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#include <limits.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <poll.h>
#include <fdwatcher.h>
int
fdwatcher_initialise(struct FDWatchHandle *handle, int maxWatchedFds)
{
size_t pollfdSize = maxWatchedFds * sizeof(handle->watchedFds);
size_t pointersSize = maxWatchedFds * sizeof(void *);
handle->watchedFds = malloc(pollfdSize);
if (errno != 0) {
perror("fdwatcher_initialise: malloc(3)");
return -errno;
}
handle->arbitraryData = malloc(pointersSize);
if (errno != 0) {
perror("fdwatcher_initialise: malloc(3)");
return -errno;
}
memset(handle->watchedFds, 0, pollfdSize);
handle->maxWatchedFds = maxWatchedFds;
return 0;
}
int
fdwatcher_add(struct FDWatchHandle *handle, int fd, void *arbitrary)
{
struct pollfd *watchedFd = NULL;
if (handle->maxWatchedFds == handle->watchedFdCount) {
printf("meow\n");
return -EMFILE;
}
handle->arbitraryData[handle->watchedFdCount] = arbitrary;
watchedFd = &(handle->watchedFds[handle->watchedFdCount]);
watchedFd->events = POLLIN | POLLHUP | POLLRDHUP;
watchedFd->revents = 0;
watchedFd->fd = fd;
handle->watchedFdCount = handle->watchedFdCount + 1;
return 0;
}
static int
_fdwatcher_handleEvents_revents(struct pollfd *pollie, struct FDWatchHandle *handle,
int (*meow)(struct FDWatchHandle *, enum FDWatch_EventType, int, void *),
size_t elementNumber)
{
int ret = 0;
if (pollie->revents & POLLHUP || pollie->revents & POLLRDHUP) {
ret = meow(handle, FDWATCH_EVENT_HUP, pollie->fd, handle->arbitraryData[elementNumber]);
if (ret == 0) {
return 1;
}
}
if (pollie->revents & POLLIN) {
meow(handle, FDWATCH_EVENT_INP, pollie->fd, handle->arbitraryData[elementNumber]);
}
return 0;
}
static int
_fdwatcher_handleEvents(struct FDWatchHandle *handle, int (*meow)(struct FDWatchHandle *handle, enum FDWatch_EventType, int, void *))
{
size_t i = 0;
int ret = 0;
while (1) {
struct pollfd *watchedFdEntry = NULL;
if (i == handle->watchedFdCount) break;
watchedFdEntry = &handle->watchedFds[i];
if (watchedFdEntry->revents != 0) {
ret = _fdwatcher_handleEvents_revents(watchedFdEntry, handle, meow, i);
watchedFdEntry->revents = 0;
if (ret != 0) {
return 1;
}
}
i++;
}
return 0;
}
int
fdwatcher_watch(struct FDWatchHandle *handle, int (*meow)(struct FDWatchHandle *handle, enum FDWatch_EventType, int, void *))
{
int ret = 0;
while (1) {
ret = poll(handle->watchedFds, handle->watchedFdCount, INT_MAX);
if (errno != 0) {
ret = meow(handle, FDWATCH_EVENT_ERR, 0, NULL);
if (ret == 1) break;
errno = 0;
continue;
}
ret = _fdwatcher_handleEvents(handle, meow);
if (ret == 1) {
return 1;
}
}
return 0;
}
/* TODO */
int
fdwatcher_remove(struct FDWatchHandle *handle, int fd)
{
abort();
}
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