GETSOCKNAME(2)                      Linux Programmer's Manual                      GETSOCKNAME(2)



NAME
       getsockname - get socket name

SYNOPSIS
       #include <sys/socket.h>

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

DESCRIPTION
       getsockname() returns the current address to which the socket sockfd is bound, in the buf‐
       fer pointed to by addr.  The addrlen argument should be initialized to indicate the amount
       of  space  (in  bytes)  pointed  to by addr.  On return it contains the actual size of the
       socket address.

       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.

       ENOTSOCK
              The argument sockfd is a file, not a socket.

CONFORMING TO
       SVr4, 4.4BSD (the getsockname() function call appeared in 4.2BSD), POSIX.1-2001.

NOTES
       The third argument of getsockname() 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
       bind(2), socket(2), getifaddrs(3), ip(7), socket(7), unix(7)

COLOPHON
       This page is part of release 3.74 of the Linux man-pages project.  A  description  of  the
       project,  information  about  reporting  bugs, and the latest version of this page, can be
       found at http://www.kernel.org/doc/man-pages/.



Linux                                       2008-12-03                             GETSOCKNAME(2)