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STAT(2)			    BSD	System Calls Manual		       STAT(2)

     stat, lstat, fstat	-- get file status

     Standard C	Library	(libc, -lc)

     #include <sys/types.h>
     #include <sys/stat.h>

     stat(const	char *path, struct stat	*sb);

     lstat(const char *path, struct stat *sb);

     fstat(int fd, struct stat *sb);

     The stat()	system call obtains information	about the file pointed to by
     path.  Read, write	or execute permission of the named file	is not re-
     quired, but all directories listed	in the path name leading to the	file
     must be searchable.

     The lstat() system	call is	like stat() except in the case where the named
     file is a symbolic	link, in which case lstat() returns information	about
     the link, while stat() returns information	about the file the link	refer-

     The fstat() system	call obtains the same information about	an open	file
     known by the file descriptor fd.

     The sb argument is	a pointer to a stat structure as defined by
     <sys/stat.h> and into which information is	placed concerning the file.

     The time-related fields of	struct stat are	as follows:

     st_atime	   Time	when file data last accessed.  Changed by the
		   mknod(2), utimes(2),	read(2)	and readv(2) system calls.

     st_mtime	   Time	when file data last modified.  Changed by the
		   mkdir(2), mkfifo(2),	mknod(2), utimes(2), write(2) and
		   writev(2) system calls.

     st_ctime	   Time	when file status was last changed (inode data modifi-
		   cation).  Changed by	the chflags(2),	chmod(2), chown(2),
		   creat(2), link(2), mkdir(2),	mkfifo(2), mknod(2),
		   rename(2), rmdir(2),	symlink(2), truncate(2), unlink(2),
		   utimes(2), write(2) and writev(2) system calls.

     st_birthtime  Time	when the inode was created.

     If	_POSIX_SOURCE is not defined, the time-related fields are defined as:

     #ifndef _POSIX_SOURCE
     #define st_atime st_atimespec.tv_sec
     #define st_mtime st_mtimespec.tv_sec
     #define st_ctime st_ctimespec.tv_sec

     The size-related fields of	the struct stat	are as follows:

     st_blksize	    The	optimal	I/O block size for the file.

     st_blocks	    The	actual number of blocks	allocated for the file in
		    512-byte units.  As	short symbolic links are stored	in the
		    inode, this	number may be zero.

     The status	information word st_mode has the following bits:

     #define S_IFMT   0170000  /* type of file */
     #define S_IFIFO  0010000  /* named	pipe (fifo) */
     #define S_IFCHR  0020000  /* character special */
     #define S_IFDIR  0040000  /* directory */
     #define S_IFBLK  0060000  /* block	special	*/
     #define S_IFREG  0100000  /* regular */
     #define S_IFLNK  0120000  /* symbolic link	*/
     #define S_IFSOCK 0140000  /* socket */
     #define S_IFWHT  0160000  /* whiteout */
     #define S_ISUID  0004000  /* set user id on execution */
     #define S_ISGID  0002000  /* set group id on execution */
     #define S_ISVTX  0001000  /* save swapped text even after use */
     #define S_IRUSR  0000400  /* read permission, owner */
     #define S_IWUSR  0000200  /* write	permission, owner */
     #define S_IXUSR  0000100  /* execute/search permission, owner */

     For a list	of access modes, see <sys/stat.h>, access(2) and chmod(2).

     Upon successful completion, the value 0 is	returned; otherwise the
     value -1 is returned and the global variable errno	is set to indicate the

     Previous versions of the system used different types for the st_dev,
     st_uid, st_gid, st_rdev, st_size, st_blksize and st_blocks	fields.

     The stat()	and lstat() system calls will fail if:

     [EACCES]		Search permission is denied for	a component of the
			path prefix.

     [EFAULT]		The sb or path argument	points to an invalid address.

     [EIO]		An I/O error occurred while reading from or writing to
			the file system.

     [ELOOP]		Too many symbolic links	were encountered in translat-
			ing the	pathname.

     [ENAMETOOLONG]	A component of a pathname exceeded 255 characters, or
			an entire path name exceeded 1023 characters.

     [ENOENT]		The named file does not	exist.

     [ENOTDIR]		A component of the path	prefix is not a	directory.

     [EOVERFLOW]	The file size in bytes cannot be represented correctly
			in the structure pointed to by sb.

     The fstat() system	call will fail if:

     [EBADF]		The fd argument	is not a valid open file descriptor.

     [EFAULT]		The sb argument	points to an invalid address.

     [EIO]		An I/O error occurred while reading from or writing to
			the file system.

     [EOVERFLOW]	The file size in bytes cannot be represented correctly
			in the structure pointed to by sb.

     access(2),	chmod(2), chown(2), utimes(2), symlink(7)

     Applying fstat() to a socket (and thus to a pipe) returns a zeroed	buf-
     fer, except for the blocksize field, and a	unique device and inode	num-

     The stat()	and fstat() system calls are expected to conform to ISO/IEC
     9945-1:1990 ("POSIX.1").

     The stat()	and fstat() system calls appeared in Version 7 AT&T UNIX.  The
     lstat() system call appeared in 4.2BSD.

BSD			       February	15, 2002			   BSD


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