src/shared/log.c - systemd-stable - Rivoreo Source Code Repositories

 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/

 /***
   This file is part of systemd.

   Copyright 2010 Lennart Poettering

   systemd 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.

   systemd 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 systemd; If not, see <http://www.gnu.org/licenses/>.
 ***/

 #include <stdarg.h>
 #include <stdio.h>
 #include <errno.h>
 #include <unistd.h>
 #include <fcntl.h>
 #include <sys/socket.h>
 #include <sys/un.h>
 #include <stddef.h>
 #include <printf.h>

 #include "log.h"
 #include "util.h"
 #include "missing.h"
 #include "macro.h"
 #include "socket-util.h"

 #define SNDBUF_SIZE (8*1024*1024)

 static LogTarget log_target = LOG_TARGET_CONSOLE;
 static int log_max_level = LOG_INFO;
 static int log_facility = LOG_DAEMON;

 static int console_fd = STDERR_FILENO;
 static int syslog_fd = -1;
 static int kmsg_fd = -1;
 static int journal_fd = -1;

 static bool syslog_is_stream = false;

 static bool show_color = false;
 static bool show_location = false;

 /* Akin to glibc's __abort_msg; which is private and we hence cannot
  * use here. */
 static char *log_abort_msg = NULL;

 void log_close_console(void) {

         if (console_fd < 0)
                 return;

         if (getpid() == 1) {
                 if (console_fd >= 3)
                         close_nointr_nofail(console_fd);

                 console_fd = -1;
         }
 }

 static int log_open_console(void) {

         if (console_fd >= 0)
                 return 0;

         if (getpid() == 1) {
                 console_fd = open_terminal("/dev/console", O_WRONLY|O_NOCTTY|O_CLOEXEC);
                 if (console_fd < 0)
                         return console_fd;
         } else
                 console_fd = STDERR_FILENO;

         return 0;
 }

 void log_close_kmsg(void) {

         if (kmsg_fd < 0)
                 return;

         close_nointr_nofail(kmsg_fd);
         kmsg_fd = -1;
 }

 static int log_open_kmsg(void) {

         if (kmsg_fd >= 0)
                 return 0;

         kmsg_fd = open("/dev/kmsg", O_WRONLY|O_NOCTTY|O_CLOEXEC);
         if (kmsg_fd < 0)
                 return -errno;

         return 0;
 }

 void log_close_syslog(void) {

         if (syslog_fd < 0)
                 return;

         close_nointr_nofail(syslog_fd);
         syslog_fd = -1;
 }

 static int create_log_socket(int type) {
         int fd;
         struct timeval tv;

         fd = socket(AF_UNIX, type|SOCK_CLOEXEC, 0);
         if (fd < 0)
                 return -errno;

         fd_inc_sndbuf(fd, SNDBUF_SIZE);

         /* We need a blocking fd here since we'd otherwise lose
         messages way too early. However, let's not hang forever in the
         unlikely case of a deadlock. */
         if (getpid() == 1)
                 timeval_store(&tv, 10 * USEC_PER_MSEC);
         else
                 timeval_store(&tv, 10 * USEC_PER_SEC);
         setsockopt(fd, SOL_SOCKET, SO_SNDTIMEO, &tv, sizeof(tv));

         return fd;
 }

 static int log_open_syslog(void) {
         int r;
         union sockaddr_union sa = {
                 .un.sun_family = AF_UNIX,
                 .un.sun_path = "/dev/log",
         };

         if (syslog_fd >= 0)
                 return 0;

         syslog_fd = create_log_socket(SOCK_DGRAM);
         if (syslog_fd < 0) {
                 r = syslog_fd;
                 goto fail;
         }

         if (connect(syslog_fd, &sa.sa, offsetof(struct sockaddr_un, sun_path) + strlen(sa.un.sun_path)) < 0) {
                 close_nointr_nofail(syslog_fd);

                 /* Some legacy syslog systems still use stream
                  * sockets. They really shouldn't. But what can we
                  * do... */
                 syslog_fd = create_log_socket(SOCK_STREAM);
                 if (syslog_fd < 0) {
                         r = syslog_fd;
                         goto fail;
                 }

                 if (connect(syslog_fd, &sa.sa, offsetof(struct sockaddr_un, sun_path) + strlen(sa.un.sun_path)) < 0) {
                         r = -errno;
                         goto fail;
                 }

                 syslog_is_stream = true;
         } else
                 syslog_is_stream = false;

         return 0;

 fail:
         log_close_syslog();
         return r;
 }

 void log_close_journal(void) {

         if (journal_fd < 0)
                 return;

         close_nointr_nofail(journal_fd);
         journal_fd = -1;
 }

 static int log_open_journal(void) {
         union sockaddr_union sa = {
                 .un.sun_family = AF_UNIX,
                 .un.sun_path = "/run/systemd/journal/socket",
         };
         int r;

         if (journal_fd >= 0)
                 return 0;

         journal_fd = create_log_socket(SOCK_DGRAM);
         if (journal_fd < 0) {
                 r = journal_fd;
                 goto fail;
         }

         if (connect(journal_fd, &sa.sa, offsetof(struct sockaddr_un, sun_path) + strlen(sa.un.sun_path)) < 0) {
                 r = -errno;
                 goto fail;
         }

         return 0;

 fail:
         log_close_journal();
         return r;
 }

 int log_open(void) {
         int r;

         /* If we don't use the console we close it here, to not get
          * killed by SAK. If we don't use syslog we close it here so
          * that we are not confused by somebody deleting the socket in
          * the fs. If we don't use /dev/kmsg we still keep it open,
          * because there is no reason to close it. */

         if (log_target == LOG_TARGET_NULL) {
                 log_close_journal();
                 log_close_syslog();
                 log_close_console();
                 return 0;
         }

         if ((log_target != LOG_TARGET_AUTO && log_target != LOG_TARGET_SAFE) ||
             getpid() == 1 ||
             isatty(STDERR_FILENO) <= 0) {

                 if (log_target == LOG_TARGET_AUTO ||
                     log_target == LOG_TARGET_JOURNAL_OR_KMSG ||
                     log_target == LOG_TARGET_JOURNAL) {
                         r = log_open_journal();
                         if (r >= 0) {
                                 log_close_syslog();
                                 log_close_console();
                                 return r;
                         }
                 }

                 if (log_target == LOG_TARGET_SYSLOG_OR_KMSG ||
                     log_target == LOG_TARGET_SYSLOG) {
                         r = log_open_syslog();
                         if (r >= 0) {
                                 log_close_journal();
                                 log_close_console();
                                 return r;
                         }
                 }

