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Diffstat (limited to 'secure/lib/libcrypto/man/BIO_ctrl.3')
| -rw-r--r-- | secure/lib/libcrypto/man/BIO_ctrl.3 | 252 |
1 files changed, 252 insertions, 0 deletions
diff --git a/secure/lib/libcrypto/man/BIO_ctrl.3 b/secure/lib/libcrypto/man/BIO_ctrl.3 new file mode 100644 index 0000000..6b84afd --- /dev/null +++ b/secure/lib/libcrypto/man/BIO_ctrl.3 @@ -0,0 +1,252 @@ +.\" Automatically generated by Pod::Man 2.25 (Pod::Simple 3.23) +.\" +.\" Standard preamble: +.\" ======================================================================== +.de Sp \" Vertical space (when we can't use .PP) +.if t .sp .5v +.if n .sp +.. +.de Vb \" Begin verbatim text +.ft CW +.nf +.ne \\$1 +.. +.de Ve \" End verbatim text +.ft R +.fi +.. +.\" Set up some character translations and predefined strings. \*(-- will +.\" give an unbreakable dash, \*(PI will give pi, \*(L" will give a left +.\" double quote, and \*(R" will give a right double quote. \*(C+ will +.\" give a nicer C++. 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Always turn off hyphenation; it makes +.\" way too many mistakes in technical documents. +.if n .ad l +.nh +.SH "NAME" +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 +.SH "SYNOPSIS" +.IX Header "SYNOPSIS" +.Vb 1 +\& #include <openssl/bio.h> +\& +\& long BIO_ctrl(BIO *bp,int cmd,long larg,void *parg); +\& long BIO_callback_ctrl(BIO *b, int cmd, void (*fp)(struct bio_st *, int, const char *, int, long, long)); +\& char * BIO_ptr_ctrl(BIO *bp,int cmd,long larg); +\& 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); +\& int BIO_get_close(BIO *b); +\& int BIO_pending(BIO *b); +\& int BIO_wpending(BIO *b); +\& size_t BIO_ctrl_pending(BIO *b); +\& size_t BIO_ctrl_wpending(BIO *b); +\& +\& int BIO_get_info_callback(BIO *b,bio_info_cb **cbp); +\& int BIO_set_info_callback(BIO *b,bio_info_cb *cb); +\& +\& typedef void bio_info_cb(BIO *b, int oper, const char *ptr, int arg1, long arg2, long arg3); +.Ve +.SH "DESCRIPTION" +.IX Header "DESCRIPTION" +\&\fIBIO_ctrl()\fR, \fIBIO_callback_ctrl()\fR, \fIBIO_ptr_ctrl()\fR and \fIBIO_int_ctrl()\fR +are \s-1BIO\s0 \*(L"control\*(R" operations taking arguments of various types. +These functions are not normally called directly, various macros +are used instead. The standard macros are described below, macros +specific to a particular type of \s-1BIO\s0 are described in the specific +BIOs manual page as well as any special features of the standard +calls. +.PP +\&\fIBIO_reset()\fR typically resets a \s-1BIO\s0 to some initial state, in the case +of file related BIOs for example it rewinds the file pointer to the +start of the file. +.PP +\&\fIBIO_seek()\fR resets a file related \s-1BIO\s0's (that is file descriptor and +\&\s-1FILE\s0 BIOs) file position pointer to \fBofs\fR bytes from start of file. +.PP +\&\fIBIO_tell()\fR returns the current file position of a file related \s-1BIO\s0. +.PP +\&\fIBIO_flush()\fR normally writes out any internally buffered data, in some +cases it is used to signal \s-1EOF\s0 and that no more data will be written. +.PP +\&\fIBIO_eof()\fR returns 1 if the \s-1BIO\s0 has read \s-1EOF\s0, the precise meaning of +\&\*(L"\s-1EOF\s0\*(R" varies according to the \s-1BIO\s0 type. +.PP +\&\fIBIO_set_close()\fR sets