BIO_S_FILE - Online Linux Manual PageSection : 3
Updated : 2021-03-26
Source : 1.1.1k
Note : OpenSSL
NAMEBIO_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
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)
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 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 mode the meaning of 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 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 fp. 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 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 to use file name for reading, writing, append or read write respectively.
NOTESWhen 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.
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.
EXAMPLESFile 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);
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.
SEE ALSO​BIO_seek (3), BIO_tell (3), ​BIO_reset (3), BIO_flush (3), ​BIO_read_ex (3), ​BIO_write_ex (3), BIO_puts (3), ​BIO_gets (3), BIO_printf (3), ​BIO_set_close (3), BIO_get_close (3)
COPYRIGHTCopyright 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 <https://www.openssl.org/source/license.html>. 0
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