getpeername()是一個函式。獲取與套接口相連的端地址。
基本介紹
簡述,注釋,
簡述
獲取與套接口相連的端地址。
#include <winsock.h>
int PASCAL FAR getpeername( SOCKET s, struct sockaddr FAR* name,
int FAR* namelen);
s：標識一已連線套接口的描述字。
name：接收端地址的名字結構。
namelen：返回名字結構的長度。
注釋
返回值：
若無錯誤發生，getpeername()返回零。否則的話，返回SOCKET_ERROR，應用程式可通過WSAGetLastError()來獲取相應的錯誤代碼。
錯誤代碼：
WSANOTINITIALISED：在使用此API之前應首先成功地調用WSAStartup()。
WSAENETDOWN：WINDOWS套接口實現檢測到網路子系統失效。
WSAEFAULT：namelen參數不夠大。
WSAEINPROGRESS：一個阻塞的WINDOWS套接口調用正在運行中。
WSAENOTCONN 套接口未連線。
WSAENOTSOCK：描述字不是一個套接口。
參見：
bind(), socket(), getsockname().
Linux system
Name
getpeername - get name of connected peer socket
Synopsis
#include <sys/socket.h>
int getpeername(int s, struct sockaddr *name, socklen_t *namelen);
Description
getpeername() returns the name of the peer connected to socket s. The namelen parameter should be initialized to indicate the amount of space pointed to by name. On return it contains the actual size of the name returned (in bytes). The name is truncated if the buffer provided is too small.
Return Value
On success, zero is returned. On error, -1 is returned, and errno is set appropriately.
Errors
EBADF
The argument s is not a valid descriptor.
EFAULT
The name parameter points to memory not in a valid part of the process address space.
EINVAL
namelen is invalid (e.g., is negative).
ENOBUFS
Insufficient resources were available in the system to perform the operation.
ENOTCONN
The socket is not connected.
ENOTSOCK
The argument s is a file, not a socket.
Conforming to
SVr4, 4.4BSD (the getpeername() function call first appeared in 4.2BSD), POSIX.1-2001.
Note
The third argument of getpeername() is in reality an int * (and this is what 4.x BSD and libc4 and libc5 have). Some POSIX confusion resulted in the present socklen_t, also used by glibc. See also accept(2).
