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/*
* Check decoding of userfaultfd syscall.
*
* Copyright (c) 2015-2018 Dmitry V. Levin <ldv@strace.io>
* Copyright (c) 2015-2024 The strace developers.
* All rights reserved.
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "tests.h"
#include "scno.h"
#include <stdio.h>
#include <unistd.h>
#include "kernel_fcntl.h"
#define UFFD_USER_MODE_ONLY 1
static const char *errstr;
static long
k_userfaultfd(const unsigned int flags)
{
const kernel_ulong_t fill = (kernel_ulong_t) 0xdefaced00000000ULL;
const kernel_ulong_t bad = (kernel_ulong_t) 0xbadc0dedbadc0dedULL;
const kernel_ulong_t arg1 = fill | flags;
const long rc = syscall(__NR_userfaultfd, arg1, bad, bad, bad, bad, bad);
errstr = sprintrc(rc);
return rc;
}
int
main(void)
{
static const struct strval32 flags[] = {
{ ARG_STR(0) },
{ ARG_STR(O_NONBLOCK) },
{ ARG_STR(O_CLOEXEC) },
{ ARG_STR(O_NONBLOCK|O_CLOEXEC) },
{ ARG_STR(UFFD_USER_MODE_ONLY) },
{ ARG_STR(UFFD_USER_MODE_ONLY|O_NONBLOCK) },
{ ARG_STR(UFFD_USER_MODE_ONLY|O_CLOEXEC) },
{ ARG_STR(UFFD_USER_MODE_ONLY|O_NONBLOCK|O_CLOEXEC) },
};
for (unsigned int i = 0; i < ARRAY_SIZE(flags); ++i) {
k_userfaultfd(flags[i].val);
printf("userfaultfd(%s) = %s\n", flags[i].str, errstr);
}
k_userfaultfd(-1U);
printf("userfaultfd(UFFD_USER_MODE_ONLY|O_NONBLOCK|O_CLOEXEC|%#x)"
" = %s\n", (-1U - UFFD_USER_MODE_ONLY - O_NONBLOCK - O_CLOEXEC),
errstr);
puts("+++ exited with 0 +++");
return 0;
}
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