Add BIO_seek() and BIO_tell() to the BIO control functions manual.

[openssl.git] / doc / crypto / BIO_ctrl.pod

diff --git a/doc/crypto/BIO_ctrl.pod b/doc/crypto/BIO_ctrl.pod
index dfec0196146e871aafb555f2493db58271c0ad95..acc46db8ce74044542ee17880cf83b074124c15e 100644 (file)
--- a/doc/crypto/BIO_ctrl.pod
+++ b/doc/crypto/BIO_ctrl.pod
@@ -2,7 +2,10 @@
 
 =head1 NAME
 
-       BIO_ctrl, BIO_callback_ctrl, BIO_ptr_ctrl, BIO_int_ctrl - BIO control operations
+BIO_ctrl, BIO_callback_ctrl, BIO_ptr_ctrl, BIO_int_ctrl, BIO_reset,
+BIO_seek, BIO_tell, BIO_flush, BIO_eof, BIO_set_close, BIO_get_close,
+BIO_pending, BIO_wpending, BIO_ctrl_pending, BIO_ctrl_wpending,
+BIO_get_info_callback, BIO_set_info_callback - BIO control operations
 
 =head1 SYNOPSIS
 
@@ -14,6 +17,8 @@
  long BIO_int_ctrl(BIO *bp,int cmd,long larg,int iarg);
 
  int BIO_reset(BIO *b);
+ int BIO_seek(BIO *b, int ofs);
+ int BIO_tell(BIO *b);
  int BIO_flush(BIO *b);
  int BIO_eof(BIO *b);
  int BIO_set_close(BIO *b,long flag);
@@ -38,8 +43,14 @@ specific to a particular type of BIO are described in the specific
 BIOs manual page as well as any special features of the standard
 calls.
 
-BIO_reset() typically reset a BIO to some initial state, in the case
-of file related BIOs for example it rewinds the file pointer.
+BIO_reset() typically resets a BIO to some initial state, in the case
+of file related BIOs for example it rewinds the file pointer to the
+start of the file.
+
+BIO_seek() resets a file related BIO's file position pointer to B<ofs>
+bytes from start of file.
+
+BIO_tell() returns the current file position of a file related BIO.
 
 BIO_flush() normally writes out any internally buffered data, in some
 cases it is used to signal EOF and that no more data will be written.
@@ -55,14 +66,17 @@ be closed when the BIO is freed.
 BIO_get_close() returns the BIOs close flag.
 
 BIO_pending(), BIO_ctrl_pending(), BIO_wpending() and BIO_ctrl_wpending()
-return the number of pending characterers in the BIOs read and write buffers.
+return the number of pending characters in the BIOs read and write buffers.
 Not all BIOs support these calls. BIO_ctrl_pending() and BIO_ctrl_wpending()
 return a size_t type and are functions, BIO_pending() and BIO_wpending() are
 macros which call BIO_ctrl().
 
 =head1 RETURN VALUES
 
-BIO_reset() returns 1 fo success and 0 for failure.
+BIO_reset() returns 1 for success and 0 for failure.
+
+BIO_seek() and BIO_tell() both return the current file position on success
+and -1 for failure.
 
 BIO_flush() returns 1 for success and 0 or -1 for failure.
 
@@ -88,6 +102,15 @@ case of a file BIO some data may be available in the FILE structures
 internal buffers but it is not possible to determine this in a
 portably way. For other types of BIO they may not be supported.
 
+Filter BIOs if the do not internally handle a particular BIO_ctrl()
+operation usually pass the operation to the next BIO in the chain.
+This often means there is no need to locate the required BIO for
+a particular operation, it can be called on a chain and it will
+be automatically passed to the relevant BIO.
+
+Source/sink BIOs will return an error if the do not recognize the
+BIO_ctrl() operation.
+
 =head1 SEE ALSO
 
 TBA