GETPEERNAMESection: Linux Programmer's Manual (2)
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NAMEgetpeername - get name of connected peer socket
DESCRIPTIONgetpeername() 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 VALUEOn success, zero is returned. On error, -1 is returned, and errno is set appropriately.
- The argument s is not a valid descriptor.
- The 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.
- The argument s is a file, not a socket.
CONFORMING TOSVr4, 4.4BSD (the getpeername() function call first appeared in 4.2BSD), POSIX.1-2001.
NOTESThe 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 ALSOaccept(2), bind(2), getsockname(2)