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`errno`

Explain errno numbers (QNX Neutrino)

Syntax:

errno error_number...

Runs on:

Neutrino

Options:

error_number: Error number to be explained.

Description:

The errno utility displays the string equivalent for the error_numbers supplied on the command line. The output is written to the standard output. If the command-line argument isn't a valid error number, a line is written to the standard error instead.

This utility is useful in cases where a program has indicated that a numerical error occurred and hasn't provided the ASCII string equivalent of that errno value. Users who don't have access to the C header file <errno.h> don't have the option of using:

grep error_number /usr/include/errno.h

The errno utility is more convenient and is available to all users.

Examples:

Find the string equivalent of error number 2:

$ errno 2
errno    2: ERROR ENOENT
$

Exit status:

>0: An error occurred (e.g. unknown errno value).
0: The error string was successfully written to the standard output.