src/modules/module-cli.c

   1 /***
   2   This file is part of PulseAudio.
   3
   4   Copyright 2004-2006 Lennart Poettering
   5
   6   PulseAudio is free software; you can redistribute it and/or modify
   7   it under the terms of the GNU Lesser General Public License as published
   8   by the Free Software Foundation; either version 2.1 of the License,
   9   or (at your option) any later version.
  10
  11   PulseAudio is distributed in the hope that it will be useful, but
  12   WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14   General Public License for more details.
  15
  16   You should have received a copy of the GNU Lesser General Public License
  17   along with PulseAudio; if not, write to the Free Software
  18   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  19   USA.
  20 ***/
  21
  22 #ifdef HAVE_CONFIG_H
  23 #include <config.h>
  24 #endif
  25
  26 #include <stdio.h>
  27 #include <unistd.h>
  28 #include <fcntl.h>
  29 #include <errno.h>
  30
  31 #include <pulsecore/module.h>
  32 #include <pulsecore/iochannel.h>
  33 #include <pulsecore/cli.h>
  34 #include <pulsecore/sioman.h>
  35 #include <pulsecore/log.h>
  36 #include <pulsecore/modargs.h>
  37 #include <pulsecore/macro.h>
  38 #include <pulsecore/core-util.h>
  39 #include <pulsecore/core-error.h>
  40
  41 #include "module-cli-symdef.h"
  42
  43 PA_MODULE_AUTHOR("Lennart Poettering");
  44 PA_MODULE_DESCRIPTION("Command line interface");
  45 PA_MODULE_VERSION(PACKAGE_VERSION);
  46 PA_MODULE_LOAD_ONCE(TRUE);
  47 PA_MODULE_USAGE("exit_on_eof=<exit daemon after EOF?>");
  48
  49 static const char* const valid_modargs[] = {
  50     "exit_on_eof",
  51     NULL
  52 };
  53
  54 static void eof_and_unload_cb(pa_cli*c, void *userdata) {
  55     pa_module *m = userdata;
  56
  57     pa_assert(c);
  58     pa_assert(m);
  59
  60     pa_module_unload_request(m, TRUE);
  61 }
  62
  63 static void eof_and_exit_cb(pa_cli*c, void *userdata) {
  64     pa_module *m = userdata;
  65
  66     pa_assert(c);
  67     pa_assert(m);
  68
  69     pa_core_exit(m->core, FALSE, 0);
  70 }
  71
  72 int pa__init(pa_module*m) {
  73     pa_iochannel *io;
  74     pa_modargs *ma;
  75     pa_bool_t exit_on_eof = FALSE;
  76     int fd;
  77
  78     pa_assert(m);
  79
  80     if (m->core->running_as_daemon) {
  81         pa_log_info("Running as daemon, refusing to load this module.");
  82         return 0;
  83     }
  84
  85     if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
  86         pa_log("failed to parse module arguments.");
  87         goto fail;
  88     }
  89
  90     if (pa_modargs_get_value_boolean(ma, "exit_on_eof", &exit_on_eof) < 0) {
  91         pa_log("exit_on_eof= expects boolean argument.");
  92         goto fail;
  93     }
  94
  95     if (pa_stdio_acquire() < 0) {
  96         pa_log("STDIN/STDOUT already in use.");
  97         goto fail;
  98     }
  99
 100     /* We try to open the controlling tty anew here. This has the
 101      * benefit of giving us a new fd that doesn't share the O_NDELAY
 102      * flag with fds 0, 1, or 2. Since pa_iochannel_xxx needs O_NDELAY
 103      * on its fd using those fds directly could set O_NDELAY which
 104      * fprintf() doesn't really like, resulting in truncated output
 105      * of log messages, particularly because if stdout and stderr are
 106      * dup'ed they share the same O_NDELAY, too. */
 107
 108     if ((fd = pa_open_cloexec("/dev/tty", O_RDWR|O_NONBLOCK, 0)) >= 0) {
 109         io = pa_iochannel_new(m->core->mainloop, fd, fd);
 110         pa_log_debug("Managed to open /dev/tty.");
 111     } else {
 112         io = pa_iochannel_new(m->core->mainloop, STDIN_FILENO, STDOUT_FILENO);
 113         pa_iochannel_set_noclose(io, TRUE);
 114         pa_log_debug("Failed to open /dev/tty, using stdin/stdout fds instead.");
 115     }
 116
 117     m->userdata = pa_cli_new(m->core, io, m);
 118     pa_cli_set_eof_callback(m->userdata, exit_on_eof ? eof_and_exit_cb : eof_and_unload_cb, m);
 119
 120     pa_modargs_free(ma);
 121
 122     return 0;
 123
 124 fail:
 125
 126     if (ma)
 127         pa_modargs_free(ma);
 128
 129     return -1;
 130 }
 131
 132 void pa__done(pa_module*m) {
 133     pa_assert(m);
 134
 135     if (m->userdata) {
 136         pa_cli_free(m->userdata);
 137         pa_stdio_release();
 138     }
 139 }