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+'\" et
+.TH GETPEERNAME "3P" 2017 "IEEE/The Open Group" "POSIX Programmer's Manual"
+.\"
+.SH PROLOG
+This manual page is part of the POSIX Programmer's Manual.
+The Linux implementation of this interface may differ (consult
+the corresponding Linux manual page for details of Linux behavior),
+or the interface may not be implemented on Linux.
+.\"
+.SH NAME
+getpeername
+\(em get the name of the peer socket
+.SH SYNOPSIS
+.LP
+.nf
+#include <sys/socket.h>
+.P
+int getpeername(int \fIsocket\fP, struct sockaddr *restrict \fIaddress\fP,
+    socklen_t *restrict \fIaddress_len\fP);
+.fi
+.SH DESCRIPTION
+The
+\fIgetpeername\fR()
+function shall retrieve the peer address of the specified socket,
+store this address in the
+.BR sockaddr
+structure pointed to by the
+.IR address
+argument, and store the length of this address in the object pointed
+to by the
+.IR address_len
+argument.
+.P
+The
+.IR address_len
+argument points to a
+.BR socklen_t
+object which on input specifies the length of the supplied
+.BR sockaddr
+structure, and on output specifies the length of the stored address.
+If the actual length of the address is greater than the length of the
+supplied
+.BR sockaddr
+structure, the stored address shall be truncated.
+.P
+If the protocol permits connections by unbound clients, and the peer is
+not bound, then the value stored in the object pointed to by
+.IR address
+is unspecified.
+.SH "RETURN VALUE"
+Upon successful completion, 0 shall be returned. Otherwise, \-1 shall
+be returned and
+.IR errno
+set to indicate the error.
+.SH ERRORS
+The
+\fIgetpeername\fR()
+function shall fail if:
+.TP
+.BR EBADF
+The
+.IR socket
+argument is not a valid file descriptor.
+.TP
+.BR EINVAL
+The socket has been shut down.
+.TP
+.BR ENOTCONN
+The socket is not connected or otherwise has not had the peer
+pre-specified.
+.TP
+.BR ENOTSOCK
+The
+.IR socket
+argument does not refer to a socket.
+.TP
+.BR EOPNOTSUPP
+The operation is not supported for the socket protocol.
+.P
+The
+\fIgetpeername\fR()
+function may fail if:
+.TP
+.BR ENOBUFS
+Insufficient resources were available in the system to complete the
+call.
+.LP
+.IR "The following sections are informative."
+.SH "EXAMPLES"
+None.
+.SH "APPLICATION USAGE"
+None.
+.SH "RATIONALE"
+None.
+.SH "FUTURE DIRECTIONS"
+None.
+.SH "SEE ALSO"
+.IR "\fIaccept\fR\^(\|)",
+.IR "\fIbind\fR\^(\|)",
+.IR "\fIgetsockname\fR\^(\|)",
+.IR "\fIsocket\fR\^(\|)"
+.P
+The Base Definitions volume of POSIX.1\(hy2017,
+.IR "\fB<sys_socket.h>\fP"
+.br
+.\"
+.SH COPYRIGHT
+Portions of this text are reprinted and reproduced in electronic form
+from IEEE Std 1003.1-2017, Standard for Information Technology
+-- Portable Operating System Interface (POSIX), The Open Group Base
+Specifications Issue 7, 2018 Edition,
+Copyright (C) 2018 by the Institute of
+Electrical and Electronics Engineers, Inc and The Open Group.
+In the event of any discrepancy between this version and the original IEEE and
+The Open Group Standard, the original IEEE and The Open Group Standard
+is the referee document. The original Standard can be obtained online at
+http://www.opengroup.org/unix/online.html .
+.PP
+Any typographical or formatting errors that appear
+in this page are most likely
+to have been introduced during the conversion of the source files to
+man page format. To report such errors, see
+https://www.kernel.org/doc/man-pages/reporting_bugs.html .