297 lines
9.3 KiB
Groff
Executable File
297 lines
9.3 KiB
Groff
Executable File
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.\" ========================================================================
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.\"
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.IX Title "BIO_S_FILE 3"
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.TH BIO_S_FILE 3 "2020-03-02" "3.0.0-dev" "OpenSSL"
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.\" For nroff, turn off justification. Always turn off hyphenation; it makes
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.\" way too many mistakes in technical documents.
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.if n .ad l
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.nh
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.SH "NAME"
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BIO_s_file, BIO_new_file, BIO_new_fp, BIO_set_fp, BIO_get_fp,
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BIO_read_filename, BIO_write_filename, BIO_append_filename,
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BIO_rw_filename \- FILE bio
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.SH "SYNOPSIS"
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.IX Header "SYNOPSIS"
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.Vb 1
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\& #include <openssl/bio.h>
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\&
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\& const BIO_METHOD *BIO_s_file(void);
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\& BIO *BIO_new_file(const char *filename, const char *mode);
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\& BIO *BIO_new_fp(FILE *stream, int flags);
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\&
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\& BIO_set_fp(BIO *b, FILE *fp, int flags);
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\& BIO_get_fp(BIO *b, FILE **fpp);
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\&
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\& int BIO_read_filename(BIO *b, char *name)
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\& int BIO_write_filename(BIO *b, char *name)
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\& int BIO_append_filename(BIO *b, char *name)
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\& int BIO_rw_filename(BIO *b, char *name)
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.Ve
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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\&\fIBIO_s_file()\fR returns the \s-1BIO\s0 file method. As its name implies it
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is a wrapper round the stdio \s-1FILE\s0 structure and it is a
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source/sink \s-1BIO\s0.
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.PP
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Calls to \fIBIO_read_ex()\fR and \fIBIO_write_ex()\fR read and write data to the
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underlying stream. \fIBIO_gets()\fR and \fIBIO_puts()\fR are supported on file BIOs.
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.PP
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\&\fIBIO_flush()\fR on a file \s-1BIO\s0 calls the \fIfflush()\fR function on the wrapped
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stream.
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.PP
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\&\fIBIO_reset()\fR attempts to change the file pointer to the start of file
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using fseek(stream, 0, 0).
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.PP
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\&\fIBIO_seek()\fR sets the file pointer to position \fBofs\fR from start of file
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using fseek(stream, ofs, 0).
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.PP
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\&\fIBIO_eof()\fR calls \fIfeof()\fR.
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.PP
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Setting the \s-1BIO_CLOSE\s0 flag calls \fIfclose()\fR on the stream when the \s-1BIO\s0
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is freed.
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.PP
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\&\fIBIO_new_file()\fR creates a new file \s-1BIO\s0 with mode \fBmode\fR the meaning
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of \fBmode\fR is the same as the stdio function \fIfopen()\fR. The \s-1BIO_CLOSE\s0
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flag is set on the returned \s-1BIO\s0.
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.PP
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\&\fIBIO_new_fp()\fR creates a file \s-1BIO\s0 wrapping \fBstream\fR. Flags can be:
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\&\s-1BIO_CLOSE\s0, \s-1BIO_NOCLOSE\s0 (the close flag) \s-1BIO_FP_TEXT\s0 (sets the underlying
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stream to text mode, default is binary: this only has any effect under
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Win32).
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.PP
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\&\fIBIO_set_fp()\fR sets the fp of a file \s-1BIO\s0 to \fBfp\fR. \fBflags\fR has the same
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meaning as in \fIBIO_new_fp()\fR, it is a macro.
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.PP
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\&\fIBIO_get_fp()\fR retrieves the fp of a file \s-1BIO\s0, it is a macro.
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.PP
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\&\fIBIO_seek()\fR is a macro that sets the position pointer to \fBoffset\fR bytes
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from the start of file.
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.PP
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\&\fIBIO_tell()\fR returns the value of the position pointer.
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.PP
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\&\fIBIO_read_filename()\fR, \fIBIO_write_filename()\fR, \fIBIO_append_filename()\fR and
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\&\fIBIO_rw_filename()\fR set the file \s-1BIO\s0 \fBb\fR to use file \fBname\fR for
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reading, writing, append or read write respectively.
