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/* * Copyright (c) 2013 Eric Radman <ericshane@eradman.com>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/inotify.h>
#include <sys/event.h>
#include <errno.h>
#include <limits.h>
#include <poll.h>
#include <stdio.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include "compat.h"
#include "../data.h"
/* globals */
extern WatchFile **files;
/* utility forwards */
static WatchFile * file_by_descriptor(int fd);
/* utility functions */
static WatchFile *
file_by_descriptor(int wd) {
int i;
for (i=0; files[i] != NULL; i++) {
if (files[i]->fd == wd)
return files[i];
}
return NULL; /* lookup failed */
}
/* interface */
#define EVENT_SIZE (sizeof (struct inotify_event))
#define EVENT_BUF_LEN (32 * (EVENT_SIZE + 16))
/*
* Conveniently inotify and kqueue ids both have the type `int`
*/
int
kqueue(void) {
return inotify_init();
}
/*
* Emulate kqueue(2). Only the flags used in entr.c are considered
* Returns the number of eventlist structs filled by this call
*/
int
kevent(int kq, const struct kevent *changelist, int nchanges, struct
kevent *eventlist, int nevents, const struct timespec *timeout) {
int n;
int wd;
WatchFile *file;
char buf[EVENT_BUF_LEN];
ssize_t len;
int pos;
struct inotify_event *iev;
u_int fflags;
const struct kevent *kev;
int ignored;
struct pollfd pfd;
if (nchanges > 0) {
ignored = 0;
for (n=0; n<nchanges; n++) {
kev = changelist + (sizeof(struct kevent)*n);
file = (WatchFile *)kev->udata;
if (kev->flags & EV_DELETE) {
inotify_rm_watch(kq /* ifd */, kev->ident);
file->fd = -1; /* invalidate */
}
else if (kev->flags & EV_ADD) {
wd = inotify_add_watch(kq /* ifd */, file->fn,
IN_CLOSE_WRITE|IN_DELETE_SELF|IN_MODIFY|IN_MOVE_SELF);
if (wd < 0)
return -1;
close(file->fd);
file->fd = wd; /* replace with watch descriptor */
}
else
ignored++;
}
return nchanges - ignored;
}
pfd.fd = kq;
pfd.events = POLLIN;
if (timeout != 0 && (poll(&pfd, 1, timeout->tv_nsec/1000000) == 0))
return 0;
/* Consolidate events over 50ms since some Linux apps write to a
file before deleting it */
n = 0;
do {
pos = 0;
len = read(kq /* ifd */, &buf, EVENT_BUF_LEN);
if (len < 0) {
/* SA_RESTART doesn't work for inotify fds */
if (errno == EINTR)
continue;
else
perror("read");
}
while ((pos < len) && (n < nevents)) {
iev = (struct inotify_event *) &buf[pos];
pos += EVENT_SIZE + iev->len;
#ifdef DEBUG
fprintf(stderr, "wd: %d mask: 0x%x\n", iev->wd, iev->mask);
#endif
/* convert iev->mask; to comparable kqueue flags */
fflags = 0;
if (iev->mask & IN_DELETE_SELF) fflags |= NOTE_DELETE;
if (iev->mask & IN_CLOSE_WRITE) fflags |= NOTE_WRITE;
if (iev->mask & IN_MOVE_SELF) fflags |= NOTE_RENAME;
if (fflags == 0) continue;
eventlist[n].ident = iev->wd;
eventlist[n].filter = EVFILT_VNODE;
eventlist[n].flags = 0;
eventlist[n].fflags = fflags;
eventlist[n].data = 0;
eventlist[n].udata = file_by_descriptor(iev->wd);
n++;
}
}
while ((poll(&pfd, 1, 50) > 0));
return n;
}
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