                 if (log_target == LOG_TARGET_AUTO ||
                     log_target == LOG_TARGET_SAFE ||
                     log_target == LOG_TARGET_JOURNAL_OR_KMSG ||
                     log_target == LOG_TARGET_SYSLOG_OR_KMSG ||
                     log_target == LOG_TARGET_KMSG) {
                         r = log_open_kmsg();
                         if (r >= 0) {
                                 log_close_journal();
                                 log_close_syslog();
                                 log_close_console();
                                 return r;
                         }
                 }
         }

         log_close_journal();
         log_close_syslog();

         return log_open_console();
 }

 void log_set_target(LogTarget target) {
         assert(target >= 0);
         assert(target < _LOG_TARGET_MAX);

         log_target = target;
 }

 void log_close(void) {
         log_close_journal();
         log_close_syslog();
         log_close_kmsg();
         log_close_console();
 }

 void log_forget_fds(void) {
         console_fd = kmsg_fd = syslog_fd = journal_fd = -1;
 }

 void log_set_max_level(int level) {
         assert((level & LOG_PRIMASK) == level);

         log_max_level = level;
 }

 void log_set_facility(int facility) {
         log_facility = facility;
 }

 static int write_to_console(
                 int level,
                 const char*file,
                 int line,
                 const char *func,
                 const char *object_name,
                 const char *object,
                 const char *buffer) {

         char location[64];
         struct iovec iovec[5] = {};
         unsigned n = 0;
         bool highlight;

         if (console_fd < 0)
                 return 0;

         highlight = LOG_PRI(level) <= LOG_ERR && show_color;

         if (show_location) {
                 snprintf(location, sizeof(location), "(%s:%u) ", file, line);
                 char_array_0(location);
                 IOVEC_SET_STRING(iovec[n++], location);
         }

         if (highlight)
                 IOVEC_SET_STRING(iovec[n++], ANSI_HIGHLIGHT_RED_ON);
         IOVEC_SET_STRING(iovec[n++], buffer);
         if (highlight)
                 IOVEC_SET_STRING(iovec[n++], ANSI_HIGHLIGHT_OFF);
         IOVEC_SET_STRING(iovec[n++], "\n");

         if (writev(console_fd, iovec, n) < 0) {

                 if (errno == EIO && getpid() == 1) {

                         /* If somebody tried to kick us from our
                          * console tty (via vhangup() or suchlike),
                          * try to reconnect */

                         log_close_console();
                         log_open_console();

                         if (console_fd < 0)
                                 return 0;

                         if (writev(console_fd, iovec, n) < 0)
                                 return -errno;
                 } else
                         return -errno;
         }

         return 1;
 }

 static int write_to_syslog(
         int level,
         const char*file,
         int line,
         const char *func,
         const char *object_name,
         const char *object,
         const char *buffer) {

         char header_priority[16], header_time[64], header_pid[16];
         struct iovec iovec[5] = {};
         struct msghdr msghdr = {
                 .msg_iov = iovec,
                 .msg_iovlen = ELEMENTSOF(iovec),
         };
         time_t t;
         struct tm *tm;

         if (syslog_fd < 0)
                 return 0;

         snprintf(header_priority, sizeof(header_priority), "<%i>", level);
         char_array_0(header_priority);

         t = (time_t) (now(CLOCK_REALTIME) / USEC_PER_SEC);
         tm = localtime(&t);
         if (!tm)
                 return -EINVAL;

         if (strftime(header_time, sizeof(header_time), "%h %e %T ", tm) <= 0)
                 return -EINVAL;

         snprintf(header_pid, sizeof(header_pid), "[%lu]: ", (unsigned long) getpid());
         char_array_0(header_pid);

         IOVEC_SET_STRING(iovec[0], header_priority);
         IOVEC_SET_STRING(iovec[1], header_time);
         IOVEC_SET_STRING(iovec[2], program_invocation_short_name);
         IOVEC_SET_STRING(iovec[3], header_pid);
         IOVEC_SET_STRING(iovec[4], buffer);

         /* When using syslog via SOCK_STREAM separate the messages by NUL chars */
         if (syslog_is_stream)
                 iovec[4].iov_len++;

         for (;;) {
                 ssize_t n;

                 n = sendmsg(syslog_fd, &msghdr, MSG_NOSIGNAL);
                 if (n < 0)
                         return -errno;

                 if (!syslog_is_stream ||
                     (size_t) n >= IOVEC_TOTAL_SIZE(iovec, ELEMENTSOF(iovec)))
                         break;

                 IOVEC_INCREMENT(iovec, ELEMENTSOF(iovec), n);
         }

         return 1;
 }

 static int write_to_kmsg(
         int level,
         const char*file,
         int line,
         const char *func,
         const char *object_name,
         const char *object,
         const char *buffer) {

         char header_priority[16], header_pid[16];
         struct iovec iovec[5] = {};

         if (kmsg_fd < 0)
                 return 0;

         snprintf(header_priority, sizeof(header_priority), "<%i>", level);
         char_array_0(header_priority);

         snprintf(header_pid, sizeof(header_pid), "[%lu]: ", (unsigned long) getpid());
         char_array_0(header_pid);

         IOVEC_SET_STRING(iovec[0], header_priority);
         IOVEC_SET_STRING(iovec[1], program_invocation_short_name);
         IOVEC_SET_STRING(iovec[2], header_pid);
         IOVEC_SET_STRING(iovec[3], buffer);
         IOVEC_SET_STRING(iovec[4], "\n");

         if (writev(kmsg_fd, iovec, ELEMENTSOF(iovec)) < 0)
                 return -errno;

         return 1;
 }

 static int log_do_header(char *header, size_t size,
                          int level,
                          const char *file, int line, const char *func,
                          const char *object_name, const char *object) {
         snprintf(header, size,
                  "PRIORITY=%i\n"
                  "SYSLOG_FACILITY=%i\n"
                  "%s%.*s%s"
                  "%s%.*i%s"
                  "%s%.*s%s"
                  "%s%.*s%s"
                  "SYSLOG_IDENTIFIER=%s\n",
                  LOG_PRI(level),
                  LOG_FAC(level),
                  file ? "CODE_FILE=" : "",
                  file ? LINE_MAX : 0, file, /* %.0s means no output */
                  file ? "\n" : "",
                  line ? "CODE_LINE=" : "",
                  line ? 1 : 0, line, /* %.0d means no output too, special case for 0 */
                  line ? "\n" : "",
                  func ? "CODE_FUNCTION=" : "",
                  func ? LINE_MAX : 0, func,
                  func ? "\n" : "",
                  object ? object_name : "",
                  object ? LINE_MAX : 0, object, /* %.0s means no output */
                  object ? "\n" : "",
                  program_invocation_short_name);
         header[size - 1] = '\0';
         return 0;
 }

 static int write_to_journal(
         int level,
         const char*file,
         int line,
         const char *func,
         const char *object_name,
         const char *object,
         const char *buffer) {

         char header[LINE_MAX];
         struct iovec iovec[4] = {};
         struct msghdr mh = {};

         if (journal_fd < 0)
                 return 0;

         log_do_header(header, sizeof(header), level,
                       file, line, func, object_name, object);

