GETPEERNAME(P) POSIX Programmer's Manual GETPEERNAME(P)
getpeername - get the name of the peer socket
int getpeername(int socket, struct sockaddr *restrict address,
socklen_t *restrict address_len);
The getpeername() function shall retrieve the peer address of the specified socket, store
this address in the sockaddr structure pointed to by the address argument, and store the
length of this address in the object pointed to by the address_len argument.
If the actual length of the address is greater than the length of the supplied sockaddr
structure, the stored address shall be truncated.
If the protocol permits connections by unbound clients, and the peer is not bound, then
the value stored in the object pointed to by address is unspecified.
Upon successful completion, 0 shall be returned. Otherwise, -1 shall be returned and errno
set to indicate the error.
The getpeername() function shall fail if:
EBADF The socket argument is not a valid file descriptor.
EINVAL The socket has been shut down.
The socket is not connected or otherwise has not had the peer pre-specified.
The socket argument does not refer to a socket.
The operation is not supported for the socket protocol.
The getpeername() function may fail if:
Insufficient resources were available in the system to complete the call.
The following sections are informative.
accept() , bind() , getsockname() , socket() , the Base Definitions volume of
IEEE Std 1003.1-2001, <sys/socket.h>
Portions of this text are reprinted and reproduced in electronic form from IEEE Std
1003.1, 2003 Edition, Standard for Information Technology -- Portable Operating System
Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 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 orig-
inal Standard can be obtained online at http://www.opengroup.org/unix/online.html .
IEEE/The Open Group 2003 GETPEERNAME(P)