__fprintf_chk

Name

__fprintf_chk -- convert formatted output, with stack checking

Synopsis

#include <stdio.h>

int __fprintf_chk(FILE * stream, int flag, const char * format);

Description

The interface __fprintf_chk() shall function in the same way as the interface fprintf(), except that __fprintf_chk() shall check for stack overflow before computing a result, depending on the value of the flag parameter. If an overflow is anticipated, the function shall abort and the program calling it shall exit.

In general, the higher the value of flag, the more security measures this interface shall take in the form of checking the stack, parameter values, and so on.

The __fprintf_chk() function is not in the source standard; it is only in the binary standard.