Tcl_SetErrno(3) Tcl Library Procedures Tcl_SetErrno(3)_________________________________________________________________NAME
Tcl_SetErrno, Tcl_GetErrno - manipulate errno to store and
retrieve error codes
SYNOPSIS
#include <tcl.h>
void
Tcl_SetErrno(errorCode)
int
Tcl_GetErrno()ARGUMENTS
int errorCode (in) A POSIX error code
such as ENOENT.
_________________________________________________________________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. Proce-
dures wishing to access errno should call this procedure
instead of accessing errno directly.
KEYWORDS
errno, error code, global variables
Tcl 7.5 1
