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Tcl_SetErrno(3)             Tcl Library Procedures             Tcl_SetErrno(3)


       Tcl_SetErrno, Tcl_GetErrno, Tcl_ErrnoId, Tcl_ErrnoMsg - manipulate errno to store and retrieve error codes

       #include <tcl.h>



       const char *

       const char *

       int errorCode (in)          A POSIX error code such as ENOENT.

       Tcl_SetErrno  and  Tcl_GetErrno  provide portable access to the errno variable, which is used to record a POSIX
       error code after system calls and other operations such as Tcl_Gets.  These procedures  are  necessary  because
       global variable accesses cannot be made across module boundaries on some platforms.

       Tcl_SetErrno  sets  the  errno variable to the value of the errorCode argument C procedures that wish to return
       error information to their callers via errno should call Tcl_SetErrno rather than setting errno directly.

       Tcl_GetErrno returns the current value of errno.  Procedures wishing to access errno should call this procedure
       instead of accessing errno directly.

       Tcl_ErrnoId  and  Tcl_ErrnoMsg  return  string representations of errno values.  Tcl_ErrnoId returns a machine-
       readable textual identifier such as "EACCES" that corresponds to the  current  value  of  errno.   Tcl_ErrnoMsg
       returns  a  human-readable  string  such  as "permission denied" that corresponds to the value of its errorCode
       argument.  The errorCode argument is typically the value returned by Tcl_GetErrno.   The  strings  returned  by
       these functions are statically allocated and the caller must not free or modify them.

       errno, error code, global variables

Tcl                                   8.3                      Tcl_SetErrno(3)