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

   1 #include <glib.h>
   2 #include <stdlib.h>
   3 #include <unistd.h>
   4 #include <errno.h>
   5 #include <string.h>
   6 #include <stdio.h>
   7 #include <sys/types.h>
   8 #include <sys/wait.h>
   9 #include <unistd.h>
  10 #include <sys/stat.h>
  11
  12 #include "kernel/menu.h"
  13 #include "kernel/timer.h"
  14 #include "timed_menu.h"
  15 #include "kernel/action.h"
  16 #include "kernel/event.h"
  17
  18 #define TIMED_MENU(m) ((Menu *)m)
  19 #define TIMED_MENU_DATA(m) ((Timed_Menu_Data *)((Menu *)m)->plugin_data)
  20 static char *PLUGIN_NAME = "timed_menu";
  21
  22 typedef enum {
  23     TIMED_MENU_PIPE, /* read entries from a child process' output */
  24     TIMED_MENU_STAT  /* reread entries from file when timestamp changes */
  25 } Timed_Menu_Type;
  26
  27 typedef struct {
  28     Timed_Menu_Type type;
  29     Timer *timer;
  30     char *command; /* for the PIPE */
  31     char *buf; /* buffer to hold partially read menu */
  32     unsigned long buflen; /* how many bytes are in the buffer */
  33     int fd; /* file descriptor to read menu from */
  34     pid_t pid; /* pid of child process in PIPE */
  35     time_t mtime; /* time of last modification */
  36 } Timed_Menu_Data;
  37
  38
  39 void plugin_setup_config() { }
  40 void plugin_startup()
  41 { }
  42 void plugin_shutdown() { }
  43
  44 void timed_menu_clean_up(Menu *m) {
  45     if (TIMED_MENU_DATA(m)->buf != NULL) {
  46         fprintf(stderr, "%s", TIMED_MENU_DATA(m)->buf);
  47         g_free(TIMED_MENU_DATA(m)->buf);
  48         TIMED_MENU_DATA(m)->buf = NULL;
  49     }
  50
  51     TIMED_MENU_DATA(m)->buflen = 0;
  52
  53     if (TIMED_MENU_DATA(m)->fd != -1) {
  54         event_remove_fd(TIMED_MENU_DATA(m)->fd);
  55         close(TIMED_MENU_DATA(m)->fd);
  56         TIMED_MENU_DATA(m)->fd = -1;
  57     }
  58
  59     if (TIMED_MENU_DATA(m)->pid != -1) {
  60         waitpid(TIMED_MENU_DATA(m)->pid, NULL, 0);
  61         TIMED_MENU_DATA(m)->pid = -1;
  62     }
  63
  64     TIMED_MENU_DATA(m)->mtime = 0;
  65 }
  66
  67 void timed_menu_read_pipe(int fd, Menu *menu)
  68 {
  69     char *tmpbuf = NULL;
  70     unsigned long num_read;
  71 #ifdef DEBUG
  72     /* because gdb is dumb */
  73     Timed_Menu_Data *d = TIMED_MENU_DATA(menu);
  74 #endif
  75
  76     unsigned long num_realloc;
