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b3a6bd625c
Linux 6.13 was released with a change that overwrites those bytes. This means that the check_unused subtest fails. Update the manual accordingly. Tested-by: Xi Ruoyao <xry111@xry111.site> Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
97 lines
3.2 KiB
C
97 lines
3.2 KiB
C
/* Tests for sched_setattr and sched_getattr.
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Copyright (C) 2024-2025 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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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 License as
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published by the Free Software Foundation; either version 2.1 of the
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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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<https://www.gnu.org/licenses/>. */
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#include <sched.h>
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#include <errno.h>
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#include <stddef.h>
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#include <string.h>
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#include <support/check.h>
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#include <sys/resource.h>
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#include <unistd.h>
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/* Padding struct to detect unexpected writes. */
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union
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{
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struct sched_attr attr;
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/* Hopefully the kernel will never need as much. */
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unsigned char padding[4096];
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} u;
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static int
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do_test (void)
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{
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_Static_assert (SCHED_OTHER == SCHED_NORMAL,
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"SCHED_OTHER, SCHED_NORMAL values");
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TEST_VERIFY (sizeof (struct sched_attr) < sizeof (u));
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/* Check that reading and re-applying the current policy works. */
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memset (&u, 0xcc, sizeof (u));
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/* Compiler barrier to bypass write access attribute. */
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volatile unsigned int size = sizeof (u);
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TEST_COMPARE (sched_getattr (0, (struct sched_attr *) &u, size, 0), 0);
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TEST_COMPARE (sched_setattr (0, &u.attr, 0), 0); /* Apply unchanged. */
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/* Try to switch to the SCHED_OTHER policy. */
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memset (&u, 0, sizeof (u));
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u.attr.size = sizeof (u); /* With padding, kernel should accept zeroes. */
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u.attr.sched_policy = SCHED_OTHER; /* Should be the default. */
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{
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errno = 0;
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int prio = getpriority (PRIO_PROCESS, 0);
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if (errno != 0)
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prio = 0;
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u.attr.sched_nice = prio;
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}
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TEST_COMPARE (sched_setattr (0, &u.attr, 0), 0);
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/* Non-zero values not known to the kernel result in an E2BIG error. */
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memset (&u, 0, sizeof (u));
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TEST_COMPARE (sched_getattr (0, (struct sched_attr *) &u, size, 0), 0);
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u.padding[u.attr.size] = 0xcc;
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u.attr.size = sizeof (u);
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errno = 0;
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TEST_COMPARE (sched_setattr (0, &u.attr, 0), -1);
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TEST_COMPARE (errno, E2BIG);
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memset (&u, 0xcc, sizeof (u));
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TEST_COMPARE (sched_getattr (0, (struct sched_attr *) &u, size, 0), 0);
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TEST_COMPARE (u.attr.sched_policy, SCHED_OTHER);
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/* Raise the niceless level to 19 and observe its effect. */
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TEST_COMPARE (nice (19), 19);
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TEST_COMPARE (sched_getattr (0, &u.attr, sizeof (u.attr), 0), 0);
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TEST_COMPARE (u.attr.sched_policy, SCHED_OTHER);
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TEST_COMPARE (u.attr.sched_nice, 19);
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/* Invalid buffer arguments result in EINVAL (not EFAULT). */
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{
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errno = 0;
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void *volatile null_pointer = NULL; /* compiler barrier. */
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TEST_COMPARE (sched_setattr (0, null_pointer, 0), -1);
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TEST_COMPARE (errno, EINVAL);
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errno = 0;
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TEST_COMPARE (sched_getattr (0, null_pointer, size, 0), -1);
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TEST_COMPARE (errno, EINVAL);
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}
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return 0;
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}
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#include <support/test-driver.c>
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