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#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include "io_internal.h"
#ifdef HAVE_KQUEUE
#include <sys/types.h>
#include <sys/event.h>
#include <sys/time.h>
#endif
#ifdef HAVE_EPOLL
#include <inttypes.h>
#include <sys/epoll.h>
#include <byte.h>
#endif
#ifdef HAVE_SIGIO
#include <sys/poll.h>
#endif
#ifdef HAVE_DEVPOLL
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/devpoll.h>
#endif
#ifdef DEBUG
#include <assert.h>
#else
#define assert(x)
#endif
/* IDEA: if someone calls io_dontwantwrite, do not do the syscall to
* tell the kernel about it. Only when a write event comes in and the
* user has told us he does not want them, THEN tell the kernel we are
* not interested. In the typical protocol case of "write request, read
* reply", this should save a lot of syscalls.
* Now, if someone calls io_wantwrite, we might be in the situation that
* canwrite is already set. In that case, just enqueue the fd. */
void io_wantwrite_really(int64 d, io_entry* e) {
int newfd;
assert(!e->kernelwantwrite); /* we should not be here if we already told the kernel we want to write */
newfd=(!e->kernelwantread);
io_wanted_fds+=newfd;
#ifdef HAVE_EPOLL
if (io_waitmode==EPOLL) {
struct epoll_event x;
byte_zero(&x,sizeof(x)); // to shut up valgrind
x.events=EPOLLOUT;
if (e->kernelwantread) x.events|=EPOLLIN;
x.data.fd=d;
epoll_ctl(io_master,e->kernelwantread?EPOLL_CTL_MOD:EPOLL_CTL_ADD,d,&x);
}
#endif
#ifdef HAVE_KQUEUE
if (io_waitmode==KQUEUE) {
struct kevent kev;
struct timespec ts;
EV_SET(&kev, d, EVFILT_WRITE, EV_ADD|EV_ENABLE, 0, 0, 0);
ts.tv_sec=0; ts.tv_nsec=0;
kevent(io_master,&kev,1,0,0,&ts);
}
#endif
#ifdef HAVE_DEVPOLL
if (io_waitmode==DEVPOLL) {
struct pollfd x;
x.fd=d;
x.events=POLLOUT;
if (e->wantread) x.events|=POLLIN;
write(io_master,&x,sizeof(x));
}
#endif
#ifdef HAVE_SIGIO
if (io_waitmode==_SIGIO) {
struct pollfd p;
p.fd=d;
p.events=POLLOUT;
switch (poll(&p,1,0)) {
case 1: e->canwrite=1; break;
case 0: e->canwrite=0; break;
case -1: return;
}
if (e->canwrite) {
debug_printf(("io_wantwrite: enqueueing %lld in normal write queue before %ld\n",d,first_readable));
e->next_write=first_writeable;
first_writeable=d;
}
}
#endif
#ifdef __MINGW32__
printf("e->wantwrite == %d\n",e->wantwrite);
if (!e->wantwrite) {
e->next_write=first_writeable;
e->canwrite=1;
first_writeable=d;
printf("queueing write, setting first_writeable to %lld\n",d);
}
#endif
e->wantwrite=1;
e->kernelwantwrite=1;
}
void io_wantwrite(int64 d) {
io_entry* e=iarray_get(&io_fds,d);
if (!e) return;
if (e->wantwrite && e->kernelwantwrite) return;
if (e->canwrite) {
e->next_write=first_writeable;
first_writeable=d;
e->wantwrite=1;
return;
}
/* the harder case: do as before */
if (!e->kernelwantwrite) io_wantwrite_really(d, e); else e->wantwrite=1;
}