// reader1 - non-blocking FIFO reader example

#include "yadda.h"

int
main(int argc, char *argv[])
{
	char buf[MSG_MAX + 1], *fname;
	int fd;
	ssize_t amount;

	if (argc != 2 || !argv[1] || !argv[1][0]) {
		fputs("Usage: reader1 fifo-name\n", stderr);
		exit(1);
	}
	fname = argv[1];

#ifdef __OpenBSD__
	if (pledge("dpath stdio rpath unveil", NULL) == -1) err(1, "pledge");
	if (unveil(fname, "crw") == -1) err(1, "unveil");
	if (unveil(NULL, NULL) == -1) err(1, "unveil");
#endif

	if (mkfifo(fname, 0600) == -1 && errno != EEXIST)
		err(1, "mkfifo '%s'", fname);
	fd = open(fname, O_RDONLY | O_NDELAY);
	if (fd == -1) err(1, "open '%s'", fname);

	while (1) {
		if ((amount = read(fd, buf, MSG_MAX)) == -1) {
			if (errno != EAGAIN) warn("read");
		} else if (amount > 0) {
			buf[amount] = '\0';
			fprintf(stderr, "%ld %s\n", amount, buf);
			continue;
		}
		// KLUGE pretend to be doing other things
		sleep(10);
	}
}