Name

BIO_s_fd, BIO_set_fd
BIO_get_fd, BIO_new_fd

file descriptor BIO

Library

libcrypto.lib

Synopsis

#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);

Detailed Description

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.

Examples

 BIO *out;
 out = BIO_new_fd(fileno(stdout), BIO_NOCLOSE);
 BIO_printf(out, "Hello World\n");
 BIO_free(out);

Notes

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() and BIO_should_retry() manual pages.

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

Return Values

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.

See Also

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

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