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// rwc [-0d] [PATH...] - report when changed
// -0 use NUL instead of newline for input/output separator
// -d detect deletions too (prefixed with "- ")
#include <sys/inotify.h>
#include <sys/stat.h>
#include <errno.h>
#include <libgen.h>
#include <search.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
char *argv0;
char ibuf[8192];
int ifd;
int dflag;
char input_delim = '\n';
static void *root = 0; // tree
int
order(const void *a, const void *b)
{
return strcmp((char *)a, (char*)b);
}
void
add(char *file)
{
struct stat st;
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);
if (inotify_add_watch(ifd, dir, IN_MOVED_TO | IN_CLOSE_WRITE | dflag)<0)
fprintf(stderr, "%s: inotify_add_watch: %s: %s\n",
argv0, dir, strerror(errno));
}
int
main(int argc, char *argv[])
{
int c, i;
argv0 = argv[0];
while ((c = getopt(argc, argv, "0d")) != -1)
switch(c) {
case '0': input_delim = 0; break;
case 'd': dflag = IN_DELETE | IN_DELETE_SELF; break;
default:
fprintf(stderr, "Usage: %s [-0d] [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) {
char *line = 0;
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);
}
}
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;
if (tfind(ev->name, &root, order) ||
tfind(dirname(ev->name), &root, order)) {
printf("%s%s%c",
(ev->mask & IN_DELETE ? "- " : ""),
ev->name,
input_delim);
fflush(stdout);
}
}
}
return 0;
}
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