         IOVEC_SET_STRING(iovec[0], header);
         IOVEC_SET_STRING(iovec[1], "MESSAGE=");
         IOVEC_SET_STRING(iovec[2], buffer);
         IOVEC_SET_STRING(iovec[3], "\n");

         mh.msg_iov = iovec;
         mh.msg_iovlen = ELEMENTSOF(iovec);

         if (sendmsg(journal_fd, &mh, MSG_NOSIGNAL) < 0)
                 return -errno;

         return 1;
 }

 static int log_dispatch(
         int level,
         const char*file,
         int line,
         const char *func,
         const char *object_name,
         const char *object,
         char *buffer) {

         int r = 0;

         if (log_target == LOG_TARGET_NULL)
                 return 0;

         /* Patch in LOG_DAEMON facility if necessary */
         if ((level & LOG_FACMASK) == 0)
                 level = log_facility | LOG_PRI(level);

         do {
                 char *e;
                 int k = 0;

                 buffer += strspn(buffer, NEWLINE);

                 if (buffer[0] == 0)
                         break;

                 if ((e = strpbrk(buffer, NEWLINE)))
                         *(e++) = 0;

                 if (log_target == LOG_TARGET_AUTO ||
                     log_target == LOG_TARGET_JOURNAL_OR_KMSG ||
                     log_target == LOG_TARGET_JOURNAL) {

                         k = write_to_journal(level, file, line, func,
                                              object_name, object, buffer);
                         if (k < 0) {
                                 if (k != -EAGAIN)
                                         log_close_journal();
                                 log_open_kmsg();
                         } else if (k > 0)
                                 r++;
                 }

                 if (log_target == LOG_TARGET_SYSLOG_OR_KMSG ||
                     log_target == LOG_TARGET_SYSLOG) {

                         k = write_to_syslog(level, file, line, func,
                                             object_name, object, buffer);
                         if (k < 0) {
                                 if (k != -EAGAIN)
                                         log_close_syslog();
                                 log_open_kmsg();
                         } else if (k > 0)
                                 r++;
                 }

                 if (k <= 0 &&
                     (log_target == LOG_TARGET_AUTO ||
                      log_target == LOG_TARGET_SAFE ||
                      log_target == LOG_TARGET_SYSLOG_OR_KMSG ||
                      log_target == LOG_TARGET_JOURNAL_OR_KMSG ||
                      log_target == LOG_TARGET_KMSG)) {

                         k = write_to_kmsg(level, file, line, func,
                                           object_name, object, buffer);
                         if (k < 0) {
                                 log_close_kmsg();
                                 log_open_console();
                         } else if (k > 0)
                                 r++;
                 }

                 if (k <= 0) {
                         k = write_to_console(level, file, line, func,
                                              object_name, object, buffer);
                         if (k < 0)
                                 return k;
                 }

                 buffer = e;
         } while (buffer);

         return r;
 }

 int log_dump_internal(
         int level,
         const char*file,
         int line,
         const char *func,
         char *buffer) {

         PROTECT_ERRNO;

         /* This modifies the buffer... */

         if (_likely_(LOG_PRI(level) > log_max_level))
                 return 0;

         return log_dispatch(level, file, line, func, NULL, NULL, buffer);
 }

 int log_metav(
         int level,
         const char*file,
         int line,
         const char *func,
         const char *format,
         va_list ap) {

         PROTECT_ERRNO;
         char buffer[LINE_MAX];

         if (_likely_(LOG_PRI(level) > log_max_level))
                 return 0;

         vsnprintf(buffer, sizeof(buffer), format, ap);
         char_array_0(buffer);

         return log_dispatch(level, file, line, func, NULL, NULL, buffer);
 }

 int log_meta(
         int level,
         const char*file,
         int line,
         const char *func,
         const char *format, ...) {

         int r;
         va_list ap;

         va_start(ap, format);
         r = log_metav(level, file, line, func, format, ap);
         va_end(ap);

         return r;
 }

 int log_metav_object(
         int level,
         const char*file,
         int line,
         const char *func,
         const char *object_name,
         const char *object,
         const char *format,
         va_list ap) {

         PROTECT_ERRNO;
         char buffer[LINE_MAX];

         if (_likely_(LOG_PRI(level) > log_max_level))
                 return 0;

         vsnprintf(buffer, sizeof(buffer), format, ap);
         char_array_0(buffer);

         return log_dispatch(level, file, line, func,
                             object_name, object, buffer);
 }

 int log_meta_object(
         int level,
         const char*file,
         int line,
         const char *func,
         const char *object_name,
         const char *object,
         const char *format, ...) {

         int r;
         va_list ap;

         va_start(ap, format);
         r = log_metav_object(level, file, line, func,
                              object_name, object, format, ap);
         va_end(ap);

         return r;
 }

 static void log_assert(int level, const char *text, const char *file, int line, const char *func, const char *format) {
         static char buffer[LINE_MAX];

         if (_likely_(LOG_PRI(level) > log_max_level))
                 return;

         DISABLE_WARNING_FORMAT_NONLITERAL;
         snprintf(buffer, sizeof(buffer), format, text, file, line, func);
         REENABLE_WARNING;

         char_array_0(buffer);
         log_abort_msg = buffer;

         log_dispatch(level, file, line, func, NULL, NULL, buffer);
 }

 noreturn void log_assert_failed(const char *text, const char *file, int line, const char *func) {
         log_assert(LOG_CRIT, text, file, line, func, "Assertion '%s' failed at %s:%u, function %s(). Aborting.");
         abort();
 }

 noreturn void log_assert_failed_unreachable(const char *text, const char *file, int line, const char *func) {
         log_assert(LOG_CRIT, text, file, line, func, "Code should not be reached '%s' at %s:%u, function %s(). Aborting.");
         abort();
 }

 void log_assert_failed_return(const char *text, const char *file, int line, const char *func) {
         PROTECT_ERRNO;
         log_assert(LOG_DEBUG, text, file, line, func, "Assertion '%s' failed at %s:%u, function %s(). Ignoring.");
 }

 int log_oom_internal(const char *file, int line, const char *func) {
         log_meta(LOG_ERR, file, line, func, "Out of memory.");
         return -ENOMEM;
 }

 int log_struct_internal(
                 int level,
                 const char *file,
                 int line,
                 const char *func,
                 const char *format, ...) {

