diff options
Diffstat (limited to '')
| -rw-r--r-- | src/daemon/main.c | 1247 |
1 files changed, 1247 insertions, 0 deletions
diff --git a/src/daemon/main.c b/src/daemon/main.c new file mode 100644 index 0000000..30ef499 --- /dev/null +++ b/src/daemon/main.c @@ -0,0 +1,1247 @@ +/*** + This file is part of PulseAudio. + + Copyright 2004-2006 Lennart Poettering + Copyright 2006 Pierre Ossman <ossman@cendio.se> for Cendio AB + + PulseAudio is free software; you can redistribute it and/or modify + it under the terms of the GNU Lesser General Public License as published + by the Free Software Foundation; either version 2.1 of the License, + or (at your option) any later version. + + PulseAudio is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + General Public License for more details. + + You should have received a copy of the GNU Lesser General Public License + along with PulseAudio; if not, see <http://www.gnu.org/licenses/>. +***/ + +#ifdef HAVE_CONFIG_H +#include <config.h> +#endif + +#include <unistd.h> +#include <errno.h> +#include <string.h> +#include <stdlib.h> +#include <stdio.h> +#include <signal.h> +#include <stddef.h> +#include <ltdl.h> +#include <limits.h> +#include <unistd.h> +#include <locale.h> +#include <sys/types.h> +#include <sys/stat.h> + +#ifdef HAVE_SYS_MMAN_H +#include <sys/mman.h> +#endif + +#ifdef HAVE_PWD_H +#include <pwd.h> +#endif +#ifdef HAVE_GRP_H +#include <grp.h> +#endif + +#ifdef HAVE_LIBWRAP +#include <syslog.h> +#include <tcpd.h> +#endif + +#ifdef HAVE_DBUS +#include <dbus/dbus.h> +#endif + +#ifdef HAVE_SYSTEMD_DAEMON +#include <systemd/sd-daemon.h> +#endif + +#include <pulse/client-conf.h> +#include <pulse/mainloop.h> +#include <pulse/mainloop-signal.h> +#include <pulse/timeval.h> +#include <pulse/xmalloc.h> + +#include <pulsecore/i18n.h> +#include <pulsecore/lock-autospawn.h> +#include <pulsecore/socket.h> +#include <pulsecore/core-error.h> +#include <pulsecore/core-rtclock.h> +#include <pulsecore/core-scache.h> +#include <pulsecore/core.h> +#include <pulsecore/module.h> +#include <pulsecore/cli-command.h> +#include <pulsecore/log.h> +#include <pulsecore/core-util.h> +#include <pulsecore/sioman.h> +#include <pulsecore/cli-text.h> +#include <pulsecore/pid.h> +#include <pulsecore/random.h> +#include <pulsecore/macro.h> +#include <pulsecore/shm.h> +#include <pulsecore/memtrap.h> +#include <pulsecore/strlist.h> +#ifdef HAVE_DBUS +#include <pulsecore/dbus-shared.h> +#endif +#include <pulsecore/cpu.h> + +#include "cmdline.h" +#include "cpulimit.h" +#include "daemon-conf.h" +#include "dumpmodules.h" +#include "caps.h" +#include "ltdl-bind-now.h" +#include "server-lookup.h" + +#ifdef DISABLE_LIBTOOL_PRELOAD +/* FIXME: work around a libtool bug by making sure we have 2 elements. Bug has + * been reported: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=29576 */ +const lt_dlsymlist lt_preloaded_symbols[] = { + { "@PROGRAM@", NULL }, + { NULL, NULL } +}; +#endif + +#ifdef HAVE_LIBWRAP +/* Only one instance of these variables */ +int allow_severity = LOG_INFO; +int deny_severity = LOG_WARNING; +#endif + +#ifdef HAVE_OSS_WRAPPER +/* padsp looks for this symbol in the running process and disables + * itself if it finds it and it is set to 7 (which is actually a bit + * mask). For details see padsp. */ +int __padsp_disabled__ = 7; +#endif + +static void signal_callback(pa_mainloop_api* m, pa_signal_event *e, int sig, void *userdata) { + pa_module *module = NULL; + + pa_log_info("Got signal %s.", pa_sig2str(sig)); + + switch (sig) { +#ifdef SIGUSR1 + case SIGUSR1: + pa_module_load(&module, userdata, "module-cli", NULL); + break; +#endif + +#ifdef SIGUSR2 + case SIGUSR2: + pa_module_load(&module, userdata, "module-cli-protocol-unix", NULL); + break; +#endif + +#ifdef SIGHUP + case SIGHUP: { + char *c = pa_full_status_string(userdata); + pa_log_notice("%s", c); + pa_xfree(c); + return; + } +#endif + + case SIGINT: + case SIGTERM: + default: + pa_log_info("Exiting."); + m->quit(m, 0); + break; + } +} + +#if defined(HAVE_PWD_H) && defined(HAVE_GRP_H) + +static int change_user(void) { + struct passwd *pw; + struct group * gr; + int r; + + /* This function is called only in system-wide mode. It creates a + * runtime dir in /var/run/ with proper UID/GID and drops privs + * afterwards. */ + + if (!