centos man page for err_set_mark

ERR_set_mark(3) 						      OpenSSL							   ERR_set_mark(3)

NAME
       ERR_set_mark, ERR_pop_to_mark - set marks and pop errors until mark

SYNOPSIS
	#include <openssl/err.h>

	int ERR_set_mark(void);

	int ERR_pop_to_mark(void);

DESCRIPTION
       ERR_set_mark() sets a mark on the current topmost error record if there is one.

       ERR_pop_to_mark() will pop the top of the error stack until a mark is found.  The mark is then removed.	If there is no mark, the whole
       stack is removed.

RETURN VALUES
       ERR_set_mark() returns 0 if the error stack is empty, otherwise 1.

       ERR_pop_to_mark() returns 0 if there was no mark in the error stack, which implies that the stack became empty, otherwise 1.

SEE ALSO
       err(3)

HISTORY
       ERR_set_mark() and ERR_pop_to_mark() were added in OpenSSL 0.9.8.

1.0.1e								    2013-02-11							   ERR_set_mark(3)