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Tcl_Access(3)			      Tcl Library Procedures			    Tcl_Access(3)


       Tcl_Access, Tcl_Stat - check file permissions and other attributes

       #include <tcl.h>

       Tcl_Access(path, mode)

       Tcl_Stat(path, statPtr)

       char *path (in)			  Native name of the file to check the attributes of.

       int mode (in)			  Mask	consisting of one or more of R_OK, W_OK, X_OK and
					  F_OK.  R_OK, W_OK and X_OK request checking whether the
					  file exists and  has	read, write and  execute  permis-
					  sions, respectively.	F_OK just requests  checking  for
					  the existence of the file.

       struct stat *statPtr (out)	  The structure that contains the result.

       As of Tcl 8.4, the object-based APIs Tcl_FSAccess and Tcl_FSStat should be used in prefer-
       ence to Tcl_Access and Tcl_Stat, wherever possible.

       There are two reasons for calling Tcl_Access and Tcl_Stat rather than calling system level
       functions  access  and stat directly.  First, the Windows implementation of both functions
       fixes some bugs in the system level calls.  Second, both Tcl_Access and Tcl_Stat (as  well
       as  Tcl_OpenFileChannelProc) hook into a linked list of functions.  This allows the possi-
       bility to reroute file access to alternative media or access methods.

       Tcl_Access checks whether the process would be allowed to read, write or  test  for  exis-
       tence of the file (or other file system object) whose name is pathname.	 If pathname is a
       symbolic link on Unix, then permissions of the file referred by	this  symbolic	link  are

       On  success (all requested permissions granted), zero is returned.  On error (at least one
       bit in mode asked for a permission that is denied, or some other  error occurred),  -1  is

       Tcl_Stat  fills the stat structure statPtr with information about the specified file.  You
       do not need any access rights to the file to get this  information  but	you  need  search
       rights  to  all	directories  named  in	the path leading to the file.  The stat structure
       includes info regarding device, inode (always 0 on Windows), privilege mode, nlink (always
       1  on  Windows), user id (always 0 on Windows), group id (always 0 on Windows), rdev (same
       as device on Windows), size, last access time, last modification time, and creation time.

       If path exists, Tcl_Stat returns 0 and the stat structure is filled with data.  Otherwise,
       -1 is returned, and no stat info is given.

       stat, access

Tcl					       8.1				    Tcl_Access(3)
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