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Linux: unlockpt needs to fail with EINVAL, not ENOTTY (bug 26053)

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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>
This commit is contained in:
Florian Weimer 2020-10-07 10:48:10 +02:00
parent c42b7058a2
commit 0f9793a556
2 changed files with 21 additions and 20 deletions
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20
login/tst-grantpt.c
View File

@ -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);
}

21
sysdeps/unix/sysv/linux/unlockpt.c
View File

@ -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;
}