wait_udc_configured.c

#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>
#include <string.h>
#include <stdbool.h>
#include <sys/inotify.h>

int main(int argc, char *argv[])
{
	int ifd;
	union {
		struct inotify_event ie;
		unsigned char buf[0x200];
	} event;
	unsigned int i = 1;
	int fd;
	int n;
	char state[0x100];

	if (argc < 2)
		return i;
	i++;
	ifd = inotify_init();
	if (ifd < 0)
		return i;
	i++;
	if (inotify_add_watch(ifd, argv[1], IN_MODIFY) < 0)
		return i;
	i++;
	while (true) {
		read(ifd, &event.ie, sizeof(event.buf));
		fd = open(argv[1], O_RDONLY);
		if (fd < 0)
			return i;
		n = read(fd, state, sizeof(state));
		state[n - 1] = 0;
		close(fd);
		if (!strcmp(state, "configured"))
			return 0;
	}
}