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54f94b1303
Only redefine g_message() and friends to use structured logging if the compiling code is OK with depending on GLib functionality from ≥2.56. Signed-off-by: Philip Withnall <withnall@endlessm.com> Fixes: #1847
637 lines
25 KiB
C
637 lines
25 KiB
C
/* GLIB - Library of useful routines for C programming
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* Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, see <http://www.gnu.org/licenses/>.
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*/
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/*
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* Modified by the GLib Team and others 1997-2000. See the AUTHORS
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* file for a list of people on the GLib Team. See the ChangeLog
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* files for a list of changes. These files are distributed with
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* GLib at ftp://ftp.gtk.org/pub/gtk/.
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*/
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#ifndef __G_MESSAGES_H__
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#define __G_MESSAGES_H__
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#if !defined (__GLIB_H_INSIDE__) && !defined (GLIB_COMPILATION)
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#error "Only <glib.h> can be included directly."
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#endif
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#include <stdarg.h>
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#include <glib/gtypes.h>
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#include <glib/gmacros.h>
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#include <glib/gvariant.h>
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G_BEGIN_DECLS
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/* calculate a string size, guaranteed to fit format + args.
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*/
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GLIB_AVAILABLE_IN_ALL
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gsize g_printf_string_upper_bound (const gchar* format,
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va_list args) G_GNUC_PRINTF(1, 0);
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/* Log level shift offset for user defined
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* log levels (0-7 are used by GLib).
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*/
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#define G_LOG_LEVEL_USER_SHIFT (8)
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/* Glib log levels and flags.
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*/
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typedef enum
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{
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/* log flags */
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G_LOG_FLAG_RECURSION = 1 << 0,
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G_LOG_FLAG_FATAL = 1 << 1,
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/* GLib log levels */
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G_LOG_LEVEL_ERROR = 1 << 2, /* always fatal */
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G_LOG_LEVEL_CRITICAL = 1 << 3,
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G_LOG_LEVEL_WARNING = 1 << 4,
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G_LOG_LEVEL_MESSAGE = 1 << 5,
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G_LOG_LEVEL_INFO = 1 << 6,
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G_LOG_LEVEL_DEBUG = 1 << 7,
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G_LOG_LEVEL_MASK = ~(G_LOG_FLAG_RECURSION | G_LOG_FLAG_FATAL)
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} GLogLevelFlags;
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/* GLib log levels that are considered fatal by default */
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#define G_LOG_FATAL_MASK (G_LOG_FLAG_RECURSION | G_LOG_LEVEL_ERROR)
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typedef void (*GLogFunc) (const gchar *log_domain,
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GLogLevelFlags log_level,
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const gchar *message,
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gpointer user_data);
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/* Logging mechanism
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*/
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GLIB_AVAILABLE_IN_ALL
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guint g_log_set_handler (const gchar *log_domain,
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GLogLevelFlags log_levels,
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GLogFunc log_func,
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gpointer user_data);
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GLIB_AVAILABLE_IN_2_46
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guint g_log_set_handler_full (const gchar *log_domain,
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GLogLevelFlags log_levels,
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GLogFunc log_func,
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gpointer user_data,
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GDestroyNotify destroy);
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GLIB_AVAILABLE_IN_ALL
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void g_log_remove_handler (const gchar *log_domain,
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guint handler_id);
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GLIB_AVAILABLE_IN_ALL
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void g_log_default_handler (const gchar *log_domain,
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GLogLevelFlags log_level,
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const gchar *message,
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gpointer unused_data);
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GLIB_AVAILABLE_IN_ALL
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GLogFunc g_log_set_default_handler (GLogFunc log_func,
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gpointer user_data);
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GLIB_AVAILABLE_IN_ALL
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void g_log (const gchar *log_domain,
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GLogLevelFlags log_level,
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const gchar *format,
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...) G_GNUC_PRINTF (3, 4);
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GLIB_AVAILABLE_IN_ALL
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void g_logv (const gchar *log_domain,
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GLogLevelFlags log_level,
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const gchar *format,
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va_list args) G_GNUC_PRINTF(3, 0);
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GLIB_AVAILABLE_IN_ALL
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GLogLevelFlags g_log_set_fatal_mask (const gchar *log_domain,
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GLogLevelFlags fatal_mask);
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GLIB_AVAILABLE_IN_ALL
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GLogLevelFlags g_log_set_always_fatal (GLogLevelFlags fatal_mask);
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/* Structured logging mechanism. */
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/**
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* GLogWriterOutput:
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* @G_LOG_WRITER_HANDLED: Log writer has handled the log entry.
