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stat(2)								       stat(2)

Name
       stat, lstat, fstat - get file status

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

       stat(path, buf)
       char *path;
       struct stat *buf;

       lstat(path, buf)
       char *path;
       struct stat *buf;

       fstat(fd, buf)
       int fd;
       struct stat *buf;

Description
       The  system call obtains information about the file path.  Read, write,
       or execute permission of the named file is not required, but all direc‐
       tories specified in the path name that leads to the file must be reach‐
       able.

       The system call is like except when a named file is  a  symbolic	 link.
       In  this instance, returns information about the link; returns informa‐
       tion about the file that is referenced by the link.

       The system call and the system call obtain the same  information	 about
       an open file referenced by the argument descriptor.

       The buf argument is a pointer to a structure.  Information about a file
       is placed in the structure.  The contents of the structure  pointed  to
       by the buf argument includes the following:
       struct stat {
	 dev_t	 st_dev;    /* device inode resides on */
	 ino_t	 st_ino;    /* this inode's number */
	 u_short st_mode;   /* protection */
	 short	 st_nlink;  /* number or hard links to the file */
	 short	 st_uid;    /* user-id of owner */
	 short	 st_gid;    /* group-id of owner */
	 dev_t	 st_rdev;   /* the device type, for inode that is device */
	 off_t	 st_size;   /* total size of file */
	 time_t	 st_atime;  /* file last access time */
	 int	 st_spare1;
	 time_t	 st_mtime;   /* file last modify time */
	 int	 st_spare2;
	 time_t	 st_ctime;   /* file last status change time */
	 int	 st_spare3;
	 long st_blksize; /* optimal blocksize for file system i/o ops */
	 long st_blocks;  /* actual number of blocks allocated */
	 long st_spare4;
	 u_long st_gennum; /* file generation number */
	   };

       st_atime	   The time when file data was last accessed.  This is changed
		   by the and system calls.  For efficiency, st_atime  is  not
		   set when a directory is searched.

       st_mtime	   The	time  when  data  was last modified.  It is not set by
		   changes of owner,  group,  link  count,  or	mode.	It  is
		   changed by the and system calls.

       st_ctime	   The	time  when file status was last changed.  It is set by
		   writing and changing the i-node. It can be changed  by  the
		   following system calls: and

       The status information word st_mode has the following bits:
       #define S_IFMT	0170000 /* type of file */
       #define S_IFDIR	0040000 /* directory */
       #define S_IFCHR	0020000 /* character special */
       #define S_IFBLK	0060000 /* block special */
       #define S_IFREG	0100000 /* regular */
       #define S_IFLNK	0120000 /* symbolic link */
       #define S_IFSOCK 0140000 /* socket */
       #define S_IFIFO	0010000 /* FIFO - named pipe */
       #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_IREAD	0000400 /* read permission, owner */
       #define S_IWRITE 0000200 /* write permission, owner */
       #define S_IEXEC	0000100 /* execute/search permission, owner */
       The  mode bits 0000070 and 0000007 encode group and others permissions.
       For further information, see

       When fd is associated with a pipe, returns a buffer with	 only  st_blk‐
       size set.

Environment
       SYSTEM_FIVE

       Unlike the System V definition, ELOOP is a possible error condition.

Restrictions
       The  fields  in	the  stat  structure  marked st_spare1, st_spare2, and
       st_spare3 are used when inode time stamps expand	 to  64	 bits.	 This,
       however,	 can  break  certain  programs	that depend on the time stamps
       being contiguous in calls to

Return Values
       Upon successful completion, a value of zero (0)	is  returned.	Other‐
       wise, a value of -1 is returned and errno is set to indicate the error.

Diagnostics
       The and system calls fail if any of the following is true:

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

       [EFAULT]	      The buf or name 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 translating
		      the pathname.

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

       [ENOENT]	      The named file does not exist or path points to an empty
		      string and the environment  defined  is  POSIX  or  SYS‐
		      TEM_FIVE.

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

       The system call fails if one or more of the following are true:

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

       [EFAULT]	      The buf points to an invalid address.

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

       [ETIMEDOUT]    A	 connect  request  or  remote  file  operation	failed
		      because  the  connected  party  did  not respond after a
		      period of time determined by the	communications	proto‐
		      col.

See Also
       chmod(2),  chown(2),  link(2), mknod(2), read(2), unlink(2), utimes(2),
       write(2)

								       stat(2)
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