inotify.c

#include <stdio.h>            
#include <unistd.h>
#include <sys/inotify.h>

int main(int argc, char *argv[])
{
	if (argc < 2) {
		fprintf(stderr, "Usage: %s path\n", argv[0]);
		return -1;
	}
	const char *path = argv[1];
	if (access(path, R_OK))  {
		fprintf(stderr, "Path %s does not exist\n", path);
		return -1;
	}
	fprintf(stdout, "Watching %s\n", path);
	int inotify_fd = inotify_init();
	int i;
	for (i = 0; i < 100000; i++) {
		int wd = inotify_add_watch(inotify_fd, path, IN_ALL_EVENTS);
		if (wd < 0) {
			fprintf(stderr, "add watch failed\n");
			return -1;
		}
		inotify_rm_watch(inotify_fd, wd);
	}
	close(inotify_fd);
	return 0;
}

shell.log

kostja@atlas ~ % gcc ./inotify.c; time ./a.out /home/kostja/work/tarantool/src/box/lua/schema.lua
Watching /home/kostja/work/tarantool/src/box/lua/schema.lua
./a.out /home/kostja/work/tarantool/src/box/lua/schema.lua  0.00s user 0.36s system 98% cpu 0.366 total
kostja@atlas ~ % time ./a.out /home/kostja/inotify.c        
Watching /home/kostja/inotify.c                                      
./a.out /home/kostja/inotify.c  0.00s user 0.23s system 97% cpu 0.237 total
kostja@atlas ~ % time ./a.out /home                 
Watching /home
./a.out /home  0.00s user 0.23s system 97% cpu 0.241 total
kostja@atlas ~ % time ./a.out /var 
Watching /var
./a.out /var  0.00s user 0.25s system 98% cpu 0.263 total
kostja@atlas ~ % time ./a.out /tmp
Watching /tmp
./a.out /tmp  0.00s user 4.99s system 98% cpu 5.053 total