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BIO_set_fd.3
.\" Automatically generated by Pod::Man 4.11 (Pod::Simple 3.35) .\" .\" Standard preamble: .\" ======================================================================== .de Sp \" Vertical space (when we can't use .PP) .if t .sp .5v .if n .sp .. .de Vb \" Begin verbatim text .ft CW .nf .ne \\$1 .. .de Ve \" End verbatim text .ft R .fi .. .\" Set up some character translations and predefined strings. \*(-- will .\" give an unbreakable dash, \*(PI will give pi, \*(L" will give a left .\" double quote, and \*(R" will give a right double quote. \*(C+ will .\" give a nicer C++. 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Always turn off hyphenation; it makes .\" way too many mistakes in technical documents. .if n .ad l .nh .SH "NAME" BIO_s_fd, BIO_set_fd, BIO_get_fd, BIO_new_fd \- file descriptor BIO .SH "SYNOPSIS" .IX Header "SYNOPSIS" .Vb 1 \& #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); .Ve .SH "DESCRIPTION" .IX Header "DESCRIPTION" \&\fBBIO_s_fd()\fR returns the file descriptor \s-1BIO\s0 method. This is a wrapper round the platforms file descriptor routines such as \fBread()\fR and \fBwrite()\fR. .PP \&\fBBIO_read_ex()\fR and \fBBIO_write_ex()\fR read or write the underlying descriptor. \&\fBBIO_puts()\fR is supported but \fBBIO_gets()\fR is not. .PP If the close flag is set then \fBclose()\fR is called on the underlying file descriptor when the \s-1BIO\s0 is freed. .PP \&\fBBIO_reset()\fR attempts to change the file pointer to the start of file such as by using \fBlseek(fd, 0, 0)\fR. .PP \&\fBBIO_seek()\fR sets the file pointer to position \fBofs\fR from start of file such as by using \fBlseek(fd, ofs, 0)\fR. .PP \&\fBBIO_tell()\fR returns the current file position such as by calling \&\fBlseek(fd, 0, 1)\fR. .PP \&\fBBIO_set_fd()\fR sets the file descriptor of \s-1BIO\s0 \fBb\fR to \fBfd\fR and the close flag to \fBc\fR. .PP \&\fBBIO_get_fd()\fR places the file descriptor in \fBc\fR if it is not \s-1NULL,\s0 it also returns the file descriptor. .PP \&\fBBIO_new_fd()\fR returns a file descriptor \s-1BIO\s0 using \fBfd\fR and \fBclose_flag\fR. .SH "NOTES" .IX Header "NOTES" The behaviour of \fBBIO_read_ex()\fR and \fBBIO_write_ex()\fR depends on the behavior of the platforms \fBread()\fR and \fBwrite()\fR calls on the descriptor. If the underlying file descriptor is in a non blocking mode then the \s-1BIO\s0 will behave in the manner described in the \fBBIO_read_ex\fR\|(3) and \fBBIO_should_retry\fR\|(3) manual pages. .PP File descriptor BIOs should not be used for socket I/O. Use socket BIOs instead. .PP \&\fBBIO_set_fd()\fR and \fBBIO_get_fd()\fR are implemented as macros. .SH "RETURN VALUES" .IX Header "RETURN VALUES" \&\fBBIO_s_fd()\fR returns the file descriptor \s-1BIO\s0 method. .PP \&\fBBIO_set_fd()\fR always returns 1. .PP \&\fBBIO_get_fd()\fR returns the file descriptor or \-1 if the \s-1BIO\s0 has not been initialized. .PP \&\fBBIO_new_fd()\fR returns the newly allocated \s-1BIO\s0 or \s-1NULL\s0 is an error occurred. .SH "EXAMPLES" .IX Header "EXAMPLES" This is a file descriptor \s-1BIO\s0 version of \*(L"Hello World\*(R": .PP .Vb 1 \& BIO *out; \& \& out = BIO_new_fd(fileno(stdout), BIO_NOCLOSE); \& BIO_printf(out, "Hello World\en"); \& BIO_free(out); .Ve .SH "SEE ALSO" .IX Header "SEE ALSO" \&\fBBIO_seek\fR\|(3), \fBBIO_tell\fR\|(3), \&\fBBIO_reset\fR\|(3), \fBBIO_read_ex\fR\|(3), \&\fBBIO_write_ex\fR\|(3), \fBBIO_puts\fR\|(3), \&\fBBIO_gets\fR\|(3), \fBBIO_printf\fR\|(3), \&\fBBIO_set_close\fR\|(3), \fBBIO_get_close\fR\|(3) .SH "COPYRIGHT" .IX Header "COPYRIGHT" Copyright 2000\-2019 The OpenSSL Project Authors. All Rights Reserved. .PP Licensed under the OpenSSL license (the \*(L"License\*(R"). You may not use this file except in compliance with the License. You can obtain a copy in the file \s-1LICENSE\s0 in the source distribution or at <https://www.openssl.org/source/license.html>.
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