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HP Open Source Security for OpenVMS Volume 2:... |
CRYPTO Application Programming Interface (API)... |
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| Description Return Values See Also | Notes Example |
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);
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.
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(3) and BIO_should_retry(3) 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.
EXAMPLE 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 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)
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