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/* select.c, liboop, copyright 1999 Dan Egnor
This is free software; you can redistribute it and/or modify it under the
terms of the GNU Lesser General Public License, version 2.1 or later.
See the file COPYING for details. */
#include "oop.h"
#include <assert.h>
#ifdef HAVE_STRING_H
# include <string.h> /* Needed on NetBSD1.1/SPARC due to bzero/FD_ZERO. */
#endif
#ifdef HAVE_STRINGS_H
# include <strings.h> /* Needed on AIX 4.2 due to bzero/FD_ZERO. */
#endif
struct select_set {
fd_set rfd,wfd,xfd;
};
struct oop_adapter_select {
oop_source *source;
struct select_set watch,active;
struct timeval timeout;
int num_fd,do_timeout,is_active,num_fd_active;
oop_call_select *call;
void *data;
};
static oop_call_fd on_fd;
static oop_call_time on_timeout,on_collect;
oop_adapter_select *oop_select_new(
oop_source *source,
oop_call_select *call,void *data)
{
oop_adapter_select *s = oop_malloc(sizeof(*s));
if (NULL == s) return s;
s->source = source;
FD_ZERO(&s->watch.rfd);
FD_ZERO(&s->watch.wfd);
FD_ZERO(&s->watch.xfd);
FD_ZERO(&s->active.rfd);
FD_ZERO(&s->active.wfd);
FD_ZERO(&s->active.xfd);
s->num_fd = 0;
s->num_fd_active = 0;
s->do_timeout = 0;
s->is_active = 0;
s->call = call;
s->data = data;
return s;
}
static void *activate(oop_adapter_select *s) {
if (!s->is_active) {
s->is_active = 1;
s->source->on_time(s->source,OOP_TIME_NOW,on_collect,s);
}
return OOP_CONTINUE;
}
static void deactivate(oop_adapter_select *s) {
if (s->is_active) {
s->source->cancel_time(s->source,OOP_TIME_NOW,on_collect,s);
s->is_active = 0;
s->num_fd_active = 0;
FD_ZERO(&s->active.rfd);
FD_ZERO(&s->active.wfd);
FD_ZERO(&s->active.xfd);
}
}
void oop_select_set(
oop_adapter_select *s,int num_fd,
fd_set *rfd,fd_set *wfd,fd_set *xfd,struct timeval *timeout)
{
int fd;
for (fd = 0; fd < num_fd || fd < s->num_fd; ++fd) {
int rfd_set = fd < num_fd && FD_ISSET(fd,rfd);
int wfd_set = fd < num_fd && FD_ISSET(fd,wfd);
int xfd_set = fd < num_fd && FD_ISSET(fd,xfd);
int w_rfd_set = fd < s->num_fd && FD_ISSET(fd,&s->watch.rfd);
int w_wfd_set = fd < s->num_fd && FD_ISSET(fd,&s->watch.wfd);
int w_xfd_set = fd < s->num_fd && FD_ISSET(fd,&s->watch.xfd);
if (rfd_set && !w_rfd_set) {
s->source->on_fd(s->source,fd,OOP_READ,on_fd,s);
FD_SET(fd,&s->watch.rfd);
}
if (!rfd_set && w_rfd_set) {
s->source->cancel_fd(s->source,fd,OOP_READ);
FD_CLR(fd,&s->watch.rfd);
}
if (wfd_set && !w_wfd_set) {
s->source->on_fd(s->source,fd,OOP_WRITE,on_fd,s);
FD_SET(fd,&s->watch.wfd);
}
if (!wfd_set && w_wfd_set) {
s->source->cancel_fd(s->source,fd,OOP_WRITE);
FD_CLR(fd,&s->watch.wfd);
}
if (xfd_set && !w_xfd_set) {
s->source->on_fd(s->source,fd,OOP_EXCEPTION,on_fd,s);
FD_SET(fd,&s->watch.xfd);
}
if (!xfd_set && w_xfd_set) {
s->source->cancel_fd(s->source,fd,OOP_EXCEPTION);
FD_CLR(fd,&s->watch.xfd);
}
}
s->num_fd = num_fd;
if (s->do_timeout) {
s->source->cancel_time(s->source,s->timeout,on_timeout,s);
s->do_timeout = 0;
}
if (NULL != timeout) {
gettimeofday(&s->timeout,NULL);
s->timeout.tv_sec += timeout->tv_sec;
s->timeout.tv_usec += timeout->tv_usec;
while (s->timeout.tv_usec >= 1000000) {
++s->timeout.tv_sec;
s->timeout.tv_usec -= 1000000;
}
s->do_timeout = 1;
s->source->on_time(s->source,s->timeout,on_timeout,s);
}
deactivate(s);
}
void oop_select_delete(oop_adapter_select *s) {
fd_set fd;
FD_ZERO(&fd);
oop_select_set(s,0,&fd,&fd,&fd,NULL);
oop_free(s);
}
static void set_fd(int fd,fd_set *fds,int *num) {
if (!FD_ISSET(fd,fds)) {
FD_SET(fd,fds);
if (fd >= *num) *num = fd + 1;
}
}
static void *on_fd(oop_source *source,int fd,oop_event event,void *data) {
oop_adapter_select *s = (oop_adapter_select *) data;
switch (event) {
case OOP_READ:
assert(FD_ISSET(fd,&s->watch.rfd));
set_fd(fd,&s->active.rfd,&s->num_fd_active);
break;
case OOP_WRITE:
assert(FD_ISSET(fd,&s->watch.wfd));
set_fd(fd,&s->active.wfd,&s->num_fd_active);
break;
case OOP_EXCEPTION:
assert(FD_ISSET(fd,&s->watch.xfd));
set_fd(fd,&s->active.xfd,&s->num_fd_active);
break;
default:
assert(0);
break;
}
return activate(s);
}
static void *on_timeout(oop_source *source,struct timeval when,void *data) {
oop_adapter_select *s = (oop_adapter_select *) data;
assert(s->do_timeout);
return activate(s);
}
static void *on_collect(oop_source *source,struct timeval when,void *data) {
oop_adapter_select *s = (oop_adapter_select *) data;
struct select_set set = s->active;
int num = s->num_fd_active;
struct timeval now;
gettimeofday(&now,NULL);
deactivate(s);
return s->call(s,num,&set.rfd,&set.wfd,&set.xfd,now,s->data);
}
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