1 files changed, 28 insertions, 0 deletions
diff --git a/src/unistd/ttyname_r.c b/src/unistd/ttyname_r.c
new file mode 100644
index 0000000..82acb75
--- /dev/null
+++ b/src/unistd/ttyname_r.c
@@ -0,0 +1,28 @@
+#include <unistd.h>
+#include <errno.h>
+#include <sys/stat.h>
+#include "syscall.h"
+
+int ttyname_r(int fd, char *name, size_t size)
+{
+	struct stat st1, st2;
+	char procname[sizeof "/proc/self/fd/" + 3*sizeof(int) + 2];
+	ssize_t l;
+
+	if (!isatty(fd)) return errno;
+
+	__procfdname(procname, fd);
+	l = readlink(procname, name, size);
+
+	if (l < 0) return errno;
+	else if (l == size) return ERANGE;
+
+	name[l] = 0;
+
+	if (stat(name, &st1) || fstat(fd, &st2))
+		return errno;
+	if (st1.st_dev != st2.st_dev || st1.st_ino != st2.st_ino)
+		return ENODEV;
+
+	return 0;
+}