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/*
* Check decoding of sched_getaffinity and sched_setaffinity syscalls.
*
* Copyright (c) 2016-2018 Dmitry V. Levin <ldv@strace.io>
* Copyright (c) 2016-2023 The strace developers.
* All rights reserved.
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "tests.h"
#include "scno.h"
#include "pidns.h"
#include <sched.h>
#if defined CPU_ISSET_S && defined CPU_ZERO_S && defined CPU_SET_S
# include <assert.h>
# include <errno.h>
# include <stdio.h>
# include <unistd.h>
static const char *errstr;
static int
getaffinity(unsigned long pid, unsigned long size, void *set)
{
int rc = syscall(__NR_sched_getaffinity, pid, size, set);
errstr = sprintrc(rc);
return rc;
}
static int
setaffinity(unsigned long pid, unsigned long size, void *set)
{
int rc = syscall(__NR_sched_setaffinity, pid, size, set);
errstr = sprintrc(rc);
return rc;
}
int
main(void)
{
PIDNS_TEST_INIT;
unsigned int cpuset_size = 1;
const pid_t pid = getpid();
const char *pid_str = pidns_pid2str(PT_TGID);
while (cpuset_size) {
assert(getaffinity(pid, cpuset_size, NULL) == -1);
if (EFAULT == errno)
break;
if (EINVAL != errno)
perror_msg_and_skip("sched_getaffinity");
pidns_print_leader();
printf("sched_getaffinity(%d%s, %u, NULL) = %s\n",
pid, pid_str, cpuset_size, errstr);
cpuset_size <<= 1;
}
assert(cpuset_size);
pidns_print_leader();
printf("sched_getaffinity(%d%s, %u, NULL) = %s\n",
pid, pid_str, cpuset_size, errstr);
cpu_set_t *cpuset = tail_alloc(cpuset_size);
getaffinity(pid, cpuset_size, cpuset + 1);
pidns_print_leader();
printf("sched_getaffinity(%d%s, %u, %p) = %s\n",
pid, pid_str, cpuset_size, cpuset + 1, errstr);
int ret_size = getaffinity(pid, cpuset_size, cpuset);
if (ret_size < 0)
perror_msg_and_fail("sched_getaffinity(%d, %u, %p) = %s\n",
pid, (unsigned) cpuset_size, cpuset, errstr);
assert(ret_size <= (int) cpuset_size);
pidns_print_leader();
printf("sched_getaffinity(%d%s, %u, [", pid, pid_str, cpuset_size);
const char *sep;
unsigned int i, cpu;
unsigned int first_cpu = -1U;
unsigned int first_crop_cpu = -1U;
for (i = 0, cpu = 0, sep = ""; i < (unsigned) ret_size * 8; ++i) {
if (CPU_ISSET_S(i, (unsigned) ret_size, cpuset)) {
printf("%s%u", sep, i);
sep = " ";
cpu = i;
if (first_cpu == -1U)
first_cpu = i;
if (first_crop_cpu == -1U && i >= 8)
first_crop_cpu = i;
}
}
printf("]) = %s\n", errstr);
long rc = setaffinity(pid, 0, ((char *) cpuset) + cpuset_size);
pidns_print_leader();
printf("sched_setaffinity(%d%s, 0, []) = %s\n",
pid, pid_str, sprintrc(rc));
rc = setaffinity(pid, 1, ((char *) cpuset) + cpuset_size);
pidns_print_leader();
printf("sched_setaffinity(%d%s, 1, %p) = %s\n",
pid, pid_str, ((char *) cpuset) + cpuset_size, sprintrc(rc));
static const uint8_t first_oob = BE_LE(SIZEOF_LONG == 4 ? 39 : 7, 56);
const unsigned int crop_size = 8;
cpu_set_t *crop_cpuset = tail_alloc(crop_size);
if (first_crop_cpu != -1U && first_crop_cpu < 56) {
CPU_ZERO_S(crop_size, crop_cpuset);
CPU_SET_S(first_crop_cpu, crop_size, crop_cpuset);
CPU_SET_S(first_oob, crop_size, crop_cpuset);
if (setaffinity(pid, crop_size - 1, crop_cpuset))
perror_msg_and_skip("sched_setaffinity()");
pidns_print_leader();
printf("sched_setaffinity(%d%s, 7, [%u]) = 0\n",
pid, pid_str, first_crop_cpu);
}
CPU_ZERO_S(cpuset_size, cpuset);
CPU_SET_S(cpu, cpuset_size, cpuset);
if (setaffinity(pid, cpuset_size, cpuset))
perror_msg_and_skip("sched_setaffinity");
pidns_print_leader();
printf("sched_setaffinity(%d%s, %u, [%u]) = 0\n",
pid, pid_str, cpuset_size, cpu);
const unsigned int big_size = cpuset_size < 128 ? 128 : cpuset_size * 2;
cpuset = tail_alloc(big_size);
ret_size = getaffinity(pid, big_size, cpuset);
if (ret_size < 0)
perror_msg_and_fail("sched_getaffinity(%d, %u, %p) = %s\n",
pid, big_size, cpuset, errstr);
assert(ret_size <= (int) big_size);
pidns_print_leader();
printf("sched_getaffinity(%d%s, %u, [", pid, pid_str, big_size);
for (i = 0, sep = ""; i < (unsigned) ret_size * 8; ++i) {
if (CPU_ISSET_S(i, (unsigned) ret_size, cpuset)) {
printf("%s%u", sep, i);
sep = " ";
}
}
printf("]) = %s\n", errstr);
pidns_print_leader();
puts("+++ exited with 0 +++");
return 0;
}
#else
SKIP_MAIN_UNDEFINED("CPU_ISSET_S && CPU_ZERO_S && CPU_SET_S")
#endif
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