Mirror of :pserver:cvs@cvs.fefe.de:/cvs libowfat https://www.fefe.de/libowfat/
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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_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. */
void io_dontwantwrite_really(int64 d,io_entry* e) {
int newfd;
assert(e->kernelwantwrite);
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=0;
if (e->wantread) x.events|=EPOLLIN;
x.data.fd=d;
epoll_ctl(io_master,e->kernelwantread?EPOLL_CTL_MOD:EPOLL_CTL_DEL,d,&x);
}
#endif
#ifdef HAVE_KQUEUE
if (io_waitmode==KQUEUE) {
struct kevent kev;
struct timespec ts;
EV_SET(&kev, d, EVFILT_WRITE, EV_DELETE, 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=0;
if (e->kernelwantread) x.events|=POLLIN;
if (!x.events) x.events=POLLREMOVE;
write(io_master,&x,sizeof(x));
}
#endif
e->wantwrite=0;
e->kernelwantwrite=0;
}
void io_dontwantwrite(int64 d) {
io_entry* e=array_get(&io_fds,sizeof(io_entry),d);
if (e) {
if (e->canwrite)
io_dontwantwrite_really(d,e);
e->wantwrite=0;
}
}