--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/shared/log.h	Sun Dec 27 22:01:17 2009 +0200
@@ -0,0 +1,112 @@
+#ifndef SHARED_LOG_H
+#define SHARED_LOG_H
+
+#include <stdarg.h>
+
+/**
+ * Log level definitions
+ *
+ * XXX: these names conflict with <syslog.h>
+ */
+enum log_level {
+    LOG_DEBUG,
+    LOG_INFO,
+    LOG_WARN,
+    LOG_ERROR,
+    LOG_FATAL,
+};
+
+/**
+ * List of log_level values as strings, NULL-terminated
+ */
+extern const char *log_level_names[];
+
+/**
+ * The default log level
+ */
+#define LOG_LEVEL_DEFAULT LOG_INFO
+
+/**
+ * Maximum length of a log message, including terminating NUL
+ */
+#define LOG_MSG_MAX 1024
+
+/**
+ * Set the current log level to filter out messages below the given level
+ */
+void set_log_level (enum log_level level);
+/**
+ * Internal logging func, meant for using custom level tags. This performs the filtering of log levels.
+ *
+ * Format the full output line, and pass it to the log_output_func. The line will be of the form:
+ *  "[<tag>] <func> : <user_fmt> [ <log_fmt> ]"
+ */
+void log_output_tag (enum log_level level, const char *tag, const char *func, const char *user_fmt, va_list user_fmtargs, const char *log_fmt, ...)
+    __attribute__ ((format (printf, 6, 7)));
+
+/**
+ * va_list version of log_output_tag
+ */
+void log_output_tag_va (enum log_level level, const char *tag, const char *func, const char *user_fmt, va_list user_fmtargs, const char *log_fmt, va_list log_fmtargs);
+
+/**
+ * Log a message with the given level
+ */
+#define log_msg(level, ...) _log_msg(level, __func__, __VA_ARGS__)
+void _log_msg (enum log_level level, const char *func, const char *format, ...)
+    __attribute__ ((format (printf, 3, 4)));
+
+/**
+ * Log a message with the given level with the given format and varargs
+ */
+#define log_msg_va2(level, fmt1, vargs1, fmt2, vargs2) _log_msg_va(level, __func__, fmt1, vargs1, fmt2, vargs2)
+void _log_msg_va2 (enum log_level level, const char *func, const char *fmt1, va_list fmtargs1, const char *fmt2, va_list fmtargs2);
+
+
+/**
+ * Shorthand for log_msg
+ */
+#define log_debug(...) log_msg(LOG_DEBUG, __VA_ARGS__)
+#define log_info(...)  log_msg(LOG_INFO,  __VA_ARGS__)
+#define log_warn(...)  log_msg(LOG_WARN,  __VA_ARGS__)
+#define log_error(...) log_msg(LOG_ERROR, __VA_ARGS__)
+#define log_fatal(...) log_msg(LOG_FATAL, __VA_ARGS__)
+
+/**
+ * Log using errno.
+ */
+#define log_errno(...) _log_errno(LOG_ERROR, __func__, __VA_ARGS__)
+#define log_warn_errno(...) _log_errno(LOG_WARN, __func__, __VA_ARGS__)
+void _log_errno (enum log_level level, const char *func, const char *format, ...)
+    __attribute__ ((format (printf, 3, 4)));
+
+/**
+ * Log with an [EXIT] tag at given level, and then exit with given exit code
+ */
+#define log_exit(level, exit_code, ...) _log_exit(level, exit_code, __func__, __VA_ARGS__)
+void _log_exit (enum log_level level, int exit_code, const char *func, const char *format, ...)
+    __attribute__ ((format (printf, 4, 5)))
+    __attribute__ ((noreturn));
+
+// for abort()
+#include <stdlib.h>
+
+/**
+ * log_fatal + exit failure
+ */
+#define FATAL(...) do { log_fatal(__VA_ARGS__); abort(); } while (0)
+
+/**
+ * log_perr + exit failure
+ */
+#define FATAL_ERRNO(...) do { _log_errno(LOG_FATAL, __func__, __VA_ARGS__); abort(); } while (0)
+
+/**
+ * Exit with given code, also logging a message at LOG_... with an [EXIT] tag
+ */
+#define EXIT_INFO(exit_code, ...)  log_exit(LOG_INFO,  exit_code, __VA_ARGS__)
+#define EXIT_WARN(exit_code, ...)  log_exit(LOG_WARN,  exit_code, __VA_ARGS__)
+#define EXIT_ERROR(exit_code, ...) log_exit(LOG_ERROR, exit_code, __VA_ARGS__)
+#define EXIT_FATAL(exit_code, ...) log_exit(LOG_FATAL, exit_code, __VA_ARGS__)
+
+#endif /* LOG_H */