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NAME

       getpeername - get name of connected peer socket

SYNOPSIS

       #include <sys/socket.h>

       int getpeername(int sockfd, struct sockaddr *addr, socklen_t *addrlen);

DESCRIPTION

       getpeername()  returns  the address of the peer connected to the socket
       sockfd, in the buffer pointed to by addr.  The addrlen argument  should
       be  initialized to indicate the amount of space pointed to by addr.  On
       return it contains the actual size of the  name  returned  (in  bytes).
       The name is truncated if the buffer provided is too small.

       The  returned address is truncated if the buffer provided is too small;
       in this case, addrlen will return a value greater than was supplied  to
       the call.

RETURN VALUE

       On  success,  zero is returned.  On error, -1 is returned, and errno is
       set appropriately.

ERRORS

       EBADF  The argument sockfd is not a valid descriptor.

       EFAULT The addr argument points to memory not in a valid  part  of  the
              process address space.

       EINVAL addrlen 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 sockfd is a file, not a socket.

CONFORMING TO

       SVr4,  4.4BSD  (the  getpeername()  function  call  first  appeared  in
       4.2BSD), POSIX.1-2001.

NOTES

       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), ip(7), socket(7), unix(7)

COLOPHON

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       description of the project, and information about reporting  bugs,  can
       be found at http://man7.org/linux/man-pages/.