Data Types in stat.h

The stat.h header file defines several data types. The table below lists the types used to describe a file's properties.

The stat structure contains information about a file. The table below lists the members in this structure.

Table 2. Structure Members in stat.h
Structure	Data Type	Contains
st_mode	mode_t	File attributes.
st_ino	ino_t	File serial number.
st_dev	dev_t	ID of device on which this file is stored.
st_nlink	nlink_t	Number of links to the file.
st_uid	uid_t	The file owner's user ID.
st_gid	gid_t	The file owner's group ID.
st_size	off_t	The file's size, in bytes.
st_atime	time_t	Time of last access to the file.
st_mtime	time_t	Time of the last modification to the file.
st_ctime	time_t	Time that the file was created.
st_blksize	long	Optimal block size.
st_blocks	long	Number of blocks allocated to the file.

The table below describes the file attributes that the facilities in stat.h recognize.

Table 3. File Modes
Mode	File Property
S_IFMT	File type.
S_IFIFO	FIFO queue.
S_IFCHR	Character special.
S_IFDIR	Directory.
S_IFBLK	Blocking stream.
S_IFREG	Regular file.
S_IFLNK	Symbolic link.
S_IFSOCK	Socket.
S_IRGRP	Read permission, file group class.
S_IROTH	Read permission, file other class.
S_IRUSR	Read permission, file owner class.
S_IRWXG	Permission, file group class.
S_IRWXO	Permission, file group class.
S_IRWXU	Permission, file group class.
S_ISGID	Set group ID on execution.
S_ISUID	Set user ID on execution.
S_IWGRP	Write permission, file group class.
S_IWOTH	Write permission, file other class.
S_IWUSR	Write permission, file owner class
S_IXGRP	Execute permission, file group class
S_IXOTH	Execute permission, file other class.
S_IXUSR	Execute permission, file owner class.