gui: Check return value of para_exec_cmdline_pid().
[paraslash.git] / audioc.c
index fa1768b..d3e092e 100644 (file)
--- a/audioc.c
+++ b/audioc.c
@@ -1,14 +1,15 @@
 /*
- * Copyright (C) 2005-2009 Andre Noll <maan@systemlinux.org>
+ * Copyright (C) 2005-2012 Andre Noll <maan@systemlinux.org>
  *
  * Licensed under the GPL v2. For licencing details see COPYING.
  */
 
-/** \file audioc.c the client program used to connect to para_audiod */
+/** \file audioc.c The client program used to connect to para_audiod. */
 
 #include <regex.h>
 #include <sys/types.h>
-#include <dirent.h>
+#include <stdbool.h>
+#include <signal.h>
 
 #include "audioc.cmdline.h"
 #include "para.h"
 #include "net.h"
 #include "string.h"
 #include "fd.h"
+#include "version.h"
 
 INIT_AUDIOC_ERRLISTS;
 
 /** The gengetopt structure containing command line args. */
 static struct audioc_args_info conf;
+static char *socket_name;
+
 
 static int loglevel;
 INIT_STDERR_LOGGING(loglevel);
 
 static char *concat_args(unsigned argc, char * const *argv)
 {
-       int i; char *buf = NULL;
+       int i;
+       char *buf = NULL;
+
        for (i = 0; i < argc; i++) {
                buf = para_strcat(buf, argv[i]);
                if (i != argc - 1)
@@ -36,42 +42,250 @@ static char *concat_args(unsigned argc, char * const *argv)
        return buf;
 }
 
-static char *configfile_exists(void)
+#ifdef HAVE_READLINE
+#include "list.h"
+#include "sched.h"
+#include "buffer_tree.h"
+#include "interactive.h"
+#include "audiod_completion.h"
+
+static struct sched sched;
+
+struct audioc_task {
+       int fd;
+       struct btr_node *btrn;
+       struct task task;
+};
+
+static struct i9e_completer audiod_completers[];
+
+I9E_DUMMY_COMPLETER(cycle);
+I9E_DUMMY_COMPLETER(off);
+I9E_DUMMY_COMPLETER(on);
+I9E_DUMMY_COMPLETER(sb);
+I9E_DUMMY_COMPLETER(tasks);
+I9E_DUMMY_COMPLETER(term);
+
+static void help_completer(struct i9e_completion_info *ci,
+               struct i9e_completion_result *result)
 {
-       static char *config_file;
-       struct stat statbuf;
+       result->matches = i9e_complete_commands(ci->word, audiod_completers);
+}
+
+static void stat_completer(struct i9e_completion_info *ci,
+               struct i9e_completion_result *cr)
+{
+       char *sia[] = {STATUS_ITEM_ARRAY NULL};
+       char *opts[] = {"-p", NULL};
+
+       if (ci->word_num <= 2 && ci->word && ci->word[0] == '-')
+               i9e_complete_option(opts, ci, cr);
+       else
+               i9e_extract_completions(ci->word, sia, &cr->matches);
+}
+
+static void grab_completer(struct i9e_completion_info *ci,
+               struct i9e_completion_result *cr)
+{
+       char *opts[] = {"-ms", "-ms", "-ma", "-p=", "-n=", "-o", NULL};
+       i9e_complete_option(opts, ci, cr);
+}
+
+static struct i9e_completer audiod_completers[] = {
+       AUDIOD_COMPLETERS
+       {.name = NULL}
+};
+
+static void audioc_pre_select(struct sched *s, struct task *t)
+{
+       struct audioc_task *at = container_of(t, struct audioc_task, task);
+       int ret = btr_node_status(at->btrn, 0, BTR_NT_ROOT);
+
+       if (ret < 0)
+               sched_min_delay(s);
+       para_fd_set(at->fd, &s->rfds, &s->max_fileno);
+}
+
+static void audioc_post_select(struct sched *s, struct task *t)
+{
+       char *buf = NULL;
+       struct audioc_task *at = container_of(t, struct audioc_task, task);
+       int ret = btr_node_status(at->btrn, 0, BTR_NT_ROOT);
+
+       if (ret < 0)
+               goto out;
+       if (!FD_ISSET(at->fd, &s->rfds))
+               return;
+       buf = para_malloc(conf.bufsize_arg);
+       ret = recv_bin_buffer(at->fd, buf, conf.bufsize_arg);
+       PARA_DEBUG_LOG("recv: %d\n", ret);
+       if (ret == 0)
+               ret = -E_AUDIOC_EOF;
+       if (ret < 0)
+               goto out;
+       btr_add_output(buf, ret, at->btrn);
+       return;
+out:
+       if (ret < 0) {
+               free(buf);
+               btr_remove_node(at->btrn);
+               btr_free_node(at->btrn);
+               at->btrn = NULL;
+               close(at->fd);
+       }
+       t->error = ret;
+}
 
