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