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=pod
=head1 NAME
ERR_set_mark, ERR_pop_to_mark - set marks and pop errors until mark
=head1 SYNOPSIS
#include <openssl/err.h>
int ERR_set_mark(void);
int ERR_pop_to_mark(void);
=head1 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.
=head1 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.
=head1 SEE ALSO
L<err(3)|err(3)>
=head1 HISTORY
ERR_set_mark() and ERR_pop_to_mark() were added in OpenSSL 0.9.8.
=cut