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.SH "NOTES"
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.IX Header "NOTES"
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When wrapping stdout, stdin or stderr the underlying stream should not
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normally be closed so the \s-1BIO_NOCLOSE\s0 flag should be set.
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.PP
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Because the file \s-1BIO\s0 calls the underlying stdio functions any quirks
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in stdio behaviour will be mirrored by the corresponding \s-1BIO\s0.
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.PP
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On Windows BIO_new_files reserves for the filename argument to be
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\&\s-1UTF\-8\s0 encoded. In other words if you have to make it work in multi\-
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lingual environment, encode filenames in \s-1UTF\-8\s0.
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.SH "RETURN VALUES"
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.IX Header "RETURN VALUES"
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\&\fIBIO_s_file()\fR returns the file \s-1BIO\s0 method.
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.PP
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\&\fIBIO_new_file()\fR and \fIBIO_new_fp()\fR return a file \s-1BIO\s0 or \s-1NULL\s0 if an error
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occurred.
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.PP
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\&\fIBIO_set_fp()\fR and \fIBIO_get_fp()\fR return 1 for success or 0 for failure
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(although the current implementation never return 0).
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.PP
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\&\fIBIO_seek()\fR returns the same value as the underlying \fIfseek()\fR function:
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0 for success or \-1 for failure.
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.PP
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\&\fIBIO_tell()\fR returns the current file position.
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.PP
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\&\fIBIO_read_filename()\fR, \fIBIO_write_filename()\fR, \fIBIO_append_filename()\fR and
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\&\fIBIO_rw_filename()\fR return 1 for success or 0 for failure.
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.SH "EXAMPLES"
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.IX Header "EXAMPLES"
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File \s-1BIO\s0 \*(L"hello world\*(R":
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.PP
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.Vb 1
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\& BIO *bio_out;
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\&
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\& bio_out = BIO_new_fp(stdout, BIO_NOCLOSE);
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\& BIO_printf(bio_out, "Hello World\en");
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.Ve
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.PP
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Alternative technique:
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.PP
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.Vb 1
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\& BIO *bio_out;
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\&
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\& bio_out = BIO_new(BIO_s_file());
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\& if (bio_out == NULL)
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\& /* Error */
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\& if (!BIO_set_fp(bio_out, stdout, BIO_NOCLOSE))
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\& /* Error */
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\& BIO_printf(bio_out, "Hello World\en");
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.Ve
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.PP
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Write to a file:
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.PP
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.Vb 1
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\& BIO *out;
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\&
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\& out = BIO_new_file("filename.txt", "w");
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\& if (!out)
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\& /* Error */
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\& BIO_printf(out, "Hello World\en");
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\& BIO_free(out);
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.Ve
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.PP
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Alternative technique:
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.PP
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.Vb 1
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\& BIO *out;
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\&
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\& out = BIO_new(BIO_s_file());
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\& if (out == NULL)
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\& /* Error */
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\& if (!BIO_write_filename(out, "filename.txt"))
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\& /* Error */
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\& BIO_printf(out, "Hello World\en");
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\& BIO_free(out);
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.Ve
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.SH "BUGS"
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.IX Header "BUGS"
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\&\fIBIO_reset()\fR and \fIBIO_seek()\fR are implemented using \fIfseek()\fR on the underlying
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stream. The return value for \fIfseek()\fR is 0 for success or \-1 if an error
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occurred this differs from other types of \s-1BIO\s0 which will typically return
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1 for success and a non positive value if an error occurred.
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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\&\fIBIO_seek\fR\|(3), \fIBIO_tell\fR\|(3),
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\&\fIBIO_reset\fR\|(3), \fIBIO_flush\fR\|(3),
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\&\fIBIO_read_ex\fR\|(3),
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\&\fIBIO_write_ex\fR\|(3), \fIBIO_puts\fR\|(3),
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\&\fIBIO_gets\fR\|(3), \fIBIO_printf\fR\|(3),
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\&\fIBIO_set_close\fR\|(3), \fIBIO_get_close\fR\|(3)
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.SH "COPYRIGHT"
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.IX Header "COPYRIGHT"
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Copyright 2000\-2018 The OpenSSL Project Authors. All Rights Reserved.
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.PP
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Licensed under the Apache License 2.0 (the \*(L"License\*(R"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file \s-1LICENSE\s0 in the source distribution or at
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<https://www.openssl.org/source/license.html>.
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