287 lines
8.8 KiB
Groff
287 lines
8.8 KiB
Groff
.\" $NetBSD: BIO_s_file.3,v 1.11 2005/04/24 00:10:03 wiz Exp $
|
|
.\"
|
|
.\" Automatically generated by Pod::Man v1.37, Pod::Parser v1.14
|
|
.\"
|
|
.\" Standard preamble:
|
|
.\" ========================================================================
|
|
.de Sh \" Subsection heading
|
|
.br
|
|
.if t .Sp
|
|
.ne 5
|
|
.PP
|
|
\fB\\$1\fR
|
|
.PP
|
|
..
|
|
.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. | will give a
|
|
.\" real vertical bar. \*(C+ will give a nicer C++. Capital omega is used to
|
|
.\" do unbreakable dashes and therefore won't be available. \*(C` and \*(C'
|
|
.\" expand to `' in nroff, nothing in troff, for use with C<>.
|
|
.tr \(*W-|\(bv\*(Tr
|
|
.ds C+ C\v'-.1v'\h'-1p'\s-2+\h'-1p'+\s0\v'.1v'\h'-1p'
|
|
.ie n \{\
|
|
. ds -- \(*W-
|
|
. ds PI pi
|
|
. if (\n(.H=4u)&(1m=24u) .ds -- \(*W\h'-12u'\(*W\h'-12u'-\" diablo 10 pitch
|
|
. if (\n(.H=4u)&(1m=20u) .ds -- \(*W\h'-12u'\(*W\h'-8u'-\" diablo 12 pitch
|
|
. ds L" ""
|
|
. ds R" ""
|
|
. ds C` ""
|
|
. ds C' ""
|
|
'br\}
|
|
.el\{\
|
|
. ds -- \|\(em\|
|
|
. ds PI \(*p
|
|
. ds L" ``
|
|
. ds R" ''
|
|
'br\}
|
|
.\"
|
|
.\" If the F register is turned on, we'll generate index entries on stderr for
|
|
.\" titles (.TH), headers (.SH), subsections (.Sh), items (.Ip), and index
|
|
.\" entries marked with X<> in POD. Of course, you'll have to process the
|
|
.\" output yourself in some meaningful fashion.
|
|
.if \nF \{\
|
|
. de IX
|
|
. tm Index:\\$1\t\\n%\t"\\$2"
|
|
..
|
|
. nr % 0
|
|
. rr F
|
|
.\}
|
|
.\"
|
|
.\" For nroff, turn off justification. Always turn off hyphenation; it makes
|
|
.\" way too many mistakes in technical documents.
|
|
.hy 0
|
|
.if n .na
|
|
.\"
|
|
.\" Accent mark definitions (@(#)ms.acc 1.5 88/02/08 SMI; from UCB 4.2).
|
|
.\" Fear. Run. Save yourself. No user-serviceable parts.
