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#include <errno.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/inotify.h>
#include <linux/limits.h>
#include <unistd.h>
#include <algorithm>
#include "common.h"
static int g_inotify;
static int g_init_errno;
void PlatformInit() {
  g_inotify = inotify_init();
  if (g_inotify == -1) {
    g_init_errno = errno;
    return;
  WakeupNewThread();
void PlatformThread() {
  // Needs to be large enough for sizeof(inotify_event) + strlen(filename).
  char buf[4096];
  while (true) {
    int size;
      size = read(g_inotify, buf, sizeof(buf));
    } while (size == -1 && errno == EINTR);
    if (size == -1) {
      break;
    } else if (size == 0) {
      break;
    inotify_event* e;
    for (char* p = buf; p < buf + size; p += sizeof(*e) + e->len) {
      e = reinterpret_cast<inotify_event*>(p);
      int fd = e->wd;
      EVENT_TYPE type;
      std::vector<char> path;
      // Note that inotify won't tell us where the file or directory has been
      // moved to, so we just treat IN_MOVE_SELF as file being deleted.
      if (e->mask & (IN_ATTRIB | IN_CREATE | IN_DELETE | IN_MODIFY | IN_MOVE)) {
        type = EVENT_CHANGE;
      } else if (e->mask & (IN_DELETE_SELF | IN_MOVE_SELF)) {
        type = EVENT_DELETE;
      } else {
        continue;
      PostEventAndWait(type, fd, path);
WatcherHandle PlatformWatch(const char* path) {
  if (g_inotify == -1) {
    return -g_init_errno;
  int fd = inotify_add_watch(g_inotify, path, IN_ATTRIB | IN_CREATE |
      IN_DELETE | IN_MODIFY | IN_MOVE | IN_MOVE_SELF | IN_DELETE_SELF);
  if (fd == -1) {
    return -errno;
  return fd;
void PlatformUnwatch(WatcherHandle fd) {
  inotify_rm_watch(g_inotify, fd);
bool PlatformIsHandleValid(WatcherHandle handle) {
  return handle >= 0;
int PlatformInvalidHandleToErrorNumber(WatcherHandle handle) {
  return -handle;

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