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The GNU C Library

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31.4.1 Definition of sysconf

Function: long int sysconf (int parameter)
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:

The value of the parameter is invalid.

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