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GETPEERNAME(2) Linux Programmer's Manual GETPEERNAME(2)
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 appropri-
ately.
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 opera-
tion.
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).
SEE ALSO
accept(2), bind(2), getsockname(2)
BSD Man Page 1993-07-30 GETPEERNAME(2)
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