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-rw-r--r--src/pulse/util.c520
1 files changed, 520 insertions, 0 deletions
diff --git a/src/pulse/util.c b/src/pulse/util.c
new file mode 100644
index 0000000..2be389b
--- /dev/null
+++ b/src/pulse/util.c
@@ -0,0 +1,520 @@
+/***
+ 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
+ Lesser 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 <errno.h>
+#include <limits.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+#include <unistd.h>
+#include <sys/types.h>
+
+#ifdef HAVE_PWD_H
+#include <pwd.h>
+#endif
+
+#ifdef HAVE_NETDB_H
+#include <netdb.h>
+#endif
+
+#ifdef HAVE_WINDOWS_H
+#include <windows.h>
+#endif
+
+#ifdef HAVE_SYS_PRCTL_H
+#include <sys/prctl.h>
+#endif
+
+#ifdef OS_IS_DARWIN
+#include <libgen.h>
+#include <sys/sysctl.h>
+#endif
+
+#include <pulse/xmalloc.h>
+#include <pulse/timeval.h>
+
+#include <pulsecore/socket.h>
+#include <pulsecore/core-error.h>
+#include <pulsecore/core-util.h>
+#include <pulsecore/macro.h>
+#include <pulsecore/usergroup.h>
+
+#include "util.h"
+
+#if defined(HAVE_DLADDR) && defined(PA_GCC_WEAKREF)
+#ifndef _GNU_SOURCE
+#define _GNU_SOURCE 1
+#endif
+#include <dlfcn.h>
+
+static int _main() PA_GCC_WEAKREF(main);
+#endif
+
+#ifdef HAVE_PTHREAD
+#include <pthread.h>
+#endif
+
+#ifdef HAVE_SCHED_H
+#include <sched.h>
+
+#if defined(__linux__) && !defined(SCHED_RESET_ON_FORK)
+#define SCHED_RESET_ON_FORK 0x40000000
+#endif
+#endif
+
+#ifdef __APPLE__
+#include <mach/mach_init.h>
+#include <mach/thread_act.h>
+#include <mach/thread_policy.h>
+#include <sys/sysctl.h>
+#endif
+
+#ifdef HAVE_DBUS
+#include <pulsecore/rtkit.h>
+#endif
+
+char *pa_get_user_name(char *s, size_t l) {
+ const char *p;
+ char *name = NULL;
+#ifdef OS_IS_WIN32
+ char buf[1024];
+#endif
+
+#ifdef HAVE_PWD_H
+ struct passwd *r;
+#endif
+
+ pa_assert(s);
+ pa_assert(l > 0);
+
+ p = NULL;
+#ifdef HAVE_GETUID
+ p = getuid() == 0 ? "root" : NULL;
+#endif
+ if (!p) p = getenv("USER");
+ if (!p) p = getenv("LOGNAME");
+ if (!p) p = getenv("USERNAME");
+
+ if (p) {
+ name = pa_strlcpy(s, p, l);
+ } else {
+#ifdef HAVE_PWD_H
+
+ if ((r = pa_getpwuid_malloc(getuid())) == NULL) {
+ pa_snprintf(s, l, "%lu", (unsigned long) getuid());
+ return s;
+ }
+
+ name = pa_strlcpy(s, r->pw_name, l);
+ pa_getpwuid_free(r);
+
+#elif defined(OS_IS_WIN32) /* HAVE_PWD_H */
+ DWORD size = sizeof(buf);
+
+ if (!GetUserName(buf, &size)) {
+ errno = ENOENT;
+ return NULL;
+ }
+
+ name = pa_strlcpy(s, buf, l);
+
+#else /* HAVE_PWD_H */
+
+ return NULL;
+#endif /* HAVE_PWD_H */
+ }
+
+ return name;
+}
+
+char *pa_get_host_name(char *s, size_t l) {
+
+ pa_assert(s);
+ pa_assert(l > 0);
+
