Support functions to allow libraries to provide errors to their callers. More...

#include <freeradius-devel/util/dlist.h>
#include <freeradius-devel/util/strerror.h>
#include <freeradius-devel/util/atexit.h>

Include dependency graph for strerror.c:

Go to the source code of this file.

Data Structures
struct	fr_log_buffer_t
	Holds data used by the logging stack. More...

struct	fr_log_entry_s

Macros
#define	FR_STRERROR_BUFSIZE (2048)

Typedefs
typedef struct fr_log_entry_s	fr_log_entry_t

Functions
static int	_fr_logging_free (void *arg)

void	_fr_strerror_const (char const file, int line, char const msg)
	Log to thread local error buffer.

void	_fr_strerror_const_push (char const file, int line, char const msg)
	Add a message to an existing stack of messages at the tail.

void	_fr_strerror_const_push_head (char const file, int line, char const msg)
	Add a message to an existing stack of messages at the head.

void	_fr_strerror_marker_vprintf (char const file, int line, char const subject, size_t offset, char const *fmt, va_list ap)
	Add an error marker to an existing stack of messages.

void	_fr_strerror_marker_vprintf_push (char const file, int line, char const subject, size_t offset, char const *fmt, va_list ap)
	Add an error marker to an existing stack of messages at the tail.

void	_fr_strerror_marker_vprintf_push_head (char const file, int line, char const subject, size_t offset, char const *fmt, va_list ap)
	Add an error marker to an existing stack of messages at the head.

void	_fr_strerror_vprintf (char const file, int line, char const fmt, va_list ap)
	Log to thread local error buffer.

void	_fr_strerror_vprintf_push (char const file, int line, char const fmt, va_list ap)
	Add a message to an existing stack of messages at the tail.

void	_fr_strerror_vprintf_push_head (char const file, int line, char const fmt, va_list ap)
	Add a message to an existing stack of messages at the head.

void	fr_perror (char const *fmt,...)
	Print the current error to stderr with a prefix.

char const *	fr_perror_to_str (char const line_sep, char const fmt,...)
	Print the stack of string buffers to a thread local buffer.

char const *	fr_strerror (void)
	Get the last library error.

void	fr_strerror_clear (void)
	Clears all pending messages from the talloc pools.

static fr_log_buffer_t *	fr_strerror_init (void)
	Initialise thread local storage.

char const *	fr_strerror_marker (char const *subject, size_t offset)
	Get the last library error marker.

char const *	fr_strerror_marker_peek (char const *subject, size_t offset)
	Get the last library error marker.

char const *	fr_strerror_marker_pop (char const *subject, size_t offset)
	Pop the last library error with marker information.

char const *	fr_strerror_peek (void)
	Get the last library error.

char const *	fr_strerror_pop (void)
	Pop the last library error.

static TALLOC_CTX *	pool_alt (fr_log_buffer_t *buffer)

static void	pool_alt_free_children (fr_log_buffer_t *buffer)

static fr_log_entry_t *	strerror_const (char const file, int line, char const msg)
	Create an entry in the thread local logging stack using a const string, clearing all other entries.

static fr_log_entry_t *	strerror_const_push (char const file, int line, fr_log_buffer_t buffer, char const *msg)
	Add a message to an existing stack of messages.

static fr_log_entry_t *	strerror_vprintf (char const file, int line, char const fmt, va_list ap)
	Create an entry in the thread local logging stack, clearing all other entries.

static fr_log_entry_t *	strerror_vprintf_push (char const file, int line, fr_log_buffer_t buffer, char const *fmt, va_list ap)
	Add a message to an existing stack of messages.

Variables
static _Thread_local fr_log_buffer_t *	fr_strerror_buffer

static _Thread_local bool	logging_stop
	Due to ordering issues we may get errors being logged from within other thread local destructors which cause a crash on exit if the logging buffer has already been freed.

Detailed Description

Support functions to allow libraries to provide errors to their callers.

Copyright: 2017-2020 The FreeRADIUS server project; 2017-2020 Arran Cudbard-Bell (a.cud.nosp@m.bard.nosp@m.b@fre.nosp@m.erad.nosp@m.ius.o.nosp@m.rg)

Definition in file strerror.c.

