получить имя однорангового сокета (get the name of the peer socket)
Пролог (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.
Имя (Name)
getpeername — get the name of the peer socket
Синопсис (Synopsis)
#include <sys/socket.h>
int getpeername(int socket, struct sockaddr *restrict address,
socklen_t *restrict address_len);
Описание (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.
Возвращаемое значение (Return value)
Upon successful completion, 0 shall be returned. Otherwise, -1
shall be returned and errno set to indicate the error.
Ошибки (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.
Примеры (Examples)
None.
Использование в приложениях (Application usage)
None.
Обоснование (Rationale)
None.
Будущие направления (Future directions)
None.
Смотри также (See also)
accept(3p), bind(3p), getsockname(3p), socket(3p)
The Base Definitions volume of POSIX.1‐2017, sys_socket.h(0p)