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* @G_LOG_WRITER_UNHANDLED: Log writer could not handle the log entry.
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*
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* Return values from #GLogWriterFuncs to indicate whether the given log entry
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* was successfully handled by the writer, or whether there was an error in
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* handling it (and hence a fallback writer should be used).
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*
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* If a #GLogWriterFunc ignores a log entry, it should return
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* %G_LOG_WRITER_HANDLED.
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*
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* Since: 2.50
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*/
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typedef enum
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{
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G_LOG_WRITER_HANDLED = 1,
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G_LOG_WRITER_UNHANDLED = 0,
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} GLogWriterOutput;
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/**
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* GLogField:
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* @key: field name (UTF-8 string)
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* @value: field value (arbitrary bytes)
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* @length: length of @value, in bytes, or -1 if it is nul-terminated
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*
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* Structure representing a single field in a structured log entry. See
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* g_log_structured() for details.
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*
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* Log fields may contain arbitrary values, including binary with embedded nul
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* bytes. If the field contains a string, the string must be UTF-8 encoded and
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* have a trailing nul byte. Otherwise, @length must be set to a non-negative
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* value.
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*
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* Since: 2.50
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*/
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typedef struct _GLogField GLogField;
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struct _GLogField
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{
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const gchar *key;
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gconstpointer value;
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gssize length;
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};
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/**
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* GLogWriterFunc:
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* @log_level: log level of the message
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* @fields: (array length=n_fields): fields forming the message
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* @n_fields: number of @fields
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* @user_data: user data passed to g_log_set_writer_func()
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*
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* Writer function for log entries. A log entry is a collection of one or more
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* #GLogFields, using the standard [field names from journal
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* specification](https://www.freedesktop.org/software/systemd/man/systemd.journal-fields.html).
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* See g_log_structured() for more information.
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*
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* Writer functions must ignore fields which they do not recognise, unless they
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* can write arbitrary binary output, as field values may be arbitrary binary.
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*
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* @log_level is guaranteed to be included in @fields as the `PRIORITY` field,
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* but is provided separately for convenience of deciding whether or where to
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* output the log entry.
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*
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* Writer functions should return %G_LOG_WRITER_HANDLED if they handled the log
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* message successfully or if they deliberately ignored it. If there was an
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* error handling the message (for example, if the writer function is meant to
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* send messages to a remote logging server and there is a network error), it
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* should return %G_LOG_WRITER_UNHANDLED. This allows writer functions to be
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* chained and fall back to simpler handlers in case of failure.
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*
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* Returns: %G_LOG_WRITER_HANDLED if the log entry was handled successfully;
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* %G_LOG_WRITER_UNHANDLED otherwise
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* Since: 2.50
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*/
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typedef GLogWriterOutput (*GLogWriterFunc) (GLogLevelFlags log_level,
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const GLogField *fields,
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gsize n_fields,
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gpointer user_data);
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GLIB_AVAILABLE_IN_2_50
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void g_log_structured (const gchar *log_domain,
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GLogLevelFlags log_level,
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...);
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GLIB_AVAILABLE_IN_2_50
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void g_log_structured_array (GLogLevelFlags log_level,
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const GLogField *fields,
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gsize n_fields);
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GLIB_AVAILABLE_IN_2_50
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void g_log_variant (const gchar *log_domain,
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GLogLevelFlags log_level,
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GVariant *fields);
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GLIB_AVAILABLE_IN_2_50
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void g_log_set_writer_func (GLogWriterFunc func,
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gpointer user_data,
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GDestroyNotify user_data_free);
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GLIB_AVAILABLE_IN_2_50
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gboolean g_log_writer_supports_color (gint output_fd);
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GLIB_AVAILABLE_IN_2_50
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gboolean g_log_writer_is_journald (gint output_fd);
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GLIB_AVAILABLE_IN_2_50
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gchar *g_log_writer_format_fields (GLogLevelFlags log_level,
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const GLogField *fields,
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gsize n_fields,
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gboolean use_color);
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GLIB_AVAILABLE_IN_2_50
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GLogWriterOutput g_log_writer_journald (GLogLevelFlags log_level,
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const GLogField *fields,
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gsize n_fields,
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gpointer user_data);
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GLIB_AVAILABLE_IN_2_50
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GLogWriterOutput g_log_writer_standard_streams (GLogLevelFlags log_level,
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const GLogField *fields,
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gsize n_fields,
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gpointer user_data);
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GLIB_AVAILABLE_IN_2_50
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GLogWriterOutput g_log_writer_default (GLogLevelFlags log_level,
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const GLogField *fields,
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gsize n_fields,
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gpointer user_data);
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/**
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* G_DEBUG_HERE:
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*
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* A convenience form of g_log_structured(), recommended to be added to
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* functions when debugging. It prints the current monotonic time and the code
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* location using %G_STRLOC.
