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31.4.1 Definition of sysconf

— Function: long int sysconf (int parameter)

Preliminary: | MT-Safe env | AS-Unsafe lock heap | AC-Unsafe lock mem fd | See POSIX Safety Concepts.

This function is used to inquire about runtime system parameters. The parameter argument should be one of the ‘_SC_’ symbols listed below.

The normal return value from sysconf is the value you requested. A value of -1 is returned both if the implementation does not impose a limit, and in case of an error.

The following errno error conditions are defined for this function:

EINVAL
The value of the parameter is invalid.