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

SYNOPSIS
     #include <tcl.h>

     void
     Tcl_SetErrno(errorCode)

     int
     Tcl_GetErrno()

     char *
     Tcl_ErrnoId()

     char *
     Tcl_ErrnoMsg()


ARGUMENTS
     int          errorCode    (in)      A POSIX error code  such
                                         as ENOENT.
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DESCRIPTION
     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 a string  representation
     of  the current errno value.  Tcl_ErrnoId returns a machine-
     readable textual identifier such as  "EACCES".  Tcl_ErrnoMsg
     returns a human-readable string such as "permission denied".
     The strings returned by these functions are statically allo-
     cated and the caller must not free or modify them.

KEYWORDS
     errno, error code, global variables

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