+ if (gethostname(s, l) < 0)
+ return NULL;
+
+ s[l-1] = 0;
+ return s;
+}
+
+char *pa_get_home_dir(char *s, size_t l) {
+ char *e;
+ char *dir;
+#ifdef HAVE_PWD_H
+ struct passwd *r;
+#endif
+
+ pa_assert(s);
+ pa_assert(l > 0);
+
+ if ((e = getenv("HOME"))) {
+ dir = pa_strlcpy(s, e, l);
+ goto finish;
+ }
+
+ if ((e = getenv("USERPROFILE"))) {
+ dir = pa_strlcpy(s, e, l);
+ goto finish;
+ }
+
+#ifdef HAVE_PWD_H
+ errno = 0;
+ if ((r = pa_getpwuid_malloc(getuid())) == NULL) {
+ if (!errno)
+ errno = ENOENT;
+
+ return NULL;
+ }
+
+ dir = pa_strlcpy(s, r->pw_dir, l);
+
+ pa_getpwuid_free(r);
+#endif /* HAVE_PWD_H */
+
+finish:
+ if (!dir) {
+ errno = ENOENT;
+ return NULL;
+ }
+
+ if (!pa_is_path_absolute(dir)) {
+ pa_log("Failed to get the home directory, not an absolute path: %s", dir);
+ errno = ENOENT;
+ return NULL;
+ }
+
+ return dir;
+}
+
+char *pa_get_binary_name(char *s, size_t l) {
+
+ pa_assert(s);
+ pa_assert(l > 0);
+
+#if defined(OS_IS_WIN32)
+ {
+ char path[PATH_MAX];
+
+ if (GetModuleFileName(NULL, path, PATH_MAX))
+ return pa_strlcpy(s, pa_path_get_filename(path), l);
+ }
+#endif
+
+#if defined(__linux__) || defined(__FreeBSD_kernel__)
+ {
+ char *rp;
+ /* This works on Linux and Debian/kFreeBSD */
+
+ if ((rp = pa_readlink("/proc/self/exe"))) {
+ pa_strlcpy(s, pa_path_get_filename(rp), l);
+ pa_xfree(rp);
+ return s;
+ }
+ }
+#endif
+
+#ifdef __FreeBSD__
+ {
+ char *rp;
+
+ if ((rp = pa_readlink("/proc/curproc/file"))) {
+ pa_strlcpy(s, pa_path_get_filename(rp), l);
+ pa_xfree(rp);
+ return s;
+ }
+ }
+#endif
+
+#if defined(HAVE_DLADDR) && defined(PA_GCC_WEAKREF)
+ {
+ Dl_info info;
+ if(_main) {
+ int err = dladdr(&_main, &info);
+ if (err != 0) {
+ char *p = pa_realpath(info.dli_fname);
+ if (p)
+ return p;
+ }
+ }
+ }
+#endif
+
+#if defined(HAVE_SYS_PRCTL_H) && defined(PR_GET_NAME)
+ {
+
+ #ifndef TASK_COMM_LEN
+ /* Actually defined in linux/sched.h */
+ #define TASK_COMM_LEN 16
+ #endif
+
+ char tcomm[TASK_COMM_LEN+1];
+ memset(tcomm, 0, sizeof(tcomm));
+
+ /* This works on Linux only */
+ if (prctl(PR_GET_NAME, (unsigned long) tcomm, 0, 0, 0) == 0)
+ return pa_strlcpy(s, tcomm, l);
+
+ }
+#endif
+
+#ifdef OS_IS_DARWIN
+ {
+ int mib[] = { CTL_KERN, KERN_PROCARGS, getpid(), 0 };
+ size_t len, nmib = (sizeof(mib) / sizeof(mib[0])) - 1;
+ char *buf;
+
+ sysctl(mib, nmib, NULL, &len, NULL, 0);
+ buf = (char *) pa_xmalloc(len);
+
+ if (sysctl(mib, nmib, buf, &len, NULL, 0) == 0) {
+ pa_strlcpy(s, basename(buf), l);
+ pa_xfree(buf);
+ return s;
+ }
+
+ pa_xfree(buf);
+
+ /* fall thru */
+ }
+#endif /* OS_IS_DARWIN */
+
+ errno = ENOENT;
+ return NULL;
+}
+
+char *pa_path_get_filename(const char *p) {
+ char *fn;
