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#include "reactor.h"
#include <errno.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include <sys/event.h>
#include <sys/types.h>
#include <unistd.h>
#include "minibuffer.h"
struct reactor {
int queue;
struct kevent events[16];
uint32_t nevents;
};
struct reactor *reactor_create(void) {
int queue = kqueue();
if (queue < 0) {
return NULL;
}
struct reactor *reactor = calloc(1, sizeof(struct reactor));
reactor->queue = queue;
reactor->nevents = 0;
return reactor;
}
void reactor_destroy(struct reactor *reactor) {
close(reactor->queue);
reactor->queue = -1;
free(reactor);
}
void reactor_update(struct reactor *reactor) {
int events = kevent(reactor->queue, NULL, 0, reactor->events, 16, NULL);
if (events == -1) {
// TODO: what to do here?
return;
}
reactor->nevents = events;
}
bool reactor_poll_event(struct reactor *reactor, uint32_t ev_id) {
for (uint32_t ei = 0; ei < reactor->nevents; ++ei) {
struct kevent *ev = &reactor->events[ei];
if (ev->ident == ev_id) {
return true;
}
}
return false;
}
uint32_t reactor_register_interest(struct reactor *reactor, int fd,
enum interest interest) {
struct kevent changes[2] = {0};
uint32_t nchanges = 0;
if ((interest & ReadInterest) != 0) {
EV_SET(&changes[0], fd, EVFILT_READ, EV_ADD, 0, 0, NULL);
++nchanges;
}
if ((interest & WriteInterest) != 0) {
EV_SET(&changes[1], fd, EVFILT_WRITE, EV_ADD, 0, 0, NULL);
++nchanges;
}
if (kevent(reactor->queue, changes, nchanges, NULL, 0, NULL) < 0) {
return -1;
}
return fd;
}
uint32_t reactor_watch_file(struct reactor *reactor, const char *path,
uint32_t mask) {
uint32_t fflags = NOTE_WRITE | NOTE_DELETE | NOTE_RENAME | NOTE_REVOKE;
int fd = open(path, O_RDONLY);
if (fd < 0) {
minibuffer_echo_timeout(4, "failed to watch %s: %s", path, strerror(errno));
return 0;
}
struct kevent new_event;
EV_SET(&new_event, fd, EVFILT_VNODE, EV_ADD | EV_CLEAR | EV_ENABLE, fflags, 0,
NULL);
if (kevent(reactor->queue, &new_event, 1, NULL, 0, NULL) < 0) {
return 0;
}
return fd;
}
void reactor_unwatch_file(struct reactor *reactor, uint32_t id) {
// all kevents for this fd are removed automatically when closed
close(id);
}
bool reactor_next_file_event(struct reactor *reactor, struct file_event *out) {
// find the next vnode event and pop it from the events
struct kevent ev;
bool found = false;
for (uint32_t e = 0; e < reactor->nevents; ++e) {
if (reactor->events[e].filter == EVFILT_VNODE) {
ev = reactor->events[e];
reactor->events[e] = reactor->events[reactor->nevents - 1];
--reactor->nevents;
found = true;
break;
}
}
if (!found) {
return false;
}
out->mask = FileWritten;
if ((ev.fflags & NOTE_DELETE) || (ev.fflags & NOTE_RENAME) ||
(ev.fflags & NOTE_REVOKE)) {
out->mask |= LastEvent;
}
out->id = ev.ident;
return true;
}
void reactor_unregister_interest(struct reactor *reactor, uint32_t ev_id) {
struct kevent changes[2] = {0};
EV_SET(&changes[0], ev_id, EVFILT_READ, EV_DELETE, 0, 0, NULL);
EV_SET(&changes[1], ev_id, EVFILT_WRITE, EV_DELETE, 0, 0, NULL);
kevent(reactor->queue, changes, 2, NULL, 0, NULL);
}
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