         PROTECT_ERRNO;
         va_list ap;
         int r;

         if (_likely_(LOG_PRI(level) > log_max_level))
                 return 0;

         if (log_target == LOG_TARGET_NULL)
                 return 0;

         if ((level & LOG_FACMASK) == 0)
                 level = log_facility | LOG_PRI(level);

         if ((log_target == LOG_TARGET_AUTO ||
              log_target == LOG_TARGET_JOURNAL_OR_KMSG ||
              log_target == LOG_TARGET_JOURNAL) &&
             journal_fd >= 0) {

                 char header[LINE_MAX];
                 struct iovec iovec[17] = {};
                 unsigned n = 0, i;
                 struct msghdr mh = {
                         .msg_iov = iovec,
                 };
                 static const char nl = '\n';

                 /* If the journal is available do structured logging */
                 log_do_header(header, sizeof(header), level,
                               file, line, func, NULL, NULL);
                 IOVEC_SET_STRING(iovec[n++], header);

                 va_start(ap, format);
                 while (format && n + 1 < ELEMENTSOF(iovec)) {
                         char *buf;
                         va_list aq;

                         /* We need to copy the va_list structure,
                          * since vasprintf() leaves it afterwards at
                          * an undefined location */

                         va_copy(aq, ap);
                         if (vasprintf(&buf, format, aq) < 0) {
                                 va_end(aq);
                                 r = -ENOMEM;
                                 goto finish;
                         }
                         va_end(aq);

                         /* Now, jump enough ahead, so that we point to
                          * the next format string */
                         VA_FORMAT_ADVANCE(format, ap);

                         IOVEC_SET_STRING(iovec[n++], buf);

                         iovec[n].iov_base = (char*) &nl;
                         iovec[n].iov_len = 1;
                         n++;

                         format = va_arg(ap, char *);
                 }

                 mh.msg_iovlen = n;

                 if (sendmsg(journal_fd, &mh, MSG_NOSIGNAL) < 0)
                         r = -errno;
                 else
                         r = 1;

         finish:
                 va_end(ap);
                 for (i = 1; i < n; i += 2)
                         free(iovec[i].iov_base);

         } else {
                 char buf[LINE_MAX];
                 bool found = false;

                 /* Fallback if journal logging is not available */

                 va_start(ap, format);
                 while (format) {
                         va_list aq;

                         va_copy(aq, ap);
                         vsnprintf(buf, sizeof(buf), format, aq);
                         va_end(aq);
                         char_array_0(buf);

                         if (startswith(buf, "MESSAGE=")) {
                                 found = true;
                                 break;
                         }

                         VA_FORMAT_ADVANCE(format, ap);

                         format = va_arg(ap, char *);
                 }
                 va_end(ap);

                 if (found)
                         r = log_dispatch(level, file, line, func,
                                          NULL, NULL, buf + 8);
                 else
                         r = -EINVAL;
         }

         return r;
 }

 int log_set_target_from_string(const char *e) {
         LogTarget t;

         t = log_target_from_string(e);
         if (t < 0)
                 return -EINVAL;

         log_set_target(t);
         return 0;
 }

 int log_set_max_level_from_string(const char *e) {
         int t;

         t = log_level_from_string(e);
         if (t < 0)
                 return t;

         log_set_max_level(t);
         return 0;
 }

 void log_parse_environment(void) {
         _cleanup_free_ char *line = NULL;
         const char *e;
         int r;

         r = proc_cmdline(&line);
         if (r < 0)
                 log_warning("Failed to read /proc/cmdline. Ignoring: %s", strerror(-r));
         else if (r > 0) {
                 char *w, *state;
                 size_t l;

                 FOREACH_WORD_QUOTED(w, l, line, state) {
                         if (l == 5 && startswith(w, "debug")) {
                                 log_set_max_level(LOG_DEBUG);
                                 break;
                         }
                 }
         }

         e = secure_getenv("SYSTEMD_LOG_TARGET");
         if (e && log_set_target_from_string(e) < 0)
                 log_warning("Failed to parse log target %s. Ignoring.", e);

         e = secure_getenv("SYSTEMD_LOG_LEVEL");
         if (e && log_set_max_level_from_string(e) < 0)
                 log_warning("Failed to parse log level %s. Ignoring.", e);

         e = secure_getenv("SYSTEMD_LOG_COLOR");
         if (e && log_show_color_from_string(e) < 0)
                 log_warning("Failed to parse bool %s. Ignoring.", e);

         e = secure_getenv("SYSTEMD_LOG_LOCATION");
         if (e && log_show_location_from_string(e) < 0)
                 log_warning("Failed to parse bool %s. Ignoring.", e);
 }

 LogTarget log_get_target(void) {
         return log_target;
 }

 int log_get_max_level(void) {
         return log_max_level;
 }

 void log_show_color(bool b) {
         show_color = b;
 }

 bool log_get_show_color(void) {
         return show_color;
 }

 void log_show_location(bool b) {
         show_location = b;
 }

 bool log_get_show_location(void) {
         return show_location;
 }

 int log_show_color_from_string(const char *e) {
         int t;

         t = parse_boolean(e);
         if (t < 0)
                 return t;

         log_show_color(t);
         return 0;
 }

 int log_show_location_from_string(const char *e) {
         int t;

         t = parse_boolean(e);
         if (t < 0)
                 return t;

         log_show_location(t);
         return 0;
 }

 bool log_on_console(void) {
         if (log_target == LOG_TARGET_CONSOLE)
                 return true;

         return syslog_fd < 0 && kmsg_fd < 0 && journal_fd < 0;
 }

 static const char *const log_target_table[] = {
         [LOG_TARGET_CONSOLE] = "console",
         [LOG_TARGET_KMSG] = "kmsg",
         [LOG_TARGET_JOURNAL] = "journal",
         [LOG_TARGET_JOURNAL_OR_KMSG] = "journal-or-kmsg",
         [LOG_TARGET_SYSLOG] = "syslog",
         [LOG_TARGET_SYSLOG_OR_KMSG] = "syslog-or-kmsg",
         [LOG_TARGET_AUTO] = "auto",
         [LOG_TARGET_SAFE] = "safe",
         [LOG_TARGET_NULL] = "null"
 };

 DEFINE_STRING_TABLE_LOOKUP(log_target, LogTarget);

 void log_received_signal(int level, const struct signalfd_siginfo *si) {
         if (si->ssi_pid > 0) {
                 _cleanup_free_ char *p = NULL;

                 get_process_comm(si->ssi_pid, &p);

                 log_full(level,
                          "Received SIG%s from PID "PID_FMT" (%s).",
                          signal_to_string(si->ssi_signo),
                          si->ssi_pid, strna(p));
         } else
                 log_full(level,
                          "Received SIG%s.",
                          signal_to_string(si->ssi_signo));

 }
	/-- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil --/

	/***
	This file is part of systemd.