(pw = getpwnam(PA_SYSTEM_USER))) { + pa_log(_("Failed to find user '%s'."), PA_SYSTEM_USER); + return -1; + } + + if (!(gr = getgrnam(PA_SYSTEM_GROUP))) { + pa_log(_("Failed to find group '%s'."), PA_SYSTEM_GROUP); + return -1; + } + + pa_log_info("Found user '%s' (UID %lu) and group '%s' (GID %lu).", + PA_SYSTEM_USER, (unsigned long) pw->pw_uid, + PA_SYSTEM_GROUP, (unsigned long) gr->gr_gid); + + if (pw->pw_gid != gr->gr_gid) { + pa_log(_("GID of user '%s' and of group '%s' don't match."), PA_SYSTEM_USER, PA_SYSTEM_GROUP); + return -1; + } + + if (!pa_streq(pw->pw_dir, PA_SYSTEM_RUNTIME_PATH)) + pa_log_warn(_("Home directory of user '%s' is not '%s', ignoring."), PA_SYSTEM_USER, PA_SYSTEM_RUNTIME_PATH); + + if (pa_make_secure_dir(PA_SYSTEM_RUNTIME_PATH, 0755, pw->pw_uid, gr->gr_gid, true) < 0) { + pa_log(_("Failed to create '%s': %s"), PA_SYSTEM_RUNTIME_PATH, pa_cstrerror(errno)); + return -1; + } + + if (pa_make_secure_dir(PA_SYSTEM_STATE_PATH, 0700, pw->pw_uid, gr->gr_gid, true) < 0) { + pa_log(_("Failed to create '%s': %s"), PA_SYSTEM_STATE_PATH, pa_cstrerror(errno)); + return -1; + } + + /* We don't create the config dir here, because we don't need to write to it */ + + if (initgroups(PA_SYSTEM_USER, gr->gr_gid) != 0) { + pa_log(_("Failed to change group list: %s"), pa_cstrerror(errno)); + return -1; + } + +#if defined(HAVE_SETRESGID) + r = setresgid(gr->gr_gid, gr->gr_gid, gr->gr_gid); +#elif defined(HAVE_SETEGID) + if ((r = setgid(gr->gr_gid)) >= 0) + r = setegid(gr->gr_gid); +#elif defined(HAVE_SETREGID) + r = setregid(gr->gr_gid, gr->gr_gid); +#else +#error "No API to drop privileges" +#endif + + if (r < 0) { + pa_log(_("Failed to change GID: %s"), pa_cstrerror(errno)); + return -1; + } + +#if defined(HAVE_SETRESUID) + r = setresuid(pw->pw_uid, pw->pw_uid, pw->pw_uid); +#elif defined(HAVE_SETEUID) + if ((r = setuid(pw->pw_uid)) >= 0) + r = seteuid(pw->pw_uid); +#elif defined(HAVE_SETREUID) + r = setreuid(pw->pw_uid, pw->pw_uid); +#else +#error "No API to drop privileges" +#endif + + if (r < 0) { + pa_log(_("Failed to change UID: %s"), pa_cstrerror(errno)); + return -1; + } + + pa_drop_caps(); + + pa_set_env("USER", PA_SYSTEM_USER); + pa_set_env("USERNAME", PA_SYSTEM_USER); + pa_set_env("LOGNAME", PA_SYSTEM_USER); + pa_set_env("HOME", PA_SYSTEM_RUNTIME_PATH); + + /* Relevant for pa_runtime_path() */ + if (!getenv("PULSE_RUNTIME_PATH")) + pa_set_env("PULSE_RUNTIME_PATH", PA_SYSTEM_RUNTIME_PATH); + + if (!getenv("PULSE_CONFIG_PATH")) + pa_set_env("PULSE_CONFIG_PATH", PA_SYSTEM_CONFIG_PATH); + + if (!getenv("PULSE_STATE_PATH")) + pa_set_env("PULSE_STATE_PATH", PA_SYSTEM_STATE_PATH); + + pa_log_info("Successfully changed user to \"" PA_SYSTEM_USER "\"."); + + return 0; +} + +#else /* HAVE_PWD_H && HAVE_GRP_H */ + +static int change_user(void) { + pa_log(_("System wide mode unsupported on this platform.")); + return -1; +} + +#endif /* HAVE_PWD_H && HAVE_GRP_H */ + +#ifdef HAVE_SYS_RESOURCE_H + +static int set_one_rlimit(const pa_rlimit *r, int resource, const char *name) { + struct rlimit rl; + pa_assert(r); + + if (!r->is_set) + return 0; + + rl.rlim_cur = rl.rlim_max = r->value; + + if (setrlimit(resource, &rl) < 0) { + pa_log_info("setrlimit(%s, (%u, %u)) failed: %s", name, (unsigned) r->value, (unsigned) r->value, pa_cstrerror(errno)); + return -1; + } + + return 0; +} + +static void set_all_rlimits(const pa_daemon_conf *conf) { + set_one_rlimit(&conf->rlimit_fsize, RLIMIT_FSIZE, "RLIMIT_FSIZE"); + set_one_rlimit(&conf->rlimit_data, RLIMIT_DATA, "RLIMIT_DATA"); + set_one_rlimit(&conf->rlimit_stack, RLIMIT_STACK, "RLIMIT_STACK"); + set_one_rlimit(&conf->rlimit_core, RLIMIT_CORE, "RLIMIT_CORE"); +#ifdef RLIMIT_RSS + set_one_rlimit(&conf->rlimit_rss, RLIMIT_RSS, "RLIMIT_RSS"); +#endif +#ifdef RLIMIT_NPROC + set_one_rlimit(&conf->rlimit_nproc, RLIMIT_NPROC, "RLIMIT_NPROC"); +#endif +#ifdef RLIMIT_NOFILE + set_one_rlimit(&conf->rlimit_nofile, RLIMIT_NOFILE, "RLIMIT_NOFILE"); +#endif +#ifdef RLIMIT_MEMLOCK + set_one_rlimit(&conf->rlimit_memlock, RLIMIT_MEMLOCK, "RLIMIT_MEMLOCK"); +#endif +#ifdef RLIMIT_AS + set_one_rlimit(&conf->rlimit_as, RLIMIT_AS, "RLIMIT_AS"); +#endif +#ifdef RLIMIT_LOCKS + set_one_rlimit(&conf->rlimit_locks, RLIMIT_LOCKS, "RLIMIT_LOCKS"); +#endif +#ifdef RLIMIT_SIGPENDING + set_one_rlimit(&conf->rlimit_sigpending, RLIMIT_SIGPENDING, "RLIMIT_SIGPENDING"); +#endif +#ifdef RLIMIT_MSGQUEUE + set_one_rlimit(&conf->rlimit_msgqueue, RLIMIT_MSGQUEUE, "RLIMIT_MSGQUEUE"); +#endif +#ifdef RLIMIT_NICE + set_one_rlimit(&conf->rlimit_nice, RLIMIT_NICE, "RLIMIT_NICE"); +#endif +#ifdef RLIMIT_RTPRIO + set_one_rlimit(&conf->rlimit_rtprio, RLIMIT_RTPRIO, "RLIMIT_RTPRIO"); +#endif +#ifdef RLIMIT_RTTIME + set_one_rlimit(&conf->rlimit_rttime, RLIMIT_RTTIME, "RLIMIT_RTTIME"); +#endif +} +#endif + +static char *check_configured_address(void) { + char *default_server = NULL; + pa_client_conf *c = pa_client_conf_new(); + + pa_client_conf_load(c, true, true); + + if (c->default_server && *c->default_server) + default_server = pa_xstrdup(c->default_server); + + pa_client_conf_free(c); + + return default_server; +} + +#ifdef HAVE_DBUS +static pa_dbus_connection *register_dbus_name(pa_core *c, DBusBusType bus, const char* name) { + DBusError error; + pa_dbus_connection *conn; + + dbus_error_init(&error); + + if (!(conn = pa_dbus_bus_get(c, bus, &error)) || dbus_error_is_set(&error)) { + pa_log_warn("Unable to contact D-Bus: %s: %s", error.name, error.message); + goto fail; + } + + if (dbus_bus_request_name(pa_dbus_connection_get(conn), name, DBUS_NAME_FLAG_DO_NOT_QUEUE, &error) == DBUS_REQUEST_NAME_REPLY_PRIMARY_OWNER) { + pa_log_debug("Got %s!", name); + return conn; + } + + if (dbus_error_is_set(&error)) + pa_log_error("Failed to acquire %s: %s: %s", name, error.name, error.message); + else + pa_log_error("D-Bus name %s already taken.", name); + + /* PA cannot be started twice by the same user and hence we can + * ignore mostly the case that a name is already taken. */ + +fail: + if (conn) + pa_dbus_connection_unref(conn); + + dbus_error_free(&error); + return NULL; +} +#endif + +int main(int argc, char *argv[]) { + pa_core *c = NULL; + pa_strbuf *buf = NULL; + pa_daemon_conf *conf = NULL; + pa_mainloop *mainloop = NULL; + char *s; + char *configured_address; + int r = 0, retval = 1, d = 0; + bool valid_pid_file = false; + bool ltdl_init = false; + int n_fds = 0, *passed_fds = NULL; + const char *e; +#ifdef HAVE_FORK + int daemon_pipe[2] = { -1, -1 }; + int daemon_pipe2[2] = { -1, -1 }; +#endif + int autospawn_fd = -1; + bool autospawn_locked = false; +#ifdef HAVE_DBUS + pa_dbusobj_server_lookup *server_lookup = NULL; /* /org/pulseaudio/server_lookup */ + pa_dbus_connection *lookup_service_bus = NULL; /* Always the user bus. */ + pa_dbus_connection *server_bus = NULL; /* The bus where we reserve org.pulseaudio.Server, either the user or the system bus. */ + bool start_server; +#endif + + pa_log_set_ident("pulseaudio"); + pa_log_set_level(PA_LOG_NOTICE); + pa_log_set_flags(PA_LOG_COLORS|PA_LOG_PRINT_FILE|PA_LOG_PRINT_LEVEL, PA_LOG_RESET); + +#if !defined(HAVE_BIND_NOW) && defined(__linux__) && defined(__OPTIMIZE__) + /* + Disable lazy relocations to make usage of external libraries + more deterministic for our RT threads. We abuse __OPTIMIZE__ as + a check whether we are a debug build or not. This all is + admittedly a bit snake-oilish. + */ + + if (!getenv("LD_BIND_NOW")) { + char *rp; + char *canonical_rp; + + /* We have to execute ourselves, because the libc caches the + * value of $LD_BIND_NOW on initialization. */ + + pa_set_env("LD_BIND_NOW", "1"); + + if ((canonical_rp = pa_realpath(PA_BINARY))) { + + if ((rp = pa_readlink("/proc/self/exe"))) { + + if (pa_streq(rp, canonical_rp)) + pa_assert_se(execv(rp, argv) == 0); + else + pa_log_warn("/proc/self/exe does not point to %s, cannot self execute. Are you playing games?", canonical_rp); + + pa_xfree(rp); + + } else + pa_log_warn("Couldn't read /proc/self/exe, cannot self execute. Running in a chroot()?"); + + pa_xfree(canonical_rp); + + } else + pa_log_warn("Couldn't canonicalize binary path, cannot self execute."); + } +#endif + +#ifdef HAVE_SYSTEMD_DAEMON + n_fds = sd_listen_fds(0); + if (n_fds > 0) { + int i = n_fds; + + passed_fds = pa_xnew(int, n_fds+2); + passed_fds[n_fds] = passed_fds[n_fds+1] = -1; + while (i--) + passed_fds[i] = SD_LISTEN_FDS_START + i; + } +#endif + + if (!passed_fds) { + n_fds = 0; + passed_fds = pa_xnew(int, 2); + passed_fds[0] = passed_fds[1] = -1; + } + + if ((e = getenv("PULSE_PASSED_FD"))) { + int passed_fd = atoi(e); + if (passed_fd > 2) + passed_fds[n_fds] = passed_fd; + } + + /* We might be autospawned, in which case have no idea in which + * context we have been started. Let's cleanup our execution + * context as good as possible */ + + pa_reset_personality(); + pa_drop_root(); + pa_close_allv(passed_fds); + pa_xfree(passed_fds); + pa_reset_sigs(-1); + pa_unblock_sigs(-1); + pa_reset_priority(); + + setlocale(LC_ALL, ""); + pa_init_i18n(); + + conf = pa_daemon_conf_new(); + + if (pa_daemon_conf_load(conf, NULL) < 0) + goto finish; + + if (pa_daemon_conf_env(conf) < 0) + goto finish; + + if (pa_cmdline_parse(conf, argc, argv, &d) < 0) { + pa_log(_("Failed to parse command line.")); + goto finish; + } + + if (conf->log_target) + pa_log_set_target(conf->log_target); + else { + pa_log_target target = { .type = PA_LOG_STDERR, .file = NULL }; + pa_log_set_target(&target); + } + + pa_log_set_level(conf->log_level); + if (conf->log_meta) + pa_log_set_flags(PA_LOG_PRINT_META, PA_LOG_SET); + if (conf->log_time) + pa_log_set_flags(PA_LOG_PRINT_TIME, PA_LOG_SET); + pa_log_set_show_backtrace(conf->log_backtrace); + +#ifdef HAVE_DBUS + /* conf->system_instance and conf->local_server_type control almost the + * same thing; make them agree about what is requested. */ + switch (conf->local_server_type) { + case PA_SERVER_TYPE_UNSET: + conf->local_server_type = conf->system_instance ? PA_SERVER_TYPE_SYSTEM : PA_SERVER_TYPE_USER; + break; + case PA_SERVER_TYPE_USER: + case PA_SERVER_TYPE_NONE: + conf->system_instance = false; + break; + case PA_SERVER_TYPE_SYSTEM: + conf->system_instance = true; + break; + default: + pa_assert_not_reached(); + } + + start_server = conf->local_server_type == PA_SERVER_TYPE_USER || (getuid() == 0 && conf->local_server_type == PA_SERVER_TYPE_SYSTEM); + + if (!start_server && conf->local_server_type == PA_SERVER_TYPE_SYSTEM) { + pa_log_notice(_("System mode refused for non-root user. Only starting the D-Bus server lookup service.")); + conf->system_instance = false; + } +#endif + + LTDL_SET_PRELOADED_SYMBOLS(); + pa_ltdl_init(); + ltdl_init = true; + + if (conf->dl_search_path) + lt_dlsetsearchpath(conf->dl_search_path); + +#ifdef OS_IS_WIN32 + { + WSADATA data; + WSAStartup(MAKEWORD(2, 0), &data); + } +#endif + + pa_random_seed(); + + switch (conf->cmd) { + case PA_CMD_DUMP_MODULES: + pa_dump_modules(conf, argc-d, argv+d); + retval = 0; + goto finish; + + case PA_CMD_DUMP_CONF: { + + if (d < argc) { + pa_log("Too many arguments."); + goto finish; + } + + s = pa_daemon_conf_dump(conf); + fputs(s, stdout); + pa_xfree(s); + retval = 0; + goto finish; + } + + case PA_CMD_DUMP_RESAMPLE_METHODS: { + int i; + + if (d < argc) { + pa_log("Too many arguments."); + goto finish; + } + + for (i = 0; i < PA_RESAMPLER_MAX; i++) + if (pa_resample_method_supported(i)) + printf("%s\n", pa_resample_method_to_string(i)); + + retval = 0; + goto finish; + } + + case PA_CMD_HELP : + pa_cmdline_help(argv[0]); + retval = 0; + goto finish; + + case PA_CMD_VERSION : + + if (d < argc) { + pa_log("Too many arguments."); + goto finish; + } + + printf(PACKAGE_NAME" "PACKAGE_VERSION"\n"); + retval = 0; + goto finish; + + case PA_CMD_CHECK: { + pid_t pid; + + if (d < argc) { + pa_log("Too many arguments."); + goto finish; + } + + if (pa_pid_file_check_running(&pid, "pulseaudio") < 0) + pa_log_info("Daemon not running"); + else { + pa_log_info("Daemon running as PID %u", pid); + retval = 0; + } + + goto finish; + + } + case PA_CMD_KILL: + + if (d < argc) { + pa_log("Too many arguments."); + goto finish; + } + + if (pa_pid_file_kill(SIGINT, NULL, "pulseaudio") < 0) + pa_log(_("Failed to kill daemon: %s"), pa_cstrerror(errno)); + else + retval = 0; + + goto finish; + + case PA_CMD_CLEANUP_SHM: + + if (d < argc) { + pa_log("Too many arguments."); + goto finish; + } + + if (pa_shm_cleanup() >= 0) + retval = 0; + + goto finish; + + default: + pa_assert(conf->cmd == PA_CMD_DAEMON || conf->cmd == PA_CMD_START); + } + + if (d < argc) { + pa_log("Too many arguments."); + goto finish; + } + +#ifdef HAVE_GETUID + if (getuid() == 0 && !conf->system_instance) + pa_log_warn(_("This program is not intended to be run as root (unless --system is specified).")); +#ifndef HAVE_DBUS /* A similar, only a notice worthy check was done earlier, if D-Bus is enabled. */ + else if (getuid() != 0 && conf->system_instance) { + pa_log(_("Root privileges required.")); + goto finish; + } +#endif +#endif /* HAVE_GETUID */ + + if (conf->cmd == PA_CMD_START && conf->system_instance) { + pa_log(_("--start not supported for system instances.")); + goto finish; + } + + if (conf->cmd == PA_CMD_START && (configured_address = check_configured_address())) { + /* There is an server address in our config, but where did it come from? + * By default a standard X11 login will load module-x11-publish which will + * inject PULSE_SERVER X11 property. If the PA daemon crashes, we will end + * up hitting this code path. So we have to check to see if our configured_address + * is the same as the value that would go into this property so that we can + * recover (i.e. autospawn) from a crash. + */ + char *ufn; + bool start_anyway = false; + + if ((ufn = pa_runtime_path(PA_NATIVE_DEFAULT_UNIX_SOCKET))) { + char *id; + + if ((id = pa_machine_id())) { + pa_strlist *server_list; + char formatted_ufn[256]; + + pa_snprintf(formatted_ufn, sizeof(formatted_ufn), "{%s}unix:%s", id, ufn); + pa_xfree(id); + + if ((server_list = pa_strlist_parse(configured_address))) { + char *u = NULL; + + /* We only need to check the first server */ + server_list = pa_strlist_pop(server_list, &u); + pa_strlist_free(server_list); + + start_anyway = (u && pa_streq(formatted_ufn, u)); + pa_xfree(u); + } + } + pa_xfree(ufn); + } + + if (!start_anyway) { + pa_log_notice(_("User-configured server at %s, refusing to start/autospawn."), configured_address); + pa_xfree(configured_address); + retval = 0; + goto finish; + } + + pa_log_notice(_("User-configured server at %s, which appears to be local. Probing deeper."), configured_address); + pa_xfree(configured_address); + } + + if (conf->system_instance && !conf->disallow_exit) + pa_log_warn(_("Running in system mode, but --disallow-exit not set.")); + + if (conf->system_instance && !conf->disallow_module_loading) + pa_log_warn(_("Running in system mode, but --disallow-module-loading not set.")); + + if (conf->system_instance && !conf->disable_shm) { + pa_log_notice(_("Running in system mode, forcibly disabling SHM mode.")); + conf->disable_shm = true; + } + + if (conf->system_instance && conf->exit_idle_time >= 0) { + pa_log_notice(_("Running in system mode, forcibly disabling exit idle time.")); + conf->exit_idle_time = -1; + } + + if (conf->cmd == PA_CMD_START) { + /* If we shall start PA only when it is not running yet, we + * first take the autospawn lock to make things + * synchronous. */ + + /* This locking and thread synchronisation code doesn't work reliably + * on kFreeBSD (Debian bug #705435), or in upstream FreeBSD ports + * (bug reference: ports/128947, patched in SVN r231972). */ +#if !defined(__FreeBSD__) && !defined(__FreeBSD_kernel__) + if ((autospawn_fd = pa_autospawn_lock_init()) < 0) { + pa_log("Failed to initialize autospawn lock"); + goto finish; + } + + if ((pa_autospawn_lock_acquire(true) < 0)) { + pa_log("Failed to acquire autospawn lock"); + goto finish; + } + + autospawn_locked = true; +#endif + } + + if (conf->daemonize) { +#ifdef HAVE_FORK + pid_t child; +#endif + + if (pa_stdio_acquire() < 0) { + pa_log(_("Failed to acquire stdio.")); + goto finish; + } + +#ifdef HAVE_FORK + if (pipe(daemon_pipe) < 0) { + pa_log(_("pipe() failed: %s"), pa_cstrerror(errno)); + goto