NAME    [Toc]    [Back]

       BIO_s_fd,   BIO_set_fd,   BIO_get_fd,  BIO_new_fd  -  File
       descriptor BIO

SYNOPSIS    [Toc]    [Back]

       #include <openssl/bio.h>

       BIO_METHOD *   BIO_s_fd(
               void                  );                   #define
       BIO_set_fd(b,fd,c)    BIO_int_ctrl(b,BIO_C_SET_FD,c,fd)
       #define  BIO_get_fd(b,c)   BIO_ctrl(b,BIO_C_GET_FD,0,(char
       *)c)

       BIO *BIO_new_fd(
               int fd,
               int close_flag );

DESCRIPTION    [Toc]    [Back]

       The  BIO_s_fd()  function  returns the file descriptor BIO
       method. This is  a  wrapper  around  the  platform's  file
       descriptor routines, such as read() and write().

       The BIO_read() and BIO_write() functions read or write the
       underlying  descriptor.   BIO_puts()  is  supported,   but
       BIO_gets() is not.

       If  the  close  flag is set then then close() is called on
       the underlying file descriptor when the BIO is freed.

       The BIO_reset()  function  attempts  to  change  the  file
       pointer to the start of file using lseek(fd, 0, 0).

       The  BIO_seek() function sets the file pointer to position
       ofs from start of file using lseek(fd, ofs, 0).

       The BIO_tell() function returns the current file  position
       by calling lseek(fd, 0, 1).

       The  BIO_set_fd() function sets the file descriptor of BIO
       b to fd and the close flag to c.

       The BIO_get_fd() function places the file descriptor in  c
       if  it  is  not NULL. It also returns the file descriptor.
       If c is not NULL it should be of type (int *).

       The BIO_new_fd() function returns a  file  descriptor  BIO
       using fd and close_flag.

NOTES    [Toc]    [Back]

       The  behavior  of the BIO_read() and BIO_write() functions
       depends on the  behavior  of  the  platform's  read()  and
       write()  calls  on the descriptor. If the underlying  file
       descriptor is in a nonblocking  mode  then  the  BIO  will
       behave in the manner described in the BIO_read(3) and

       BIO_should_retry(3) reference pages.

       File  descriptor  BIOs  should not be used for socket I/O.
       Use socket BIOs instead.

RETURN VALUES    [Toc]    [Back]

       BIO_s_fd() returns the file descriptor BIO method.

       BIO_reset() returns zero for success and -1  if  an  error
       occurred.   BIO_seek()  and  BIO_tell() return the current
       file position or -1 is an  error  occurred.  These  values
       reflect the underlying lseek() behavior.

       BIO_set_fd() always returns 1.

       BIO_get_fd()  returns the file descriptor or -1 if the BIO
       has not been initialized.

       BIO_new_fd() returns the newly allocated BIO or NULL is an
       error occurred.

EXAMPLES    [Toc]    [Back]

       This  is  a  file descriptor BIO version of "Hello World":
       BIO *out; out =  BIO_new_fd(fileno(stdout),  BIO_NOCLOSE);
       BIO_printf(out, "Hello World\n"); BIO_free(out);

SEE ALSO    [Toc]    [Back]

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



                                                      BIO_s_fd(3)