2 Error Logging
2.1 Error Information From the Runtime System
Error information from the runtime system, that is, information about a process terminating because of an uncaught error exception, is by default written to terminal (tty):
=ERROR REPORT==== 9-Dec-2003::13:25:02 ===
Error in process <0.27.0> with exit value: {{badmatch,[1,2,3]},[{m,f,1},{shell,eval_loop,2}]}The error information is handled by the error logger, a system process registered as error_logger. This process receives all error messages from the Erlang runtime system as well as from the standard behaviours and different Erlang/OTP applications.
The exit reasons (such as badarg) used by the runtime system are described in Errors and Error Handling.
For information about the process error_logger and its user interface (with the same name), see the error_logger(3) manual page in Kernel. The system can be configured so that error information is written to file or to tty, or both. In addition, user-defined applications can send and format error information using error_logger.
2.2 SASL Error Logging
The standard behaviours (supervisor, gen_server, and so on) send progress and error information to error_logger. If the SASL application is started, this information is written to tty as well. For more information, see SASL Error Logging in the SASL User's Guide.
% erl -boot start_sasl
Erlang (BEAM) emulator version 5.4.13 [hipe] [threads:0] [kernel-poll]
=PROGRESS REPORT==== 31-Mar-2006::12:45:58 ===
supervisor: {local,sasl_safe_sup}
started: [{pid,<0.33.0>},
{name,alarm_handler},
{mfa,{alarm_handler,start_link,[]}},
{restart_type,permanent},
{shutdown,2000},
{child_type,worker}]
=PROGRESS REPORT==== 31-Mar-2006::12:45:58 ===
supervisor: {local,sasl_safe_sup}
started: [{pid,<0.34.0>},
{name,overload},
{mfa,{overload,start_link,[]}},
{restart_type,permanent},
{shutdown,2000},
{child_type,worker}]
=PROGRESS REPORT==== 31-Mar-2006::12:45:58 ===
supervisor: {local,sasl_sup}
started: [{pid,<0.32.0>},
{name,sasl_safe_sup},
{mfa,{supervisor,
start_link,
[{local,sasl_safe_sup},sasl,safe]}},
{restart_type,permanent},
{shutdown,infinity},
{child_type,supervisor}]
=PROGRESS REPORT==== 31-Mar-2006::12:45:58 ===
supervisor: {local,sasl_sup}
started: [{pid,<0.35.0>},
{name,release_handler},
{mfa,{release_handler,start_link,[]}},
{restart_type,permanent},
{shutdown,2000},
{child_type,worker}]
=PROGRESS REPORT==== 31-Mar-2006::12:45:58 ===
application: sasl
started_at: nonode@nohost
Eshell V5.4.13 (abort with ^G)
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