snmpa_error_report(3erl) Erlang Module Definition snmpa_error_report(3erl)NAME
snmpa_error_report - Behaviour module for reporting SNMP agent errors
DESCRIPTION
This module defines the behaviour of the agent error reporting. A snmpa_error_report compliant module must export the following functions:
* config_err/2
* user_err/2
The semantics of them and their exact signatures are explained below.
EXPORTS
config_err(Format, Args) -> void()
Types Format = string()
Args = list()
The function is called if an error occurs during the configuration phase, for example if a syntax error is found in a configuration
file.
Format and Args are as in io:format(Format, Args) .
user_err(Format, Args) -> void()
Types Format = string()
Args = list()
The function is called if a user related error occurs at run-time, for example if a user defined instrumentation function returns
erroneous.
Format and Args are as in io:format(Format, Args) .
Ericsson AB snmp 4.19 snmpa_error_report(3erl)
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error_handler(3erl) Erlang Module Definition error_handler(3erl)NAME
error_handler - Default System Error Handler
DESCRIPTION
The error handler module defines what happens when certain types of errors occur.
EXPORTS
undefined_function(Module, Function, Args) -> term()
Types Module = Function = atom()
Args = [term()]
A (possibly empty) list of arguments Arg1,..,ArgN
This function is evaluated if a call is made to Module:Function(Arg1,.., ArgN) and Module:Function/N is undefined. Note that unde-
fined_function/3 is evaluated inside the process making the original call.
If Module is interpreted, the interpreter is invoked and the return value of the interpreted Function(Arg1,.., ArgN) call is
returned.
Otherwise, it returns, if possible, the value of apply(Module, Function, Args) after an attempt has been made to autoload Module .
If this is not possible, the call to Module:Function(Arg1,.., ArgN) fails with exit reason undef .
undefined_lambda(Module, Fun, Args) -> term()
Types Module = Function = atom()
Args = [term()]
A (possibly empty) list of arguments Arg1,..,ArgN
This function is evaluated if a call is made to Fun(Arg1,.., ArgN) when the module defining the fun is not loaded. The function is
evaluated inside the process making the original call.
If Module is interpreted, the interpreter is invoked and the return value of the interpreted Fun(Arg1,.., ArgN) call is returned.
Otherwise, it returns, if possible, the value of apply(Fun, Args) after an attempt has been made to autoload Module . If this is not
possible, the call fails with exit reason undef .
NOTES
The code in error_handler is complex and should not be changed without fully understanding the interaction between the error handler, the
init process of the code server, and the I/O mechanism of the code.
Changes in the code which may seem small can cause a deadlock as unforeseen consequences may occur. The use of input is dangerous in this
type of code.
Ericsson AB kernel 2.14.3 error_handler(3erl)
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