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*
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* Since: 2.50
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*/
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#define G_DEBUG_HERE() \
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g_log_structured (G_LOG_DOMAIN, G_LOG_LEVEL_DEBUG, \
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"CODE_FILE", __FILE__, \
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"CODE_LINE", G_STRINGIFY (__LINE__), \
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"CODE_FUNC", G_STRFUNC, \
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"MESSAGE", "%" G_GINT64_FORMAT ": %s", \
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g_get_monotonic_time (), G_STRLOC)
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/* internal */
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void _g_log_fallback_handler (const gchar *log_domain,
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GLogLevelFlags log_level,
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const gchar *message,
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gpointer unused_data);
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/* Internal functions, used to implement the following macros */
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GLIB_AVAILABLE_IN_ALL
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void g_return_if_fail_warning (const char *log_domain,
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const char *pretty_function,
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const char *expression) G_ANALYZER_NORETURN;
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GLIB_AVAILABLE_IN_ALL
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void g_warn_message (const char *domain,
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const char *file,
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int line,
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const char *func,
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const char *warnexpr) G_ANALYZER_NORETURN;
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GLIB_DEPRECATED
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void g_assert_warning (const char *log_domain,
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const char *file,
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const int line,
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const char *pretty_function,
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const char *expression) G_GNUC_NORETURN;
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GLIB_AVAILABLE_IN_2_56
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void g_log_structured_standard (const gchar *log_domain,
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GLogLevelFlags log_level,
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const gchar *file,
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const gchar *line,
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const gchar *func,
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const gchar *message_format,
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...) G_GNUC_PRINTF (6, 7);
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#ifndef G_LOG_DOMAIN
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#define G_LOG_DOMAIN ((gchar*) 0)
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#endif /* G_LOG_DOMAIN */
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#if defined(G_HAVE_ISO_VARARGS) && !G_ANALYZER_ANALYZING
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#if defined(G_LOG_USE_STRUCTURED) && GLIB_VERSION_MAX_ALLOWED >= GLIB_VERSION_2_56
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#define g_error(...) G_STMT_START { \
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g_log_structured_standard (G_LOG_DOMAIN, G_LOG_LEVEL_ERROR, \
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__FILE__, G_STRINGIFY (__LINE__), \
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G_STRFUNC, __VA_ARGS__); \
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for (;;) ; \
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} G_STMT_END
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#define g_message(...) g_log_structured_standard (G_LOG_DOMAIN, G_LOG_LEVEL_MESSAGE, \
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__FILE__, G_STRINGIFY (__LINE__), \
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G_STRFUNC, __VA_ARGS__)
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#define g_critical(...) g_log_structured_standard (G_LOG_DOMAIN, G_LOG_LEVEL_CRITICAL, \
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__FILE__, G_STRINGIFY (__LINE__), \
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G_STRFUNC, __VA_ARGS__)
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#define g_warning(...) g_log_structured_standard (G_LOG_DOMAIN, G_LOG_LEVEL_WARNING, \
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__FILE__, G_STRINGIFY (__LINE__), \
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G_STRFUNC, __VA_ARGS__)
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#define g_info(...) g_log_structured_standard (G_LOG_DOMAIN, G_LOG_LEVEL_INFO, \
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__FILE__, G_STRINGIFY (__LINE__), \
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G_STRFUNC, __VA_ARGS__)
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#define g_debug(...) g_log_structured_standard (G_LOG_DOMAIN, G_LOG_LEVEL_DEBUG, \
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__FILE__, G_STRINGIFY (__LINE__), \
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G_STRFUNC, __VA_ARGS__)
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#else
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/* for(;;) ; so that GCC knows that control doesn't go past g_error().
