From 7fe5629a1ab9d1f67ad1d1eabbfb65003ff82622 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?John=20Ankarstr=C3=B6m?= <john@ankarstrom.se>
Date: Wed, 14 Jul 2021 14:22:35 +0200
Subject: Add r1.c

---
 r1.c | 76 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 76 insertions(+)
 create mode 100644 r1.c

(limited to 'r1.c')

diff --git a/r1.c b/r1.c
new file mode 100644
index 0000000..d2c0ec5
--- /dev/null
+++ b/r1.c
@@ -0,0 +1,76 @@
+#include <err.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <string.h>
+#include <sys/select.h>
+
+#define MAXBUF 2048
+
+fd_set rfds0, rfds1;
+struct timeval timeout;
+
+int
+main()
+{
+	char buf[MAXBUF];
+	FILE *in, *out;
+	int c, i, n, ofd, state;
+
+	if(!(in = fopen("/var/tmp/r.in", "w")))
+		err(1, "fopen");
+	if(!(out = fopen("/var/tmp/r.out", "r")))
+		err(1, "fopen");
+	ofd = fileno(out);
+
+	FD_ZERO(&rfds0);
+	FD_SET(0, &rfds0);
+
+	FD_ZERO(&rfds1);
+	FD_SET(ofd, &rfds1);
+
+	timeout.tv_sec = 1;
+	timeout.tv_usec = 0;
+
+	for(state = 0; printf("."); state = !state)
+		switch(state){
+		case 0:
+			if(!select(0+1, &rfds0, NULL, NULL, &timeout))
+				break;
+			printf("0 ready\n");
+			break;
+		case 1:
+			if(!select(ofd+1, &rfds1, NULL, NULL, &timeout))
+				break;
+			printf("1 ready\n");
+			break;
+		}
+
+#if 0
+	for(;;){
+		printf(".");
+		FD_ZERO(&read_set);
+		FD_SET(0, &read_set);
+		FD_SET(ofd, &read_set);
+		switch(select(ofd+1, &read_set, NULL, NULL, &timeout)){
+		case -1:
+			err(1, "select");
+			break;
+		case 0:
+			break;
+		default:
+			if(FD_ISSET(0, &read_set)){
+				fgets(buf, MAXBUF, stdin);
+				buf[strcspn(buf, "\n")] = 0;
+				printf("in: %s\n", buf);
+			}else if(FD_ISSET(ofd, &read_set)){
+				fgets(buf, MAXBUF, stdin);
+				buf[strcspn(buf, "\n")] = 0;
+				printf("out: %s\n", buf);
+			}else{
+				printf("?\n");
+			}
+		}
+	}
+#endif
+
+}
-- 
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