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PROLOG | NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | EXAMPLES | APPLICATION USAGE | RATIONALE | FUTURE DIRECTIONS | SEE ALSO | COPYRIGHT |
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GETPEERNAME(3P) POSIX Programmer's Manual GETPEERNAME(3P)
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.
getpeername — get the name of the peer socket
#include <sys/socket.h>
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.
The address_len argument points to a socklen_t object which on
input specifies the length of the supplied 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 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.
ENOTCONN
The socket is not connected or otherwise has not had the
peer pre-specified.
ENOTSOCK
The socket argument does not refer to a socket.
EOPNOTSUPP
The operation is not supported for the socket protocol.
The getpeername() function may fail if:
ENOBUFS
Insufficient resources were available in the system to
complete the call.
The following sections are informative.
None.
None.
None.
None.
accept(3p), bind(3p), getsockname(3p), socket(3p)
The Base Definitions volume of POSIX.1‐2017, sys_socket.h(0p)
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 .
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 .
IEEE/The Open Group 2017 GETPEERNAME(3P)
Pages that refer to this page: sys_socket.h(0p), getsockname(3p)
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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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