brlapi_error(3)

NAME
brlapi_error - Error handling

 - How to handle errors.

SYNOPSIS

  Data Structures
struct brlapi_error_t

  Macros
#define brlapi_error (*brlapi_error_location())
#define brlapi_errno (brlapi_error.brlerrno)
#define brlapi_libcerrno (brlapi_error.libcerrno)
#define brlapi_gaierrno (brlapi_error.gaierrno)
#define brlapi_errfun (brlapi_error.errfun)

  Typedefs
typedef uint32_t brlapi_packetType_t
typedef void(BRLAPI_STDCALL * brlapi_exceptionHandler_t) (int error, brlapi_packetType_t type, const void *packet, size_t size)
typedef void(BRLAPI_STDCALL * brlapi__exceptionHandler_t) (brlapi_handle_t *handle, int error, brlapi_packetType_t type, const void *packet, size_t size)

  Enumerations
enum brlapi_error { BRLAPI_ERROR_SUCCESS = 0, BRLAPI_ERROR_SUCCESS = 0, BRLAPI_ERROR_NOMEM = 1, BRLAPI_ERROR_NOMEM = 1, BRLAPI_ERROR_TTYBUSY = 2, BRLAPI_ERROR_TTYBUSY = 2, BRLAPI_ERROR_DEVICEBUSY = 3, BRLAPI_ERROR_DEVICEBUSY = 3, BRLAPI_ERROR_UNKNOWN_INSTRUCTION = 4, BRLAPI_ERROR_UNKNOWN_INSTRUCTION = 4, BRLAPI_ERROR_ILLEGAL_INSTRUCTION = 5, BRLAPI_ERROR_ILLEGAL_INSTRUCTION = 5, BRLAPI_ERROR_INVALID_PARAMETER = 6, BRLAPI_ERROR_INVALID_PARAMETER = 6, BRLAPI_ERROR_INVALID_PACKET = 7, BRLAPI_ERROR_INVALID_PACKET = 7, BRLAPI_ERROR_CONNREFUSED = 8, BRLAPI_ERROR_CONNREFUSED = 8, BRLAPI_ERROR_OPNOTSUPP = 9, BRLAPI_ERROR_OPNOTSUPP = 9, BRLAPI_ERROR_GAIERR = 10, BRLAPI_ERROR_GAIERR = 10, BRLAPI_ERROR_LIBCERR = 11, BRLAPI_ERROR_LIBCERR = 11, BRLAPI_ERROR_UNKNOWNTTY = 12, BRLAPI_ERROR_UNKNOWNTTY = 12, BRLAPI_ERROR_PROTOCOL_VERSION = 13, BRLAPI_ERROR_PROTOCOL_VERSION = 13, BRLAPI_ERROR_EOF = 14, BRLAPI_ERROR_EOF = 14, BRLAPI_ERROR_EMPTYKEY = 15, BRLAPI_ERROR_EMPTYKEY = 15, BRLAPI_ERROR_DRIVERERROR = 16, BRLAPI_ERROR_DRIVERERROR = 16, BRLAPI_ERROR_AUTHENTICATION = 17, BRLAPI_ERROR_AUTHENTICATION = 17, BRLAPI_ERROR_READONLY_PARAMETER = 18, BRLAPI_ERROR_READONLY_PARAMETER = 18 }

  Functions
void BRLAPI_STDCALL brlapi_perror (const char *s)
brlapi_error_t *BRLAPI_STDCALL brlapi_error_location (void)
const char *BRLAPI_STDCALL brlapi_strerror (const brlapi_error_t *error)
size_t BRLAPI_STDCALL brlapi_strerror_r (const brlapi_error_t *error, char *buf, size_t buflen)
const char *BRLAPI_STDCALL brlapi_getPacketTypeName (brlapi_packetType_t type)
int BRLAPI_STDCALL brlapi_strexception (char *buffer, size_t bufferSize, int error, brlapi_packetType_t type, const void *packet, size_t packetSize)
int BRLAPI_STDCALL brlapi__strexception (brlapi_handle_t *handle, char *buffer, size_t bufferSize, int error, brlapi_packetType_t type, const void *packet, size_t packetSize)
brlapi_exceptionHandler_t BRLAPI_STDCALL brlapi_setExceptionHandler (brlapi_exceptionHandler_t handler)
brlapi__exceptionHandler_t BRLAPI_STDCALL brlapi__setExceptionHandler (brlapi_handle_t *handle, brlapi__exceptionHandler_t handler)
void BRLAPI_STDCALL brlapi_defaultExceptionHandler (int error, brlapi_packetType_t type, const void *packet, size_t size)
void BRLAPI_STDCALL brlapi__defaultExceptionHandler (brlapi_handle_t *handle, int error, brlapi_packetType_t type, const void *packet, size_t size)

  Variables
const char * brlapi_errlist []
const int brlapi_nerr
brlapi_error_t brlapi_error
enum brlapi_error brlapi_errno
int brlapi_libcerrno
int brlapi_gaierrno
const char * brlapi_errfun

Detailed Description

When a function fails, brlapi_errno will hold an error code to explain why it failed. It should always be reported somehow.

