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.\" ========================================================================
.\"
.IX Title "BIO_s_socket 3"
.TH BIO_s_socket 3 "2019-12-20" "1.0.2u" "OpenSSL"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
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.nh
.SH "NAME"
BIO_s_socket, BIO_new_socket \- socket BIO
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #include <openssl/bio.h>
\&
\& BIO_METHOD *BIO_s_socket(void);
\&
\& long BIO_set_fd(BIO *b, int fd, long close_flag);
\& long BIO_get_fd(BIO *b, int *c);
\&
\& BIO *BIO_new_socket(int sock, int close_flag);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\fBBIO_s_socket()\fR returns the socket \s-1BIO\s0 method. This is a wrapper
round the platform's socket routines.
.PP
\&\fBBIO_read()\fR and \fBBIO_write()\fR read or write the underlying socket.
\&\fBBIO_puts()\fR is supported but \fBBIO_gets()\fR is not.
.PP
If the close flag is set then the socket is shut down and closed
when the \s-1BIO\s0 is freed.
.PP
\&\fBBIO_set_fd()\fR sets the socket of \s-1BIO\s0 \fBb\fR to \fBfd\fR and the close
flag to \fBclose_flag\fR.
.PP
\&\fBBIO_get_fd()\fR places the socket in \fBc\fR if it is not \s-1NULL,\s0 it also
returns the socket. If \fBc\fR is not \s-1NULL\s0 it should be of type (int *).
.PP
\&\fBBIO_new_socket()\fR returns a socket \s-1BIO\s0 using \fBsock\fR and \fBclose_flag\fR.
.SH "NOTES"
.IX Header "NOTES"
Socket BIOs also support any relevant functionality of file descriptor
BIOs.
.PP
The reason for having separate file descriptor and socket BIOs is that on some
platforms sockets are not file descriptors and use distinct I/O routines,
Windows is one such platform. Any code mixing the two will not work on
all platforms.
.PP
\&\fBBIO_set_fd()\fR and \fBBIO_get_fd()\fR are macros.
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
\&\fBBIO_s_socket()\fR returns the socket \s-1BIO\s0 method.
.PP
\&\fBBIO_set_fd()\fR always returns 1.
.PP
\&\fBBIO_get_fd()\fR returns the socket or \-1 if the \s-1BIO\s0 has not been
initialized.
.PP
\&\fBBIO_new_socket()\fR returns the newly allocated \s-1BIO\s0 or \s-1NULL\s0 is an error
occurred.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\s-1TBA\s0