inotify_c.c 2.46 KB
Newer Older
Camil Staps's avatar
Camil Staps committed
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35
#include <errno.h>
#include <fcntl.h>
#include <poll.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/inotify.h>
#include <unistd.h>

#include "Clean.h"

char* clstocs(CleanString* cs) {
    char* s = calloc(CleanStringLength(cs) + 1, 1);
    uint8_t i;
    for (i = 0; i < CleanStringLength(cs); i++)
        s[i] = CleanStringCharacters(cs)[i];
    s[i] = 0;
    return s;
}

static struct {int length; char chars[1]; } empty_string = {0,""};

int clean_errno(int ignored) {
	return errno;
}

int clean_inotify_init(int ignored) {
	int fd;
	fd = inotify_init();
	if (fd < 0)
		return 0;
	fcntl(fd, IN_NONBLOCK);
	return fd;
}

Camil Staps's avatar
Camil Staps committed
36 37
void clean_inotify_add_watch(int fd, CleanString* fname_, int mask,
		int *re_watch, int *re_fd) {
Camil Staps's avatar
Camil Staps committed
38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113
	char* fname = clstocs(fname_);
	*re_watch = inotify_add_watch(fd, fname, mask);
	free(fname);
	*re_fd = fd;
}

void clean_inotify_rm_watch(int fd, int watch, int *re_code, int *re_fd) {
	*re_fd = fd;
	*re_code = inotify_rm_watch(fd, watch);
}

void clean_poll(int fd, int *re_nrevents, int *re_fd) {
	struct pollfd pfd = {fd, POLLIN, 0};
	*re_nrevents = poll(&pfd, 1, -1);
	*re_fd = fd;
}

static CleanStringVariable(wds_string, 1024);
static CleanStringVariable(masks_string, 1024);

void clean_inotify_check(int fd,
		int *re_ok, CleanString* re_wds, CleanString* re_masks, int *re_fd) {
	char buf[4096] __attribute__((aligned(__alignof__(struct inotify_event))));
	const struct inotify_event *ev;
	ssize_t len;
	char *ptr;

	struct pollfd pfd = {fd, POLLIN, 0};
	int poll_n;

	char *wds_ptr = CleanStringCharacters(wds_string);
	char *masks_ptr = CleanStringCharacters(masks_string);
	CleanStringLength(wds_string) = 0;
	CleanStringLength(masks_string) = 0;

	*re_ok = 0;
	*re_fd = fd;

	*re_wds = (CleanString) &empty_string;
	*re_masks = (CleanString) &empty_string;

	for (;;) {
		poll_n = poll(&pfd, 1, 50);
		if (poll_n < 0) {
			return;
		} else if (poll_n == 0) {
			break;
		}

		len = read(fd, buf, sizeof buf);
		if (len == -1 && errno != EAGAIN) {
			return;
		}
		if (len <= 0) {
			break;
		}

		for (ptr = buf; ptr < buf + len;
				ptr += sizeof(struct inotify_event) + ev->len) {
			ev = (const struct inotify_event*) ptr;

			memcpy(masks_ptr, &ev->mask, 4);
			masks_ptr += 4;
			CleanStringLength(masks_string) += 4;

			memcpy(wds_ptr, &ev->wd, sizeof(int));
			wds_ptr += sizeof(int);
			CleanStringLength(wds_string) += sizeof(int);
		}
	}

	*re_wds = (CleanString) wds_string;
	*re_masks = (CleanString) masks_string;

	*re_ok = 1;
}