Tcl_Access man page on UnixWare

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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.

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

       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 possibity 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 existence of the file (or other file system	object)	 whose
       name  is	 pathname.   If pathname is a symbolic link on Unix, then per‐
       missions of the file referred by this symbolic link are tested.

       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 returned.

       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 regard‐
       ing device, inode (always 0 on Windows), priviledge 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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