	Copyright 2010 Lennart Poettering

	systemd 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.

	systemd 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 systemd; If not, see <http://www.gnu.org/licenses/>.
	***/

	#include <stdarg.h>
	#include <stdio.h>
	#include <errno.h>
	#include <unistd.h>
	#include <fcntl.h>
	#include <sys/socket.h>
	#include <sys/un.h>
	#include <stddef.h>
	#include <printf.h>

	#include "log.h"
	#include "util.h"
	#include "missing.h"
	#include "macro.h"
	#include "socket-util.h"

	#define SNDBUF_SIZE (810241024)

	static LogTarget log_target = LOG_TARGET_CONSOLE;
	static int log_max_level = LOG_INFO;
	static int log_facility = LOG_DAEMON;

	static int console_fd = STDERR_FILENO;
	static int syslog_fd = -1;
	static int kmsg_fd = -1;
	static int journal_fd = -1;

	static bool syslog_is_stream = false;

	static bool show_color = false;
	static bool show_location = false;

	/* Akin to glibc's __abort_msg; which is private and we hence cannot
	* use here. */
	static char *log_abort_msg = NULL;

	void log_close_console(void) {

	if (console_fd < 0)
	return;

	if (getpid() == 1) {
	if (console_fd >= 3)
	close_nointr_nofail(console_fd);

	console_fd = -1;
	}
	}

	static int log_open_console(void) {

	if (console_fd >= 0)
	return 0;

	if (getpid() == 1) {
	console_fd = open_terminal("/dev/console", O_WRONLY\|O_NOCTTY\|O_CLOEXEC);
	if (console_fd < 0)
	return console_fd;
	} else
	console_fd = STDERR_FILENO;

	return 0;
	}

	void log_close_kmsg(void) {

	if (kmsg_fd < 0)
	return;

	close_nointr_nofail(kmsg_fd);
	kmsg_fd = -1;
	}

	static int log_open_kmsg(void) {

	if (kmsg_fd >= 0)
	return 0;

	kmsg_fd = open("/dev/kmsg", O_WRONLY\|O_NOCTTY\|O_CLOEXEC);
	if (kmsg_fd < 0)
	return -errno;

	return 0;
	}

	void log_close_syslog(void) {

	if (syslog_fd < 0)
	return;

	close_nointr_nofail(syslog_fd);
	syslog_fd = -1;
	}

	static int create_log_socket(int type) {
	int fd;
	struct timeval tv;

	fd = socket(AF_UNIX, type\|SOCK_CLOEXEC, 0);
	if (fd < 0)
	return -errno;

	fd_inc_sndbuf(fd, SNDBUF_SIZE);

	/* We need a blocking fd here since we'd otherwise lose
	messages way too early. However, let's not hang forever in the
	unlikely case of a deadlock. */
	if (getpid() == 1)
	timeval_store(&tv, 10 * USEC_PER_MSEC);
	else
	timeval_store(&tv, 10 * USEC_PER_SEC);
	setsockopt(fd, SOL_SOCKET, SO_SNDTIMEO, &tv, sizeof(tv));

	return fd;
	}

	static int log_open_syslog(void) {
	int r;
	union sockaddr_union sa = {
	.un.sun_family = AF_UNIX,
	.un.sun_path = "/dev/log",
	};

	if (syslog_fd >= 0)
	return 0;

	syslog_fd = create_log_socket(SOCK_DGRAM);
	if (syslog_fd < 0) {
	r = syslog_fd;
	goto fail;
	}

	if (connect(syslog_fd, &sa.sa, offsetof(struct sockaddr_un, sun_path) + strlen(sa.un.sun_path)) < 0) {
	close_nointr_nofail(syslog_fd);

	/* Some legacy syslog systems still use stream
	* sockets. They really shouldn't. But what can we
	* do... */
	syslog_fd = create_log_socket(SOCK_STREAM);
	if (syslog_fd < 0) {
	r = syslog_fd;
	goto fail;
	}

	if (connect(syslog_fd, &sa.sa, offsetof(struct sockaddr_un, sun_path) + strlen(sa.un.sun_path)) < 0) {
	r = -errno;
	goto fail;
	}

	syslog_is_stream = true;
	} else
	syslog_is_stream = false;

	return 0;

	fail:
	log_close_syslog();
	return r;
	}

	void log_close_journal(void) {

	if (journal_fd < 0)
	return;

	close_nointr_nofail(journal_fd);
	journal_fd = -1;
	}

	static int log_open_journal(void) {
	union sockaddr_union sa = {
	.un.sun_family = AF_UNIX,
	.un.sun_path = "/run/systemd/journal/socket",
	};
	int r;

	if (journal_fd >= 0)
	return 0;

	journal_fd = create_log_socket(SOCK_DGRAM);
	if (journal_fd < 0) {
	r = journal_fd;
	goto fail;
	}

	if (connect(journal_fd, &sa.sa, offsetof(struct sockaddr_un, sun_path) + strlen(sa.un.sun_path)) < 0) {
	r = -errno;
	goto fail;
	}

	return 0;

	fail:
	log_close_journal();
	return r;
	}

	int log_open(void) {
	int r;

	/* If we don't use the console we close it here, to not get
	* killed by SAK. If we don't use syslog we close it here so
	* that we are not confused by somebody deleting the socket in
	* the fs. If we don't use /dev/kmsg we still keep it open,
	* because there is no reason to close it. */

	if (log_target == LOG_TARGET_NULL) {
	log_close_journal();
	log_close_syslog();
	log_close_console();
	return 0;
	}

	if ((log_target != LOG_TARGET_AUTO && log_target != LOG_TARGET_SAFE) \|\|
	getpid() == 1 \|\|
	isatty(STDERR_FILENO) <= 0) {

	if (log_target == LOG_TARGET_AUTO \|\|
	log_target == LOG_TARGET_JOURNAL_OR_KMSG \|\|
	log_target == LOG_TARGET_JOURNAL) {
	r = log_open_journal();
	if (r >= 0) {
	log_close_syslog();
	log_close_console();
	return r;
	}
	}

