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28 .\" @(#)stat.2 8.4 (Berkeley) 5/1/95
45 .Fn stat "const char * restrict path" "struct stat * restrict sb"
47 .Fn lstat "const char * restrict path" "struct stat * restrict sb"
49 .Fn fstat "int fd" "struct stat *sb"
51 .Fn fstatat "int fd" "const char *path" "struct stat *buf" "int flag"
55 system call obtains information about the file pointed to by
57 Read, write or execute
58 permission of the named file is not required, but all directories
59 listed in the path name leading to the file must be searchable.
65 except in the case where the named file is a symbolic link,
68 returns information about the link,
71 returns information about the file the link references.
75 system call obtains the same information about an open file
76 known by the file descriptor
81 system call is equivalent to
85 except in the case where the
87 specifies a relative path.
88 In this case the status is retrieved from a file relative to
89 the directory associated with the file descriptor
91 instead of the current working directory.
95 are constructed by a bitwise-inclusive OR of flags from the following list,
98 .Bl -tag -width indent
99 .It Dv AT_SYMLINK_NOFOLLOW
102 names a symbolic link, the status of the symbolic link is returned.
107 is passed the special value
111 parameter, the current working directory is used and the behavior is
112 identical to a call to
116 respectively, depending on whether or not the
117 .Dv AT_SYMLINK_NOFOLLOW
123 argument is a pointer to a
128 and into which information is placed concerning the file.
132 related to the file system are as follows:
133 .Bl -tag -width ".Va st_nlink"
135 The numeric ID of the device containing the file.
137 The file's inode number.
139 The number of hard links to the file.
146 fields together identify the file uniquely within the system.
148 The time-related fields of
151 .Bl -tag -width ".Va st_birthtim"
153 Time when file data last accessed.
162 Time when file data last modified.
173 Time when file status was last changed (inode data modification).
194 Time when the inode was created.
197 The following time-related macros are defined for compatibility:
199 #define st_atime st_atim.tv_sec
200 #define st_mtime st_mtim.tv_sec
201 #define st_ctime st_ctim.tv_sec
202 #ifndef _POSIX_SOURCE
203 #define st_birthtime st_birthtim.tv_sec
206 #ifndef _POSIX_SOURCE
207 #define st_atimespec st_atim
208 #define st_mtimespec st_mtim
209 #define st_ctimespec st_ctim
210 #define st_birthtimespec st_birthtim
214 The size-related fields of the
217 .Bl -tag -width ".Va st_blksize"
219 The file size in bytes.
221 The optimal I/O block size for the file.
223 The actual number of blocks allocated for the file in 512-byte units.
224 As short symbolic links are stored in the inode, this number may
228 The access-related fields of
231 .Bl -tag -width ".Va st_mode"
233 The user ID of the file's owner.
235 The group ID of the file.
237 Status of the file (see below).
240 The status information word
242 has the following bits:
244 #define S_IFMT 0170000 /* type of file mask */
245 #define S_IFIFO 0010000 /* named pipe (fifo) */
246 #define S_IFCHR 0020000 /* character special */
247 #define S_IFDIR 0040000 /* directory */
248 #define S_IFBLK 0060000 /* block special */
249 #define S_IFREG 0100000 /* regular */
250 #define S_IFLNK 0120000 /* symbolic link */
251 #define S_IFSOCK 0140000 /* socket */
252 #define S_IFWHT 0160000 /* whiteout */
253 #define S_ISUID 0004000 /* set user id on execution */
254 #define S_ISGID 0002000 /* set group id on execution */
255 #define S_ISVTX 0001000 /* save swapped text even after use */
256 #define S_IRWXU 0000700 /* RWX mask for owner */
257 #define S_IRUSR 0000400 /* read permission, owner */
258 #define S_IWUSR 0000200 /* write permission, owner */
259 #define S_IXUSR 0000100 /* execute/search permission, owner */
260 #define S_IRWXG 0000070 /* RWX mask for group */
261 #define S_IRGRP 0000040 /* read permission, group */
262 #define S_IWGRP 0000020 /* write permission, group */
263 #define S_IXGRP 0000010 /* execute/search permission, group */
264 #define S_IRWXO 0000007 /* RWX mask for other */
265 #define S_IROTH 0000004 /* read permission, other */
266 #define S_IWOTH 0000002 /* write permission, other */
267 #define S_IXOTH 0000001 /* execute/search permission, other */
270 For a list of access modes, see
275 The following macros are available to test whether a
279 argument corresponds to a file of the specified type:
280 .Bl -tag -width ".Fn S_ISFIFO m"
282 Test for a block special file.
284 Test for a character special file.
286 Test for a directory.
288 Test for a pipe or FIFO special file.
290 Test for a symbolic link.
292 Test for a regular file.
299 The macros evaluate to a non-zero value if the test is true
300 or to the value 0 if the test is false.
304 Previous versions of the system used different types for the
319 system calls will fail if:
322 Search permission is denied for a component of the path prefix.
329 points to an invalid address.
331 An I/O error occurred while reading from or writing to the file system.
333 Too many symbolic links were encountered in translating the pathname.
334 .It Bq Er ENAMETOOLONG
335 A component of a pathname exceeded 255 characters,
336 or an entire path name exceeded 1023 characters.
338 The named file does not exist.
340 A component of the path prefix is not a directory.
342 The file size in bytes cannot be
343 represented correctly in the structure pointed to by
349 system call will fail if:
355 is not a valid open file descriptor.
360 points to an invalid address.
362 An I/O error occurred while reading from or writing to the file system.
364 The file size in bytes cannot be
365 represented correctly in the structure pointed to by
369 In addition to the errors returned by the
378 argument does not specify an absolute path and the
382 nor a valid file descriptor open for searching.
386 argument is not valid.
390 argument is not an absolute path and
394 nor a file descriptor associated with a directory.
410 system calls are expected to conform to
414 system call follows The Open Group Extended API Set 2 specification.
420 system calls appeared in
424 system call appeared in
428 system call appeared in
434 returns a zeroed buffer,
435 except for the blocksize field,
436 and a unique device and inode number.