+
+ if (!p)
+ return NULL;
+
+ if ((fn = strrchr(p, PA_PATH_SEP_CHAR)))
+ return fn+1;
+
+ return (char*) p;
+}
+
+char *pa_get_fqdn(char *s, size_t l) {
+ char hn[256];
+#ifdef HAVE_GETADDRINFO
+ struct addrinfo *a = NULL, hints;
+#endif
+
+ pa_assert(s);
+ pa_assert(l > 0);
+
+ if (!pa_get_host_name(hn, sizeof(hn)))
+ return NULL;
+
+#ifdef HAVE_GETADDRINFO
+ memset(&hints, 0, sizeof(hints));
+ hints.ai_family = AF_UNSPEC;
+ hints.ai_flags = AI_CANONNAME;
+
+ if (getaddrinfo(hn, NULL, &hints, &a))
+ return pa_strlcpy(s, hn, l);
+
+ if (!a->ai_canonname || !*a->ai_canonname) {
+ freeaddrinfo(a);
+ return pa_strlcpy(s, hn, l);
+ }
+
+ pa_strlcpy(s, a->ai_canonname, l);
+ freeaddrinfo(a);
+ return s;
+#else
+ return pa_strlcpy(s, hn, l);
+#endif
+}
+
+int pa_msleep(unsigned long t) {
+#ifdef OS_IS_WIN32
+ Sleep(t);
+ return 0;
+#elif defined(HAVE_NANOSLEEP)
+ struct timespec ts;
+
+ ts.tv_sec = (time_t) (t / PA_MSEC_PER_SEC);
+ ts.tv_nsec = (long) ((t % PA_MSEC_PER_SEC) * PA_NSEC_PER_MSEC);
+
+ return nanosleep(&ts, NULL);
+#else
+#error "Platform lacks a sleep function."
+#endif
+}
+
+#ifdef _POSIX_PRIORITY_SCHEDULING
+static int set_scheduler(int rtprio) {
+#ifdef HAVE_SCHED_H
+ struct sched_param sp;
+#ifdef HAVE_DBUS
+ int r;
+ long long rttime;
+#ifdef RLIMIT_RTTIME
+ struct rlimit rl;
+#endif
+ DBusError error;
+ DBusConnection *bus;
+
+ dbus_error_init(&error);
+#endif
+
+ pa_zero(sp);
+ sp.sched_priority = rtprio;
+
+#ifdef SCHED_RESET_ON_FORK
+ if (pthread_setschedparam(pthread_self(), SCHED_RR|SCHED_RESET_ON_FORK, &sp) == 0) {
+ pa_log_debug("SCHED_RR|SCHED_RESET_ON_FORK worked.");
+ return 0;
+ }
+#endif
+
+ if (pthread_setschedparam(pthread_self(), SCHED_RR, &sp) == 0) {
+ pa_log_debug("SCHED_RR worked.");
+ return 0;
+ }
+#endif /* HAVE_SCHED_H */
+
+#ifdef HAVE_DBUS
+ /* Try to talk to RealtimeKit */
+
+ if (!(bus = dbus_bus_get_private(DBUS_BUS_SYSTEM, &error))) {
+ pa_log("Failed to connect to system bus: %s", error.message);
+ dbus_error_free(&error);
+ errno = -EIO;
+ return -1;
+ }
+
+ /* We need to disable exit on disconnect because otherwise
+ * dbus_shutdown will kill us. See
+ * https://bugs.freedesktop.org/show_bug.cgi?id=16924 */
+ dbus_connection_set_exit_on_disconnect(bus, FALSE);
+
+ rttime = rtkit_get_rttime_usec_max(bus);
+ if (rttime >= 0) {
+#ifdef RLIMIT_RTTIME
+ r = getrlimit(RLIMIT_RTTIME, &rl);
+
+ if (r >= 0 && (long long) rl.rlim_max > rttime) {
+ pa_log_info("Clamping rlimit-rttime to %lld for RealtimeKit", rttime);
+ rl.rlim_cur = rl.rlim_max = rttime;
+ r = setrlimit(RLIMIT_RTTIME, &rl);
+
+ if (r < 0)
+ pa_log("setrlimit() failed: %s", pa_cstrerror(errno));
+ }
+#endif
