xref: /dragonfly/lib/libc/sys/stat.2 (revision 409b4c59)
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32.\"     @(#)stat.2	8.4 (Berkeley) 5/1/95
33.\" $FreeBSD: src/lib/libc/sys/stat.2,v 1.16.2.7 2001/12/14 18:34:01 ru Exp $
34.\" $DragonFly: src/lib/libc/sys/stat.2,v 1.6 2008/09/28 16:33:35 swildner Exp $
35.\"
36.Dd September 28, 2008
37.Dt STAT 2
38.Os
39.Sh NAME
40.Nm stat ,
41.Nm lstat ,
42.Nm fstat
43.Nd get file status
44.Sh LIBRARY
45.Lb libc
46.Sh SYNOPSIS
47.In sys/types.h
48.In sys/stat.h
49.Ft int
50.Fn stat "const char *path" "struct stat *sb"
51.Ft int
52.Fn lstat "const char *path" "struct stat *sb"
53.Ft int
54.Fn fstat "int fd" "struct stat *sb"
55.Sh DESCRIPTION
56The
57.Fn stat
58function obtains information about the file pointed to by
59.Fa path .
60Read, write or execute
61permission of the named file is not required, but all directories
62listed in the path name leading to the file must be searchable.
63.Pp
64.Fn Lstat
65is like
66.Fn stat
67except in the case where the named file is a symbolic link,
68in which case
69.Fn lstat
70returns information about the link,
71while
72.Fn stat
73returns information about the file the link references.
74.Pp
75The
76.Fn fstat
77obtains the same information about an open file
78known by the file descriptor
79.Fa fd .
80.Pp
81The
82.Fa sb
83argument is a pointer to a
84.Fn stat
85structure
86as defined by
87.In sys/stat.h
88(shown below)
89and into which information is placed concerning the file.
90.Bd -literal
91struct stat {
92    dev_t     st_dev;               /* inode's device */
93    ino_t     st_ino;               /* inode's number */
94    mode_t    st_mode;              /* inode protection mode */
95    nlink_t   st_nlink;             /* number of hard links */
96    uid_t     st_uid;               /* user ID of the file's owner */
97    gid_t     st_gid;               /* group ID of the file's group */
98    dev_t     st_rdev;              /* device type */
99#ifndef _POSIX_SOURCE
100    struct timespec st_atimespec;  /* time of last access */
101    struct timespec st_mtimespec;  /* time of last data modification */
102    struct timespec st_ctimespec;  /* time of last file status change */
103#else
104    time_t    st_atime;             /* time of last access */
105    long      st_atimensec;         /* nsec of last access */
106    time_t    st_mtime;             /* time of last data modification */
107    long      st_mtimensec;         /* nsec of last data modification */
108    time_t    st_ctime;             /* time of last file status change */
109    long      st_ctimensec;         /* nsec of last file status change */
110#endif
111    off_t     st_size;              /* file size, in bytes */
112    int64_t   st_blocks;            /* blocks allocated for file */
113    u_int32_t st_blksize;           /* optimal blocksize for I/O */
114    u_int32_t st_flags;             /* user defined flags for file */
115    u_int32_t st_gen;               /* file generation number */
116};
117.Ed
118.Pp
119The time-related fields of
120.Fa struct stat
121are as follows:
122.Bl -tag -width XXXst_mtime
123.It st_atime
124Time when file data last accessed.
125Changed by the
126.Xr execve 2 ,
127.Xr mknod 2 ,
128.Xr mmap 2 ,
129.Xr read 2
130and
131.Xr utimes 2
132system calls.
133.It st_mtime
134Time when file data last modified.
135Changed by the
136.Xr mknod 2 ,
137.Xr utimes 2
138and
139.Xr write 2
140system calls.
141.It st_ctime
142Time when file status was last changed (inode data modification).
143Changed by the
144.Xr chmod 2 ,
145.Xr chown 2 ,
146.Xr link 2 ,
147.Xr mknod 2 ,
148.Xr rename 2 ,
149.Xr unlink 2 ,
150.Xr utimes 2
151and
152.Xr write 2
153system calls.