finish; + } + + if ((child = fork()) < 0) { + pa_log(_("fork() failed: %s"), pa_cstrerror(errno)); + pa_close_pipe(daemon_pipe); + goto finish; + } + + if (child != 0) { + ssize_t n; + /* Father */ + + pa_assert_se(pa_close(daemon_pipe[1]) == 0); + daemon_pipe[1] = -1; + + if ((n = pa_loop_read(daemon_pipe[0], &retval, sizeof(retval), NULL)) != sizeof(retval)) { + + if (n < 0) + pa_log(_("read() failed: %s"), pa_cstrerror(errno)); + + retval = 1; + } + + if (retval) + pa_log(_("Daemon startup failed.")); + else + pa_log_info("Daemon startup successful."); + + goto finish; + } + + if (autospawn_fd >= 0) { + /* The lock file is unlocked from the parent, so we need + * to close it in the child */ + + pa_autospawn_lock_release(); + pa_autospawn_lock_done(true); + + autospawn_locked = false; + autospawn_fd = -1; + } + + pa_assert_se(pa_close(daemon_pipe[0]) == 0); + daemon_pipe[0] = -1; +#endif + + if (!conf->log_target) { +#ifdef HAVE_SYSTEMD_JOURNAL + pa_log_target target = { .type = PA_LOG_JOURNAL, .file = NULL }; +#else + pa_log_target target = { .type = PA_LOG_SYSLOG, .file = NULL }; +#endif + pa_log_set_target(&target); + } + +#ifdef HAVE_SETSID + if (setsid() < 0) { + pa_log(_("setsid() failed: %s"), pa_cstrerror(errno)); + goto finish; + } +#endif + +#ifdef HAVE_FORK + /* We now are a session and process group leader. Let's fork + * again and let the father die, so that we'll become a + * process that can never acquire a TTY again, in a session and + * process group without leader */ + + if (pipe(daemon_pipe2) < 0) { + pa_log(_("pipe() failed: %s"), pa_cstrerror(errno)); + goto finish; + } + + if ((child = fork()) < 0) { + pa_log(_("fork() failed: %s"), pa_cstrerror(errno)); + pa_close_pipe(daemon_pipe2); + goto finish; + } + + if (child != 0) { + ssize_t n; + /* Father */ + + pa_assert_se(pa_close(daemon_pipe2[1]) == 0); + daemon_pipe2[1] = -1; + + if ((n = pa_loop_read(daemon_pipe2[0], &retval, sizeof(retval), NULL)) != sizeof(retval)) { + + if (n < 0) + pa_log(_("read() failed: %s"), pa_cstrerror(errno)); + + retval = 1; + } + + /* We now have to take care of signalling the first fork with + * the return value we've received from this fork... */ + pa_assert(daemon_pipe[1] >= 0); + + pa_loop_write(daemon_pipe[1], &retval, sizeof(retval), NULL); + pa_close(daemon_pipe[1]); + daemon_pipe[1] = -1; + + goto finish; + } + + pa_assert_se(pa_close(daemon_pipe2[0]) == 0); + daemon_pipe2[0] = -1; + + /* We no longer need the (first) daemon_pipe as it's handled in our child above */ + pa_close_pipe(daemon_pipe); +#endif + +#ifdef SIGTTOU + signal(SIGTTOU, SIG_IGN); +#endif +#ifdef SIGTTIN + signal(SIGTTIN, SIG_IGN); +#endif +#ifdef SIGTSTP + signal(SIGTSTP, SIG_IGN); +#endif + + pa_nullify_stdfds(); + } + + pa_set_env_and_record("PULSE_INTERNAL", "1"); + pa_assert_se(chdir("/") == 0); + umask(0077); + +#ifdef HAVE_SYS_RESOURCE_H + set_all_rlimits(conf); +#endif + pa_rtclock_hrtimer_enable(); + + if (conf->high_priority) + pa_raise_priority(conf->nice_level); + + if (conf->system_instance) + if (change_user() < 0) + goto finish; + + pa_set_env_and_record("PULSE_SYSTEM", conf->system_instance ? "1" : "0"); + + pa_log_info("This is PulseAudio %s", PACKAGE_VERSION); + pa_log_debug("Compilation CFLAGS: %s", PA_CFLAGS); + +#ifdef HAVE_LIBSAMPLERATE + pa_log_warn("Compiled with DEPRECATED libsamplerate support!"); +#endif + + s = pa_uname_string(); + pa_log_debug("Running on host: %s", s); + pa_xfree(s); + + pa_log_debug("Found %u CPUs.", pa_ncpus()); + + pa_log_info("Page size is %zu bytes", pa_page_size()); + +#ifdef HAVE_VALGRIND_MEMCHECK_H + pa_log_debug("Compiled with Valgrind support: yes"); +#else + pa_log_debug("Compiled with Valgrind support: no"); +#endif + + pa_log_debug("Running in valgrind mode: %s", pa_yes_no(pa_in_valgrind())); + + pa_log_debug("Running in VM: %s", pa_yes_no(pa_running_in_vm())); + +#ifdef HAVE_RUNNING_FROM_BUILD_TREE + pa_log_debug("Running from build tree: %s", pa_yes_no(pa_run_from_build_tree())); +#else + pa_log_debug("Running from build tree: no"); +#endif + +#ifdef __OPTIMIZE__ + pa_log_debug("Optimized build: yes"); +#else + pa_log_debug("Optimized build: no"); +#endif + +#ifdef NDEBUG + pa_log_debug("NDEBUG defined, all asserts disabled."); +#elif defined(FASTPATH) + pa_log_debug("FASTPATH defined, only fast path asserts disabled."); +#else + pa_log_debug("All asserts enabled."); +#endif + + if (!