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

   1 /*
   2  * Copyright (c) 2015-2016 Dmitry V. Levin <ldv@altlinux.org>
   3  * Copyright (c) 2015-2017 The strace developers.
   4  * All rights reserved.
   5  *
   6  * SPDX-License-Identifier: GPL-2.0-or-later
   7  */
   8
   9 #include "tests.h"
  10 #include <asm/unistd.h>
  11
  12 #ifdef __NR_getdents
  13
  14 # include <assert.h>
  15 # include <dirent.h>
  16 # include <fcntl.h>
  17 # include <stddef.h>
  18 # include <stdio.h>
  19 # include <sys/stat.h>
  20 # include <unistd.h>
  21
  22 static const char fname[] =
  23         "A\nA\nA\nA\nA\nA\nA\nA\nA\nA\nA\nA\nA\nA\nA\nA\n"
  24         "A\nA\nA\nA\nA\nA\nA\nA\nA\nA\nA\nA\nA\nA\nA\nA\n"
  25         "A\nA\nA\nA\nA\nA\nA\nA\nA\nA\nA\nA\nA\nA\nA\nA\n"
  26         "A\nA\nA\nA\nA\nA\nA\nA\nA\nA\nA\nA\nA\nA\nA\nA\n"
  27         "A\nA\nA\nA\nA\nA\nA\nA\nA\nA\nA\nA\nA\nA\nA\nA\n"
  28         "A\nA\nA\nA\nA\nA\nA\nA\nA\nA\nA\nA\nA\nA\nA\nA\n"
  29         "A\nA\nA\nA\nA\nA\nA\nA\nA\nA\nA\nA\nA\nA\nA\nA\n"
  30         "A\nA\nA\nA\nA\nA\nA\nA\nA\nA\nA\nA\nA\nA\nA\nZ";
  31 static const char qname[] =
  32         "A\\nA\\nA\\nA\\nA\\nA\\nA\\nA\\nA\\nA\\nA\\nA\\nA\\nA\\nA\\nA\\n"
  33         "A\\nA\\nA\\nA\\nA\\nA\\nA\\nA\\nA\\nA\\nA\\nA\\nA\\nA\\nA\\nA\\n"
  34         "A\\nA\\nA\\nA\\nA\\nA\\nA\\nA\\nA\\nA\\nA\\nA\\nA\\nA\\nA\\nA\\n"
  35         "A\\nA\\nA\\nA\\nA\\nA\\nA\\nA\\nA\\nA\\nA\\nA\\nA\\nA\\nA\\nA\\n"
  36         "A\\nA\\nA\\nA\\nA\\nA\\nA\\nA\\nA\\nA\\nA\\nA\\nA\\nA\\nA\\nA\\n"
  37         "A\\nA\\nA\\nA\\nA\\nA\\nA\\nA\\nA\\nA\\nA\\nA\\nA\\nA\\nA\\nA\\n"
  38         "A\\nA\\nA\\nA\\nA\\nA\\nA\\nA\\nA\\nA\\nA\\nA\\nA\\nA\\nA\\nA\\n"
  39         "A\\nA\\nA\\nA\\nA\\nA\\nA\\nA\\nA\\nA\\nA\\nA\\nA\\nA\\nA\\nZ";
  40
  41 static char buf[8192];
  42
  43 static const char *
  44 str_d_type(const unsigned char d_type)
  45 {
  46         switch (d_type) {
  47                 case DT_DIR:
  48                         return "DT_DIR";
  49                 case DT_REG:
  50                         return "DT_REG";
  51                 default:
  52                         return "DT_UNKNOWN";
  53         }
  54 }
  55 static void
  56 print_dirent(const kernel_dirent *d)
  57 {
  58         const unsigned int d_name_offset = offsetof(kernel_dirent, d_name);
  59         int d_name_len = d->d_reclen - d_name_offset - 1;
  60         assert(d_name_len > 0);
  61
  62         printf("{d_ino=%llu, d_off=%llu, d_reclen=%u, d_name=",
  63                (unsigned long long) d->d_ino,
  64                (unsigned long long) d->d_off, d->d_reclen);
  65
  66         if (d->d_name[0] == '.')
  67                 printf("\"%.*s\"", d_name_len, d->d_name);
  68         else
  69                 printf("\"%s\"", qname);
  70
  71         printf(", d_type=%s}",
  72                str_d_type(*((const char *) d + d->d_reclen - 1)));
  73 }
  74
  75 int
  76 main(void)
  77 {
  78         static const char dname[] = "getdents.test.tmp.dir";
  79
  80         assert(!mkdir(dname, 0700));
  81         assert(!chdir(dname));
  82         (void) close(0);
  83         assert(!creat(fname, 0600));
  84         assert(!close(0));
  85         assert(!open(".", O_RDONLY | O_DIRECTORY));
  86
  87         unsigned long count = (unsigned long) 0xfacefeeddeadbeefULL;
  88         long rc = syscall(__NR_getdents, (long) 0xdefacedffffffffULL, NULL,
  89                           count);
  90         printf("getdents(-1, NULL, %u) = %ld %s (%m)\n",
  91                (unsigned) count, rc, errno2name());
  92
  93         count = (unsigned long) 0xfacefeed00000000ULL | sizeof(buf);
  94         while ((rc = syscall(__NR_getdents, 0, buf, count))) {
  95                 kernel_dirent *d;
  96                 long i;
  97
  98                 if (rc < 0)
  99                         perror_msg_and_skip("getdents");
 100                 printf("getdents(0, [");
 101                 for (i = 0; i < rc; i += d->d_reclen) {
 102                         d = (kernel_dirent *) &buf[i];
 103                         if (i)
 104                                 printf(", ");
 105                         print_dirent(d);
 106                 }
 107                 printf("], %u) = %ld\n", (unsigned) count, rc);
 108         }
 109         printf("getdents(0, [], %u) = 0\n", (unsigned) count);
 110         puts("+++ exited with 0 +++");
 111         assert(!unlink(fname));
 112         assert(!chdir(".."));
 113         assert(!rmdir(dname));
 114
 115         return 0;
 116 }
 117
 118 #else
 119
 120 SKIP_MAIN_UNDEFINED("__NR_getdents")
 121
 122 #endif