	if (log_target == LOG_TARGET_SYSLOG_OR_KMSG \|\|
	log_target == LOG_TARGET_SYSLOG) {
	r = log_open_syslog();
	if (r >= 0) {
	log_close_journal();
	log_close_console();
	return r;
	}
	}

	if (log_target == LOG_TARGET_AUTO \|\|
	log_target == LOG_TARGET_SAFE \|\|
	log_target == LOG_TARGET_JOURNAL_OR_KMSG \|\|
	log_target == LOG_TARGET_SYSLOG_OR_KMSG \|\|
	log_target == LOG_TARGET_KMSG) {
	r = log_open_kmsg();
	if (r >= 0) {
	log_close_journal();
	log_close_syslog();
	log_close_console();
	return r;
	}
	}
	}

	log_close_journal();
	log_close_syslog();

	return log_open_console();
	}

	void log_set_target(LogTarget target) {
	assert(target >= 0);
	assert(target < _LOG_TARGET_MAX);

	log_target = target;
	}

	void log_close(void) {
	log_close_journal();
	log_close_syslog();
	log_close_kmsg();
	log_close_console();
	}

	void log_forget_fds(void) {
	console_fd = kmsg_fd = syslog_fd = journal_fd = -1;
	}

	void log_set_max_level(int level) {
	assert((level & LOG_PRIMASK) == level);

	log_max_level = level;
	}

	void log_set_facility(int facility) {
	log_facility = facility;
	}

	static int write_to_console(
	int level,
	const char*file,
	int line,
	const char *func,
	const char *object_name,
	const char *object,
	const char *buffer) {

	char location[64];
	struct iovec iovec[5] = {};
	unsigned n = 0;
	bool highlight;

	if (console_fd < 0)
	return 0;

	highlight = LOG_PRI(level) <= LOG_ERR && show_color;

	if (show_location) {
	snprintf(location, sizeof(location), "(%s:%u) ", file, line);
	char_array_0(location);
	IOVEC_SET_STRING(iovec[n++], location);
	}

	if (highlight)
	IOVEC_SET_STRING(iovec[n++], ANSI_HIGHLIGHT_RED_ON);
	IOVEC_SET_STRING(iovec[n++], buffer);
	if (highlight)
	IOVEC_SET_STRING(iovec[n++], ANSI_HIGHLIGHT_OFF);
	IOVEC_SET_STRING(iovec[n++], "\n");

	if (writev(console_fd, iovec, n) < 0) {

	if (errno == EIO && getpid() == 1) {

	/* If somebody tried to kick us from our
	* console tty (via vhangup() or suchlike),
	* try to reconnect */

	log_close_console();
	log_open_console();

	if (console_fd < 0)
	return 0;

	if (writev(console_fd, iovec, n) < 0)
	return -errno;
	} else
	return -errno;
	}

	return 1;
	}

	static int write_to_syslog(
	int level,
	const char*file,
	int line,
	const char *func,
	const char *object_name,
	const char *object,
	const char *buffer) {

	char header_priority[16], header_time[64], header_pid[16];
	struct iovec iovec[5] = {};
	struct msghdr msghdr = {
	.msg_iov = iovec,
	.msg_iovlen = ELEMENTSOF(iovec),
	};
	time_t t;
	struct tm *tm;

	if (syslog_fd < 0)
	return 0;

	snprintf(header_priority, sizeof(header_priority), "<%i>", level);
	char_array_0(header_priority);

	t = (time_t) (now(CLOCK_REALTIME) / USEC_PER_SEC);
	tm = localtime(&t);
	if (!tm)
	return -EINVAL;

	if (strftime(header_time, sizeof(header_time), "%h %e %T ", tm) <= 0)
	return -EINVAL;

	snprintf(header_pid, sizeof(header_pid), "[%lu]: ", (unsigned long) getpid());
	char_array_0(header_pid);

	IOVEC_SET_STRING(iovec[0], header_priority);
	IOVEC_SET_STRING(iovec[1], header_time);
	IOVEC_SET_STRING(iovec[2], program_invocation_short_name);
	IOVEC_SET_STRING(iovec[3], header_pid);
	IOVEC_SET_STRING(iovec[4], buffer);

	/* When using syslog via SOCK_STREAM separate the messages by NUL chars */
	if (syslog_is_stream)
	iovec[4].iov_len++;

	for (;;) {
	ssize_t n;

	n = sendmsg(syslog_fd, &msghdr, MSG_NOSIGNAL);
	if (n < 0)
	return -errno;

	if (!syslog_is_stream \|\|
	(size_t) n >= IOVEC_TOTAL_SIZE(iovec, ELEMENTSOF(iovec)))
	break;

	IOVEC_INCREMENT(iovec, ELEMENTSOF(iovec), n);
	}

	return 1;
	}

	static int write_to_kmsg(
	int level,
	const char*file,
	int line,
	const char *func,
	const char *object_name,
	const char *object,
	const char *buffer) {

	char header_priority[16], header_pid[16];
	struct iovec iovec[5] = {};

	if (kmsg_fd < 0)
	return 0;

	snprintf(header_priority, sizeof(header_priority), "<%i>", level);
	char_array_0(header_priority);

	snprintf(header_pid, sizeof(header_pid), "[%lu]: ", (unsigned long) getpid());
	char_array_0(header_pid);

	IOVEC_SET_STRING(iovec[0], header_priority);
	IOVEC_SET_STRING(iovec[1], program_invocation_short_name);
	IOVEC_SET_STRING(iovec[2], header_pid);
	IOVEC_SET_STRING(iovec[3], buffer);
	IOVEC_SET_STRING(iovec[4], "\n");

	if (writev(kmsg_fd, iovec, ELEMENTSOF(iovec)) < 0)
	return -errno;

	return 1;
	}

	static int log_do_header(char *header, size_t size,
	int level,
	const char file, int line, const char func,
	const char object_name, const char object) {
	snprintf(header, size,
	"PRIORITY=%i\n"
	"SYSLOG_FACILITY=%i\n"
	"%s%.*s%s"
	"%s%.*i%s"
	"%s%.*s%s"
	"%s%.*s%s"
	"SYSLOG_IDENTIFIER=%s\n",
	LOG_PRI(level),
	LOG_FAC(level),
	file ? "CODE_FILE=" : "",
	file ? LINE_MAX : 0, file, /* %.0s means no output */
	file ? "\n" : "",
	line ? "CODE_LINE=" : "",
	line ? 1 : 0, line, /* %.0d means no output too, special case for 0 */
	line ? "\n" : "",
	func ? "CODE_FUNCTION=" : "",
	func ? LINE_MAX : 0, func,
	func ? "\n" : "",
	object ? object_name : "",
	object ? LINE_MAX : 0, object, /* %.0s means no output */
	object ? "\n" : "",
	program_invocation_short_name);
	header[size - 1] = '\0';
	return 0;
	}

	static int write_to_journal(
	int level,
	const char*file,
	int line,
	const char *func,
	const char *object_name,
	const char *object,
	const char *buffer) {

	char header[LINE_MAX];
	struct iovec iovec[4] = {};
	struct msghdr mh = {};

	if (journal_fd < 0)
	return 0;

	log_do_header(header, sizeof(header), level,
	file, line, func, object_name, object);