Although most errors are reported that way, some (called exceptions) are reported asynchronously for efficiency reasons, because they always just report a programming error. The affected functions are: brlapi_setFocus, brlapi_write* and brlapi_sendRaw. When they happen, the next call to brlapi_something will close the connection and call the exception handler. If the exception handler returns, the brlapi_something function will return an end-of-file error.

The default exception handler (brlapi_defaultExceptionHandler()) dumps the guilty packet before abort()ing. It can be replaced by calling brlapi_setExceptionHandler(). For instance, the Java and Python bindings use this for raising a Java or Python exception that may be caught.

Macro Definition Documentation

  #define brlapi_errfun (brlapi_error.errfun)
Cheat about the brlapi_errfun C token

Referenced by brlapi_error_location().

  #define brlapi_errno (brlapi_error.brlerrno)
Cheat about the brlapi_errno C token

Referenced by brlapi_error_location().

  #define brlapi_error (*brlapi_error_location())
Cheat about the brlapi_error C token

Referenced by brlapi_error_location().

  #define brlapi_gaierrno (brlapi_error.gaierrno)
Cheat about the brlapi_gaierrno C token

Referenced by brlapi_error_location().

  #define brlapi_libcerrno (brlapi_error.libcerrno)
Cheat about the brlapi_libcerrno C token

Referenced by brlapi_error_location().

Typedef Documentation

  typedef void(BRLAPI_STDCALL * brlapi__exceptionHandler_t) (brlapi_handle_t *handle, int error, brlapi_packetType_t type, const void *packet, size_t size)

  typedef void(BRLAPI_STDCALL * brlapi_exceptionHandler_t) (int error, brlapi_packetType_t type, const void *packet, size_t size)
Types for exception handlers

Types of exception handlers which are to be given to brlapi_setExceptionHandler() and brlapi__setExceptionHandler().

Parameters
    error is a BRLAPI_ERROR_ error code;
    type is the type of the guilty packet;
    packet points to the content of the guilty packet (might be a little bit truncated);
    size gives the guilty packet's size.

  typedef uint32_t brlapi_packetType_t
Type for packet type. Only unsigned can cross networks, 32bits

Enumeration Type Documentation

  enum brlapi_error
BrlAPI Error codes

Enumerator

BRLAPI_ERROR_SUCCESS
    Success

BRLAPI_ERROR_SUCCESS
    Success

BRLAPI_ERROR_NOMEM
    Not enough memory

BRLAPI_ERROR_NOMEM
    Not enough memory

BRLAPI_ERROR_TTYBUSY
    A connection is already running in this tty

BRLAPI_ERROR_TTYBUSY
    A connection is already running in this tty

BRLAPI_ERROR_DEVICEBUSY
    A connection is already using RAW or suspend mode

BRLAPI_ERROR_DEVICEBUSY
    A connection is already using RAW or suspend mode

BRLAPI_ERROR_UNKNOWN_INSTRUCTION
    Not implemented in protocol

BRLAPI_ERROR_UNKNOWN_INSTRUCTION
    Not implemented in protocol

BRLAPI_ERROR_ILLEGAL_INSTRUCTION
    Forbiden in current mode

BRLAPI_ERROR_ILLEGAL_INSTRUCTION
    Forbiden in current mode

BRLAPI_ERROR_INVALID_PARAMETER
    Out of range or have no sense

BRLAPI_ERROR_INVALID_PARAMETER
    Out of range or have no sense

BRLAPI_ERROR_INVALID_PACKET
    Invalid size

BRLAPI_ERROR_INVALID_PACKET
    Invalid size

BRLAPI_ERROR_CONNREFUSED
    Connection refused

BRLAPI_ERROR_CONNREFUSED
    Connection refused

BRLAPI_ERROR_OPNOTSUPP
    Operation not supported

BRLAPI_ERROR_OPNOTSUPP
    Operation not supported

BRLAPI_ERROR_GAIERR
    Getaddrinfo error

BRLAPI_ERROR_GAIERR
    Getaddrinfo error

BRLAPI_ERROR_LIBCERR
    Libc error

BRLAPI_ERROR_LIBCERR
    Libc error

BRLAPI_ERROR_UNKNOWNTTY
    Couldn't find out the tty number

BRLAPI_ERROR_UNKNOWNTTY
    Couldn't find out the tty number

BRLAPI_ERROR_PROTOCOL_VERSION
    Bad protocol version

BRLAPI_ERROR_PROTOCOL_VERSION
    Bad protocol version

BRLAPI_ERROR_EOF
    Unexpected end of file

BRLAPI_ERROR_EOF
    Unexpected end of file

BRLAPI_ERROR_EMPTYKEY
    Key file empty

BRLAPI_ERROR_EMPTYKEY
    Key file empty

BRLAPI_ERROR_DRIVERERROR
    Packet returned by driver too large

BRLAPI_ERROR_DRIVERERROR
    Packet returned by driver too large

BRLAPI_ERROR_AUTHENTICATION
    Authentication failed

BRLAPI_ERROR_AUTHENTICATION
    Authentication failed

BRLAPI_ERROR_READONLY_PARAMETER
    Parameter can not be changed

BRLAPI_ERROR_READONLY_PARAMETER
    Parameter can not be changed

Function Documentation

  void BRLAPI_STDCALL brlapi__defaultExceptionHandler (brlapi_handle_t * handle, int error, brlapi_packetType_t type, const void * packet, size_t size)