|
|
. \" fudge factors for nroff and troff
|
|
.if n \{\
|
|
. ds #H 0
|
|
. ds #V .8m
|
|
. ds #F .3m
|
|
. ds #[ \f1
|
|
. ds #] \fP
|
|
.\}
|
|
.if t \{\
|
|
. ds #H ((1u-(\\\\n(.fu%2u))*.13m)
|
|
. ds #V .6m
|
|
. ds #F 0
|
|
. ds #[ \&
|
|
. ds #] \&
|
|
.\}
|
|
. \" simple accents for nroff and troff
|
|
.if n \{\
|
|
. ds ' \&
|
|
. ds ` \&
|
|
. ds ^ \&
|
|
. ds , \&
|
|
. ds ~ ~
|
|
. ds /
|
|
.\}
|
|
.if t \{\
|
|
. ds ' \\k:\h'-(\\n(.wu*8/10-\*(#H)'\'\h"|\\n:u"
|
|
. ds ` \\k:\h'-(\\n(.wu*8/10-\*(#H)'\`\h'|\\n:u'
|
|
. ds ^ \\k:\h'-(\\n(.wu*10/11-\*(#H)'^\h'|\\n:u'
|
|
. ds , \\k:\h'-(\\n(.wu*8/10)',\h'|\\n:u'
|
|
. ds ~ \\k:\h'-(\\n(.wu-\*(#H-.1m)'~\h'|\\n:u'
|
|
. ds / \\k:\h'-(\\n(.wu*8/10-\*(#H)'\z\(sl\h'|\\n:u'
|
|
.\}
|
|
. \" troff and (daisy-wheel) nroff accents
|
|
.ds : \\k:\h'-(\\n(.wu*8/10-\*(#H+.1m+\*(#F)'\v'-\*(#V'\z.\h'.2m+\*(#F'.\h'|\\n:u'\v'\*(#V'
|
|
.ds 8 \h'\*(#H'\(*b\h'-\*(#H'
|
|
.ds o \\k:\h'-(\\n(.wu+\w'\(de'u-\*(#H)/2u'\v'-.3n'\*(#[\z\(de\v'.3n'\h'|\\n:u'\*(#]
|
|
.ds d- \h'\*(#H'\(pd\h'-\w'~'u'\v'-.25m'\f2\(hy\fP\v'.25m'\h'-\*(#H'
|
|
.ds D- D\\k:\h'-\w'D'u'\v'-.11m'\z\(hy\v'.11m'\h'|\\n:u'
|
|
.ds th \*(#[\v'.3m'\s+1I\s-1\v'-.3m'\h'-(\w'I'u*2/3)'\s-1o\s+1\*(#]
|
|
.ds Th \*(#[\s+2I\s-2\h'-\w'I'u*3/5'\v'-.3m'o\v'.3m'\*(#]
|
|
.ds ae a\h'-(\w'a'u*4/10)'e
|
|
.ds Ae A\h'-(\w'A'u*4/10)'E
|
|
. \" corrections for vroff
|
|
.if v .ds ~ \\k:\h'-(\\n(.wu*9/10-\*(#H)'\s-2\u~\d\s+2\h'|\\n:u'
|
|
.if v .ds ^ \\k:\h'-(\\n(.wu*10/11-\*(#H)'\v'-.4m'^\v'.4m'\h'|\\n:u'
|
|
. \" for low resolution devices (crt and lpr)
|
|
.if \n(.H>23 .if \n(.V>19 \
|
|
\{\
|
|
. ds : e
|
|
. ds 8 ss
|
|
. ds o a
|
|
. ds d- d\h'-1'\(ga
|
|
. ds D- D\h'-1'\(hy
|
|
. ds th \o'bp'
|
|
. ds Th \o'LP'
|
|
. ds ae ae
|
|
. ds Ae AE
|
|
.\}
|
|
.rm #[ #] #H #V #F C
|
|
.\" ========================================================================
|
|
.\"
|
|
.IX Title "BIO_s_file 3"
|
|
.TH BIO_s_file 3 "2001-04-12" "0.9.7g" "OpenSSL"
|
|
.SH "NAME"
|
|
BIO_s_file, BIO_new_file, BIO_new_fp, BIO_set_fp, BIO_get_fp,
|
|
BIO_read_filename, BIO_write_filename, BIO_append_filename,
|
|
BIO_rw_filename \- FILE bio
|
|
.SH "LIBRARY"
|
|
libcrypto, -lcrypto
|
|
.SH "SYNOPSIS"
|
|
.IX Header "SYNOPSIS"
|
|
.Vb 1
|
|
\& #include <openssl/bio.h>
|
|
.Ve
|
|
.PP
|
|
.Vb 3
|
|
\& BIO_METHOD * BIO_s_file(void);
|
|
\& BIO *BIO_new_file(const char *filename, const char *mode);
|
|
\& BIO *BIO_new_fp(FILE *stream, int flags);
|
|
.Ve
|
|
.PP
|
|
.Vb 2
|
|
\& BIO_set_fp(BIO *b,FILE *fp, int flags);
|
|
\& BIO_get_fp(BIO *b,FILE **fpp);
|
|
.Ve
|
|
.PP
|
|
.Vb 4
|
|
\& int BIO_read_filename(BIO *b, char *name)
|
|
\& int BIO_write_filename(BIO *b, char *name)
|
|
\& int BIO_append_filename(BIO *b, char *name)
|
|
\& int BIO_rw_filename(BIO *b, char *name)
|
|
.Ve
|
|
.SH "DESCRIPTION"
|
|
.IX Header "DESCRIPTION"
|
|
\&\fIBIO_s_file()\fR returns the \s-1BIO\s0 file method. As its name implies it
|
|
is a wrapper round the stdio \s-1FILE\s0 structure and it is a
|
|
source/sink \s-1BIO\s0.
