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/*
* Copyright 2006 Serge van den Boom <svdb@stack.nl>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
// This file is part of netmanager_bsd.c, from where it is #included.
// Only used for BSD sockets.
// This file provides a mapping of Sockets to NetDescriptors.
static NetDescriptor *netDescriptors[FD_SETSIZE];
// INV: flags.closed is not set for entries in netDescriptors.
static size_t maxND;
// One past the largest used ND in netDescriptors, as used in
// the first argument of select();
static inline void
NDIndex_init(void) {
size_t i;
size_t numND = sizeof (netDescriptors) / sizeof (netDescriptors[0]);
for (i = 0; i < numND; i++)
netDescriptors[i] = NULL;
}
static inline void
NDIndex_uninit(void) {
// Nothing to do.
}
static inline int
NDIndex_registerNDWithSocket(Socket *sock, NetDescriptor *nd) {
if ((unsigned int) sock->fd >= FD_SETSIZE) {
errno = EMFILE;
return -1;
}
netDescriptors[sock->fd] = nd;
if ((size_t) sock->fd >= maxND)
maxND = (size_t) sock->fd + 1;
return 0;
}
static inline void
NDIndex_unregisterNDForSocket(Socket *sock) {
NetDescriptor **last;
netDescriptors[sock->fd] = NULL;
last = &netDescriptors[sock->fd];
if ((size_t) sock->fd + 1 == maxND) {
do {
maxND--;
if (last == &netDescriptors[0])
break;
last--;
} while (*last == NULL);
}
}
static inline NetDescriptor *
NDIndex_getNDForSocket(Socket *sock) {
assert((size_t) sock->fd < maxND);
return netDescriptors[sock->fd];
}
static inline NetDescriptor *
NDIndex_getNDForSocketFd(int fd) {
assert((size_t) fd < maxND);
return netDescriptors[fd];
}
static inline bool
NDIndex_socketRegistered(Socket *sock) {
return ((size_t) sock->fd < maxND)
&& (NDIndex_getNDForSocket(sock) != NULL);
}
// Get the first argument to be used in select().
static inline size_t
NDIndex_getSelectNumND(void) {
return maxND;
}
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