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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 buffer pointed to by addr.  The addrlen argument should be initialized to indi-
       cate  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 appropri-
       ately.

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 opera-
              tion.

       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 3.22 of the Linux man-pages project.  A description of
       the  project, and information about reporting bugs, can be found at http://www.ker-
       nel.org/doc/man-pages/.



Linux                             2008-12-03                    GETSOCKNAME(2)

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