1 files changed, 45 insertions, 0 deletions
diff --git a/libc/termios/ttyname.c b/libc/termios/ttyname.c
new file mode 100644
index 000000000..897243e71
--- /dev/null
+++ b/libc/termios/ttyname.c
@@ -0,0 +1,45 @@
+
+#include <errno.h>
+#include <sys/stat.h>
+#include <dirent.h>
+
+char *
+ttyname(fd)
+int   fd;
+{
+   static char dev[] = "/dev";
+   struct stat st, dst;
+   DIR  *fp;
+   struct dirent *d;
+   static char name[NAME_MAX];
+   int noerr = errno;
+
+   if (fstat(fd, &st) < 0)
+      return 0;
+   if (!isatty(fd))
+   {
+      errno = ENOTTY;
+      return 0;
+   }
+
+   fp = opendir(dev);
+   if (fp == 0)
+      return 0;
+   strcpy(name, dev);
+   strcat(name, "/");
+
+   while ((d = readdir(fp)) != 0)
+   {
+      strcpy(name + sizeof(dev), d->d_name);
+      if (stat(name, &dst) == 0
+         && st.st_dev == dst.st_dev && st.st_ino == dst.st_ino)
+      {
+	 closedir(fp);
+	 errno = noerr;
+	 return name;
+      }
+   }
+   closedir(fp);
+   errno = noerr;
+   return 0;
+}