linux/samples/vfs/test-statx.c
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   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
  26struct statx;
  27struct 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
  41static __attribute__((unused))
  42ssize_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
  48static 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
  77static 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
 190static 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
 216int 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_BASIC_STATS | STATX_BTIME;
 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}
 266