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) ((Menu *)m)
  24 #define FIFO_MENU_DATA(m) ((Fifo_Menu_Data *)((Menu *)m)->plugin_data)
  25
  26
  27 void fifo_menu_clean_up(Menu *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, Menu *menu) {
  46     char *tmpbuf = NULL;
  47     unsigned long num_read;
  48 #ifdef DEBUG
  49     /* because gdb is dumb */
  50     Fifo_Menu_Data *d = FIFO_MENU_DATA(menu);
  51 #endif
  52
  53     /* if the menu is shown this will go into busy loop :(
  54      fix me*/
  55     if (!menu->shown) {
  56         unsigned long num_realloc;
  57         /* if we have less than a quarter BUFSIZ left, allocate more */
  58         num_realloc = (BUFSIZ - (FIFO_MENU_DATA(menu)->buflen % BUFSIZ) <
  59                        BUFSIZ >> 2) ?
  60             0 : BUFSIZ;
  61
  62         tmpbuf = g_try_realloc(FIFO_MENU_DATA(menu)->buf,
  63                                FIFO_MENU_DATA(menu)->buflen + num_realloc);
  64
  65         if (tmpbuf == NULL) {
  66             g_warning("Unable to allocate memory for read()");
  67             return;
  68         }
  69
  70         FIFO_MENU_DATA(menu)->buf = tmpbuf;
  71
  72         num_read = read(fd,
  73                         FIFO_MENU_DATA(menu)->buf + FIFO_MENU_DATA(menu)->buflen,
  74                         num_realloc);
  75
  76         if (num_read == 0) { /* eof */
  77             unsigned long count = 0;
  78             char *found = NULL;
  79
  80             menu->invalid = TRUE;
  81             menu_clear(menu);
  82
  83             /* TEMP: list them */
  84             while (NULL !=
  85                    (found = strchr(&FIFO_MENU_DATA(menu)->buf[count], '\n'))) {
  86                 FIFO_MENU_DATA(menu)->buf
  87                     [found - FIFO_MENU_DATA(menu)->buf] = '\0';
  88                 menu_add_entry(menu,
  89                                menu_entry_new_separator
  90                                (&FIFO_MENU_DATA(menu)->buf[count]));
  91                 count = found - FIFO_MENU_DATA(menu)->buf + 1;
  92             }
  93
  94             FIFO_MENU_DATA(menu)->buf[FIFO_MENU_DATA(menu)->buflen] = '\0';
  95             fifo_menu_clean_up(menu);
  96
  97             event_remove_fd(FIFO_MENU_DATA(menu)->handler->fd);
  98
  99             if ((FIFO_MENU_DATA(menu)->fd =
 100                  open(FIFO_MENU_DATA(menu)->fifo, O_NONBLOCK | O_RDONLY)) == -1) {
 101                 g_warning("Can't reopen FIFO");
 102                 fifo_menu_clean_up(menu);
 103                 return;
 104             }
 105
 106             FIFO_MENU_DATA(menu)->handler->fd = FIFO_MENU_DATA(menu)->fd;
 107
 108             event_add_fd_handler(FIFO_MENU_DATA(menu)->handler);
 109         } else if (num_read > 0) {
 110             FIFO_MENU_DATA(menu)->buflen += num_read;
 111             FIFO_MENU_DATA(menu)->buf[FIFO_MENU_DATA(menu)->buflen] = '\0';
 112         }
 113     }
 114 }
 115
 116 void plugin_destroy (Menu *m)
 117 {
 118     fifo_menu_clean_up(m);
 119     if (FIFO_MENU_DATA(m)->handler != NULL) {
 120         g_free(FIFO_MENU_DATA(m)->handler);
 121         FIFO_MENU_DATA(m)->handler = NULL;
 122     }
 123
 124     if (FIFO_MENU_DATA(m)->fifo != NULL) {
 125         g_free(FIFO_MENU_DATA(m)->fifo);
 126         FIFO_MENU_DATA(m)->fifo = NULL;
 127     }
 128
 129     g_free(m->plugin_data);
 130
 131     menu_free(m->name);
 132 }
 133
 134 void *plugin_create() /* TODO: need config */
 135 {
 136     char *fifo;
 137     char *dir;
 138     event_fd_handler *h;
 139
 140     Fifo_Menu_Data *d = g_new(Fifo_Menu_Data, 1);
 141     Menu *m = menu_new("", PLUGIN_NAME, NULL);
 142
 143     d->fd = -1;
 144     d->buf = NULL;
 145     d->buflen = 0;
 146     d->handler = NULL;
 147
 148     m->plugin = PLUGIN_NAME;
 149
 150     d->fd = -1;
 151
 152     m->plugin_data = (void *)d;
 153
 154     dir = g_build_filename(g_get_home_dir(), ".openbox", PLUGIN_NAME, NULL);
 155
 156     if (mkdir(dir, S_IRWXU | S_IRWXG | S_IRWXO) == -1 && errno != EEXIST) {
 157 /* technically, if ~/.openbox/fifo_menu exists and isn't a directory
 158    this will fail, but we don't care because mkfifo will fail and warn
 159    anyway */
 160         g_warning("Can't create %s: %s", dir, strerror(errno));
 161         g_free(dir);
 162         plugin_destroy(m);
 163         return NULL;
 164     }
 165
 166     fifo = g_build_filename(g_get_home_dir(), ".openbox", PLUGIN_NAME,
 167                             m->name, NULL);
 168     if (mkfifo(fifo, S_IRUSR | S_IWUSR |
 169                S_IRGRP | S_IWGRP | /* let umask do its thing */
 170                S_IROTH | S_IWOTH) == -1 && errno != EEXIST) {
 171         g_warning("Can't create FIFO %s: %s", fifo, strerror(errno));
 172         g_free(fifo);
 173         g_free(d);
 174         menu_free(m->name);
 175         return NULL;
 176     }
 177
 178 /* open in non-blocking mode so we don't wait for a process to open FIFO
 179    for writing */
 180     if ((d->fd = open(fifo, O_NONBLOCK | O_RDONLY)) == -1) {
 181         g_warning("Can't open FIFO %s: %s", fifo, strerror(errno));
 182         g_free(fifo);
 183         g_free(d);
 184         menu_free(m->name);
 185         return NULL;
 186     }
 187
 188     d->fifo = fifo;
 189
 190     h = g_new(event_fd_handler, 1);
 191
 192     if (h == NULL) {
 193         g_warning("Out of memory");
 194         close(d->fd);
 195         g_free(fifo);
 196         g_free(d);
 197         menu_free(m->name);
 198         return NULL;
 199     }
 200
 201     h->fd = d->fd;
 202     h->data = m;
 203     h->handler = fifo_menu_handler;
 204     d->handler = h;
 205
 206     event_add_fd_handler(h);
 207
 208     g_free(dir);
 209     return (void *)m;
 210 }