mirror of
https://github.com/openssl/openssl.git
synced 2024-12-09 05:51:54 +08:00
4746f25ac6
[skip ci] Reviewed-by: Matt Caswell <matt@openssl.org> (Merged from https://github.com/openssl/openssl/pull/7829)
99 lines
2.6 KiB
Plaintext
99 lines
2.6 KiB
Plaintext
=pod
|
|
|
|
=head1 NAME
|
|
|
|
BIO_s_fd, BIO_set_fd, BIO_get_fd, BIO_new_fd - file descriptor BIO
|
|
|
|
=head1 SYNOPSIS
|
|
|
|
#include <openssl/bio.h>
|
|
|
|
const BIO_METHOD *BIO_s_fd(void);
|
|
|
|
int BIO_set_fd(BIO *b, int fd, int c);
|
|
int BIO_get_fd(BIO *b, int *c);
|
|
|
|
BIO *BIO_new_fd(int fd, int close_flag);
|
|
|
|
=head1 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_ex() and BIO_write_ex() read or write the underlying descriptor.
|
|
BIO_puts() is supported but BIO_gets() is not.
|
|
|
|
If the close flag is set 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
|
|
such as by using B<lseek(fd, 0, 0)>.
|
|
|
|
BIO_seek() sets the file pointer to position B<ofs> from start of file
|
|
such as by using B<lseek(fd, ofs, 0)>.
|
|
|
|
BIO_tell() returns the current file position such as by calling
|
|
B<lseek(fd, 0, 1)>.
|
|
|
|
BIO_set_fd() sets the file descriptor of BIO B<b> to B<fd> and the close
|
|
flag to B<c>.
|
|
|
|
BIO_get_fd() places the file descriptor in B<c> if it is not NULL, it also
|
|
returns the file descriptor.
|
|
|
|
BIO_new_fd() returns a file descriptor BIO using B<fd> and B<close_flag>.
|
|
|
|
=head1 NOTES
|
|
|
|
The behaviour of BIO_read_ex() and BIO_write_ex() 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 L<BIO_read_ex(3)> and L<BIO_should_retry(3)>
|
|
manual pages.
|
|
|
|
File descriptor BIOs should not be used for socket I/O. Use socket BIOs
|
|
instead.
|
|
|
|
BIO_set_fd() and BIO_get_fd() are implemented as macros.
|
|
|
|
=head1 RETURN VALUES
|
|
|
|
BIO_s_fd() returns the file descriptor BIO method.
|
|
|
|
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.
|
|
|
|
=head1 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);
|
|
|
|
=head1 SEE ALSO
|
|
|
|
L<BIO_seek(3)>, L<BIO_tell(3)>,
|
|
L<BIO_reset(3)>, L<BIO_read_ex(3)>,
|
|
L<BIO_write_ex(3)>, L<BIO_puts(3)>,
|
|
L<BIO_gets(3)>, L<BIO_printf(3)>,
|
|
L<BIO_set_close(3)>, L<BIO_get_close(3)>
|
|
|
|
=head1 COPYRIGHT
|
|
|
|
Copyright 2000-2016 The OpenSSL Project Authors. All Rights Reserved.
|
|
|
|
Licensed under the Apache License 2.0 (the "License"). You may not use
|
|
this file except in compliance with the License. You can obtain a copy
|
|
in the file LICENSE in the source distribution or at
|
|
L<https://www.openssl.org/source/license.html>.
|
|
|
|
=cut
|