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/*
* rwc [-0cdep] [PATH...] - report when changed
* -0 use NUL instead of newline for input/output separator
* -c detect all creations (open/O_CREAT, mkdir, link, symlink, bind)
* -d detect deletions too (prefixed with "- ")
* -e exit after the first reported change
* -p pipe mode, don't generate new events if stdout pipe is not empty
*
* To the extent possible under law, Leah Neukirchen <leah@vuxu.org>
* has waived all copyright and related or neighboring rights to this work.
* http://creativecommons.org/publicdomain/zero/1.0/
*/
#include <sys/inotify.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <errno.h>
#include <libgen.h>
#include <limits.h>
#include <search.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
char *argv0;
char ibuf[8192];
int ifd;
int cflag;
int dflag;
int eflag;
int pflag;
char input_delim = '\n';
static void *root = 0; // tree
static int
order(const void *a, const void *b)
{
return strcmp((char *)a, (char *)b);
}
struct wdmap {
int wd;
char *dir;
};
static void *wds = 0; // tree
static int
wdorder(const void *a, const void *b)
{
struct wdmap *ia = (struct wdmap *)a;
struct wdmap *ib = (struct wdmap *)b;
if (ia->wd == ib->wd)
return 0;
else if (ia->wd < ib->wd)
return -1;
else
return 1;
}
static char *
realpath_nx(char *path)
{
char *r = realpath(path, 0);
if (!r && errno == ENOENT) {
// resolve dirname and append basename
char *path2 = strdup(path);
if (!path2)
return 0;
char *d = realpath(dirname(path2), 0);
free(path2);
if (!d)
return 0;
char *b = basename(path);
size_t l = strlen(d) + 1 + strlen(b) + 1;
r = malloc(l);
if (!r)
return 0;
snprintf(r, l, "%s/%s", d, b);
}
return r;
}
static void
add(char *path)
{
struct stat st;
int wd;
char *file = realpath_nx(path);
if (!file) {
fprintf(stderr, "%s: realpath: %s: %s\n",
argv0, path, strerror(errno));
return;
}
char *dir = file;
tsearch(strdup(file), &root, order);
// assume non-existing files are regular files
if (lstat(file, &st) < 0 || !S_ISDIR(st.st_mode))
dir = dirname(file);
wd = inotify_add_watch(ifd, dir,
IN_MOVED_TO | IN_CLOSE_WRITE | cflag | dflag);
if (wd < 0) {
fprintf(stderr, "%s: inotify_add_watch: %s: %s\n",
argv0, dir, strerror(errno));
} else {
struct wdmap *newkey = malloc(sizeof (struct wdmap));
newkey->wd = wd;
newkey->dir = dir;
tsearch(newkey, &wds, wdorder);
}
}
int
main(int argc, char *argv[])
{
int c, i;
char *line = 0;
argv0 = argv[0];
while ((c = getopt(argc, argv, "0cdep")) != -1)
switch (c) {
case '0': input_delim = 0; break;
case 'c': cflag = IN_CREATE; break;
case 'd': dflag = IN_DELETE|IN_DELETE_SELF|IN_MOVED_FROM; break;
case 'e': eflag++; break;
case 'p': pflag++; break;
default:
fprintf(stderr, "Usage: %s [-0cdep] [PATH...]\n", argv0);
exit(2);
}
ifd = inotify_init();
if (ifd < 0) {
fprintf(stderr, "%s: inotify_init: %s\n",
argv0, strerror(errno));
exit(111);
}
i = optind;
if (optind == argc)
goto from_stdin;
for (; i < argc; i++) {
if (strcmp(argv[i], "-") != 0) {
add(argv[i]);
continue;
}
from_stdin:
while (1) {
size_t linelen = 0;
ssize_t rd;
errno = 0;
rd = getdelim(&line, &linelen, input_delim, stdin);
if (rd == -1) {
if (errno != 0)
return -1;
break;
}
if (rd > 0 && line[rd-1] == input_delim)
line[rd-1] = 0; // strip delimiter
add(line);
}
}
free(line);
while (1) {
ssize_t len, i;
struct inotify_event *ev;
len = read(ifd, ibuf, sizeof ibuf);
if (len <= 0) {
fprintf(stderr, "%s: error reading inotify buffer: %s",
argv0, strerror(errno));
exit(1);
}
for (i = 0; i < len; i += sizeof (*ev) + ev->len) {
ev = (struct inotify_event *)(ibuf + i);
if (ev->mask & IN_IGNORED)
continue;
struct wdmap key, **result;
key.wd = ev->wd;
key.dir = 0;
result = tfind(&key, &wds, wdorder);
if (!result)
continue;
char *dir = (*result)->dir;
char fullpath[PATH_MAX];
char *name = ev->name;
if (strcmp(dir, ".") != 0) {
snprintf(fullpath, sizeof fullpath, "%s/%s",
dir, ev->name);
name = fullpath;
}
if (tfind(name, &root, order) ||
tfind(dir, &root, order)) {
if (pflag) {
int n;
ioctl(1, FIONREAD, &n);
if (n > 0)
break;
}
const char *mark = "";
if (ev->mask & (IN_DELETE | IN_MOVED_FROM))
mark = "- ";
else if (ev->mask & IN_CREATE)
mark = "+ ";
printf("%s%s%c", mark, name, input_delim);
fflush(stdout);
if (eflag)
exit(0);
}
}
}
return 0;
}
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