Don't make ttyname* fail if proc filesystem is not available

The ttyname and ttyname_r functions on Linux now fall back to
searching for the tty file descriptor in /dev/pts or /dev if /proc is
not available.  This allows creation of chroots without the procfs
mounted on /proc.

Fixes BZ #14516.

4 files changed, 12 insertions, 13 deletions

diff --git a/ChangeLog b/ChangeLog
index f72f4b4..2490456 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,10 @@
+2012-08-29  Siddhesh Poyarekar  <siddhesh@redhat.com>
+
+	[BZ #14516]
+	* sysdeps/unix/sysv/linux/ttyname.c (ttyname): Don't return
+	failure if reading from procfs failed.
+	* sysdeps/unix/sysv/linux/ttyname_r.c (ttyname_r): Likewise.
+
 2012-08-27  Joseph Myers  <joseph@codesourcery.com>
 
 	* sysdeps/unix/sysv/linux/kernel-features.h
diff --git a/NEWS b/NEWS
index 2471390..6abc6ea 100644
--- a/NEWS
+++ b/NEWS
@@ -12,7 +12,7 @@ Version 2.17
   3479, 5400, 6778, 6808, 9685, 11607, 13717, 13696, 13939, 14042, 14090,
   14166, 14150, 14151, 14154, 14157, 14166, 14173, 14195, 14252, 14283,
   14298, 14303, 14307, 14328, 14331, 14336, 14337, 14347, 14349, 14459,
-  14505, 14519
+  14505, 14516, 14519
 
 * Support for STT_GNU_IFUNC symbols added for s390 and s390x.
   Optimized versions of memcpy, memset, and memcmp added for System z10 and
@@ -40,6 +40,10 @@ Version 2.17
   New configure option --disable-build-nscd avoids building nscd itself;
   this is the default if --disable-nscd is used.
 
+* The ttyname and ttyname_r functions on Linux now fall back to searching for
+  the tty file descriptor in /dev/pts or /dev if /proc is not available.  This
+  allows creation of chroots without the procfs mounted on /proc.
+
 
 Version 2.16
 
diff --git a/sysdeps/unix/sysv/linux/ttyname.c b/sysdeps/unix/sysv/linux/ttyname.c
index 3dacd40..d3070c3 100644
--- a/sysdeps/unix/sysv/linux/ttyname.c
+++ b/sysdeps/unix/sysv/linux/ttyname.c
@@ -148,12 +148,6 @@ ttyname (int fd)
     }
 
   ssize_t len = __readlink (procname, ttyname_buf, buflen);
-  if (__builtin_expect (len == -1 && errno == ENOENT, 0))
-    {
-      __set_errno (EBADF);
-      return NULL;
-    }
-
   if (__builtin_expect (len != -1, 1))
     {
       if ((size_t) len >= buflen)
diff --git a/sysdeps/unix/sysv/linux/ttyname_r.c b/sysdeps/unix/sysv/linux/ttyname_r.c
index 2dd6781..211ed18 100644
--- a/sysdeps/unix/sysv/linux/ttyname_r.c
+++ b/sysdeps/unix/sysv/linux/ttyname_r.c
@@ -128,12 +128,6 @@ __ttyname_r (int fd, char *buf, size_t buflen)
   *_fitoa_word (fd, __stpcpy (procname, "/proc/self/fd/"), 10, 0) = '\0';
 
   ssize_t ret = __readlink (procname, buf, buflen - 1);
-  if (__builtin_expect (ret == -1 && errno == ENOENT, 0))
-    {
-      __set_errno (EBADF);
-      return EBADF;
-    }
-
   if (__builtin_expect (ret == -1 && errno == ENAMETOOLONG, 0))
     {
       __set_errno (ERANGE);