1 files changed, 23 insertions, 0 deletions
diff --git a/src/unistd/ctermid.c b/src/unistd/ctermid.c
new file mode 100644
index 00000000..21b44ec8
--- /dev/null
+++ b/src/unistd/ctermid.c
@@ -0,0 +1,23 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <limits.h>
+
+char *ctermid(char *s)
+{
+	static char *s2;
+	int fd;
+	if (!s) {
+		if (!s2) s2 = malloc(L_ctermid);
+		s = s2;
+	}
+	fd = open("/dev/tty", O_WRONLY | O_NOCTTY);
+	if (fd < 0)
+		return strcpy(s, "");
+	if (ttyname_r(fd, s, L_ctermid))
+		strcpy(s, "");
+	close(fd);
+	return s;
+}