Tcl_SetErrno man page on QNX

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Tcl_SetErrno(3)		    Tcl Library Procedures	       Tcl_SetErrno(3)

______________________________________________________________________________

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()

       CONST char *
       Tcl_ErrnoId()

       CONST char *
       Tcl_ErrnoMsg(errorCode)

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 boundÔÇÉ
       aries 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.

KEYWORDS
       errno, error code, global variables

Tcl				      8.3		       Tcl_SetErrno(3)
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