plugins/menu/timed_menu.c (raw)
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#include <glib.h> #include <stdlib.h> #include <unistd.h> #include <errno.h> #include <string.h> #include <stdio.h> #include <sys/types.h> #include <sys/wait.h> #include <unistd.h> #include <sys/stat.h> #include "kernel/menu.h" #include "kernel/timer.h" #include "timed_menu.h" #include "kernel/action.h" #include "kernel/event.h" #define TIMED_MENU(m) ((ObMenu *)m) #define TIMED_MENU_DATA(m) ((Timed_Menu_Data *)((ObMenu *)m)->plugin_data) static char *PLUGIN_NAME = "timed_menu"; typedef enum { TIMED_MENU_PIPE, /* read entries from a child process' output */ TIMED_MENU_STAT /* reread entries from file when timestamp changes */ } Timed_Menu_Type; typedef struct { Timed_Menu_Type type; ObTimer *timer; char *command; /* for the PIPE */ char *buf; /* buffer to hold partially read menu */ unsigned long buflen; /* how many bytes are in the buffer */ int fd; /* file descriptor to read menu from */ pid_t pid; /* pid of child process in PIPE */ time_t mtime; /* time of last modification */ } Timed_Menu_Data; void plugin_setup_config() { } void plugin_startup() { } void plugin_shutdown() { } void timed_menu_clean_up(ObMenu *m) { if (TIMED_MENU_DATA(m)->buf != NULL) { fprintf(stderr, "%s", TIMED_MENU_DATA(m)->buf); g_free(TIMED_MENU_DATA(m)->buf); TIMED_MENU_DATA(m)->buf = NULL; } TIMED_MENU_DATA(m)->buflen = 0; if (TIMED_MENU_DATA(m)->fd != -1) { event_remove_fd(TIMED_MENU_DATA(m)->fd); close(TIMED_MENU_DATA(m)->fd); TIMED_MENU_DATA(m)->fd = -1; } if (TIMED_MENU_DATA(m)->pid != -1) { waitpid(TIMED_MENU_DATA(m)->pid, NULL, 0); TIMED_MENU_DATA(m)->pid = -1; } TIMED_MENU_DATA(m)->mtime = 0; } void timed_menu_read_pipe(int fd, void *d) { ObMenu *menu = d; char *tmpbuf = NULL; unsigned long num_read; #ifdef DEBUG /* because gdb is dumb */ #if 0 Timed_Menu_Data *d = TIMED_MENU_DATA(menu); #endif #endif unsigned long num_realloc; /* if we have less than a quarter BUFSIZ left, allocate more */ num_realloc = (BUFSIZ - (TIMED_MENU_DATA(menu)->buflen % BUFSIZ) < BUFSIZ >> 2) ? 0 : BUFSIZ; tmpbuf = g_try_realloc(TIMED_MENU_DATA(menu)->buf, TIMED_MENU_DATA(menu)->buflen + num_realloc); if (tmpbuf == NULL) { g_warning("Unable to allocate memory for read()"); return; } TIMED_MENU_DATA(menu)->buf = tmpbuf; num_read = read(fd, TIMED_MENU_DATA(menu)->buf + TIMED_MENU_DATA(menu)->buflen, num_realloc); if (num_read == 0) { unsigned long count = 0; char *found = NULL; menu->invalid = TRUE; menu_clear(menu); /* TEMP: list them */ while (NULL != (found = strchr(&TIMED_MENU_DATA(menu)->buf[count], '\n'))) { TIMED_MENU_DATA(menu)->buf [found - TIMED_MENU_DATA(menu)->buf] = '\0'; menu_add_entry(menu, menu_entry_new_separator (&TIMED_MENU_DATA(menu)->buf[count])); count = found - TIMED_MENU_DATA(menu)->buf + 1; } TIMED_MENU_DATA(menu)->buf[TIMED_MENU_DATA(menu)->buflen] = '\0'; timed_menu_clean_up(menu); } else if (num_read > 0) { TIMED_MENU_DATA(menu)->buflen += num_read; TIMED_MENU_DATA(menu)->buf[TIMED_MENU_DATA(menu)->buflen] = '\0'; } else { /* num_read < 1 */ g_warning("Error on read %s", strerror(errno)); timed_menu_clean_up(menu); } } void timed_menu_timeout_handler(void *d) { ObMenu *data = d; if (!data->shown && TIMED_MENU_DATA(data)->fd == -1) { switch (TIMED_MENU_DATA(data)->type) { case (TIMED_MENU_PIPE): { /* if the menu is not shown, run a process and use its output as menu */ /* I hate you glib in all your hideous forms */ char *args[4]; int child_stdout; int child_pid; args[0] = "/bin/sh"; args[1] = "-c"; args[2] = TIMED_MENU_DATA(data)->command; args[3] = NULL; if (g_spawn_async_with_pipes( NULL, args, NULL, G_SPAWN_SEARCH_PATH | G_SPAWN_DO_NOT_REAP_CHILD, NULL, NULL, &child_pid, NULL, &child_stdout, NULL, NULL)) { event_fd_handler *h = g_new(event_fd_handler, 1); TIMED_MENU_DATA(data)->fd = h->fd = child_stdout; TIMED_MENU_DATA(data)->pid = child_pid; h->handler = timed_menu_read_pipe; h->data = data; event_add_fd_handler(h); } else { g_warning("unable to spawn child"); } break; } case (TIMED_MENU_STAT): { struct stat stat_buf; if (stat(TIMED_MENU_DATA(data)->command, &stat_buf) == -1) { g_warning("Unable to stat %s: %s", TIMED_MENU_DATA(data)->command, strerror(errno)); break; } if (stat_buf.st_mtime > TIMED_MENU_DATA(data)->mtime) { g_warning("file changed"); TIMED_MENU_DATA(data)->mtime = stat_buf.st_mtime; /* TODO: parse */ } } } } } void *plugin_create() { Timed_Menu_Data *d = g_new(Timed_Menu_Data, 1); ObMenu *m = menu_new("", PLUGIN_NAME, NULL); m->plugin = PLUGIN_NAME; d->type = TIMED_MENU_STAT; d->timer = timer_start(6000000, &timed_menu_timeout_handler, m); d->command = "/home/woodblock/timed_menu_stat"; d->buf = NULL; d->buflen = 0; d->fd = -1; d->pid = -1; d->mtime = 0; m->plugin_data = (void *)d; timed_menu_timeout_handler(m); return (void *)m; } void plugin_destroy (void *m) { timed_menu_clean_up(m); /* this will be freed by timer_* */ timer_stop( ((Timed_Menu_Data *)TIMED_MENU(m)->plugin_data)->timer); g_free( TIMED_MENU(m)->plugin_data ); } |