Data Structure Documentation

◆ fr_log_buffer_t

struct fr_log_buffer_t

Holds data used by the logging stack.

pool_a and pool_b allow fr_strerror and fr_strerror_pop during a call to fr_strerror_printf or fr_strerror_printf_push.

Definition at line 50 of file strerror.c.

Collaboration diagram for fr_log_buffer_t:

Data Fields
fr_dlist_head_t	entries
TALLOC_CTX *	pool	Current pool in use.
TALLOC_CTX *	pool_a	Pool to avoid memory allocations.
TALLOC_CTX *	pool_b	Pool to avoid memory allocations.

◆ fr_log_entry_s

struct fr_log_entry_s

Definition at line 34 of file strerror.c.

Collaboration diagram for fr_log_entry_s:

Data Fields
char const *	file	File where the error was created.
int	line	Line where the error occurred.
fr_dlist_t	list
char const *	msg	Log message.
size_t	offset	Where to place the msg marker relative to the subject.
char const *	subject	Subject for error markers.

Macro Definition Documentation

◆ FR_STRERROR_BUFSIZE

#define FR_STRERROR_BUFSIZE (2048)

Definition at line 31 of file strerror.c.

Typedef Documentation

◆ fr_log_entry_t

typedef struct fr_log_entry_s fr_log_entry_t

Definition at line 33 of file strerror.c.

Function Documentation

◆ _fr_logging_free()

static int _fr_logging_free ( void * arg )

static

Definition at line 68 of file strerror.c.

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◆ _fr_strerror_const()

void _fr_strerror_const	(	char const *	file,
		int	line,
		char const *	msg
	)

Log to thread local error buffer.

Parameters

[in]	file	the error occurred in.
[in]	line	the error occurred on.
[in]	msg	To add to error stack. Must have a lifetime equal to that of the program.

Definition at line 449 of file strerror.c.

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◆ _fr_strerror_const_push()

void _fr_strerror_const_push	(	char const *	file,
		int	line,
		char const *	msg
	)

Add a message to an existing stack of messages at the tail.

Parameters

[in]	file	the error occurred in.
[in]	line	the error occurred on.
[in]	msg	To add to error stack. Must have a lifetime equal to that of the program.

Definition at line 507 of file strerror.c.

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◆ _fr_strerror_const_push_head()

void _fr_strerror_const_push_head	(	char const *	file,
		int	line,
		char const *	msg
	)

Add a message to an existing stack of messages at the head.

Parameters

[in]	file	the error occurred in.
[in]	line	the error occurred on.
[in]	msg	To add to error stack. Must have a lifetime equal to that of the program.

Definition at line 530 of file strerror.c.

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◆ _fr_strerror_marker_vprintf()

void _fr_strerror_marker_vprintf	(	char const *	file,
		int	line,
		char const *	subject,
		size_t	offset,
		char const *	fmt,
		va_list	ap
	)

Add an error marker to an existing stack of messages.

Parameters

[in]	file	the error occurred in.
[in]	line	the error occurred on.
[in]	subject	to mark up.
[in]	offset	Positive offset to show where the error should be positioned.
[in]	fmt	Error string.
[in]	ap	Arguments for the error string.

Definition at line 319 of file strerror.c.

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◆ _fr_strerror_marker_vprintf_push()

void _fr_strerror_marker_vprintf_push	(	char const *	file,
		int	line,
		char const *	subject,
		size_t	offset,
		char const *	fmt,
		va_list	ap
	)

Add an error marker to an existing stack of messages at the tail.

Parameters

[in]	file	the error occurred in.
[in]	line	the error occurred on.
[in]	subject	to mark up.
[in]	offset	Positive offset to show where the error should be positioned.
[in]	fmt	Error string.
[in]	ap	Arguments for the error string.

Definition at line 347 of file strerror.c.

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◆ _fr_strerror_marker_vprintf_push_head()

void _fr_strerror_marker_vprintf_push_head	(	char const *	file,
		int	line,
		char const *	subject,
		size_t	offset,
		char const *	fmt,
		va_list	ap
	)

Add an error marker to an existing stack of messages at the head.

