Tcl_Access, Tcl_Stat — check file permissions and other attributes
- Tcl_Access, Tcl_Stat — check file permissions and other attributes
- #include <tcl.h>
- Tcl_Access(path, mode)
- Tcl_Stat(path, statPtr)
- OBSOLETE FUNCTIONS
- SEE ALSO
As of Tcl 8.4, the object-based APIs Tcl_FSAccess and Tcl_FSStat
should be used in preference to Tcl_Access and Tcl_Stat, wherever
possible. Those functions also support Tcl's virtual filesystem layer, which
these do not.
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 possibility to reroute file access to alternative media or access
- const 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 permissions, respectively.
F_OK just requests a check for the existence of the file.
- struct stat *statPtr (out)
The structure that contains the result.
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
path. If path is a symbolic link on Unix, then permissions 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 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.
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