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* Put space before ending semicolon to avoid C++ build warnings.
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*/
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#define g_error(...) G_STMT_START { \
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g_log (G_LOG_DOMAIN, \
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G_LOG_LEVEL_ERROR, \
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__VA_ARGS__); \
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for (;;) ; \
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} G_STMT_END
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#define g_message(...) g_log (G_LOG_DOMAIN, \
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G_LOG_LEVEL_MESSAGE, \
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__VA_ARGS__)
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#define g_critical(...) g_log (G_LOG_DOMAIN, \
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G_LOG_LEVEL_CRITICAL, \
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__VA_ARGS__)
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#define g_warning(...) g_log (G_LOG_DOMAIN, \
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G_LOG_LEVEL_WARNING, \
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__VA_ARGS__)
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#define g_info(...) g_log (G_LOG_DOMAIN, \
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G_LOG_LEVEL_INFO, \
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__VA_ARGS__)
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#define g_debug(...) g_log (G_LOG_DOMAIN, \
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G_LOG_LEVEL_DEBUG, \
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__VA_ARGS__)
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#endif
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#elif defined(G_HAVE_GNUC_VARARGS) && !G_ANALYZER_ANALYZING
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#if defined(G_LOG_USE_STRUCTURED) && GLIB_VERSION_MAX_ALLOWED >= GLIB_VERSION_2_56
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#define g_error(format...) G_STMT_START { \
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g_log_structured_standard (G_LOG_DOMAIN, G_LOG_LEVEL_ERROR, \
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__FILE__, G_STRINGIFY (__LINE__), \
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G_STRFUNC, format); \
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for (;;) ; \
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} G_STMT_END
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#define g_message(format...) g_log_structured_standard (G_LOG_DOMAIN, G_LOG_LEVEL_MESSAGE, \
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__FILE__, G_STRINGIFY (__LINE__), \
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G_STRFUNC, format)
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#define g_critical(format...) g_log_structured_standard (G_LOG_DOMAIN, G_LOG_LEVEL_CRITICAL, \
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__FILE__, G_STRINGIFY (__LINE__), \
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G_STRFUNC, format)
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#define g_warning(format...) g_log_structured_standard (G_LOG_DOMAIN, G_LOG_LEVEL_WARNING, \
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__FILE__, G_STRINGIFY (__LINE__), \
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G_STRFUNC, format)
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#define g_info(format...) g_log_structured_standard (G_LOG_DOMAIN, G_LOG_LEVEL_INFO, \
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__FILE__, G_STRINGIFY (__LINE__), \
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G_STRFUNC, format)
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#define g_debug(format...) g_log_structured_standard (G_LOG_DOMAIN, G_LOG_LEVEL_DEBUG, \
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__FILE__, G_STRINGIFY (__LINE__), \
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G_STRFUNC, format)
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#else
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#define g_error(format...) G_STMT_START { \
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g_log (G_LOG_DOMAIN, \
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G_LOG_LEVEL_ERROR, \
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format); \
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for (;;) ; \
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} G_STMT_END
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#define g_message(format...) g_log (G_LOG_DOMAIN, \
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G_LOG_LEVEL_MESSAGE, \
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format)
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#define g_critical(format...) g_log (G_LOG_DOMAIN, \
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G_LOG_LEVEL_CRITICAL, \
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format)
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#define g_warning(format...) g_log (G_LOG_DOMAIN, \
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G_LOG_LEVEL_WARNING, \
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format)
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#define g_info(format...) g_log (G_LOG_DOMAIN, \
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G_LOG_LEVEL_INFO, \
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format)
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#define g_debug(format...) g_log (G_LOG_DOMAIN, \
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G_LOG_LEVEL_DEBUG, \
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format)
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#endif
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#else /* no varargs macros */
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static void g_error (const gchar *format, ...) G_GNUC_NORETURN G_ANALYZER_NORETURN;
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static void g_critical (const gchar *format, ...) G_ANALYZER_NORETURN;
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static inline void
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g_error (const gchar *format,
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...)
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{
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va_list args;
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va_start (args, format);
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g_logv (G_LOG_DOMAIN, G_LOG_LEVEL_ERROR, format, args);
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va_end (args);
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for(;;) ;
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}
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static inline void
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g_message (const gchar *format,
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...)
