BIO_seed() and BIO_tell() were documented in two other documents,

=pod

=head1 NAME

BIO_seek, BIO_tell - file BIO operations

=head1 SYNOPSIS

 #include <openssl/bio.h>

 #define BIO_seek(b,ofs)	(int)BIO_ctrl(b,BIO_C_FILE_SEEK,ofs,NULL)

 #define BIO_tell(b)		(int)BIO_ctrl(b,BIO_C_FILE_TELL,0,NULL)

=head1 DESCRIPTION

BIO_seek() sets the file position pointer to B<ofs> bytes from start of file.

BIO_tell() returns the current file position.

=head1 RETURN VALUES

BIO_seek() returns the same value as the underlying fseek() function:

0 for success or -1 for failure.

BIO_tell() returns the current file position.

=head1 SEE ALSO

TBA