154.El
155.Pp
156If
157.Dv _POSIX_SOURCE
158is not defined, the time-related fields are defined as:
159.Bd -literal
160#ifndef _POSIX_SOURCE
161#define st_atime st_atimespec.tv_sec
162#define st_mtime st_mtimespec.tv_sec
163#define st_ctime st_ctimespec.tv_sec
164#endif
165.Ed
166.Pp
167The size-related fields of the
168.Fa struct stat
169are as follows:
170.Bl -tag -width XXXst_blksize
171.It st_blksize
172The optimal I/O block size for the file.
173.It st_blocks
174The actual number of blocks allocated for the file in 512-byte units.
175As short symbolic links are stored in the inode, this number may
176be zero.
177.El
178.Pp
179The status information word
180.Fa st_mode
181has the following bits:
182.Bd -literal
183#define S_IFMT 0170000           /* type of file */
184#define        S_IFIFO  0010000  /* named pipe (fifo) */
185#define        S_IFCHR  0020000  /* character special */
186#define        S_IFDIR  0040000  /* directory */
187#define        S_IFBLK  0060000  /* block special */
188#define        S_IFREG  0100000  /* regular */
189#define        S_IFLNK  0120000  /* symbolic link */
190#define        S_IFSOCK 0140000  /* socket */
191#define        S_IFWHT  0160000  /* whiteout */
192#define S_ISUID 0004000  /* set user id on execution */
193#define S_ISGID 0002000  /* set group id on execution */
194#define S_ISVTX 0001000  /* save swapped text even after use */
195#define S_IRUSR 0000400  /* read permission, owner */
196#define S_IWUSR 0000200  /* write permission, owner */
197#define S_IXUSR 0000100  /* execute/search permission, owner */
198.Ed
199.Pp
200For a list of access modes, see
201.In sys/stat.h ,
202.Xr access 2
203and
204.Xr chmod 2 .
205.Sh RETURN VALUES
206.Rv -std
207.Sh COMPATIBILITY
208Previous versions of the system used different types for the
209.Li st_dev ,
210.Li st_uid ,
211.Li st_gid ,
212.Li st_rdev ,
213.Li st_size ,
214.Li st_blksize
215and
216.Li st_blocks
217fields.
218.Sh ERRORS
219.Fn Stat
220and
221.Fn lstat
222will fail if:
223.Bl -tag -width Er
224.It Bq Er EACCES
225Search permission is denied for a component of the path prefix.
226.It Bq Er EIO
227An I/O error occurred while reading from or writing to the file system.
228.It Bq Er ELOOP
229Too many symbolic links were encountered in translating the pathname.
230.It Bq Er ENAMETOOLONG
231A component of a pathname exceeded 255 characters,
232or an entire path name exceeded 1023 characters.
233.It Bq Er ENOENT
234The named file does not exist.
235.It Bq Er ENOTDIR
236A component of the path prefix is not a directory.
237.It Bq Er EFAULT
238.Fa sb
239or
240.Em name
241points to an invalid address.
242.El
243.Pp
244.Fn Fstat
245will fail if:
246.Bl -tag -width Er
247.It Bq Er EBADF
248.Fa fd
249is not a valid open file descriptor.
250.It Bq Er EFAULT
251.Fa sb
252points to an invalid address.
253.It Bq Er EIO
254An I/O error occurred while reading from or writing to the file system.
255.El
256.Sh SEE ALSO
257.Xr access 2 ,
258.Xr chmod 2 ,
259.Xr chown 2 ,
260.Xr statfs 2 ,
261.Xr statvfs 2 ,
262.Xr utimes 2 ,
263.Xr symlink 7
264.Sh STANDARDS
265The
266.Fn stat
267and
268.Fn fstat
269function calls are expected to conform to
270.St -p1003.1-90 .
271.Sh HISTORY
272A
273.Fn stat
274and a
275.Fn fstat
276function call appeared in
277.At v7 .
278A
279.Fn lstat
280function call appeared in
281.Bx 4.2 .
282.Sh BUGS
283Applying
284.Fn fstat
285to a socket (and thus to a pipe)
286returns a zeroed buffer,
287except for the blocksize field,
288and a unique device and inode number.
289