public inbox for glibc-cvs@sourceware.org
help / color / mirror / Atom feed
* [glibc] Linux: unlockpt needs to fail with EINVAL, not ENOTTY (bug 26053)
@ 2020-10-07 8:57 Florian Weimer
0 siblings, 0 replies; only message in thread
From: Florian Weimer @ 2020-10-07 8:57 UTC (permalink / raw)
To: glibc-cvs
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=0f9793a556675d67d7c1897553f92e7152d1e598
commit 0f9793a556675d67d7c1897553f92e7152d1e598
Author: Florian Weimer <fweimer@redhat.com>
Date: Wed Oct 7 10:48:10 2020 +0200
Linux: unlockpt needs to fail with EINVAL, not ENOTTY (bug 26053)
The EINVAL error code is mandated by POSIX and documented in the
manual. Also clean up the unlockpt implementation a bit, assuming
that TIOCSPTLCK is always defined.
Enhance login/tst-grantpt to cover unlockpt corner cases.
Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Diff:
---
login/tst-grantpt.c | 20 ++++++++++++++++----
sysdeps/unix/sysv/linux/unlockpt.c | 21 +++++----------------
2 files changed, 21 insertions(+), 20 deletions(-)
diff --git a/login/tst-grantpt.c b/login/tst-grantpt.c
index 1d7a220fcf..8ca901ef94 100644
--- a/login/tst-grantpt.c
+++ b/login/tst-grantpt.c
@@ -1,4 +1,4 @@
-/* Test for grantpt error corner cases.
+/* Test for grantpt, unlockpt error corner cases.
Copyright (C) 2001-2020 Free Software Foundation, Inc.
This file is part of the GNU C Library.
@@ -28,7 +28,7 @@
#include <support/temp_file.h>
#include <support/xunistd.h>
-/* Test grantpt with a closed descriptor. */
+/* Test grantpt, unlockpt with a closed descriptor. */
static void
test_ebadf (void)
{
@@ -48,9 +48,12 @@ test_ebadf (void)
printf ("grantpt(): expected: return = %d, errno = %d\n", -1, EBADF);
printf (" got: return = %d, errno = %d\n", ret, err);
}
+
+ TEST_COMPARE (unlockpt (fd), -1);
+ TEST_COMPARE (errno, EBADF);
}
-/* Test grantpt on a regular file. */
+/* Test grantpt, unlockpt on a regular file. */
static void
test_einval (void)
{
@@ -68,10 +71,13 @@ test_einval (void)
printf (" got: return = %d, errno = %d\n", ret, err);
}
+ TEST_COMPARE (unlockpt (fd), -1);
+ TEST_COMPARE (errno, EINVAL);
+
xclose (fd);
}
-/* Test grantpt on a non-ptmx pseudo-terminal. */
+/* Test grantpt, unlockpt on a non-ptmx pseudo-terminal. */
static void
test_not_ptmx (void)
{
@@ -80,6 +86,9 @@ test_not_ptmx (void)
TEST_COMPARE (grantpt (ptmx), 0);
TEST_COMPARE (unlockpt (ptmx), 0);
+ /* A second unlock succeeds as well. */
+ TEST_COMPARE (unlockpt (ptmx), 0);
+
const char *name = ptsname (ptmx);
TEST_VERIFY_EXIT (name != NULL);
int pts = open (name, O_RDWR | O_NOCTTY);
@@ -88,6 +97,9 @@ test_not_ptmx (void)
TEST_COMPARE (grantpt (pts), -1);
TEST_COMPARE (errno, EINVAL);
+ TEST_COMPARE (unlockpt (pts), -1);
+ TEST_COMPARE (errno, EINVAL);
+
xclose (pts);
xclose (ptmx);
}
diff --git a/sysdeps/unix/sysv/linux/unlockpt.c b/sysdeps/unix/sysv/linux/unlockpt.c
index 3a0ac7a96c..4d98abece0 100644
--- a/sysdeps/unix/sysv/linux/unlockpt.c
+++ b/sysdeps/unix/sysv/linux/unlockpt.c
@@ -27,22 +27,11 @@
int
unlockpt (int fd)
{
-#ifdef TIOCSPTLCK
- int save_errno = errno;
int unlock = 0;
- if (__ioctl (fd, TIOCSPTLCK, &unlock))
- {
- if (errno == EINVAL)
- {
- __set_errno (save_errno);
- return 0;
- }
- else
- return -1;
- }
-#endif
- /* If we have no TIOCSPTLCK ioctl, all slave pseudo terminals are
- unlocked by default. */
- return 0;
+ int ret = __ioctl (fd, TIOCSPTLCK, &unlock);
+ if (ret != 0 && errno == ENOTTY)
+ /* POSIX mandates EINVAL for non-ptmx descriptors. */
+ __set_errno (EINVAL);
+ return ret;
}
^ permalink raw reply [flat|nested] only message in thread
only message in thread, other threads:[~2020-10-07 8:57 UTC | newest]
Thread overview: (only message) (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2020-10-07 8:57 [glibc] Linux: unlockpt needs to fail with EINVAL, not ENOTTY (bug 26053) Florian Weimer
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).