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8f0a947cf5
`ptsname_r' is declared in stdlib.h to only accept a `nonnull' second argument and therefore GCC may choose to make optimizations based on the assumption that this argument is NULL. This means that potentially, GCC can optimize away the NULL check at some point in the future. Since this is a programming interface, we might as well remove the NULL check ourselves. This also warrants a change to the `ptsname_r' manual page that must be submitted to the corresponding mailing list. In addition, remove the NULL buffer test in login/tst-ptsname.c.
108 lines
2.8 KiB
C
108 lines
2.8 KiB
C
/* Test for ptsname/ptsname_r.
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Copyright (C) 2014-2017 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Aurelien Jarno <aurelien@aurel32.net>, 2014.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <errno.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#define DEV_TTY "/dev/tty"
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#define PTSNAME_EINVAL "./ptsname-einval"
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static int
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do_single_test (int fd, char *buf, size_t buflen, int expected_err)
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{
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int ret = ptsname_r (fd, buf, buflen);
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int err = errno;
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if (expected_err == 0)
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{
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if (ret != 0)
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{
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printf ("ptsname_r: expected: return = 0\n");
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printf (" got: return = %d, errno = %d (%s)\n",
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ret, err, strerror (err));
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return 1;
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}
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}
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else
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{
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if (ret == 0 || errno != expected_err)
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{
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printf ("ptsname_r: expected: return = %d, errno = %d (%s)\n",
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-1, expected_err, strerror (expected_err));
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printf (" got: return = %d, errno = %d (%s)\n",
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ret, err, strerror (err));
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return 1;
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}
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}
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return 0;
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}
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static int
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do_test (void)
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{
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char buf[512];
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int result = 0;
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/* Tests with a real PTS master. */
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int fd = posix_openpt (O_RDWR);
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if (fd != -1)
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{
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result |= do_single_test (fd, buf, sizeof (buf), 0);
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result |= do_single_test (fd, buf, 1, ERANGE);
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close (fd);
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}
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else
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printf ("posix_openpt (O_RDWR) failed\nerrno %d (%s)\n",
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errno, strerror (errno));
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/* Test with a terminal device which is not a PTS master. */
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fd = open (DEV_TTY, O_RDONLY);
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if (fd != -1)
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{
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result |= do_single_test (fd, buf, sizeof (buf), ENOTTY);
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close (fd);
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}
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else
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printf ("open (\"%s\", O_RDWR) failed\nerrno %d (%s)\n",
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DEV_TTY, errno, strerror (errno));
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/* Test with a file. */
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fd = open (PTSNAME_EINVAL, O_RDWR | O_CREAT, 0600);
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if (fd != -1)
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{
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result |= do_single_test (fd, buf, sizeof (buf), ENOTTY);
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close (fd);
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unlink (PTSNAME_EINVAL);
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}
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else
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printf ("open (\"%s\", O_RDWR | OCREAT) failed\nerrno %d (%s)\n",
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PTSNAME_EINVAL, errno, strerror (errno));
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return result;
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}
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#define TEST_FUNCTION do_test ()
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#include "../test-skeleton.c"
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