:-'Generic Commit'
This commit is contained in:
168
dropshell-tool/openssl-1.1.1w/doc/man3/BIO_s_file.pod
Normal file
168
dropshell-tool/openssl-1.1.1w/doc/man3/BIO_s_file.pod
Normal file
@ -0,0 +1,168 @@
|
||||
=pod
|
||||
|
||||
=head1 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
|
||||
|
||||
=head1 SYNOPSIS
|
||||
|
||||
#include <openssl/bio.h>
|
||||
|
||||
const BIO_METHOD *BIO_s_file(void);
|
||||
BIO *BIO_new_file(const char *filename, const char *mode);
|
||||
BIO *BIO_new_fp(FILE *stream, int flags);
|
||||
|
||||
BIO_set_fp(BIO *b, FILE *fp, int flags);
|
||||
BIO_get_fp(BIO *b, FILE **fpp);
|
||||
|
||||
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)
|
||||
|
||||
=head1 DESCRIPTION
|
||||
|
||||
BIO_s_file() returns the BIO file method. As its name implies it
|
||||
is a wrapper round the stdio FILE structure and it is a
|
||||
source/sink BIO.
|
||||
|
||||
Calls to BIO_read_ex() and BIO_write_ex() read and write data to the
|
||||
underlying stream. BIO_gets() and BIO_puts() are supported on file BIOs.
|
||||
|
||||
BIO_flush() on a file BIO calls the fflush() function on the wrapped
|
||||
stream.
|
||||
|
||||
BIO_reset() attempts to change the file pointer to the start of file
|
||||
using fseek(stream, 0, 0).
|
||||
|
||||
BIO_seek() sets the file pointer to position B<ofs> from start of file
|
||||
using fseek(stream, ofs, 0).
|
||||
|
||||
BIO_eof() calls feof().
|
||||
|
||||
Setting the BIO_CLOSE flag calls fclose() on the stream when the BIO
|
||||
is freed.
|
||||
|
||||
BIO_new_file() creates a new file BIO with mode B<mode> the meaning
|
||||
of B<mode> is the same as the stdio function fopen(). The BIO_CLOSE
|
||||
flag is set on the returned BIO.
|
||||
|
||||
BIO_new_fp() creates a file BIO wrapping B<stream>. Flags can be:
|
||||
BIO_CLOSE, BIO_NOCLOSE (the close flag) BIO_FP_TEXT (sets the underlying
|
||||
stream to text mode, default is binary: this only has any effect under
|
||||
Win32).
|
||||
|
||||
BIO_set_fp() sets the fp of a file BIO to B<fp>. B<flags> has the same
|
||||
meaning as in BIO_new_fp(), it is a macro.
|
||||
|
||||
BIO_get_fp() retrieves the fp of a file BIO, it is a macro.
|
||||
|
||||
BIO_seek() is a macro that sets the position pointer to B<offset> bytes
|
||||
from the start of file.
|
||||
|
||||
BIO_tell() returns the value of the position pointer.
|
||||
|
||||
BIO_read_filename(), BIO_write_filename(), BIO_append_filename() and
|
||||
BIO_rw_filename() set the file BIO B<b> to use file B<name> for
|
||||
reading, writing, append or read write respectively.
|
||||
|
||||
=head1 NOTES
|
||||
|
||||
When wrapping stdout, stdin or stderr the underlying stream should not
|
||||
normally be closed so the BIO_NOCLOSE flag should be set.
|
||||
|
||||
Because the file BIO calls the underlying stdio functions any quirks
|
||||
in stdio behaviour will be mirrored by the corresponding BIO.
|
||||
|
||||
On Windows BIO_new_files reserves for the filename argument to be
|
||||
UTF-8 encoded. In other words if you have to make it work in multi-
|
||||
lingual environment, encode filenames in UTF-8.
|
||||
|
||||
=head1 RETURN VALUES
|
||||
|
||||
BIO_s_file() returns the file BIO method.
|
||||
|
||||
BIO_new_file() and BIO_new_fp() return a file BIO or NULL if an error
|
||||
occurred.
|
||||
|
||||
BIO_set_fp() and BIO_get_fp() return 1 for success or 0 for failure
|
||||
(although the current implementation never return 0).
|
||||
|
||||
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.
|
||||
|
||||
BIO_read_filename(), BIO_write_filename(), BIO_append_filename() and
|
||||
BIO_rw_filename() return 1 for success or 0 for failure.
|
||||
|
||||
=head1 EXAMPLES
|
||||
|
||||
File BIO "hello world":
|
||||
|
||||
BIO *bio_out;
|
||||
|
||||
bio_out = BIO_new_fp(stdout, BIO_NOCLOSE);
|
||||
BIO_printf(bio_out, "Hello World\n");
|
||||
|
||||
Alternative technique:
|
||||
|
||||
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\n");
|
||||
|
||||
Write to a file:
|
||||
|
||||
BIO *out;
|
||||
|
||||
out = BIO_new_file("filename.txt", "w");
|
||||
if (!out)
|
||||
/* Error */
|
||||
BIO_printf(out, "Hello World\n");
|
||||
BIO_free(out);
|
||||
|
||||
Alternative technique:
|
||||
|
||||
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\n");
|
||||
BIO_free(out);
|
||||
|
||||
=head1 BUGS
|
||||
|
||||
BIO_reset() and BIO_seek() are implemented using fseek() on the underlying
|
||||
stream. The return value for fseek() is 0 for success or -1 if an error
|
||||
occurred this differs from other types of BIO which will typically return
|
||||
1 for success and a non positive value if an error occurred.
|
||||
|
||||
=head1 SEE ALSO
|
||||
|
||||
L<BIO_seek(3)>, L<BIO_tell(3)>,
|
||||
L<BIO_reset(3)>, L<BIO_flush(3)>,
|
||||
L<BIO_read_ex(3)>,
|
||||
L<BIO_write_ex(3)>, L<BIO_puts(3)>,
|
||||
L<BIO_gets(3)>, L<BIO_printf(3)>,
|
||||
L<BIO_set_close(3)>, L<BIO_get_close(3)>
|
||||
|
||||
=head1 COPYRIGHT
|
||||
|
||||
Copyright 2000-2020 The OpenSSL Project Authors. All Rights Reserved.
|
||||
|
||||
Licensed under the OpenSSL license (the "License"). You may not use
|
||||
this file except in compliance with the License. You can obtain a copy
|
||||
in the file LICENSE in the source distribution or at
|
||||
L<https://www.openssl.org/source/license.html>.
|
||||
|
||||
=cut
|
Reference in New Issue
Block a user