+static struct audioc_task audioc_task = {
+       .task = {
+               .pre_select = audioc_pre_select,
+               .post_select = audioc_post_select,
+               .status = "audioc task"
+       },
+}, *at = &audioc_task;
 
-       if (!config_file) {
+static int audioc_i9e_line_handler(char *line)
+{
+       char *args = NULL;
+       int ret;
+       if (!line || !*line)
+               return 0;
+
+       PARA_DEBUG_LOG("line: %s\n", line);
+       ret = create_argv(line, " ", &conf.inputs);
+       if (ret < 0)
+               return ret;
+       conf.inputs_num = ret;
+       args = concat_args(conf.inputs_num, conf.inputs);
+       free_argv(conf.inputs);
+       conf.inputs_num = 0; /* required for audioc_cmdline_parser_free() */
+       ret = connect_local_socket(socket_name);
+       if (ret < 0)
+               goto out;
+       at->fd = ret;
+       ret = mark_fd_nonblocking(at->fd);
+       if (ret < 0)
+               goto close;
+       ret = send_cred_buffer(at->fd, args);
+       if (ret < 0)
+               goto close;
+       free(args);
+       args = NULL;
+       at->btrn = btr_new_node(&(struct btr_node_description)
+               EMBRACE(.name = "audioc line handler"));
+       at->task.error = 0;
+       register_task(&sched, &at->task);
+       i9e_attach_to_stdout(at->btrn);
+       return 1;
+close:
+       close(at->fd);
+out:
+       free(args);
+       return ret;
+}
+
+__noreturn static void interactive_session(void)
+{
+       int ret;
+       char *history_file;
+       struct sigaction act;
+       struct i9e_client_info ici = {
+               .fds = {0, 1, 2},
+               .prompt = "para_audioc> ",
+               .line_handler = audioc_i9e_line_handler,
+               .loglevel = loglevel,
+               .completers = audiod_completers,
+       };
+       PARA_NOTICE_LOG("\n%s\n", VERSION_TEXT("audioc"));
+       if (conf.history_file_given)
+               history_file = para_strdup(conf.history_file_arg);
+       else {
                char *home = para_homedir();
-               config_file = make_message("%s/.paraslash/audioc.conf", home);
+               history_file = make_message("%s/.paraslash/audioc.history",
+                       home);
                free(home);
        }
+       ici.history_file = history_file;
+
+       act.sa_handler = i9e_signal_dispatch;
+       sigemptyset(&act.sa_mask);
+       act.sa_flags = 0;
+       sigaction(SIGINT, &act, NULL);
+       sched.select_function = i9e_select;
+
+       sched.default_timeout.tv_sec = 1;
+       ret = i9e_open(&ici, &sched);
+       if (ret < 0)
+               goto out;
+       para_log = i9e_log;
+       ret = schedule(&sched);
+       i9e_close();
+       para_log = stderr_log;
+out:
+       free(history_file);
+       audioc_cmdline_parser_free(&conf);
+       if (ret < 0)
+               PARA_ERROR_LOG("%s\n", para_strerror(-ret));
+       exit(ret < 0? EXIT_FAILURE : EXIT_SUCCESS);
+}
+
+__noreturn static void print_completions(void)
+{
+       int ret = i9e_print_completions(audiod_completers);
+       exit(ret <= 0? EXIT_FAILURE : EXIT_SUCCESS);
+}
+
+#else /* HAVE_READLINE */
+
+__noreturn static void interactive_session(void)
+{
+       PARA_EMERG_LOG("interactive sessions not available\n");
+       exit(EXIT_FAILURE);
+}
+
+__noreturn static void print_completions(void)
+{
+       PARA_EMERG_LOG("command completion not available\n");
+       exit(EXIT_FAILURE);
+}
+
+#endif /* HAVE_READLINE */
+
+static char *configfile_exists(void)
+{
+       char *config_file;
+       struct stat statbuf;
+       char *home = para_homedir();
+
+       config_file = make_message("%s/.paraslash/audioc.conf", home);
+       free(home);
        if (!stat(config_file, &statbuf))
                return config_file;
+       free(config_file);
        return NULL;
 }
 
