BIO_s_fd, BIO_set_fd, BIO_get_fd, BIO_new_fd — file descriptor BIO
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);
BIO_s_fd() returns the file descriptor BIO method. This is a wrapper round the platforms file descriptor routines such as read() and write().
BIO_read() and BIO_write() 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.
BIO_reset() attempts to change the file pointer to the start of file using lseek(fd, 0, 0).
BIO_seek() sets the file pointer to position ofs from start of file using lseek(fd, ofs, 0).
BIO_tell() returns the current file position by calling lseek(fd, 0, 1).
BIO_set_fd() sets the file descriptor of BIO b to fd and the close flag to c.
BIO_get_fd() 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 *).
BIO_new_fd() returns a file descriptor BIO using fd and close_flag.
The behaviour of BIO_read() and BIO_write() depends on the behavior of the platforms read() and write() calls on the descriptor. If the underlying file descriptor is in a non blocking mode then the BIO will behave in the manner described in the BIO_read(3) and BIO_should_retry(3) manual pages.
File descriptor BIOs should not be used for socket I/O. Use socket BIOs instead.
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() behaviour.
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.
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);