The Open Group Base Specifications Issue 7
IEEE Std 1003.1-2008, 2016 Edition
Copyright © 2001-2016 The IEEE and The Open Group

#### NAME

> getpeername - get the name of the peer socket

#### SYNOPSIS

> ``#include <sys/socket.h>
> int getpeername(int` socket`, struct sockaddr *restrict` address`,
> socklen_t *restrict` address_len`);
> ``

#### DESCRIPTION

> 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.

#### RETURN VALUE

> Upon successful completion, 0 shall be returned. Otherwise, -1 shall be returned and errno set to indicate the error.

#### ERRORS

> 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.

#### EXAMPLES

> None.

#### APPLICATION USAGE

> None.

#### RATIONALE

> None.

#### FUTURE DIRECTIONS

> None.

#### SEE ALSO

> accept, bind, getsockname, socket

> XBD <sys/socket.h>

#### CHANGE HISTORY

> First released in Issue 6. Derived from the XNS, Issue 5.2 specification.

> The restrict keyword is added to the getpeername() prototype for alignment with the ISO/IEC 9899:1999 standard.

#### Issue 7

> POSIX.1-2008, Technical Corrigendum 1, XSH/TC1-2008/0254 [464] is applied.

End of informative text.

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