firefox-main/docs/nspr/reference/nspr_log_modules.md

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# NSPR_LOG_MODULES
This environment variable specifies which log modules have logging
enabled.
## Syntax
```
moduleName:level[, moduleName:level]*
```
*moduleName* is the name specified in a
call or one of the handy magic names listed below.
*level* is a numeric value between 0 and 5, with the values having the
following meanings:
- 0 = PR_LOG_NONE: nothing should be logged
- 1 = PR_LOG_ALWAYS: important; intended to always be logged
- 2 = PR_LOG_ERROR: errors
- 3 = PR_LOG_WARNING: warnings
- 4 = PR_LOG_DEBUG: debug messages, notices
- 5: everything!
## Description
Specify a `moduleName` that is associated with the `name` argument
in a call to
and a non-zero `level` value to enable logging for the named
`moduleName`.
Special log module names are provided for controlling NSPR's log service
at execution time. These controls should be set in the
{ref}`NSPR_LOG_MODULES` environment variable at execution time to affect
NSPR's log service for your application.
- **all** The name `all` enables all log modules. To enable all log
module calls to
set the variable as follows:
```
set NSPR_LOG_MODULES=all:5
```
- **timestamp** Including `timestamp` results in a timestamp of the
form "2015-01-15 21:24:26.049906 UTC - " prefixing every logged line.
- **append** Including `append` results in log entries being appended
to the existing contents of the file referenced by NSPR_LOG_FILE. If
not specified, the existing contents of NSPR_LOG_FILE will be lost as
a new file is created with the same filename.
- **sync** The name `sync` enables unbuffered logging. This ensures
that all log messages are flushed to the operating system as they are
written, but may slow the program down.
- **bufsize:size** The name `bufsize:`*size* sets the log buffer to
*size*.
## Examples
Log everything from the Toolkit::Storage component that happens,
prefixing each line with the timestamp when it was logged to the file
/tmp/foo.log (which will be replaced each time the executable is run).
```
set NSPR_LOG_MODULES=timestamp,mozStorage:5
set NSPR_LOG_FILE=/tmp/foo.log
```
(logging-with-try-server)=
## Logging with Try Server
- For **mochitest**, edit variable {ref}`NSPR_LOG_MODULES` in
`testing/mochitest/runtests.py` before pushing to try. You would be
able to download the log file as an artifact from the Log viewer.
- (other tests?)