  77     /* if we have less than a quarter BUFSIZ left, allocate more */
  78     num_realloc = (BUFSIZ - (TIMED_MENU_DATA(menu)->buflen % BUFSIZ) <
  79                    BUFSIZ >> 2) ?
  80                   0 : BUFSIZ;
  81
  82     tmpbuf = g_try_realloc(TIMED_MENU_DATA(menu)->buf,
  83                            TIMED_MENU_DATA(menu)->buflen + num_realloc);
  84
  85     if (tmpbuf == NULL) {
  86         g_warning("Unable to allocate memory for read()");
  87         return;
  88     }
  89
  90     TIMED_MENU_DATA(menu)->buf = tmpbuf;
  91
  92     num_read = read(fd,
  93                     TIMED_MENU_DATA(menu)->buf + TIMED_MENU_DATA(menu)->buflen,
  94                     num_realloc);
  95     if (num_read == 0) {
  96         unsigned long count = 0;
  97         char *found = NULL;
  98         menu->invalid = TRUE;
  99         menu_clear(menu);
 100
 101         /* TEMP: list them */
 102         while (NULL !=
 103                (found = strchr(&TIMED_MENU_DATA(menu)->buf[count], '\n'))) {
 104             TIMED_MENU_DATA(menu)->buf
 105                 [found - TIMED_MENU_DATA(menu)->buf] = '\0';
 106             menu_add_entry(menu,
 107                 menu_entry_new_separator
 108                 (&TIMED_MENU_DATA(menu)->buf[count]));
 109             count = found - TIMED_MENU_DATA(menu)->buf + 1;
 110         }
 111
 112         TIMED_MENU_DATA(menu)->buf[TIMED_MENU_DATA(menu)->buflen] = '\0';
 113         timed_menu_clean_up(menu);
 114     } else if (num_read > 0) {
 115         TIMED_MENU_DATA(menu)->buflen += num_read;
 116         TIMED_MENU_DATA(menu)->buf[TIMED_MENU_DATA(menu)->buflen] = '\0';
 117     } else { /* num_read < 1 */
 118         g_warning("Error on read %s", strerror(errno));
 119         timed_menu_clean_up(menu);
 120     }
 121 }
 122
 123 void timed_menu_timeout_handler(Menu *data)
 124 {
 125     Action *a;
 126
 127     if (!data->shown && TIMED_MENU_DATA(data)->fd == -1) {
 128         switch (TIMED_MENU_DATA(data)->type) {
 129             case (TIMED_MENU_PIPE): {
 130                 /* if the menu is not shown, run a process and use its output
 131                    as menu */
 132
 133                 /* I hate you glib in all your hideous forms */
 134                 char *args[] = {"/bin/sh", "-c", TIMED_MENU_DATA(data)->command,
 135                                 NULL};
 136                 int child_stdout;
 137                 int child_pid;
 138                 if (g_spawn_async_with_pipes(
 139                         NULL,
 140                         args,
 141                         NULL,
 142                         G_SPAWN_SEARCH_PATH | G_SPAWN_DO_NOT_REAP_CHILD,
 143                         NULL,
 144                         NULL,
 145                         &child_pid,
 146                         NULL,
 147                         &child_stdout,
 148                         NULL,
 149                         NULL)) {
 150                     event_fd_handler *h = g_new(event_fd_handler, 1);
 151                     TIMED_MENU_DATA(data)->fd = h->fd = child_stdout;
 152                     TIMED_MENU_DATA(data)->pid = child_pid;
 153                     h->handler = timed_menu_read_pipe;
 154                     h->data = data;
 155                     event_add_fd_handler(h);
 156                 } else {
 157                     g_warning("unable to spawn child");
 158                 }
 159                 break;
 160             }
 161
 162             case (TIMED_MENU_STAT): {
 163                 struct stat stat_buf;
 164
 165                 if (stat(TIMED_MENU_DATA(data)->command, &stat_buf) == -1) {
 166                     g_warning("Unable to stat %s: %s",
 167                               TIMED_MENU_DATA(data)->command,
 168                               strerror(errno));
 169                     break;
 170                 }
 171
 172                 if (stat_buf.st_mtime > TIMED_MENU_DATA(data)->mtime) {
 173                     g_warning("file changed");
 174                     TIMED_MENU_DATA(data)->mtime = stat_buf.st_mtime;
 175                     /* TODO: parse */
 176                 }
 177             }
 178         }
 179     }
 180 }
 181
 182 void *plugin_create()
 183 {
 184     Timed_Menu_Data *d = g_new(Timed_Menu_Data, 1);
 185     Menu *m = menu_new("", PLUGIN_NAME, NULL);
 186
 187     m->plugin = PLUGIN_NAME;
 188
 189     d->type = TIMED_MENU_STAT;
 190     d->timer = timer_start(6000000, &timed_menu_timeout_handler, m);
 191     d->command = "/home/woodblock/timed_menu_stat";
 192     d->buf = NULL;
 193     d->buflen = 0;
 194     d->fd = -1;
 195     d->pid = -1;
 196     d->mtime = 0;
 197
 198     m->plugin_data = (void *)d;
 199
 200     timed_menu_timeout_handler(m);
 201     return (void *)m;
 202 }
 203
 204 void plugin_destroy (void *m)
 205 {
 206     timed_menu_clean_up(m);
 207     /* this will be freed by timer_* */
 208     timer_stop( ((Timed_Menu_Data *)TIMED_MENU(m)->plugin_data)->timer);
 209
 210     g_free( TIMED_MENU(m)->plugin_data );
 211 }