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getpeername() - Unix, Linux System Call
getpeername - get name of connected peer socket
int getpeername(int s, struct sockaddr *name, socklen_t *namelen);
getpeername() returns the name of the peer connected to socket
namelen parameter should be initialized to indicate the amount of space pointed to
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.
On success, zero is returned. On error, -1 is returned, and
errno is set appropriately.
s is not a valid descriptor.
name parameter points to memory not in a valid part of the
process address space.
namelen is invalid (e.g., is negative).
Insufficient resources were available in the system
to perform the operation.
The socket is not connected.
s is a file, not a socket.
SVr4, 4.4BSD (the
getpeername() function call first appeared in 4.2BSD), POSIX.1-2001.
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.