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{
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va_list args;
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va_start (args, format);
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g_logv (G_LOG_DOMAIN, G_LOG_LEVEL_MESSAGE, format, args);
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va_end (args);
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}
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static inline void
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g_critical (const gchar *format,
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...)
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{
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va_list args;
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va_start (args, format);
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g_logv (G_LOG_DOMAIN, G_LOG_LEVEL_CRITICAL, format, args);
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va_end (args);
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}
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static inline void
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g_warning (const gchar *format,
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...)
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{
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va_list args;
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va_start (args, format);
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g_logv (G_LOG_DOMAIN, G_LOG_LEVEL_WARNING, format, args);
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va_end (args);
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}
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static inline void
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g_info (const gchar *format,
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...)
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{
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va_list args;
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va_start (args, format);
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g_logv (G_LOG_DOMAIN, G_LOG_LEVEL_INFO, format, args);
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va_end (args);
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}
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static inline void
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g_debug (const gchar *format,
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...)
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{
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va_list args;
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va_start (args, format);
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g_logv (G_LOG_DOMAIN, G_LOG_LEVEL_DEBUG, format, args);
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va_end (args);
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}
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#endif /* !__GNUC__ */
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/**
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* GPrintFunc:
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* @string: the message to output
|
|
*
|
|
* Specifies the type of the print handler functions.
|
|
* These are called with the complete formatted string to output.
|
|
*/
|
|
typedef void (*GPrintFunc) (const gchar *string);
|
|
GLIB_AVAILABLE_IN_ALL
|
|
void g_print (const gchar *format,
|
|
...) G_GNUC_PRINTF (1, 2);
|
|
GLIB_AVAILABLE_IN_ALL
|
|
GPrintFunc g_set_print_handler (GPrintFunc func);
|
|
GLIB_AVAILABLE_IN_ALL
|
|
void g_printerr (const gchar *format,
|
|
...) G_GNUC_PRINTF (1, 2);
|
|
GLIB_AVAILABLE_IN_ALL
|
|
GPrintFunc g_set_printerr_handler (GPrintFunc func);
|
|
|
|
/**
|
|
* g_warn_if_reached:
|
|
*
|
|
* Logs a warning.
|
|
*
|
|
* Since: 2.16
|
|
*/
|
|
#define g_warn_if_reached() \
|
|
do { \
|
|
g_warn_message (G_LOG_DOMAIN, __FILE__, __LINE__, G_STRFUNC, NULL); \
|
|
} while (0)
|
|
|
|
/**
|
|
* g_warn_if_fail:
|
|
* @expr: the expression to check
|
|
*
|
|
* Logs a warning if the expression is not true.
|
|
*
|
|
* Since: 2.16
|
|
*/
|
|
#define g_warn_if_fail(expr) \
|
|
do { \
|
|
if G_LIKELY (expr) ; \
|
|
else g_warn_message (G_LOG_DOMAIN, __FILE__, __LINE__, G_STRFUNC, #expr); \
|
|
} while (0)
|
|
|
|
#ifdef G_DISABLE_CHECKS
|
|
|
|
/**
|
|
* g_return_if_fail:
|
|
* @expr: the expression to check
|
|
*
|
|
* Verifies that the expression @expr, usually representing a precondition,
|
|
* evaluates to %TRUE. If the function returns a value, use
|
|
* g_return_val_if_fail() instead.
|
|
*
|
|
* If @expr evaluates to %FALSE, the current function should be considered to
|
|
* have undefined behaviour (a programmer error). The only correct solution
|
|
* to such an error is to change the module that is calling the current
|
|
* function, so that it avoids this incorrect call.
|
|
*
|
|
* To make this undefined behaviour visible, if @expr evaluates to %FALSE,
|
|
* the result is usually that a critical message is logged and the current
|
|
* function returns.
|
|
*
|
|
* If `G_DISABLE_CHECKS` is defined then the check is not performed. You
|
|
* should therefore not depend on any side effects of @expr.
|
|
*
|
|
* To debug failure of a g_return_if_fail() check, run the code under a debugger
|
|
* with `G_DEBUG=fatal-criticals` or `G_DEBUG=fatal-warnings` defined in the
|
|
* environment (see [Running GLib Applications](glib-running.html)):
|
|
*
|
|
* |[
|
|
* G_DEBUG=fatal-warnings gdb ./my-program
|
|
* ]|
|
|
*
|
|
* Any unrelated failures can be skipped over in
|
|
* [gdb](https://www.gnu.org/software/gdb/) using the `continue` command.
