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# bind

    BIND(2)                       System Calls Manual                      BIND(2)

    NAME
         bind - bind a name to a socket

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

         int
         bind(int s, const struct sockaddr *name, socklen_t namelen);

    DESCRIPTION
         bind() assigns a name to an unnamed socket.  When a socket is created
         with socket(2) it exists in a name space (address family) but has no name
         assigned.  bind() requests that name be assigned to the socket.

    NOTES
         Binding a name in the UNIX domain creates a socket in the file system
         that must be deleted by the caller when it is no longer needed (using
         unlink(2)).

         The rules used in name binding vary between communication domains.  Con-
         sult the manual entries in section 4 for detailed information.

    RETURN VALUES
         If the bind is successful, a 0 value is returned.  A return value of -1
         indicates an error, which is further specified in the global errno.

    ERRORS
         The bind() call will fail if:

         [EBADF]            S is not a valid descriptor.

         [ENOTSOCK]         S is not a socket.

         [EADDRNOTAVAIL]    The specified address is not available from the local
                            machine.

         [EADDRINUSE]       The specified address is already in use.

         [EINVAL]           The socket is already bound to an address.

         [EINVAL]           The family of the socket and that requested in
                            name->sa_family are not equivalent.

         [EACCES]           The requested address is protected, and the current
                            user has inadequate permission to access it.

         [EFAULT]           The name parameter is not in a valid part of the user
                            address space.

         The following errors are specific to binding names in the UNIX domain.

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

         [ENAMETOOLONG]     A component of a pathname exceeded {NAME_MAX} charac-
                            ters, or an entire path name exceeded {PATH_MAX} char-
                            acters.

         [ENOENT]           A prefix component of the path name does not exist.

         [ELOOP]            Too many symbolic links were encountered in translat-
                            ing the pathname.

         [EIO]              An I/O error occurred while making the directory entry
                            or allocating the inode.

         [EROFS]            The name would reside on a read-only file system.

         [EISDIR]           An empty pathname was specified.

    SEE ALSO
         connect(2), getsockname(2), listen(2), socket(2)

    HISTORY
         The bind() function call appeared in 4.2BSD.

    BSD                            February 15, 1999                           BSD

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