	IOVEC_SET_STRING(iovec[0], header);
	IOVEC_SET_STRING(iovec[1], "MESSAGE=");
	IOVEC_SET_STRING(iovec[2], buffer);
	IOVEC_SET_STRING(iovec[3], "\n");

	mh.msg_iov = iovec;
	mh.msg_iovlen = ELEMENTSOF(iovec);

	if (sendmsg(journal_fd, &mh, MSG_NOSIGNAL) < 0)
	return -errno;

	return 1;
	}

	static int log_dispatch(
	int level,
	const char*file,
	int line,
	const char *func,
	const char *object_name,
	const char *object,
	char *buffer) {

	int r = 0;

	if (log_target == LOG_TARGET_NULL)
	return 0;

	/* Patch in LOG_DAEMON facility if necessary */
	if ((level & LOG_FACMASK) == 0)
	level = log_facility \| LOG_PRI(level);

	do {
	char *e;
	int k = 0;

	buffer += strspn(buffer, NEWLINE);

	if (buffer[0] == 0)
	break;

	if ((e = strpbrk(buffer, NEWLINE)))
	*(e++) = 0;

	if (log_target == LOG_TARGET_AUTO \|\|
	log_target == LOG_TARGET_JOURNAL_OR_KMSG \|\|
	log_target == LOG_TARGET_JOURNAL) {

	k = write_to_journal(level, file, line, func,
	object_name, object, buffer);
	if (k < 0) {
	if (k != -EAGAIN)
	log_close_journal();
	log_open_kmsg();
	} else if (k > 0)
	r++;
	}

	if (log_target == LOG_TARGET_SYSLOG_OR_KMSG \|\|
	log_target == LOG_TARGET_SYSLOG) {

	k = write_to_syslog(level, file, line, func,
	object_name, object, buffer);
	if (k < 0) {
	if (k != -EAGAIN)
	log_close_syslog();
	log_open_kmsg();
	} else if (k > 0)
	r++;
	}

	if (k <= 0 &&
	(log_target == LOG_TARGET_AUTO \|\|
	log_target == LOG_TARGET_SAFE \|\|
	log_target == LOG_TARGET_SYSLOG_OR_KMSG \|\|
	log_target == LOG_TARGET_JOURNAL_OR_KMSG \|\|
	log_target == LOG_TARGET_KMSG)) {

	k = write_to_kmsg(level, file, line, func,
	object_name, object, buffer);
	if (k < 0) {
	log_close_kmsg();
	log_open_console();
	} else if (k > 0)
	r++;
	}

	if (k <= 0) {
	k = write_to_console(level, file, line, func,
	object_name, object, buffer);
	if (k < 0)
	return k;
	}

	buffer = e;
	} while (buffer);

	return r;
	}

	int log_dump_internal(
	int level,
	const char*file,
	int line,
	const char *func,
	char *buffer) {

	PROTECT_ERRNO;

	/* This modifies the buffer... */

	if (_likely_(LOG_PRI(level) > log_max_level))
	return 0;

	return log_dispatch(level, file, line, func, NULL, NULL, buffer);
	}

	int log_metav(
	int level,
	const char*file,
	int line,
	const char *func,
	const char *format,
	va_list ap) {

	PROTECT_ERRNO;
	char buffer[LINE_MAX];

	if (_likely_(LOG_PRI(level) > log_max_level))
	return 0;

	vsnprintf(buffer, sizeof(buffer), format, ap);
	char_array_0(buffer);

	return log_dispatch(level, file, line, func, NULL, NULL, buffer);
	}

	int log_meta(
	int level,
	const char*file,
	int line,
	const char *func,
	const char *format, ...) {

	int r;
	va_list ap;

	va_start(ap, format);
	r = log_metav(level, file, line, func, format, ap);
	va_end(ap);

	return r;
	}

	int log_metav_object(
	int level,
	const char*file,
	int line,
	const char *func,
	const char *object_name,
	const char *object,
	const char *format,
	va_list ap) {

	PROTECT_ERRNO;
	char buffer[LINE_MAX];

	if (_likely_(LOG_PRI(level) > log_max_level))
	return 0;

	vsnprintf(buffer, sizeof(buffer), format, ap);
	char_array_0(buffer);

	return log_dispatch(level, file, line, func,
	object_name, object, buffer);
	}

	int log_meta_object(
	int level,
	const char*file,
	int line,
	const char *func,
	const char *object_name,
	const char *object,
	const char *format, ...) {

	int r;
	va_list ap;

	va_start(ap, format);
	r = log_metav_object(level, file, line, func,
	object_name, object, format, ap);
	va_end(ap);

	return r;
	}

	static void log_assert(int level, const char text, const char file, int line, const char func, const char format) {
	static char buffer[LINE_MAX];

	if (_likely_(LOG_PRI(level) > log_max_level))
	return;

	DISABLE_WARNING_FORMAT_NONLITERAL;
	snprintf(buffer, sizeof(buffer), format, text, file, line, func);
	REENABLE_WARNING;

	char_array_0(buffer);
	log_abort_msg = buffer;

	log_dispatch(level, file, line, func, NULL, NULL, buffer);
	}

	noreturn void log_assert_failed(const char text, const char file, int line, const char *func) {
	log_assert(LOG_CRIT, text, file, line, func, "Assertion '%s' failed at %s:%u, function %s(). Aborting.");
	abort();
	}

	noreturn void log_assert_failed_unreachable(const char text, const char file, int line, const char *func) {
	log_assert(LOG_CRIT, text, file, line, func, "Code should not be reached '%s' at %s:%u, function %s(). Aborting.");
	abort();
	}

	void log_assert_failed_return(const char text, const char file, int line, const char *func) {
	PROTECT_ERRNO;
	log_assert(LOG_DEBUG, text, file, line, func, "Assertion '%s' failed at %s:%u, function %s(). Ignoring.");
	}

	int log_oom_internal(const char file, int line, const char func) {
	log_meta(LOG_ERR, file, line, func, "Out of memory.");
	return -ENOMEM;
	}

	int log_struct_internal(
	int level,
	const char *file,
	int line,
	const char *func,
	const char *format, ...) {

