data *d = FIFO_MENU_DATA(menu);
  53 #endif
  54 #endif
  55
  56     /* if the menu is shown this will go into busy loop :(
  57      fix me*/
  58     if (!menu->shown) {
  59         unsigned long num_realloc;
  60         /* if we have less than a quarter BUFSIZ left, allocate more */
  61         num_realloc = (BUFSIZ - (FIFO_MENU_DATA(menu)->buflen % BUFSIZ) <
  62                        BUFSIZ >> 2) ?
  63             0 : BUFSIZ;
  64
  65         tmpbuf = g_try_realloc(FIFO_MENU_DATA(menu)->buf,
  66                                FIFO_MENU_DATA(menu)->buflen + num_realloc);
  67
  68         if (tmpbuf == NULL) {
  69             g_warning("Unable to allocate memory for read()");
  70             return;
  71         }
  72
  73         FIFO_MENU_DATA(menu)->buf = tmpbuf;
  74
  75         num_read = read(fd,
  76                         FIFO_MENU_DATA(menu)->buf + FIFO_MENU_DATA(menu)->buflen,
  77                         num_realloc);
  78
  79         if (num_read == 0) { /* eof */
  80             unsigned long count = 0;
  81             char *found = NULL;
  82
  83             menu->invalid = TRUE;
  84             menu_clear(menu);
  85
  86             /* TEMP: list them */
  87             while (NULL !=
  88                    (found = strchr(&FIFO_MENU_DATA(menu)->buf[count], '\n'))) {
  89                 FIFO_MENU_DATA(menu)->buf
  90                     [found - FIFO_MENU_DATA(menu)->buf] = '\0';
  91                 menu_add_entry(menu,
  92                                menu_entry_new_separator
  93                                (&FIFO_MENU_DATA(menu)->buf[count]));
  94                 count = found - FIFO_MENU_DATA(menu)->buf + 1;
  95             }
  96
  97             FIFO_MENU_DATA(menu)->buf[FIFO_MENU_DATA(menu)->buflen] = '\0';
  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, O_NONBLOCK | O_RDONLY)) == -1) {
 104                 g_warning("Can't reopen FIFO");
 105                 fifo_menu_clean_up(menu);
 106                 return;
 107             }
 108
 109             FIFO_MENU_DATA(menu)->handler->fd = FIFO_MENU_DATA(menu)->fd;
 110
 111             event_add_fd_handler(FIFO_MENU_DATA(menu)->handler);
 112         } else if (num_read > 0) {
 113             FIFO_MENU_DATA(menu)->buflen += num_read;
 114             FIFO_MENU_DATA(menu)->buf[FIFO_MENU_DATA(menu)->buflen] = '\0';
 115         }
 116     }
 117 }
 118
 119 void plugin_destroy (ObMenu *m)
 120 {
 121     fifo_menu_clean_up(m);
 122     if (FIFO_MENU_DATA(m)->handler != NULL) {
 123         g_free(FIFO_MENU_DATA(m)->handler);
 124         FIFO_MENU_DATA(m)->handler = NULL;
 125     }
 126
 127     if (FIFO_MENU_DATA(m)->fifo != NULL) {
 128         g_free(FIFO_MENU_DATA(m)->fifo);
 129         FIFO_MENU_DATA(m)->fifo = NULL;
 130     }
 131
 132     g_free(m->plugin_data);
 133
 134     menu_free(m->name);
 135 }
 136
 137 void *plugin_create() /* TODO: need config */
 138 {
 139     char *fifo;
 140     char *dir;
 141     event_fd_handler *h;
 142
 143     Fifo_Menu_Data *d = g_new(Fifo_Menu_Data, 1);
 144     ObMenu *m = menu_new("", PLUGIN_NAME, NULL);
 145
 146     d->fd = -1;
 147     d->buf = NULL;
 148     d->buflen = 0;
 149     d->handler = NULL;
 150
 151     m->plugin = PLUGIN_NAME;
 152
 153     d->fd = -1;
 154
 155     m->plugin_data = (void *)d;
 156
 157     dir = g_build_filename(g_get_home_dir(), ".openbox", PLUGIN_NAME, NULL);
 158
 159     if (mkdir(dir, S_IRWXU | S_IRWXG | S_IRWXO) == -1 && errno != EEXIST) {
 160 /* technically, if ~/.openbox/fifo_menu exists and isn't a directory
 161    this will fail, but we don't care because mkfifo will fail and warn
 162    anyway */
 163         g_warning("Can't create %s: %s", dir, strerror(errno));
 164         g_free(dir);
 165         plugin_destroy(m);
 166         return NULL;
 167     }
 168
 169     fifo = g_build_filename(g_get_home_dir(), ".openbox", PLUGIN_NAME,
 170                             m->name, NULL);
 171     if (mkfifo(fifo, S_IRUSR | S_IWUSR |
 172                S_IRGRP | S_IWGRP | /* let umask do its thing */
 173                S_IROTH | S_IWOTH) == -1 && errno != EEXIST) {
 174         g_warning("Can't create FIFO %s: %s", fifo, strerror(errno));
 175         g_free(fifo);
 176         g_free(d);
 177         menu_free(m->name);
 178         return NULL;
 179     }
 180
 181 /* open in non-blocking mode so we don't wait for a process to open FIFO
 182    for writing */
 183     if ((d->fd = open(fifo, O_NONBLOCK | O_RDONLY)) == -1) {
 184         g_warning("Can't open FIFO %s: %s", fifo, strerror(errno));
 185         g_free(fifo);
 186         g_free(d);
 187         menu_free(m->name);
 188         return NULL;
 189     }
 190
 191     d->fifo = fifo;
 192
 193     h = g_new(event_fd_handler, 1);
 194
 195     if (h == NULL) {
 196         g_warning("Out of memory");
 197         close(d->fd);
 198         g_free(fifo);
 199         g_free(d);
 200         menu_free(m->name);
 201         return NULL;
 202     }
 203
 204     h->fd = d->fd;
 205     h->data = m;
 206     h->handler = fifo_menu_handler;
 207     d->handler = h;
 208
 209     event_add_fd_handler(h);
 210
 211     g_free(dir);
 212     return (void *)m;
 213 }