 /**
- * the client program to connect to para_audiod
+ * The client program to connect to para_audiod.
  *
- * \param argc usual argument count
- * \param argv usual argument vector
+ * \param argc Usual argument count.
+ * \param argv Usual argument vector.
  *
- * It creates a temporary local socket in order to communicate with para_audiod.
- * Authentication consists in sending a ucred buffer that contains the user id.
+ * It connects to the "well-known" local socket to communicate with
+ * para_audiod. Authentication is performed by sending a ucred buffer
+ * containing the user id to the local socket.
  *
- * Any output received through the local socket is sent to stdout.
+ * Any data received from the socket is written to stdout.
  *
- * \return EXIT_SUCCESS or EXIT_FAILURE
+ * \return EXIT_SUCCESS or EXIT_FAILURE.
  *
  * \sa send_cred_buffer(), para_audioc(1), para_audiod(1).
  */
 int main(int argc, char *argv[])
 {
        int ret = -E_AUDIOC_SYNTAX, fd;
-       char *cf, *buf = NULL, *args;
-       size_t bufsize, loaded = 0;
+       char *cf, *buf = NULL, *args = NULL;
+       size_t bufsize;
 
        if (audioc_cmdline_parser(argc, argv, &conf))
                goto out;
@@ -84,81 +298,54 @@ int main(int argc, char *argv[])
                        .check_required = 0,
                        .check_ambiguity = 0
                };
-               if (audioc_cmdline_parser_config_file(cf, &conf, &params)) {
+               ret = audioc_cmdline_parser_config_file(cf, &conf, &params);
+               free(cf);
+               if (ret) {
                        fprintf(stderr, "parse error in config file\n");
                        exit(EXIT_FAILURE);
                }
        }
        loglevel = get_loglevel_by_name(conf.loglevel_arg);
-       args = conf.inputs_num?
-               concat_args(conf.inputs_num, conf.inputs) :
-               para_strdup("stat");
-       bufsize = conf.bufsize_arg;
-       buf = para_malloc(bufsize);
-
-       if (conf.socket_given) {
-               ret = create_remote_socket(conf.socket_arg);
-       } else {
-               char *hn = para_hostname(),
-                    *socket_name = make_message("/var/paraslash/audiod_socket.%s", hn);
-
-               ret = create_remote_socket(socket_name);
+       if (conf.socket_given)
+               socket_name = para_strdup(conf.socket_arg);
+       else {
+               char *hn = para_hostname();
+               socket_name = make_message("/var/paraslash/audiod_socket.%s",
+                       hn);
                free(hn);
-               free(socket_name);
        }
-       if (ret < 0)
+
+       if (conf.complete_given)
+               print_completions();
+
+       if (conf.inputs_num == 0)
+               interactive_session();
+       args = concat_args(conf.inputs_num, conf.inputs);
+
+       ret = connect_local_socket(socket_name);
+       free(socket_name);
+       if (ret < 0) {
+               PARA_EMERG_LOG("failed to connect to local socket\n");
                goto out;
+       }
        fd = ret;
-       ret = mark_fd_nonblocking(fd);
-       if (ret < 0)
-               goto out;
-       ret = mark_fd_nonblocking(STDOUT_FILENO);
+       ret = send_cred_buffer(fd, args);
        if (ret < 0)
                goto out;
-       ret = send_cred_buffer(fd, args);
+       bufsize = conf.bufsize_arg;
+       buf = para_malloc(bufsize);
+       ret = mark_fd_blocking(STDOUT_FILENO);
        if (ret < 0)
                goto out;
-       for (;;) {
-               int max_fileno = -1, check_write = 0;
-               ssize_t len;
-               fd_set rfd, wfd;
-               FD_ZERO(&rfd);
-               FD_ZERO(&wfd);
-               if (loaded < bufsize)
-                       para_fd_set(fd, &rfd, &max_fileno);
-               if (loaded > 0) {
-                       para_fd_set(STDOUT_FILENO, &wfd, &max_fileno);
-                       check_write = 1;
-               }
-               ret = -E_AUDIOC_OVERRUN;
-               if (max_fileno < 0)
-                       goto out;
-               ret = para_select(max_fileno + 1, &rfd, &wfd, NULL);
-               if (ret < 0)
-                       goto out;
-               if (loaded < bufsize && FD_ISSET(fd, &rfd)) {
-                       len = recv_bin_buffer(fd, buf + loaded,
-                               bufsize - loaded);
-                       if (len <= 0) {
-                               ret = len < 0? -E_AUDIOC_READ : 0;
-                               goto out;
-                       }
-                       loaded += len;
-               }
-               if (check_write && FD_ISSET(STDOUT_FILENO, &wfd)) {
-                       ret = write(STDOUT_FILENO, buf, loaded);
-                       if (ret < 0) {
-                               ret = -E_AUDIOC_WRITE;
-                               goto out;
-                       }
-                       loaded -= ret;
-                       if (loaded && ret)
-                               memmove(buf, buf + ret, loaded);
-               }
-       }
+       do {
+               size_t n = ret = recv_bin_buffer(fd, buf, bufsize);
+               if (ret <= 0)
+                       break;
+               ret = write_all(STDOUT_FILENO, buf, n);
+       } while (ret >= 0);
 out:
-       if (!ret && loaded && buf)
-               ret = write(STDOUT_FILENO, buf, loaded);
+       free(buf);
+       free(args);
        if (ret < 0)
                PARA_ERROR_LOG("%s\n", para_strerror(-ret));
        return ret < 0? EXIT_FAILURE : EXIT_SUCCESS;