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  man pages->Tru64 Unix man pages -> BIO_rw_filename (3)              



NAME    [Toc]    [Back]

       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

SYNOPSIS    [Toc]    [Back]

       #include <openssl/bio.h>

       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    [Toc]    [Back]

       The BIO_s_file() function 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() and BIO_write() 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

       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.

NOTES    [Toc]    [Back]

       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 behavior will be mirrored by the corresponding

RESTRICTIONS    [Toc]    [Back]

       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 nonpositive value if an error occurred.

RETURN VALUES    [Toc]    [Back]

       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
       returns 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.

EXAMPLES    [Toc]    [Back]

       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   occurred   */
       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);

SEE ALSO    [Toc]    [Back]

       Functions:   BIO_seek(3),    BIO_tell(3),    BIO_reset(3),
       BIO_flush(3),   BIO_read(3),   BIO_write(3),  BIO_puts(3),
       BIO_gets(3),       BIO_printf(3),        BIO_set_close(3),

[ Back ]
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