|
|
.PP
|
|
Calls to \fIBIO_read()\fR and \fIBIO_write()\fR read and write data to the
|
|
underlying stream. \fIBIO_gets()\fR and \fIBIO_puts()\fR are supported on file BIOs.
|
|
.PP
|
|
\&\fIBIO_flush()\fR on a file \s-1BIO\s0 calls the \fIfflush()\fR function on the wrapped
|
|
stream.
|
|
.PP
|
|
\&\fIBIO_reset()\fR attempts to change the file pointer to the start of file
|
|
using fseek(stream, 0, 0).
|
|
.PP
|
|
\&\fIBIO_seek()\fR sets the file pointer to position \fBofs\fR from start of file
|
|
using fseek(stream, ofs, 0).
|
|
.PP
|
|
\&\fIBIO_eof()\fR calls \fIfeof()\fR.
|
|
.PP
|
|
Setting the \s-1BIO_CLOSE\s0 flag calls \fIfclose()\fR on the stream when the \s-1BIO\s0
|
|
is freed.
|
|
.PP
|
|
\&\fIBIO_new_file()\fR creates a new file \s-1BIO\s0 with mode \fBmode\fR the meaning
|
|
of \fBmode\fR is the same as the stdio function \fIfopen()\fR. The \s-1BIO_CLOSE\s0
|
|
flag is set on the returned \s-1BIO\s0.
|
|
.PP
|
|
\&\fIBIO_new_fp()\fR creates a file \s-1BIO\s0 wrapping \fBstream\fR. Flags can be:
|
|
\&\s-1BIO_CLOSE\s0, \s-1BIO_NOCLOSE\s0 (the close flag) \s-1BIO_FP_TEXT\s0 (sets the underlying
|
|
stream to text mode, default is binary: this only has any effect under
|
|
Win32).
|
|
.PP
|
|
\&\fIBIO_set_fp()\fR set the fp of a file \s-1BIO\s0 to \fBfp\fR. \fBflags\fR has the same
|
|
meaning as in \fIBIO_new_fp()\fR, it is a macro.
|
|
.PP
|
|
\&\fIBIO_get_fp()\fR retrieves the fp of a file \s-1BIO\s0, it is a macro.
|
|
.PP
|
|
\&\fIBIO_seek()\fR is a macro that sets the position pointer to \fBoffset\fR bytes
|
|
from the start of file.
|
|
.PP
|
|
\&\fIBIO_tell()\fR returns the value of the position pointer.
|
|
.PP
|
|
\&\fIBIO_read_filename()\fR, \fIBIO_write_filename()\fR, \fIBIO_append_filename()\fR and
|
|
\&\fIBIO_rw_filename()\fR set the file \s-1BIO\s0 \fBb\fR to use file \fBname\fR for
|
|
reading, writing, append or read write respectively.
|
|
.SH "NOTES"
|
|
.IX Header "NOTES"
|
|
When wrapping stdout, stdin or stderr the underlying stream should not
|
|
normally be closed so the \s-1BIO_NOCLOSE\s0 flag should be set.
|
|
.PP
|
|
Because the file \s-1BIO\s0 calls the underlying stdio functions any quirks
|
|
in stdio behaviour will be mirrored by the corresponding \s-1BIO\s0.
