granicus.if.org Git - strace/blob - tests/madvise.c

   1 /*
   2  * Copyright (c) 2017 The strace developers.
   3  * All rights reserved.
   4  *
   5  * SPDX-License-Identifier: GPL-2.0-or-later
   6  */
   7
   8 #include "tests.h"
   9 #include <stdint.h>
  10 #include <stdio.h>
  11 #include <sys/mman.h>
  12 #include <unistd.h>
  13 #include <asm/unistd.h>
  14
  15 static const char *errstr;
  16
  17 static long
  18 k_madvise(const kernel_ulong_t addr,
  19           const kernel_ulong_t length,
  20           const kernel_ulong_t advice)
  21 {
  22         long rc = syscall(__NR_madvise, addr, length, advice);
  23         errstr = sprintrc(rc);
  24         return rc;
  25 }
  26
  27 int
  28 main(void)
  29 {
  30         const unsigned long length = get_page_size();
  31         void *const addr = tail_alloc(length);
  32         long rc;
  33
  34         rc = madvise(addr, length, MADV_NORMAL);
  35         printf("madvise(%p, %lu, MADV_NORMAL) = %s\n",
  36                addr, length, sprintrc(rc));
  37
  38         static const kernel_ulong_t advice =
  39                 (kernel_ulong_t) 0xfacefeed00000000ULL | MADV_RANDOM;
  40         rc = k_madvise((uintptr_t) addr, length, advice);
  41         printf("madvise(%p, %lu, MADV_RANDOM) = %s\n",
  42                addr, length, sprintrc(rc));
  43
  44         static const kernel_ulong_t bogus_length =
  45                 (kernel_ulong_t) 0xfffffffffffffaceULL;
  46         rc = k_madvise(0, bogus_length, MADV_SEQUENTIAL);
  47         printf("madvise(NULL, %llu, MADV_SEQUENTIAL) = %s\n",
  48                (unsigned long long) bogus_length, sprintrc(rc));
  49
  50         if (F8ILL_KULONG_SUPPORTED) {
  51                 rc = k_madvise(f8ill_ptr_to_kulong(addr), length, MADV_NORMAL);
  52                 printf("madvise(%#llx, %lu, MADV_NORMAL) = %s\n",
  53                        (unsigned long long) f8ill_ptr_to_kulong(addr),
  54                        length, sprintrc(rc));
  55         }
  56
  57         puts("+++ exited with 0 +++");
  58         return 0;
  59 }