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/*
* Check decoding of NS_MNT_GET_{INFO,NEXT,PREV} commands of ioctl syscall.
*
* Copyright (c) 2017-2024 The strace developers.
* All rights reserved.
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "tests.h"
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <linux/ioctl.h>
#include <linux/nsfs.h>
int
main(void)
{
static const char mnt_path[] = "/proc/self/ns/mnt";
static const struct strval32 ops[] = {
{ ARG_STR(NS_MNT_GET_INFO) },
{ ARG_STR(NS_MNT_GET_NEXT) },
{ ARG_STR(NS_MNT_GET_PREV) },
{ ARG_STR(_IOC(_IOC_READ, 0xb7, 0xff, 0x10)) },
};
TAIL_ALLOC_OBJECT_CONST_PTR(struct mnt_ns_info, info);
int fd = open(mnt_path, O_RDONLY);
if (fd < 0)
perror_msg_and_skip("open: %s", mnt_path);
for (size_t i = 0; i < ARRAY_SIZE(ops); ++i) {
int rc = ioctl(-1, ops[i].val, info);
printf("ioctl(-1, %s, %p) = %s\n",
ops[i].str, info, sprintrc(rc));
rc = ioctl(fd, ops[i].val, info);
printf("ioctl(%d, %s, ", fd, ops[i].str);
if (rc < 0) {
printf("%p) = %s\n",
info, sprintrc(rc));
} else {
printf("{size=%u, nr_mounts=%u, mnt_ns_id=%#llx})"
" = %d\n",
info->size, info->nr_mounts,
(unsigned long long) info->mnt_ns_id, rc);
}
int code = _IOC(_IOC_READ, NSIO, _IOC_NR(ops[i].val),
MNT_NS_INFO_SIZE_VER0 - 1);
rc = ioctl(fd, code, info);
printf("ioctl(%d, _IOC(_IOC_READ, %#x, %#x, %#x), %p) = %s\n",
fd, NSIO, _IOC_NR(code), _IOC_SIZE(code),
info, sprintrc(rc));
code = _IOC(_IOC_READ, NSIO, _IOC_NR(ops[i].val),
sizeof(*info) + 1);
rc = ioctl(fd, code, info);
printf("ioctl(%d, _IOC(_IOC_READ, %#x, %#x, %#x), ",
fd, NSIO, _IOC_NR(code), _IOC_SIZE(code));
if (rc < 0) {
printf("%p) = %s\n",
info, sprintrc(rc));
} else {
printf("{size=%u, nr_mounts=%u, mnt_ns_id=%#llx})"
" = %d\n",
info->size, info->nr_mounts,
(unsigned long long) info->mnt_ns_id, rc);
}
}
close(fd);
puts("+++ exited with 0 +++");
return 0;
}
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