xref: /openbmc/linux/samples/vfs/test-statx.c (revision 82df5b73) 
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_BASIC_STATS | STATX_BTIME;
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 }
264