NAME

getpeername − get address of connected peer

SYNOPSIS

#include <sys/socket.h>

AF_CCITT only:

#include <x25/x25addrstr.h>

int getpeername(int s, void ∗addr, int ∗addrlen);

DESCRIPTION

getpeername() returns the address of the peer socket connected to the socket indicated by s, where s is a socket descriptor.  addr points to a socket address structure in which this address is returned.  addrlen points to an object of type int, which should be initialized to indicate the size of the address structure.  On return, it contains the actual size of the address returned (in bytes).  If addr does not point to enough space to contain the whole address of the peer, only the first addrlen bytes of the address are returned. 

AF_CCITT only:

The addr struct contains the X.25 addressing information of the remote peer socket connected to socket s. However, the x25ifname[] field of the addr struct contains the name of the local X.25 interface through which the call arrived. 

RETURN VALUE

Upon successful completion, getpeername() returns 0; otherwise it returns −1 and sets errno to indicate the error. 

ERRORS

getpeername() fails if any of the following conditions are encountered:

[EBADF] The argument s is not a valid file descriptor. 

[ENOTSOCK] The argument s is a file, not a socket. 

[ENOTCONN] The socket is not connected. 

[ENOBUFS] Insufficient resources were available in the system to perform the operation. 

[EFAULT] The addr or addrlen parameters are not valid pointers. 

[EINVAL] The socket has been shut down. 

[EOPNOTSUPP] Operation not supported for AF_UNIX sockets. 

AUTHOR

getpeername() was developed by the University of California, Berkeley. 

SEE ALSO

bind(2), socket(2), getsockname(2), inet(7F), af_ccitt(7F). 

Hewlett-Packard Company  —  HP-UX Release 9.0: August 1992