Parameters

[in]	file	the error occurred in.
[in]	line	the error occurred on.
[in]	subject	to mark up.
[in]	offset	Positive offset to show where the error should be positioned.
[in]	fmt	Error string.
[in]	ap	Arguments for the error string.

Definition at line 381 of file strerror.c.

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◆ _fr_strerror_vprintf()

void _fr_strerror_vprintf	(	char const *	file,
		int	line,
		char const *	fmt,
		va_list	ap
	)

Log to thread local error buffer.

Parameters

[in]	file	the error occurred in.
[in]	line	the error occurred on.
[in]	fmt	printf style format string. If NULL clears any existing messages.
[in]	ap	Arguments for the format string.

Definition at line 244 of file strerror.c.

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◆ _fr_strerror_vprintf_push()

void _fr_strerror_vprintf_push	(	char const *	file,
		int	line,
		char const *	fmt,
		va_list	ap
	)

Add a message to an existing stack of messages at the tail.

Parameters

[in]	file	the error occurred in.
[in]	line	the error occurred on.
[in]	fmt	printf style format string.
[in]	ap	Arguments for the format string.

Definition at line 262 of file strerror.c.

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◆ _fr_strerror_vprintf_push_head()

void _fr_strerror_vprintf_push_head	(	char const *	file,
		int	line,
		char const *	fmt,
		va_list	ap
	)

Add a message to an existing stack of messages at the head.

Parameters

[in]	file	the error occurred in.
[in]	line	the error occurred on.
[in]	fmt	printf style format string.
[in]	ap	Arguments for the format string.

Definition at line 289 of file strerror.c.

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◆ fr_perror()

void fr_perror	(	char const *	fmt,
			...
	)

Print the current error to stderr with a prefix.

Used by utility functions lacking their own logging infrastructure

Definition at line 732 of file strerror.c.

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◆ fr_perror_to_str()

char const * fr_perror_to_str	(	char const *	line_sep,
		char const *	fmt,
			...
	)

Print the stack of string buffers to a thread local buffer.

Used by utility functions lacking their own logging infrastructure

Parameters

[in]	line_sep	to insert between the log lines.
[in]	fmt	to prefix all log messages with.

Returns

A thread local string buffer containing the concatenated messages.

Definition at line 778 of file strerror.c.

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◆ fr_strerror()

char const * fr_strerror ( void )

Get the last library error.

Will only return the last library error once, after which it will return a zero length string. If there are additional messages on the log stack they will be discarded.

Returns: library error or zero length string.

Definition at line 553 of file strerror.c.

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◆ fr_strerror_clear()

void fr_strerror_clear ( void )

Clears all pending messages from the talloc pools.

Definition at line 576 of file strerror.c.

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◆ fr_strerror_init()

static fr_log_buffer_t * fr_strerror_init ( void )

static

Initialise thread local storage.

Returns: fr_buffer_t containing log messages.

Definition at line 87 of file strerror.c.

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◆ fr_strerror_marker()

char const * fr_strerror_marker	(	char const **	subject,
		size_t *	offset
	)

Get the last library error marker.

Parameters

[out]	subject	The subject string the error relates to.
[out]	offset	Where to place the marker.

Returns

NULL if there are no pending errors.
The error message if there was an error.

Definition at line 597 of file strerror.c.

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◆ fr_strerror_marker_peek()

char const * fr_strerror_marker_peek	(	char const **	subject,
		size_t *	offset
	)

Get the last library error marker.

Parameters

[out]	subject	The subject string the error relates to.
[out]	offset	Where to place the marker.

Returns

NULL if there are no pending errors.
The error message if there was an error.

Definition at line 650 of file strerror.c.

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◆ fr_strerror_marker_pop()

char const * fr_strerror_marker_pop	(	char const **	subject,
		size_t *	offset
	)

Pop the last library error with marker information.

Return the first message added to the error stack using fr_strerror_printf or fr_strerror_printf_push.

Returns

A library error.
NULL if no errors are pending.

Definition at line 707 of file strerror.c.

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◆ fr_strerror_peek()

char const * fr_strerror_peek ( void )

Get the last library error.

Returns: library error or zero length string.

