1 files changed, 142 insertions, 0 deletions
diff --git a/freebsd/kqueue.c b/freebsd/kqueue.c
new file mode 100644
index 0000000..e8825db
--- /dev/null
+++ b/freebsd/kqueue.c
@@ -0,0 +1,142 @@
+#include <sys/types.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <fcntl.h>
+#include <sys/event.h>
+#include <sys/time.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include <string.h>
+#include <errno.h>
+
+int printer_ready;
+char * printer;
+char * queue_dir;
+char * trigger;
+#define BUFLEN 50
+char queue_dir_new[BUFLEN];
+char trigger_cmd[BUFLEN];
+
+int open_and_subscribe(struct kevent * change, const char * path)
+{
+	int f;
+	f = open(path, O_RDONLY);
+	if (f == -1) {
+		perror("open");
+		return -1;
+	}
+
+	EV_SET(change, f, EVFILT_VNODE,
+	                  EV_ADD | EV_ENABLE | EV_ONESHOT,
+	                  NOTE_DELETE | NOTE_EXTEND |
+	                  NOTE_WRITE | NOTE_ATTRIB,
+	       0, 0);
+}
+
+int check_printer_status(){
+	struct stat buf;
+	//printf("%s\n", printer);
+	int r = stat(printer, &buf);
+	if (r<0) {
+		if (printer_ready != 0) {
+			printf("Printer offline\n");
+		}
+		printer_ready = 0;
+		if (errno == ENOENT) {
+			printf("Printer not detected\n");
+		} else {
+			perror("stat");
+			return -1;
+		}
+	} else {
+		if (printer_ready != 1) {
+			printf("Printer online\n");
+			print_loop(printer, queue_dir);
+		}
+		printer_ready = 1;
+	}
+	return 0;
+}
+
+int print_loop()
+{
+	FILE * p;
+	int status;
+	char buf[BUFLEN];
+	printf("Print loop\n");
+	p = popen(trigger_cmd, "r");
+	if (p == NULL)
+		perror("popen");
+	while (fgets(buf, BUFLEN, p) != NULL)
+		printf("%s", buf);
+	status = pclose(p);
+	if (status != 0) {
+		printf("Trigger exited with status %d\n", status);
+	}
+	return status;
+}
+
+int main(int argc, const char * argv[])
+{
+	int fd, fq, kq, nev;
+	struct kevent change;
+	struct kevent event;
+
+	int len;
+
+	if (argc != 4) {
+		fprintf(stderr, "usage: %s printer queue_dir trigger\n", argv[0]);
+		return -1;
+	}
+	printer = strdup(argv[1]);
+	queue_dir = strdup(argv[2]);
+	trigger = strdup(argv[3]);
+
+	len = snprintf(trigger_cmd, BUFLEN, "%s %s %s", trigger, printer, queue_dir);
+	if (len >= BUFLEN - 1) {
+		printf("Buffer too small\n");
+		return -1;
+	}
+
+	len = snprintf(queue_dir_new, BUFLEN, "%s/new", queue_dir);
+	if (len >= BUFLEN - 1) {
+		printf("Buffer too small\n");
+		return -1;
+	}
+
+	printer_ready = 0;
+
+	kq = kqueue();
+	if (kq == -1)
+		perror("kqueue");
+
+	fq = open_and_subscribe(&change, queue_dir_new);
+
+	struct timespec timeout;
+	timeout.tv_sec = 5;
+	timeout.tv_nsec = 0;
+
+	check_printer_status();
+	for (;;) {
+		nev = kevent(kq, &change, 1, &event, 1, &timeout);
+		if (nev == -1)
+			perror("kevent");
+		if (nev == 0) { // timeout
+			check_printer_status();
+		} else if (nev > 0) {
+			if (event.fflags & NOTE_DELETE) {
+				continue;
+			}
+			printf("Got event for %d\n", event.ident);
+			if (printer_ready) {
+				print_loop(printer, queue_dir, trigger);
+			}
+		}
+	}
+
+	close(kq);
+	close(fq);
+	close(fd);
+	return EXIT_SUCCESS;
+}