+#include "util.h"
+#include "macro.h"
+
+#define SYSLOG_TIMEOUT_USEC (5*USEC_PER_SEC)
+#define LOG_BUFFER_MAX 1024
+
+static LogTarget log_target = LOG_TARGET_CONSOLE;
+static int log_max_level = LOG_DEBUG;
+
+static int console_fd = STDERR_FILENO;
+static int syslog_fd = -1;
+static int kmsg_fd = -1;
+
+/* Akin to glibc's __abort_msg; which is private and we hance cannot
+ * use here. */
+static char *log_abort_msg = NULL;
+
+void log_close_console(void) {
+
+ if (console_fd < 0)
+ return;
+
+ if (getpid() == 1 || console_fd != STDERR_FILENO) {
+ close_nointr_nofail(console_fd);
+ console_fd = -1;
+ }
+}
+
+static int log_open_console(void) {
+
+ if (console_fd >= 0)
+ return 0;
+
+ if (getpid() == 1) {
+
+ if ((console_fd = open_terminal("/dev/console", O_WRONLY|O_NOCTTY|O_CLOEXEC)) < 0) {
+ log_error("Failed to open /dev/console for logging: %s", strerror(-console_fd));
+ return console_fd;
+ }
+
+ log_info("Succesfully opened /dev/console for logging.");
+ } 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;
+
+ if ((kmsg_fd = open("/dev/kmsg", O_WRONLY|O_NOCTTY|O_CLOEXEC)) < 0) {
+ log_info("Failed to open /dev/kmsg for logging: %s", strerror(errno));
+ return -errno;
+ }
+
+ log_info("Succesfully opened /dev/kmsg for logging.");
+
+ return 0;
+}
+
+void log_close_syslog(void) {
+
+ if (syslog_fd < 0)
+ return;
+
+ close_nointr_nofail(syslog_fd);
+ syslog_fd = -1;
+}
+
+static int log_open_syslog(void) {
+ union {
+ struct sockaddr sa;
+ struct sockaddr_un un;
+ } sa;
+ struct timeval tv;
+ int r;
+
+ if (syslog_fd >= 0)
+ return 0;
+
+ if ((syslog_fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0)) < 0) {
+ r = -errno;
+ goto fail;
+ }
+
+ /* Make sure we don't block for more than 5s when talking to
+ * syslog */
+ timeval_store(&tv, SYSLOG_TIMEOUT_USEC);
+ if (setsockopt(syslog_fd, SOL_SOCKET, SO_SNDTIMEO, &tv, sizeof(tv)) < 0) {
+ r = -errno;
+ goto fail;
+ }
+
+ zero(sa);
+ sa.un.sun_family = AF_UNIX;
+ strncpy(sa.un.sun_path, "/dev/log", sizeof(sa.un.sun_path));
+
+ if (connect(syslog_fd, &sa.sa, sizeof(sa)) < 0) {
+ r = -errno;
+ goto fail;
+ }
+
+ log_info("Succesfully opened syslog for logging.");
+
+ return 0;
+
+fail:
+ log_close_syslog();
+ log_info("Failed to open syslog for logging: %s", strerror(-r));
+ 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_SYSLOG_OR_KMSG ||
+ log_target == LOG_TARGET_SYSLOG)
+ if ((r = log_open_syslog()) >= 0) {
+ log_close_console();
+ return r;
+ }
+
+ if (log_target == LOG_TARGET_SYSLOG_OR_KMSG ||
+ log_target == LOG_TARGET_KMSG)
+ if ((r = log_open_kmsg()) >= 0) {
+ log_close_syslog();
+ log_close_console();
+ return r;
+ }
+
+ 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_set_max_level(int level) {
+ assert((level & LOG_PRIMASK) == level);
+
+ log_max_level = level;
+}
+
+static int write_to_console(
+ int level,
+ const char*file,
+ int line,
+ const char *func,
+ const char *buffer) {
+
+ char location[64];
+ struct iovec iovec[5];
+ unsigned n = 0;
+ bool highlight;
+
+ if (console_fd < 0)
+ return 0;
+
+ snprintf(location, sizeof(location), "(%s:%u) ", file, line);
+ char_array_0(location);
+
+ highlight = LOG_PRI(level) <= LOG_ERR;
+
+ zero(iovec);
+ IOVEC_SET_STRING(iovec[n++], location);
+ if (highlight)
+ IOVEC_SET_STRING(iovec[n++], "\x1B[1;31m");
+ IOVEC_SET_STRING(iovec[n++], buffer);
+ if (highlight)
+ IOVEC_SET_STRING(iovec[n++], "\x1B[0m");
+ IOVEC_SET_STRING(iovec[n++], "\n");
+
+ if (writev(console_fd, iovec, n) < 0)
+ return -errno;
+
+ return 1;
+}
+
+static int write_to_syslog(
+ int level,
+ const char*file,
+ int line,
+ const char *func,
+ const char *buffer) {