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Diffstat (limited to 'libc/termios/ttyname.c')
-rw-r--r--libc/termios/ttyname.c45
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;
+}