fstat man page on HP-UX

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fstat(2)							      fstat(2)

       fstat() - get file status

       The function obtains information about an open file associated with the
       file descriptor fildes, and writes it to the area pointed  to  by  buf.
       fildes is a file descriptor for an open file, which is created with the
       successful completion of an or system call.  See the open(2), creat(2),
       dup(2),	fcntl(2),  or pipe(2)) manpages for more detailed information.
       The buf argument is a pointer to a structure, as defined in  where  the
       file  system information is stored.  The structure contains the follow‐
       ing members:

	      dev_t    st_dev;	     /* ID of device containing a */
				     /* directory entry for this file */
	      ino_t    st_ino;	     /* Inode number */
	      short    st_fstype;    /* Type of filesystem this file  */
				     /* is in; see sysfs(2) */
	      ushort   st_mode;	     /* File type, attributes, and */
				     /* access control summary */
	      ushort   st_basemode   /* Permission bits (see chmod(1)) */
	      ushort   st_nlink;     /* Number of links */
	      uid_t    st_uid;	     /* User ID of file owner */
	      gid_t    st_gid;	     /* Group ID of file group */
	      dev_t    st_rdev;	     /* Device ID; this entry defined */
				     /* only for char or blk spec files */
	      off_t    st_size;	     /* File size (bytes) */
	      time_t   st_atime;     /* Time of last access */
	      time_t   st_natime;    /* Reserved. DO NOT USE; field may change. */
	      time_t   st_mtime;     /* Last modification time */
	      time_t   st_nmtime;    /* Reserved. DO NOT USE; field may change. */
	      time_t   st_ctime;     /* Last file status change time */
				     /* Measured in secs since */
				     /* 00:00:00 GMT, Jan 1, 1970 */
	      time_t   st_nctime;    /* Reserved. DO NOT USE; field may change. */
	      long     st_blksize;   /* File system block size */
	      uint     st_acl:1;     /* Set if the file has optional */
				     /* access control list entries */
				     /* HFS File Systems only */
	      uint     st_aclv:1;    /* Set if the file has optional */
				     /* access control list entries */
				     /* JFS File Systems only */

       (Note that the position of items in  this  list	does  not  necessarily
       reflect the order of the members in the structure.)

       The fields contain the following information:

	      st_atime	     Time  when	 file data was last accessed.  Changed
			     by the following system calls: (see the read(2)),
			     and  If  a	 file  is  mapped into virtual memory,
			     accesses of file data  through  the  mapping  may
			     also modify st_mtime.  See mmap(2).

	      st_mtime	     Time when data was last modified.	Changed by the
			     following system calls:  (see  truncate(2)),  and
			     (see  write(2)).  Also changed by when the refer‐
			     ence count reaches zero on	 a  named  pipe	 (FIFO
			     special)  file  that contains data.  If a file is
			     mapped into virtual memory, updates of file  data
			     through  the  mapping  may	 also modify st_mtime.
			     See mmap(2).

	      st_ctime	     Time when file status was last changed.   Changed
			     by the following system calls: (see truncate(2)),
			     and (see write(2)).  The command  (see  touch(1))
			     can  be used to explicitly control the times of a

	      st_mode	     The value returned in this field is the  bit-wise
			     inclusive	OR  of	a  value indicating the file's
			     type, attribute bits, and a value summarizing its
			     access  permission.   See mknod(2).  For ordinary
			     users, the least significant nine bits consist of
			     the  file's  permission  bits modified to reflect
			     the access granted or denied  to  the  caller  by
			     optional  entries	in  the	 file's access control
			     list.  For users with appropriate privileges  the
			     least significant nine bits are the file's access
			     permission bits.  In addition,  the  (execute  by
			     owner)  mode  bit	is set if the following condi‐
			     tions are met:

			     ·	The file is a regular file,

			     ·	No permission execute bits are set, and

			     ·	An execute bit is set in one or	 more  of  the
				file's optional access control list entries.

			     The  write	 bit  is  not  cleared for a file on a
			     read-only file system or  a  shared-text  program
			     file  that	 is  being  executed.  However, clears
			     this  bit	under  these  conditions  (see	getac‐

       The  value of the member st_nlink will be set to the number of links to
       the file.  If the chosen path name  or  file  descriptor	 refers	 to  a
       Multi-Level  Directory  (MLD), and the process does not have the multi‐
       level effective privilege, the i-node number returned in st_ino is  the
       i-node of the MLD itself.

       An  implementation  that provides additional or alternative file access
       control	mechanisms  may,  under	 implementation-dependent  conditions,
       cause to fail.

       The  function  updates  any  time-related  fields as described in "File
       Times Update" (see the Chapter 4, Character Set), before	 writing  into
       the structure.

       Note:  The  st_natime,  st_nmtime,  and	st_nctime fields are currently
       reserved.  To avoid compatibility problems, these fields should not  be

       Upon successful completion, is returned.	 Otherwise, is returned and is
       set to indicate the error.

       When using to get the status of	a  socket  descriptor,	the  following
       return values are also possible:

	      [EINPROGRESS]	   Nonblocking I/O is enabled using or and the
				   connection cannot be completed immediately.
				   This is not a failure.  Make the call again
				   a few seconds later.	  Alternatively,  wait
				   for completion by calling and selecting for

	      [EWOULDBLOCK]	   Non-blocking	 I/O  is  enabled  using   the
				   request,  and the requested operation would

       The function will fail if:

	      The		  fildes argument is not a valid file descrip‐

	      An I/O error occurred while reading from the file system.

	      buf		  or  path  points to an invalid address.  The
				  reliable detection of this error  is	imple‐

	      A 32-bit application is making this call on a file where the
				  or  other  field(s)  would  need  to	hold a
				  64-bit value.

       The st_basemode, st_acl and st_aclv fields are zero on  files  accessed
       remotely.   The	st_acl	field  is applicable to HFS File Systems only.
       The st_aclv field is applicable to JFS File Systems only.

   Access Control Lists - HFS and JFS File Systems Only
       Access control list descriptions in this entry apply only  to  HFS  and
       JFS file systems on standard HP-UX operating systems.

       For  32-bit  applications,  will	 be truncated to its least significant
       32-bits for filesystems that use 64-bit values.

       The st_uid and st_gid fields are set to −1 if they are not specified on
       the disk for a given file.

       and  were  developed by AT&T.  was developed by the University of Cali‐
       fornia, Berkeley.

       touch(1), acl(2), chmod(2), chown(2),  creat(2),	 fstat64(2),  link(2),
       lstat(2),  mknod(2),  pipe(2), read(2), rename(2), setacl(2), sysfs(2),
       time(2), truncate(2), unlink(2), utime(2), write(2),  acl(5),  aclv(5),
       privileges(5), stat(5), <sys/stat.h>, <sys/types.h>.

       fstat(): AES, SVID2, SVID3, XPG2, XPG3, XPG4, FIPS 151-2, POSIX.1


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