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Access(3) - Tcl_Access, Tcl_Stat, Tcl_Access, Tcl_Stat - check file permissions and other attributes - man 3 Access

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Tcl_Access(3)               Tcl Library Procedures               Tcl_Access(3)

       Tcl_Access, Tcl_Stat - check file(1,n) permissions and other attributes

       #include <tcl.h>

       Tcl_Access(path, mode)

       Tcl_Stat(path, statPtr)

       Native name of the file(1,n) to check the attributes of.  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(1,n)  exists and  has  read(2,n,1 builtins), write(1,2) and  execute
       permissions, respectively.  F_OK just requests checking for  the  exis-
       tence of the file.  The structure that contains the result.

       As of Tcl 8.4, the object-based APIs Tcl_FSAccess and Tcl_FSStat should
       be used in(1,8) preference 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(2,5) and stat(1,2) directly.  First, the
       Windows implementation of both functions fixes some bugs in(1,8) 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  possibility to reroute file(1,n) access(2,5) to alternative media or
       access(2,5) methods.

       Tcl_Access checks whether the process would be allowed to  read(2,n,1 builtins),  write(1,2)
       or  test  for existence of the file(1,n) (or other file(1,n) system object) whose
       name is pathname.   If pathname is a symbolic link(1,2) on Unix,  then  per-
       missions of the file(1,n) referred by this symbolic link(1,2) are tested.

       On  success  (all requested permissions granted), zero is returned.  On
       error(8,n) (at least one bit in(1,8) mode asked for a permission that is  denied,
       or some other  error(8,n) occurred), -1 is returned.

       Tcl_Stat  fills  the  stat(1,2) structure statPtr with information about the
       specified file.  You do not need any access(2,5) rights to the file(1,n)  to  get
       this information but you need search rights to all directories named(5,8) in(1,8)
       the path leading to the file.  The stat(1,2) structure includes info(1,5,n) regard-
       ing  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(2,5) time(1,2,n),
       last modification time(1,2,n), and creation time.

       If path exists, Tcl_Stat returns 0 and the  stat(1,2)  structure  is  filled
       with data.  Otherwise, -1 is returned, and no stat(1,2) info(1,5,n) is given.

       stat(1,2), access(2,5)

Tcl                                   8.1                        Tcl_Access(3)

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