2431275ac4
with NetBSD and the Single Unix Specification v2. This updates some structures with other, almost equivalent types and effort is under way to get the whole more consistent. Also removes a double definition of INET6 and some other clean-ups. Reviewed by: green, bde, phk Some part obtained from: NetBSD, SUSv2 specification
115 lines
3.5 KiB
Groff
115 lines
3.5 KiB
Groff
.\" Copyright (c) 1983, 1991, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)getpeername.2 8.1 (Berkeley) 6/4/93
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.\" $FreeBSD$
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.\"
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.Dd June 4, 1993
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.Dt GETPEERNAME 2
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.Os BSD 4.2
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.Sh NAME
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.Nm getpeername
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.Nd get name of connected peer
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.Sh SYNOPSIS
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.Fd #include <sys/types.h>
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.Fd #include <sys/socket.h>
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.Ft int
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.Fn getpeername "int s" "struct sockaddr *name" "socklen_t *namelen"
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.Sh DESCRIPTION
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.Fn Getpeername
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returns the name of the peer connected to
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socket
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.Fa s .
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The
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.Fa namelen
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parameter should be initialized to indicate
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the amount of space pointed to by
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.Fa name .
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On return it contains the actual size of the name
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returned (in bytes).
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The name is truncated if the buffer provided is too small.
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.Sh IMPLEMENTATION NOTES
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.Pp
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In the non-threaded library
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.Fn getpeername
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is implemented as the
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.Va getpeername
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syscall.
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.Pp
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In the threaded library, the
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.Va getpeername
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syscall is assembled to
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.Fn _thread_sys_getpeername
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and
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.Fn getpeername
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is implemented as a function which locks
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.Va s
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for read and write, then calls
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.Fn _thread_sys_getpeername .
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Before returning,
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.Fn getpeername
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unlocks
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.Va s .
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.Sh RETURN VALUES
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A 0 is returned if the call succeeds, -1 if it fails.
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.Sh ERRORS
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The call succeeds unless:
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.Bl -tag -width ENOTSOCKAA
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.It Bq Er EBADF
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The argument
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.Fa s
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is not a valid descriptor.
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.It Bq Er ENOTSOCK
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The argument
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.Fa s
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is a file, not a socket.
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.It Bq Er ENOTCONN
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The socket is not connected.
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.It Bq Er ENOBUFS
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Insufficient resources were available in the system
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to perform the operation.
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.It Bq Er EFAULT
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The
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.Fa name
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parameter points to memory not in a valid part of the
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process address space.
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.El
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.Sh SEE ALSO
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.Xr accept 2 ,
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.Xr bind 2 ,
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.Xr getsockname 2 ,
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.Xr socket 2
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.Sh HISTORY
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The
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.Fn getpeername
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function call appeared in
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.Bx 4.2 .
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