	PROTECT_ERRNO;
	va_list ap;
	int r;

	if (_likely_(LOG_PRI(level) > log_max_level))
	return 0;

	if (log_target == LOG_TARGET_NULL)
	return 0;

	if ((level & LOG_FACMASK) == 0)
	level = log_facility \| LOG_PRI(level);

	if ((log_target == LOG_TARGET_AUTO \|\|
	log_target == LOG_TARGET_JOURNAL_OR_KMSG \|\|
	log_target == LOG_TARGET_JOURNAL) &&
	journal_fd >= 0) {

	char header[LINE_MAX];
	struct iovec iovec[17] = {};
	unsigned n = 0, i;
	struct msghdr mh = {
	.msg_iov = iovec,
	};
	static const char nl = '\n';

	/* If the journal is available do structured logging */
	log_do_header(header, sizeof(header), level,
	file, line, func, NULL, NULL);
	IOVEC_SET_STRING(iovec[n++], header);

	va_start(ap, format);
	while (format && n + 1 < ELEMENTSOF(iovec)) {
	char *buf;
	va_list aq;

	/* We need to copy the va_list structure,
	* since vasprintf() leaves it afterwards at
	* an undefined location */

	va_copy(aq, ap);
	if (vasprintf(&buf, format, aq) < 0) {
	va_end(aq);
	r = -ENOMEM;
	goto finish;
	}
	va_end(aq);

	/* Now, jump enough ahead, so that we point to
	* the next format string */
	VA_FORMAT_ADVANCE(format, ap);

	IOVEC_SET_STRING(iovec[n++], buf);

	iovec[n].iov_base = (char*) &nl;
	iovec[n].iov_len = 1;
	n++;

	format = va_arg(ap, char *);
	}

	mh.msg_iovlen = n;

	if (sendmsg(journal_fd, &mh, MSG_NOSIGNAL) < 0)
	r = -errno;
	else
	r = 1;

	finish:
	va_end(ap);
	for (i = 1; i < n; i += 2)
	free(iovec[i].iov_base);

	} else {
	char buf[LINE_MAX];
	bool found = false;

	/* Fallback if journal logging is not available */

	va_start(ap, format);
	while (format) {
	va_list aq;

	va_copy(aq, ap);
	vsnprintf(buf, sizeof(buf), format, aq);
	va_end(aq);
	char_array_0(buf);

	if (startswith(buf, "MESSAGE=")) {
	found = true;
	break;
	}

	VA_FORMAT_ADVANCE(format, ap);

	format = va_arg(ap, char *);
	}
	va_end(ap);

	if (found)
	r = log_dispatch(level, file, line, func,
	NULL, NULL, buf + 8);
	else
	r = -EINVAL;
	}

	return r;
	}

	int log_set_target_from_string(const char *e) {
	LogTarget t;

	t = log_target_from_string(e);
	if (t < 0)
	return -EINVAL;

	log_set_target(t);
	return 0;
	}

	int log_set_max_level_from_string(const char *e) {
	int t;

	t = log_level_from_string(e);
	if (t < 0)
	return t;

	log_set_max_level(t);
	return 0;
	}

	void log_parse_environment(void) {
	_cleanup_free_ char *line = NULL;
	const char *e;
	int r;

	r = proc_cmdline(&line);
	if (r < 0)
	log_warning("Failed to read /proc/cmdline. Ignoring: %s", strerror(-r));
	else if (r > 0) {
	char w, state;
	size_t l;

	FOREACH_WORD_QUOTED(w, l, line, state) {
	if (l == 5 && startswith(w, "debug")) {
	log_set_max_level(LOG_DEBUG);
	break;
	}
	}
	}

	e = secure_getenv("SYSTEMD_LOG_TARGET");
	if (e && log_set_target_from_string(e) < 0)
	log_warning("Failed to parse log target %s. Ignoring.", e);

	e = secure_getenv("SYSTEMD_LOG_LEVEL");
	if (e && log_set_max_level_from_string(e) < 0)
	log_warning("Failed to parse log level %s. Ignoring.", e);

	e = secure_getenv("SYSTEMD_LOG_COLOR");
	if (e && log_show_color_from_string(e) < 0)
	log_warning("Failed to parse bool %s. Ignoring.", e);

	e = secure_getenv("SYSTEMD_LOG_LOCATION");
	if (e && log_show_location_from_string(e) < 0)
	log_warning("Failed to parse bool %s. Ignoring.", e);
	}

	LogTarget log_get_target(void) {
	return log_target;
	}

	int log_get_max_level(void) {
	return log_max_level;
	}

	void log_show_color(bool b) {
	show_color = b;
	}

	bool log_get_show_color(void) {
	return show_color;
	}

	void log_show_location(bool b) {
	show_location = b;
	}

	bool log_get_show_location(void) {
	return show_location;
	}

	int log_show_color_from_string(const char *e) {
	int t;

	t = parse_boolean(e);
	if (t < 0)
	return t;

	log_show_color(t);
	return 0;
	}

	int log_show_location_from_string(const char *e) {
	int t;

	t = parse_boolean(e);
	if (t < 0)
	return t;

	log_show_location(t);
	return 0;
	}

	bool log_on_console(void) {
	if (log_target == LOG_TARGET_CONSOLE)
	return true;

	return syslog_fd < 0 && kmsg_fd < 0 && journal_fd < 0;
	}

	static const char *const log_target_table[] = {
	[LOG_TARGET_CONSOLE] = "console",
	[LOG_TARGET_KMSG] = "kmsg",
	[LOG_TARGET_JOURNAL] = "journal",
	[LOG_TARGET_JOURNAL_OR_KMSG] = "journal-or-kmsg",
	[LOG_TARGET_SYSLOG] = "syslog",
	[LOG_TARGET_SYSLOG_OR_KMSG] = "syslog-or-kmsg",
	[LOG_TARGET_AUTO] = "auto",
	[LOG_TARGET_SAFE] = "safe",
	[LOG_TARGET_NULL] = "null"
	};

	DEFINE_STRING_TABLE_LOOKUP(log_target, LogTarget);

	void log_received_signal(int level, const struct signalfd_siginfo *si) {
	if (si->ssi_pid > 0) {
	_cleanup_free_ char *p = NULL;

	get_process_comm(si->ssi_pid, &p);

	log_full(level,
	"Received SIG%s from PID "PID_FMT" (%s).",
	signal_to_string(si->ssi_signo),
	si->ssi_pid, strna(p));
	} else
	log_full(level,
	"Received SIG%s.",
	signal_to_string(si->ssi_signo));

	}