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/*
* Check decoding of set_mempolicy syscall.
*
* Copyright (c) 2016 Dmitry V. Levin <ldv@altlinux.org>
* Copyright (c) 2016-2018 The strace developers.
* All rights reserved.
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "tests.h"
#include <asm/unistd.h>
#ifdef __NR_set_mempolicy
# include <errno.h>
# include <stdio.h>
# include <string.h>
# include <unistd.h>
# include "xlat.h"
# include "xlat/policies.h"
# define MAX_STRLEN 3
# define NLONGS(n) ((n + 8 * sizeof(long) - 2) \
/ (8 * sizeof(long)))
static void
print_nodes(const unsigned long maxnode, unsigned int offset)
{
unsigned int nlongs = NLONGS(maxnode);
if (nlongs <= offset)
nlongs = 0;
else
nlongs -= offset;
const unsigned int size = nlongs * sizeof(long);
unsigned long *const nodemask =
tail_alloc(size ? size : (offset ? 1 : 0));
memset(nodemask, 0, size);
long rc = syscall(__NR_set_mempolicy, 0, nodemask, maxnode);
const char *errstr = sprintrc(rc);
fputs("set_mempolicy(MPOL_DEFAULT, ", stdout);
if (nlongs) {
putc('[', stdout);
unsigned int i;
for (i = 0; i < nlongs + offset; ++i) {
if (i)
fputs(", ", stdout);
if (i < nlongs) {
if (i >= MAX_STRLEN) {
fputs("...", stdout);
break;
}
printf("%#0*lx", (int) sizeof(long) * 2 + 2,
nodemask[i]);
} else {
printf("... /* %p */", nodemask + i);
break;
}
}
putc(']', stdout);
} else {
if (maxnode)
printf("%p", nodemask);
else
printf("[]");
}
printf(", %lu) = %s\n", maxnode, errstr);
}
static void
test_offset(const unsigned int offset)
{
unsigned long maxnode = get_page_size() * 8;
print_nodes(maxnode, offset);
print_nodes(maxnode + 1, offset);
print_nodes(maxnode + 2, offset);
maxnode = sizeof(long) * 8;
print_nodes(0, offset);
print_nodes(1, offset);
print_nodes(2, offset);
print_nodes(maxnode - 1, offset);
print_nodes(maxnode , offset);
print_nodes(maxnode + 1, offset);
print_nodes(maxnode + 2, offset);
print_nodes(maxnode * 2 - 1, offset);
print_nodes(maxnode * 2 , offset);
print_nodes(maxnode * 2 + 1, offset);
print_nodes(maxnode * 2 + 2, offset);
print_nodes(maxnode * 3 - 1, offset);
print_nodes(maxnode * 3 , offset);
print_nodes(maxnode * 3 + 1, offset);
print_nodes(maxnode * 3 + 2, offset);
print_nodes(maxnode * 4 + 2, offset);
}
int
main(void)
{
if (syscall(__NR_set_mempolicy, 0, 0, 0))
perror_msg_and_skip("set_mempolicy");
puts("set_mempolicy(MPOL_DEFAULT, NULL, 0) = 0");
const unsigned long *nodemask = (void *) 0xfacefeedfffffffeULL;
const unsigned long maxnode = (unsigned long) 0xcafef00dbadc0dedULL;
long rc = syscall(__NR_set_mempolicy, 1, nodemask, maxnode);
printf("set_mempolicy(MPOL_PREFERRED, %p, %lu) = %s\n",
nodemask, maxnode, sprintrc(rc));
test_offset(0);
test_offset(1);
puts("+++ exited with 0 +++");
return 0;
}
#else
SKIP_MAIN_UNDEFINED("__NR_set_mempolicy")
#endif
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