the \s-1BIO\s0 \fBb\fR close flag to \fBflag\fR. \fBflag\fR can +take the value \s-1BIO_CLOSE\s0 or \s-1BIO_NOCLOSE\s0. Typically \s-1BIO_CLOSE\s0 is used +in a source/sink \s-1BIO\s0 to indicate that the underlying I/O stream should +be closed when the \s-1BIO\s0 is freed. +.PP +\&\fIBIO_get_close()\fR returns the BIOs close flag. +.PP +\&\fIBIO_pending()\fR, \fIBIO_ctrl_pending()\fR, \fIBIO_wpending()\fR and \fIBIO_ctrl_wpending()\fR +return the number of pending characters in the BIOs read and write buffers. +Not all BIOs support these calls. \fIBIO_ctrl_pending()\fR and \fIBIO_ctrl_wpending()\fR +return a size_t type and are functions, \fIBIO_pending()\fR and \fIBIO_wpending()\fR are +macros which call \fIBIO_ctrl()\fR. +.SH "RETURN VALUES" +.IX Header "RETURN VALUES" +\&\fIBIO_reset()\fR normally returns 1 for success and 0 or \-1 for failure. File +BIOs are an exception, they return 0 for success and \-1 for failure. +.PP +\&\fIBIO_seek()\fR and \fIBIO_tell()\fR both return the current file position on success +and \-1 for failure, except file BIOs which for \fIBIO_seek()\fR always return 0 +for success and \-1 for failure. +.PP +\&\fIBIO_flush()\fR returns 1 for success and 0 or \-1 for failure. +.PP +\&\fIBIO_eof()\fR returns 1 if \s-1EOF\s0 has been reached 0 otherwise. +.PP +\&\fIBIO_set_close()\fR always returns 1. +.PP +\&\fIBIO_get_close()\fR returns the close flag value: \s-1BIO_CLOSE\s0 or \s-1BIO_NOCLOSE\s0. +.PP +\&\fIBIO_pending()\fR, \fIBIO_ctrl_pending()\fR, \fIBIO_wpending()\fR and \fIBIO_ctrl_wpending()\fR +return the amount of pending data. +.SH "NOTES" +.IX Header "NOTES" +\&\fIBIO_flush()\fR, because it can write data may return 0 or \-1 indicating +that the call should be retried later in a similar manner to \fIBIO_write()\fR. +The \fIBIO_should_retry()\fR call should be used and appropriate action taken +is the call fails. +.PP +The return values of \fIBIO_pending()\fR and \fIBIO_wpending()\fR may not reliably +determine the amount of pending data in all cases. For example in the +case of a file \s-1BIO\s0 some data may be available in the \s-1FILE\s0 structures +internal buffers but it is not possible to determine this in a +portably way. For other types of \s-1BIO\s0 they may not be supported. +.PP +Filter BIOs if they do not internally handle a particular \fIBIO_ctrl()\fR +operation usually pass the operation to the next \s-1BIO\s0 in the chain. +This often means there is no need to locate the required \s-1BIO\s0 for +a particular operation, it can be called on a chain and it will +be automatically passed to the relevant \s-1BIO\s0. However this can cause +unexpected results: for example no current filter BIOs implement +\&\fIBIO_seek()\fR, but this may still succeed if the chain ends in a \s-1FILE\s0 +or file descriptor \s-1BIO\s0. +.PP +Source/sink BIOs return an 0 if they do not recognize the \fIBIO_ctrl()\fR +operation. +.SH "BUGS" +.IX Header "BUGS" +Some of the return values are ambiguous and care should be taken. In +particular a return value of 0 can be returned if an operation is not +supported, if an error occurred, if \s-1EOF\s0 has not been reached and in +the case of \fIBIO_seek()\fR on a file \s-1BIO\s0 for a successful operation. +.SH "SEE ALSO" +.IX Header "SEE ALSO" +\&\s-1TBA\s0 |