+ r = rtkit_make_realtime(bus, 0, rtprio);
+ dbus_connection_close(bus);
+ dbus_connection_unref(bus);
+
+ if (r >= 0) {
+ pa_log_debug("RealtimeKit worked.");
+ return 0;
+ }
+
+ errno = -r;
+ } else {
+ dbus_connection_close(bus);
+ dbus_connection_unref(bus);
+ errno = -rttime;
+ }
+
+#else
+ errno = 0;
+#endif
+
+ return -1;
+}
+#endif
+
+/* Make the current thread a realtime thread, and acquire the highest
+ * rtprio we can get that is less or equal the specified parameter. If
+ * the thread is already realtime, don't do anything. */
+int pa_thread_make_realtime(int rtprio) {
+
+#if defined(OS_IS_DARWIN)
+ struct thread_time_constraint_policy ttcpolicy;
+ uint64_t freq = 0;
+ size_t size = sizeof(freq);
+ int ret;
+
+ ret = sysctlbyname("hw.cpufrequency", &freq, &size, NULL, 0);
+ if (ret < 0) {
+ pa_log_info("Unable to read CPU frequency, acquisition of real-time scheduling failed.");
+ return -1;
+ }
+
+ pa_log_debug("sysctl for hw.cpufrequency: %llu", freq);
+
+ /* See http://developer.apple.com/library/mac/#documentation/Darwin/Conceptual/KernelProgramming/scheduler/scheduler.html */
+ ttcpolicy.period = freq / 160;
+ ttcpolicy.computation = freq / 3300;
+ ttcpolicy.constraint = freq / 2200;
+ ttcpolicy.preemptible = 1;
+
+ ret = thread_policy_set(mach_thread_self(),
+ THREAD_TIME_CONSTRAINT_POLICY,
+ (thread_policy_t) &ttcpolicy,
+ THREAD_TIME_CONSTRAINT_POLICY_COUNT);
+ if (ret) {
+ pa_log_info("Unable to set real-time thread priority (%08x).", ret);
+ return -1;
+ }
+
+ pa_log_info("Successfully acquired real-time thread priority.");
+ return 0;
+
+#elif defined(_POSIX_PRIORITY_SCHEDULING)
+ int p;
+
+ if (set_scheduler(rtprio) >= 0) {
+ pa_log_info("Successfully enabled SCHED_RR scheduling for thread, with priority %i.", rtprio);
+ return 0;
+ }
+
+ for (p = rtprio-1; p >= 1; p--)
+ if (set_scheduler(p) >= 0) {
+ pa_log_info("Successfully enabled SCHED_RR scheduling for thread, with priority %i, which is lower than the requested %i.", p, rtprio);
+ return 0;
+ }
+#elif defined(OS_IS_WIN32)
+ /* Windows only allows realtime scheduling to be set on a per process basis.
+ * Therefore, instead of making the thread realtime, just give it the highest non-realtime priority. */
+ if (SetThreadPriority(GetCurrentThread(), THREAD_PRIORITY_TIME_CRITICAL)) {
+ pa_log_info("Successfully enabled THREAD_PRIORITY_TIME_CRITICAL scheduling for thread.");
+ return 0;
+ }
+
+ pa_log_warn("SetThreadPriority() failed: 0x%08X", GetLastError());
+ errno = EPERM;
+#else
+ errno = ENOTSUP;
+#endif
+ pa_log_info("Failed to acquire real-time scheduling: %s", pa_cstrerror(errno));
+ return -1;
+}
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