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NAME

       bind - bind a name to a socket

SYNOPSIS

       #include <sys/types.h>
       #include <sys/socket.h>

       int   bind(int   sockfd,  const  struct  sockaddr  *my_addr,  socklen_t
       addrlen);

DESCRIPTION

       bind() gives the socket sockfd the local address my_addr.   my_addr  is
       addrlen bytes long.  Traditionally, this is called “assigning a name to
       a socket.”  When a socket is created with socket(2),  it  exists  in  a
       name space (address family) but has no name assigned.

       It  is normally necessary to assign a local address using bind() before
       a SOCK_STREAM socket may receive connections (see accept(2)).

       The rules used in name binding vary between address families.   Consult
       the  manual entries in Section 7 for detailed information.  For AF_INET
       see ip(7), for AF_UNIX see unix(7), for AF_APPLETALK  see  ddp(7),  for
       AF_PACKET  see  packet(7), for AF_X25 see x25(7) and for AF_NETLINK see
       netlink(7).

RETURN VALUE

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

ERRORS

       EACCES The address is protected, and the user is not the superuser.

       EBADF  sockfd is not a valid descriptor.

       EINVAL The  socket  is already bound to an address.  This may change in
              the future: see linux/unix/sock.c for details.

       ENOTSOCK
              Argument is a descriptor for a file, not a socket.

       The following errors are specific to UNIX domain (AF_UNIX) sockets:

       EACCES Search permission is denied on a component of the  path  prefix.
              (See also path_resolution(2).)

       EFAULT my_addr points outside the user’s accessible address space.

       EINVAL The  addrlen  is  wrong,  or  the  socket was not in the AF_UNIX
              family.

       ELOOP  Too many symbolic links were encountered in resolving my_addr.

       ENAMETOOLONG
              my_addr is too long.

       ENOENT The file does not exist.

       ENOMEM Insufficient kernel memory was available.

       ENOTDIR
              A component of the path prefix is not a directory.

       EROFS  The socket inode would reside on a read-only file system.

BUGS

       The transparent proxy options are not described.

CONFORMING TO

       SVr4, 4.4BSD (the bind() function  first  appeared  in  4.2BSD).   SVr4
       documents additional EADDRNOTAVAIL, EADDRINUSE, and ENOSR general error
       conditions, and additional EIO and EISDIR Unix-domain error conditions.

NOTE

       The third argument of bind() 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),  connect(2),  getsockname(2), listen(2), path_resolution(2),
       socket(2), getaddrinfo(3), ip(7), socket(7)