References BRLAPI_STDCALL.

  brlapi__exceptionHandler_t BRLAPI_STDCALL brlapi__setExceptionHandler (brlapi_handle_t * handle, brlapi__exceptionHandler_t handler)

References BRLAPI_STDCALL.

  int BRLAPI_STDCALL brlapi__strexception (brlapi_handle_t * handle, char * buffer, size_t bufferSize, int error, brlapi_packetType_t type, const void * packet, size_t packetSize)

References BRLAPI_STDCALL.

  void BRLAPI_STDCALL brlapi_defaultExceptionHandler (int error, brlapi_packetType_t type, const void * packet, size_t size)

References BRLAPI_STDCALL.

  brlapi_error_t *BRLAPI_STDCALL brlapi_error_location (void )
Get per-thread error location

In multithreaded software, brlapi_error is thread-specific, so api.h cheats about the brlapi_error token and actually calls brlapi_error_location().

This gets the thread specific location of global variable brlapi_error

References brlapi_errfun, brlapi_errno, brlapi_error, brlapi_gaierrno, brlapi_libcerrno, and BRLAPI_STDCALL.

  const char *BRLAPI_STDCALL brlapi_getPacketTypeName (brlapi_packetType_t type)
Get plain packet type

brlapi_getPacketTypeName() returns the plain packet type name corresponding to its argument.

References BRLAPI_STDCALL.

  void BRLAPI_STDCALL brlapi_perror (const char * s)
Print a BrlAPI error message

brlapi_perror() reads brlapi_error, and acts just like perror().

References BRLAPI_STDCALL.

  brlapi_exceptionHandler_t BRLAPI_STDCALL brlapi_setExceptionHandler (brlapi_exceptionHandler_t handler)
Set a new exception handler

brlapi_setExceptionHandler() replaces the previous exception handler with the handler parameter. The previous exception handler is returned to make chaining error handlers possible.

The default handler just prints the exception and abort()s.

References BRLAPI_STDCALL.

  const char *BRLAPI_STDCALL brlapi_strerror (const brlapi_error_t * error)
Get plain error message

brlapi_strerror() returns the plain error message corresponding to its argument. Since the message is a constant string, the application must not free it. Also, this makes it unsafe in threaded environments, brlapi_strerror_r() should be used instead in that case.

References BRLAPI_STDCALL.

  size_t BRLAPI_STDCALL brlapi_strerror_r (const brlapi_error_t * error, char * buf, size_t buflen)
Store plain error message

brlapi_strerror_r() stores the plain error message corresponding to its error argument. buflen has to be set to the size of buf, and brlapi_strerror_r() will store at most buflen bytes in buf. If buflen is not large enough for the whole error message, it will be truncated, but a trailing \0 character will still be set at buf[buflen-1].

Returns
    the number of characters that should have been stored in buf (without the trailing \0 character). A value greater or equal to buflen thus means that the output was truncated.

If buflen is set to 0, buf can be set to NULL, and brlapi_strerror_r will thus only return the number of characters that would have been stored (without the trailing \0 character).

References BRLAPI_STDCALL.

  int BRLAPI_STDCALL brlapi_strexception (char * buffer, size_t bufferSize, int error, brlapi_packetType_t type, const void * packet, size_t packetSize)
Describes an exception

brlapi_strexception() puts a text describing the given exception in buffer.

The beginning of the guilty packet is dumped as a sequence of hex bytes.

Returns
    the size of the text describing the exception, following snprintf()'s semantics.

References BRLAPI_STDCALL.

Variable Documentation

  const char* brlapi_errfun [extern]
Shorthand for brlapi_error.errfun

  const char* brlapi_errlist[] [extern]
Error message list

These are the string constants used by brlapi_perror().

  enum brlapi_error brlapi_errno [extern]
Shorthand for brlapi_error.errno

  brlapi_error_t brlapi_error [extern]
Global variable brlapi_error

brlapi_error is a global left-value containing the last error information. Its errno field is not reset to BRLAPI_ERROR_SUCCESS on success.

This information may be copied in brlapi_error_t variables for later use with the brlapi_strerror function.

  int brlapi_gaierrno [extern]
Shorthand for brlapi_error.gaierrno

  int brlapi_libcerrno [extern]
Shorthand for brlapi_error.libcerrno

  const int brlapi_nerr [extern]
Number of error messages

Author

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