samples/vfs/test-statx.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /* Test the statx() system call.
   3  *
   4  * Note that the output of this program is intended to look like the output of
   5  * /bin/stat where possible.
   6  *
   7  * Copyright (C) 2015 Red Hat, Inc. All Rights Reserved.
   8  * Written by David Howells (dhowells@redhat.com)
   9  */
  10
  11 #define _GNU_SOURCE
  12 #define _ATFILE_SOURCE
  13 #include <stdio.h>
  14 #include <stdlib.h>
  15 #include <string.h>
  16 #include <unistd.h>
  17 #include <ctype.h>
  18 #include <errno.h>
  19 #include <time.h>
  20 #include <sys/syscall.h>
  21 #include <sys/types.h>
  22 #include <linux/stat.h>
  23 #include <linux/fcntl.h>
  24 #define statx foo
  25 #define statx_timestamp foo_timestamp
  26 struct statx;
  27 struct statx_timestamp;
  28 #include <sys/stat.h>
  29 #undef statx
  30 #undef statx_timestamp
  31
  32 #define AT_STATX_SYNC_TYPE      0x6000
  33 #define AT_STATX_SYNC_AS_STAT   0x0000
  34 #define AT_STATX_FORCE_SYNC     0x2000
  35 #define AT_STATX_DONT_SYNC      0x4000
  36
  37 #ifndef __NR_statx
  38 #define __NR_statx -1
  39 #endif
  40
  41 static __attribute__((unused))
  42 ssize_t statx(int dfd, const char *filename, unsigned flags,
  43               unsigned int mask, struct statx *buffer)
  44 {
  45         return syscall(__NR_statx, dfd, filename, flags, mask, buffer);
  46 }
  47
  48 static void print_time(const char *field, struct statx_timestamp *ts)
  49 {
  50         struct tm tm;
  51         time_t tim;
  52         char buffer[100];
  53         int len;
  54
  55         tim = ts->tv_sec;
  56         if (!localtime_r(&tim, &tm)) {
  57                 perror("localtime_r");
  58                 exit(1);
  59         }
  60         len = strftime(buffer, 100, "%F %T", &tm);
  61         if (len == 0) {
  62                 perror("strftime");
  63                 exit(1);
  64         }
  65         printf("%s", field);
  66         fwrite(buffer, 1, len, stdout);
  67         printf(".%09u", ts->tv_nsec);
  68         len = strftime(buffer, 100, "%z", &tm);
  69         if (len == 0) {
  70                 perror("strftime2");
  71                 exit(1);
  72         }
  73         fwrite(buffer, 1, len, stdout);
  74         printf("\n");
  75 }
  76
  77 static void dump_statx(struct statx *stx)
  78 {
  79         char buffer[256], ft = '?';
  80
  81         printf("results=%x\n", stx->stx_mask);
  82
  83         printf(" ");
  84         if (stx->stx_mask & STATX_SIZE)
  85                 printf(" Size: %-15llu", (unsigned long long)stx->stx_size);
  86         if (stx->stx_mask & STATX_BLOCKS)
  87                 printf(" Blocks: %-10llu", (unsigned long long)stx->stx_blocks);
  88         printf(" IO Block: %-6llu", (unsigned long long)stx->stx_blksize);
  89         if (stx->stx_mask & STATX_TYPE) {
  90                 switch (stx->stx_mode & S_IFMT) {
  91                 case S_IFIFO:   printf("  FIFO\n");                     ft = 'p'; break;
  92                 case S_IFCHR:   printf("  character special file\n");   ft = 'c'; break;
  93                 case S_IFDIR:   printf("  directory\n");                ft = 'd'; break;
  94                 case S_IFBLK:   printf("  block special file\n");       ft = 'b'; break;
  95                 case S_IFREG:   printf("  regular file\n");             ft = '-'; break;
  96                 case S_IFLNK:   printf("  symbolic link\n");            ft = 'l'; break;
  97                 case S_IFSOCK:  printf("  socket\n");                   ft = 's'; break;
  98                 default:
  99                         printf(" unknown type (%o)\n", stx->stx_mode & S_IFMT);
 100                         break;
 101                 }
 102         } else {
 103                 printf(" no type\n");
 104         }
 105
 106         sprintf(buffer, "%02x:%02x", stx->stx_dev_major, stx->stx_dev_minor);
 107         printf("Device: %-15s", buffer);
 108         if (stx->stx_mask & STATX_INO)
 109                 printf(" Inode: %-11llu", (unsigned long long) stx->stx_ino);
 110         if (stx->stx_mask & STATX_NLINK)
 111                 printf(" Links: %-5u", stx->stx_nlink);
 112         if (stx->stx_mask & STATX_TYPE) {
 113                 switch (stx->stx_mode & S_IFMT) {
 114                 case S_IFBLK:
 115                 case S_IFCHR:
 116                         printf(" Device type: %u,%u",
 117                                stx->stx_rdev_major, stx->stx_rdev_minor);
 118                         break;
 119                 }
 120         }
 121         printf("\n");
 122
 123         if (stx->stx_mask & STATX_MODE)
 124                 printf("Access: (%04o/%c%c%c%c%c%c%c%c%c%c)  ",
 125                        stx->stx_mode & 07777,
 126                        ft,
 127                        stx->stx_mode & S_IRUSR ? 'r' : '-',
 128                        stx->stx_mode & S_IWUSR ? 'w' : '-',
 129                        stx->stx_mode & S_IXUSR ? 'x' : '-',
 130                        stx->stx_mode & S_IRGRP ? 'r' : '-',
 131                        stx->stx_mode & S_IWGRP ? 'w' : '-',
 132                        stx->stx_mode & S_IXGRP ? 'x' : '-',
 133                        stx->stx_mode & S_IROTH ? 'r' : '-',
 134                        stx->stx_mode & S_IWOTH ? 'w' : '-',
 135                        stx->stx_mode & S_IXOTH ? 'x' : '-');