|
|
*/
|
|
#define g_return_if_fail(expr) G_STMT_START{ (void)0; }G_STMT_END
|
|
|
|
/**
|
|
* g_return_val_if_fail:
|
|
* @expr: the expression to check
|
|
* @val: the value to return from the current function
|
|
* if the expression is not true
|
|
*
|
|
* Verifies that the expression @expr, usually representing a precondition,
|
|
* evaluates to %TRUE. If the function does not return a value, use
|
|
* g_return_if_fail() instead.
|
|
*
|
|
* If @expr evaluates to %FALSE, the current function should be considered to
|
|
* have undefined behaviour (a programmer error). The only correct solution
|
|
* to such an error is to change the module that is calling the current
|
|
* function, so that it avoids this incorrect call.
|
|
*
|
|
* To make this undefined behaviour visible, if @expr evaluates to %FALSE,
|
|
* the result is usually that a critical message is logged and @val is
|
|
* returned from the current function.
|
|
*
|
|
* If `G_DISABLE_CHECKS` is defined then the check is not performed. You
|
|
* should therefore not depend on any side effects of @expr.
|
|
*
|
|
* See g_return_if_fail() for guidance on how to debug failure of this check.
|
|
*/
|
|
#define g_return_val_if_fail(expr,val) G_STMT_START{ (void)0; }G_STMT_END
|
|
|
|
/**
|
|
* g_return_if_reached:
|
|
*
|
|
* Logs a critical message and returns from the current function.
|
|
* This can only be used in functions which do not return a value.
|
|
*
|
|
* See g_return_if_fail() for guidance on how to debug failure of this check.
|
|
*/
|
|
#define g_return_if_reached() G_STMT_START{ return; }G_STMT_END
|
|
|
|
/**
|
|
* g_return_val_if_reached:
|
|
* @val: the value to return from the current function
|
|
*
|
|
* Logs a critical message and returns @val.
|
|
*
|
|
* See g_return_if_fail() for guidance on how to debug failure of this check.
|
|
*/
|
|
#define g_return_val_if_reached(val) G_STMT_START{ return (val); }G_STMT_END
|
|
|
|
#else /* !G_DISABLE_CHECKS */
|
|
|
|
#define g_return_if_fail(expr) \
|
|
G_STMT_START { \
|
|
if (G_LIKELY (expr)) \
|
|
{ } \
|
|
else \
|
|
{ \
|
|
g_return_if_fail_warning (G_LOG_DOMAIN, \
|
|
G_STRFUNC, \
|
|
#expr); \
|
|
return; \
|
|
} \
|
|
} G_STMT_END
|
|
|
|
#define g_return_val_if_fail(expr, val) \
|
|
G_STMT_START { \
|
|
if (G_LIKELY (expr)) \
|
|
{ } \
|
|
else \
|
|
{ \
|
|
g_return_if_fail_warning (G_LOG_DOMAIN, \
|
|
G_STRFUNC, \
|
|
#expr); \
|
|
return (val); \
|
|
} \
|
|
} G_STMT_END
|
|
|
|
#define g_return_if_reached() \
|
|
G_STMT_START { \
|
|
g_log (G_LOG_DOMAIN, \
|
|
G_LOG_LEVEL_CRITICAL, \
|
|
"file %s: line %d (%s): should not be reached", \
|
|
__FILE__, \
|
|
__LINE__, \
|
|
G_STRFUNC); \
|
|
return; \
|
|
} G_STMT_END
|
|
|
|
#define g_return_val_if_reached(val) \
|
|
G_STMT_START { \
|
|
g_log (G_LOG_DOMAIN, \
|
|
G_LOG_LEVEL_CRITICAL, \
|
|
"file %s: line %d (%s): should not be reached", \
|
|
__FILE__, \
|
|
__LINE__, \
|
|
G_STRFUNC); \
|
|
return (val); \
|
|
} G_STMT_END
|
|
|
|
#endif /* !G_DISABLE_CHECKS */
|
|
|
|
G_END_DECLS
|
|
|
|
#endif /* __G_MESSAGES_H__ */
|