|
|
.SH "EXAMPLES"
|
|
.IX Header "EXAMPLES"
|
|
File \s-1BIO\s0 \*(L"hello world\*(R":
|
|
.PP
|
|
.Vb 3
|
|
\& BIO *bio_out;
|
|
\& bio_out = BIO_new_fp(stdout, BIO_NOCLOSE);
|
|
\& BIO_printf(bio_out, "Hello World\en");
|
|
.Ve
|
|
.PP
|
|
Alternative technique:
|
|
.PP
|
|
.Vb 5
|
|
\& BIO *bio_out;
|
|
\& bio_out = BIO_new(BIO_s_file());
|
|
\& if(bio_out == NULL) /* Error ... */
|
|
\& if(!BIO_set_fp(bio_out, stdout, BIO_NOCLOSE)) /* Error ... */
|
|
\& BIO_printf(bio_out, "Hello World\en");
|
|
.Ve
|
|
.PP
|
|
Write to a file:
|
|
.PP
|
|
.Vb 5
|
|
\& BIO *out;
|
|
\& out = BIO_new_file("filename.txt", "w");
|
|
\& if(!out) /* Error occurred */
|
|
\& BIO_printf(out, "Hello World\en");
|
|
\& BIO_free(out);
|
|
.Ve
|
|
.PP
|
|
Alternative technique:
|
|
.PP
|
|
.Vb 6
|
|
\& BIO *out;
|
|
\& out = BIO_new(BIO_s_file());
|
|
\& if(out == NULL) /* Error ... */
|
|
\& if(!BIO_write_filename(out, "filename.txt")) /* Error ... */
|
|
\& BIO_printf(out, "Hello World\en");
|
|
\& BIO_free(out);
|
|
.Ve
|
|
.SH "RETURN VALUES"
|
|
.IX Header "RETURN VALUES"
|
|
\&\fIBIO_s_file()\fR returns the file \s-1BIO\s0 method.
|
|
.PP
|
|
\&\fIBIO_new_file()\fR and \fIBIO_new_fp()\fR return a file \s-1BIO\s0 or \s-1NULL\s0 if an error
|
|
occurred.
|
|
.PP
|
|
\&\fIBIO_set_fp()\fR and \fIBIO_get_fp()\fR return 1 for success or 0 for failure
|
|
(although the current implementation never return 0).
|
|
.PP
|
|
\&\fIBIO_seek()\fR returns the same value as the underlying \fIfseek()\fR function:
|
|
0 for success or \-1 for failure.
|
|
.PP
|
|
\&\fIBIO_tell()\fR returns the current file position.
|
|
.PP
|
|
\&\fIBIO_read_filename()\fR, \fIBIO_write_filename()\fR, \fIBIO_append_filename()\fR and
|
|
\&\fIBIO_rw_filename()\fR return 1 for success or 0 for failure.
|
|
.SH "BUGS"
|
|
.IX Header "BUGS"
|
|
\&\fIBIO_reset()\fR and \fIBIO_seek()\fR are implemented using \fIfseek()\fR on the underlying
|
|
stream. The return value for \fIfseek()\fR is 0 for success or \-1 if an error
|
|
occurred this differs from other types of \s-1BIO\s0 which will typically return
|
|
1 for success and a non positive value if an error occurred.
|
|
.SH "SEE ALSO"
|
|
.IX Header "SEE ALSO"
|
|
\&\fIBIO_seek\fR\|(3), \fIBIO_tell\fR\|(3),
|
|
\&\fIBIO_reset\fR\|(3), \fIBIO_flush\fR\|(3),
|
|
\&\fIBIO_read\fR\|(3),
|
|
\&\fIBIO_write\fR\|(3), \fIBIO_puts\fR\|(3),
|
|
\&\fIBIO_gets\fR\|(3), \fIBIO_printf\fR\|(3),
|
|
\&\fIBIO_set_close\fR\|(3), \fIBIO_get_close\fR\|(3)
|