(s = pa_machine_id())) { + pa_log(_("Failed to get machine ID")); + goto finish; + } + pa_log_info("Machine ID is %s.", s); + pa_xfree(s); + + if ((s = pa_session_id())) { + pa_log_info("Session ID is %s.", s); + pa_xfree(s); + } + + if (!(s = pa_get_runtime_dir())) + goto finish; + pa_log_info("Using runtime directory %s.", s); + pa_xfree(s); + + if (!(s = pa_get_state_dir())) + goto finish; + pa_log_info("Using state directory %s.", s); + pa_xfree(s); + + pa_log_info("Using modules directory %s.", conf->dl_search_path); + + pa_log_info("Running in system mode: %s", pa_yes_no(pa_in_system_mode())); + + if (pa_in_system_mode()) + pa_log_warn(_("OK, so you are running PA in system mode. Please make sure that you actually do want to do that.\n" + "Please read http://www.freedesktop.org/wiki/Software/PulseAudio/Documentation/User/WhatIsWrongWithSystemWide/ for an explanation why system mode is usually a bad idea.")); + + if (conf->use_pid_file) { + int z; + + if ((z = pa_pid_file_create("pulseaudio")) != 0) { + + if (conf->cmd == PA_CMD_START && z > 0) { + /* If we are already running and with are run in + * --start mode, then let's return this as success. */ + + retval = 0; + goto finish; + } + + pa_log(_("pa_pid_file_create() failed.")); + goto finish; + } + + valid_pid_file = true; + } + + pa_disable_sigpipe(); + + if (pa_rtclock_hrtimer()) + pa_log_info("System supports high resolution timers"); + else + pa_log_info("System appears to not support high resolution timers"); + + if (conf->lock_memory) { +#if defined(HAVE_SYS_MMAN_H) && !defined(__ANDROID__) + if (mlockall(MCL_FUTURE) < 0) + pa_log_warn("mlockall() failed: %s", pa_cstrerror(errno)); + else + pa_log_info("Successfully locked process into memory."); +#else + pa_log_warn("Memory locking requested but not supported on platform."); +#endif + } + + pa_memtrap_install(); + + pa_assert_se(mainloop = pa_mainloop_new()); + + if (!(c = pa_core_new(pa_mainloop_get_api(mainloop), !conf->disable_shm, + !conf->disable_shm && !conf->disable_memfd && pa_memfd_is_locally_supported(), + conf->shm_size))) { + pa_log(_("pa_core_new() failed.")); + goto finish; + } + + c->default_sample_spec = conf->default_sample_spec; + c->alternate_sample_rate = conf->alternate_sample_rate; + c->default_channel_map = conf->default_channel_map; + c->default_n_fragments = conf->default_n_fragments; + c->default_fragment_size_msec = conf->default_fragment_size_msec; + c->deferred_volume_safety_margin_usec = conf->deferred_volume_safety_margin_usec; + c->deferred_volume_extra_delay_usec = conf->deferred_volume_extra_delay_usec; + c->lfe_crossover_freq = conf->lfe_crossover_freq; + c->exit_idle_time = conf->exit_idle_time; + c->scache_idle_time = conf->scache_idle_time; + c->resample_method = conf->resample_method; + c->realtime_priority = conf->realtime_priority; + c->realtime_scheduling = conf->realtime_scheduling; + c->avoid_resampling = conf->avoid_resampling; + c->disable_remixing = conf->disable_remixing; + c->remixing_use_all_sink_channels = conf->remixing_use_all_sink_channels; + c->remixing_produce_lfe = conf->remixing_produce_lfe; + c->remixing_consume_lfe = conf->remixing_consume_lfe; + c->deferred_volume = conf->deferred_volume; + c->running_as_daemon = conf->daemonize; + c->disallow_exit = conf->disallow_exit; + c->flat_volumes = conf->flat_volumes; + c->rescue_streams = conf->rescue_streams; +#ifdef HAVE_DBUS + c->server_type = conf->local_server_type; +#endif + + pa_core_check_idle(c); + + c->state = PA_CORE_RUNNING; + + pa_cpu_init(&c->cpu_info); + + pa_assert_se(pa_signal_init(pa_mainloop_get_api(mainloop)) == 0); + pa_signal_new(SIGINT, signal_callback, c); + pa_signal_new(SIGTERM, signal_callback, c); +#ifdef SIGUSR1 + pa_signal_new(SIGUSR1, signal_callback, c); +#endif +#ifdef SIGUSR2 + pa_signal_new(SIGUSR2, signal_callback, c); +#endif +#ifdef SIGHUP + pa_signal_new(SIGHUP, signal_callback, c); +#endif + + if (!conf->no_cpu_limit) + pa_assert_se(pa_cpu_limit_init(pa_mainloop_get_api(mainloop)) == 0); + + buf = pa_strbuf_new(); + +#ifdef HAVE_DBUS + pa_assert_se(dbus_threads_init_default()); + + if (start_server) +#endif + { + const char *command_source = NULL; + + if (conf->load_default_script_file) { + FILE *f; + + if ((f = pa_daemon_conf_open_default_script_file(conf))) { + r = pa_cli_command_execute_file_stream(c, f, buf, &conf->fail); + fclose(f); + command_source = pa_daemon_conf_get_default_script_file(conf); + } + } + + if (r >= 0) { + r = pa_cli_command_execute(c, conf->script_commands, buf, &conf->fail); + command_source = _("command line arguments"); + } + + pa_log_error("%s", s = pa_strbuf_to_string_free(buf)); + pa_xfree(s); + + if (r < 0 && conf->fail) { + pa_log(_("Failed to initialize daemon due to errors while executing startup commands. Source of commands: %s"), command_source); + goto finish; + } + + if (!c->modules || pa_idxset_size(c->modules) == 0) { + pa_log(_("Daemon startup without any loaded modules, refusing to work.")); + goto finish; + } +#ifdef HAVE_DBUS + } else { + /* When we just provide the D-Bus server lookup service, we don't want + * any modules to be loaded. We haven't loaded any so far, so one might + * think there's no way to contact the server, but receiving certain + * signals could still cause modules to load. */ + conf->disallow_module_loading = true; +#endif + } + + /* We completed the initial module loading, so let's disable it + * from now on, if requested */ + c->disallow_module_loading = conf->disallow_module_loading; + +#ifdef HAVE_DBUS + if (!conf->system_instance) { + if ((server_lookup = pa_dbusobj_server_lookup_new(c))) { + if (!(lookup_service_bus = register_dbus_name(c, DBUS_BUS_SESSION, "org.PulseAudio1"))) + goto finish; + } + } + + if (start_server) + server_bus = register_dbus_name(c, conf->system_instance ? DBUS_BUS_SYSTEM : DBUS_BUS_SESSION, "org.pulseaudio.Server"); +#endif + +#ifdef HAVE_FORK + if (daemon_pipe2[1] >= 0) { + int ok = 0; + pa_loop_write(daemon_pipe2[1], &ok, sizeof(ok), NULL); + pa_close(daemon_pipe2[1]); + daemon_pipe2[1] = -1; + } +#endif + + pa_log_info("Daemon startup complete."); + +#ifdef HAVE_SYSTEMD_DAEMON + sd_notify(0, "READY=1"); +#endif + + retval = 0; + if (pa_mainloop_run(mainloop, &retval) < 0) + goto finish; + + pa_log_info("Daemon shutdown initiated."); + +#ifdef HAVE_SYSTEMD_DAEMON + sd_notify(0, "STOPPING=1"); +#endif + +finish: +#ifdef HAVE_DBUS + if (server_bus) + pa_dbus_connection_unref(server_bus); + if (lookup_service_bus) + pa_dbus_connection_unref(lookup_service_bus); + if (server_lookup) + pa_dbusobj_server_lookup_free(server_lookup); +#endif + + if (autospawn_fd >= 0) { + if (autospawn_locked) + pa_autospawn_lock_release(); + + pa_autospawn_lock_done(false); + } + + if (c) { + /* Ensure all the modules/samples are unloaded when the core is still ref'ed, + * as unlink callback hooks in modules may need the core to be ref'ed */ + pa_module_unload_all(c); + pa_scache_free_all(c); + + pa_core_unref(c); + pa_log_info("Daemon terminated."); + } + + if (!conf->no_cpu_limit) + pa_cpu_limit_done(); + + pa_signal_done(); + +#ifdef HAVE_FORK + /* If we have daemon_pipe[1] still open, this means we've failed after + * the first fork, but before the second. Therefore just write to it. */ + if (daemon_pipe[1] >= 0) + pa_loop_write(daemon_pipe[1], &retval, sizeof(retval), NULL); + else if (daemon_pipe2[1] >= 0) + pa_loop_write(daemon_pipe2[1], &retval, sizeof(retval), NULL); + + pa_close_pipe(daemon_pipe2); + pa_close_pipe(daemon_pipe); +#endif + + if (mainloop) + pa_mainloop_free(mainloop); + + if (conf) + pa_daemon_conf_free(conf); + + if (valid_pid_file) + pa_pid_file_remove(); + + /* This has no real purpose except making things valgrind-clean */ + pa_unset_env_recorded(); + +#ifdef OS_IS_WIN32 + WSACleanup(); +#endif + + if (ltdl_init) + pa_ltdl_done(); + +#ifdef HAVE_DBUS + dbus_shutdown(); +#endif + + return retval; +} |