samples/statx/test-statx.c

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