5 BIO_s_fd, BIO_set_fd, BIO_get_fd, BIO_new_fd - file descriptor BIO
9 #include <openssl/bio.h>
11 BIO_METHOD * BIO_s_fd(void);
13 #define BIO_set_fd(b,fd,c) BIO_int_ctrl(b,BIO_C_SET_FD,c,fd)
14 #define BIO_get_fd(b,c) BIO_ctrl(b,BIO_C_GET_FD,0,(char *)c)
16 BIO *BIO_new_fd(int fd, int close_flag);
20 BIO_s_fd() returns the file descriptor BIO method. This is a wrapper
21 round the platforms file descriptor routines such as read() and write().
23 BIO_set_fd() sets the file descriptor of BIO B<b> to B<fd> and the close
26 BIO_get_fd() places the file descriptor in B<c> if it is not NULL, it also
27 returns the file descriptor. If B<c> is not NULL it should be of type
30 BIO_new_fd() returns a file descriptor BIO using B<fd> and B<close_flag>.
34 If the close flag is set then then close() is called on the underlying
35 file descriptor when the BIO is freed.
37 BIO_reset() attempts to change the file pointer to the start of file
38 using lseek(fd, 0, 0).
40 BIO_read() and BIO_write() read or write the underlying descriptor.
41 BIO_puts() is supported but BIO_gets() is not.
43 The behaviour of BIO_read() and BIO_write() depends on the behavior of the
44 platforms read() and write() calls on the descriptor. If the underlying
45 file descriptor is in a non blocking mode then the BIO will behave in the
46 manner described in the L<BIO_read(3)|BIO_read(3)> and L<BIO_should_retry(3)|BIO_should_retry(3)>
49 File descriptor BIOs should not be used for socket I/O. Use socket BIOs
54 BIO_s_fd() returns the file descriptor BIO method.
56 BIO_set_fd() always returns 1.
58 BIO_get_fd() returns the file descriptor or -1 if the BIO has not
61 BIO_new_fd() returns the newly allocated BIO or NULL is an error
66 This is a file descriptor BIO version of "Hello World":
69 out = BIO_new_fd(fileno(stdout), BIO_NOCLOSE);
70 BIO_printf(out, "Hello World\n");
75 L<BIO_seek(3)|BIO_seek(3)>, L<BIO_tell(3)|BIO_tell(3)>,
76 L<BIO_reset(3)|BIO_reset(3)>, L<BIO_read(3)|BIO_read(3)>,
77 L<BIO_write(3)|BIO_write(3)>, L<BIO_puts(3)|BIO_puts(3)>,
78 L<BIO_gets(3)|BIO_gets(3)>, L<BIO_printf(3)|BIO_printf(3)>,
79 L<BIO_set_close(3)|BIO_set_close(3)>, L<BIO_get_close(3)|BIO_get_close(3)>