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								=pod
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								=head1 NAME
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								BIO_s_fd, BIO_set_fd, BIO_get_fd, BIO_new_fd - file descriptor BIO
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								=head1 SYNOPSIS
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								 #include <openssl/bio.h>
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								 const BIO_METHOD *BIO_s_fd(void);
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								 int BIO_set_fd(BIO *b, int fd, int c);
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								 int BIO_get_fd(BIO *b, int *c);
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								 BIO *BIO_new_fd(int fd, int close_flag);
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								=head1 DESCRIPTION
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								BIO_s_fd() returns the file descriptor BIO method. This is a wrapper
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								round the platforms file descriptor routines such as read() and write().
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								BIO_read_ex() and BIO_write_ex() read or write the underlying descriptor.
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								BIO_puts() is supported but BIO_gets() is not.
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								If the close flag is set then close() is called on the underlying
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								file descriptor when the BIO is freed.
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								BIO_reset() attempts to change the file pointer to the start of file
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								such as by using B<lseek(fd, 0, 0)>.
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								BIO_seek() sets the file pointer to position B<ofs> from start of file
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								such as by using B<lseek(fd, ofs, 0)>.
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								BIO_tell() returns the current file position such as by calling
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								B<lseek(fd, 0, 1)>.
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								BIO_set_fd() sets the file descriptor of BIO B<b> to B<fd> and the close
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								flag to B<c>.
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								BIO_get_fd() places the file descriptor in B<c> if it is not NULL, it also
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								returns the file descriptor.
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								BIO_new_fd() returns a file descriptor BIO using B<fd> and B<close_flag>.
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								=head1 NOTES
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								The behaviour of BIO_read_ex() and BIO_write_ex() depends on the behavior of the
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								platforms read() and write() calls on the descriptor. If the underlying
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								file descriptor is in a non blocking mode then the BIO will behave in the
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								manner described in the L<BIO_read_ex(3)> and L<BIO_should_retry(3)>
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								manual pages.
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								File descriptor BIOs should not be used for socket I/O. Use socket BIOs
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								instead.
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								BIO_set_fd() and BIO_get_fd() are implemented as macros.
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								=head1 RETURN VALUES
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								BIO_s_fd() returns the file descriptor BIO method.
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								BIO_set_fd() always returns 1.
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								BIO_get_fd() returns the file descriptor or -1 if the BIO has not
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								been initialized.
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								BIO_new_fd() returns the newly allocated BIO or NULL is an error
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								occurred.
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								=head1 EXAMPLES
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								This is a file descriptor BIO version of "Hello World":
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								 BIO *out;
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								 out = BIO_new_fd(fileno(stdout), BIO_NOCLOSE);
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								 BIO_printf(out, "Hello World\n");
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								 BIO_free(out);
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								=head1 SEE ALSO
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											2015-08-18 03:21:33 +08:00
										 
									 
								 
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								L<BIO_seek(3)>, L<BIO_tell(3)>,
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								L<BIO_reset(3)>, L<BIO_read_ex(3)>,
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								L<BIO_write_ex(3)>, L<BIO_puts(3)>,
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								L<BIO_gets(3)>, L<BIO_printf(3)>,
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								L<BIO_set_close(3)>, L<BIO_get_close(3)>
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								=head1 COPYRIGHT
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								Copyright 2000-2016 The OpenSSL Project Authors. All Rights Reserved.
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											2018-12-06 21:04:44 +08:00
										 
									 
								 
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								Licensed under the Apache License 2.0 (the "License").  You may not use
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								this file except in compliance with the License.  You can obtain a copy
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								in the file LICENSE in the source distribution or at
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								L<https://www.openssl.org/source/license.html>.
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								=cut
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