Definition at line 626 of file strerror.c.

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◆ fr_strerror_pop()

char const * fr_strerror_pop ( void )

Pop the last library error.

Return the first message added to the error stack using fr_strerror_printf or fr_strerror_printf_push.

Note: fr_strerror() will return NULL if no messages are pending.

Returns

A library error.
NULL if no errors are pending.

Definition at line 680 of file strerror.c.

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◆ pool_alt()

static TALLOC_CTX * pool_alt ( fr_log_buffer_t * buffer )

inlinestatic

Definition at line 124 of file strerror.c.

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◆ pool_alt_free_children()

static void pool_alt_free_children ( fr_log_buffer_t * buffer )

inlinestatic

Definition at line 133 of file strerror.c.

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◆ strerror_const()

static fr_log_entry_t * strerror_const	(	char const *	file,
		int	line,
		char const *	msg
	)

inlinestatic

Create an entry in the thread local logging stack using a const string, clearing all other entries.

Definition at line 407 of file strerror.c.

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◆ strerror_const_push()

static fr_log_entry_t * strerror_const_push	(	char const *	file,
		int	line,
		fr_log_buffer_t *	buffer,
		char const *	msg
	)

inlinestatic

Add a message to an existing stack of messages.

Parameters

[in]	file	the error occurred in.
[in]	line	the error occurred on.
[in]	buffer	to add the message to.
[in]	msg	To add to error stack. Must have a lifetime equal to that of the program.

Definition at line 464 of file strerror.c.

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◆ strerror_vprintf()

static fr_log_entry_t * strerror_vprintf	(	char const *	file,
		int	line,
		char const *	fmt,
		va_list	ap
	)

static

Create an entry in the thread local logging stack, clearing all other entries.

Note: Can't be inlined.

Definition at line 148 of file strerror.c.

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◆ strerror_vprintf_push()

static fr_log_entry_t * strerror_vprintf_push	(	char const *	file,
		int	line,
		fr_log_buffer_t *	buffer,
		char const *	fmt,
		va_list	ap
	)

static

Add a message to an existing stack of messages.

Parameters

[in]	file	the error occurred in.
[in]	line	the error occurred on.
[in]	buffer	The log buffer to allocate memory from.
[in]	fmt	printf style format string.
[in]	ap	Arguments for the error string.

Note: Can't be inline.

Definition at line 200 of file strerror.c.

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Variable Documentation

◆ fr_strerror_buffer

_Thread_local fr_log_buffer_t* fr_strerror_buffer

static

Definition at line 58 of file strerror.c.

◆ logging_stop

_Thread_local bool logging_stop

static

Due to ordering issues we may get errors being logged from within other thread local destructors which cause a crash on exit if the logging buffer has already been freed.

Definition at line 59 of file strerror.c.

Data Structures

Macros

Typedefs

Functions

Variables

Detailed Description

Data Structure Documentation

◆ fr_log_buffer_t

◆ fr_log_entry_s

Macro Definition Documentation

◆ FR_STRERROR_BUFSIZE

Typedef Documentation

◆ fr_log_entry_t

Function Documentation

◆ _fr_logging_free()

◆ _fr_strerror_const()

◆ _fr_strerror_const_push()

◆ _fr_strerror_const_push_head()

◆ _fr_strerror_marker_vprintf()

◆ _fr_strerror_marker_vprintf_push()

◆ _fr_strerror_marker_vprintf_push_head()

◆ _fr_strerror_vprintf()

◆ _fr_strerror_vprintf_push()

◆ _fr_strerror_vprintf_push_head()

◆ fr_perror()

◆ fr_perror_to_str()

◆ fr_strerror()

◆ fr_strerror_clear()

◆ fr_strerror_init()

◆ fr_strerror_marker()

◆ fr_strerror_marker_peek()

◆ fr_strerror_marker_pop()

◆ fr_strerror_peek()

◆ fr_strerror_pop()

◆ pool_alt()

◆ pool_alt_free_children()

◆ strerror_const()

◆ strerror_const_push()

◆ strerror_vprintf()

◆ strerror_vprintf_push()

Variable Documentation

◆ fr_strerror_buffer

◆ logging_stop