SetErrno man page on OSF1

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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 bound‐
       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.

KEYWORDS
       errno, error code, global variables

Tcl				      7.5		       Tcl_SetErrno(3)
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