 136         if (stx->stx_mask & STATX_UID)
 137                 printf("Uid: %5d   ", stx->stx_uid);
 138         if (stx->stx_mask & STATX_GID)
 139                 printf("Gid: %5d\n", stx->stx_gid);
 140
 141         if (stx->stx_mask & STATX_ATIME)
 142                 print_time("Access: ", &stx->stx_atime);
 143         if (stx->stx_mask & STATX_MTIME)
 144                 print_time("Modify: ", &stx->stx_mtime);
 145         if (stx->stx_mask & STATX_CTIME)
 146                 print_time("Change: ", &stx->stx_ctime);
 147         if (stx->stx_mask & STATX_BTIME)
 148                 print_time(" Birth: ", &stx->stx_btime);
 149
 150         if (stx->stx_attributes_mask) {
 151                 unsigned char bits, mbits;
 152                 int loop, byte;
 153
 154                 static char attr_representation[64 + 1] =
 155                         /* STATX_ATTR_ flags: */
 156                         "????????"      /* 63-56 */
 157                         "????????"      /* 55-48 */
 158                         "????????"      /* 47-40 */
 159                         "????????"      /* 39-32 */
 160                         "????????"      /* 31-24        0x00000000-ff000000 */
 161                         "????????"      /* 23-16        0x00000000-00ff0000 */
 162                         "???me???"      /* 15- 8        0x00000000-0000ff00 */
 163                         "?dai?c??"      /*  7- 0        0x00000000-000000ff */
 164                         ;
 165
 166                 printf("Attributes: %016llx (",
 167                        (unsigned long long)stx->stx_attributes);
 168                 for (byte = 64 - 8; byte >= 0; byte -= 8) {
 169                         bits = stx->stx_attributes >> byte;
 170                         mbits = stx->stx_attributes_mask >> byte;
 171                         for (loop = 7; loop >= 0; loop--) {
 172                                 int bit = byte + loop;
 173
 174                                 if (!(mbits & 0x80))
 175                                         putchar('.');   /* Not supported */
 176                                 else if (bits & 0x80)
 177                                         putchar(attr_representation[63 - bit]);
 178                                 else
 179                                         putchar('-');   /* Not set */
 180                                 bits <<= 1;
 181                                 mbits <<= 1;
 182                         }
 183                         if (byte)
 184                                 putchar(' ');
 185                 }
 186                 printf(")\n");
 187         }
 188 }
 189
 190 static void dump_hex(unsigned long long *data, int from, int to)
 191 {
 192         unsigned offset, print_offset = 1, col = 0;
 193
 194         from /= 8;
 195         to = (to + 7) / 8;
 196
 197         for (offset = from; offset < to; offset++) {
 198                 if (print_offset) {
 199                         printf("%04x: ", offset * 8);
 200                         print_offset = 0;
 201                 }
 202                 printf("%016llx", data[offset]);
 203                 col++;
 204                 if ((col & 3) == 0) {
 205                         printf("\n");
 206                         print_offset = 1;
 207                 } else {
 208                         printf(" ");
 209                 }
 210         }
 211
 212         if (!print_offset)
 213                 printf("\n");
 214 }
 215
 216 int main(int argc, char **argv)
 217 {
 218         struct statx stx;
 219         int ret, raw = 0, atflag = AT_SYMLINK_NOFOLLOW;
 220
 221         unsigned int mask = STATX_ALL;
 222
 223         for (argv++; *argv; argv++) {
 224                 if (strcmp(*argv, "-F") == 0) {
 225                         atflag &= ~AT_STATX_SYNC_TYPE;
 226                         atflag |= AT_STATX_FORCE_SYNC;
 227                         continue;
 228                 }
 229                 if (strcmp(*argv, "-D") == 0) {
 230                         atflag &= ~AT_STATX_SYNC_TYPE;
 231                         atflag |= AT_STATX_DONT_SYNC;
 232                         continue;
 233                 }
 234                 if (strcmp(*argv, "-L") == 0) {
 235                         atflag &= ~AT_SYMLINK_NOFOLLOW;
 236                         continue;
 237                 }
 238                 if (strcmp(*argv, "-O") == 0) {
 239                         mask &= ~STATX_BASIC_STATS;
 240                         continue;
 241                 }
 242                 if (strcmp(*argv, "-A") == 0) {
 243                         atflag |= AT_NO_AUTOMOUNT;
 244                         continue;
 245                 }
 246                 if (strcmp(*argv, "-R") == 0) {
 247                         raw = 1;
 248                         continue;
 249                 }
 250
 251                 memset(&stx, 0xbf, sizeof(stx));
 252                 ret = statx(AT_FDCWD, *argv, atflag, mask, &stx);
 253                 printf("statx(%s) = %d\n", *argv, ret);
 254                 if (ret < 0) {
 255                         perror(*argv);
 256                         exit(1);
 257                 }
 258
 259                 if (raw)
 260                         dump_hex((unsigned long long *)&stx, 0, sizeof(stx));
 261
 262                 dump_statx(&stx);
 263         }
 264         return 0;
 265 }