bore

commit 530b47040cddd955142feaaeec150737452b1723
parent 111c4e6b335f1c90be53cac502466c9adb8df797
Author: phoebos <ben@bvnf.space>
Date:   Sun, 10 Oct 2021 00:30:54 +0100

tty: add

Diffstat:
M
Makefile
 | 
1
+
M
PROGRESS
 | 
2
+-
A
tty.c
 | 
18
++++++++++++++++++

3 files changed, 20 insertions(+), 1 deletion(-)
diff --git a/Makefile b/Makefile
@@ -10,6 +10,7 @@ BINS = \
 	mkdir \
 	tee \
 	true \
+	tty \
 	wc \
 
 CC = cc
diff --git a/PROGRESS b/PROGRESS
@@ -43,7 +43,7 @@
 [ ] touch
 [ ] tr
 [x] true
-[ ] tty
+[x] tty
 [ ] uname
 [ ] uudecode
 [ ] uuencode
diff --git a/tty.c b/tty.c
@@ -0,0 +1,18 @@
+#include <errno.h>
+#include <stdio.h>
+#include <unistd.h>
+
+int
+main(void) {
+    char *tty = ttyname(0);
+    if (tty == NULL) {
+        if (errno != ENOTTY) {
+            perror("tty");
+            return 2;
+        }
+        printf("not a tty\n");
+        return 1;
+    }
+    printf("%s\n", tty);
+    return 0;
+}