301223 - support WinCE in NSPR on the trunk

Status: RESOLVED DUPLICATE of bug 456449

(NSPR :: NSPR, enhancement)

Description

[Nelson Bolyard (seldom reads bugmail)]

There are 5 branches of NSPR that were all created to support WinCE.
Some of them are quite complete, others are less so.
But the fact that they are on branches, not the trunk, means that
their bits have all rotted, and no-one is sure which of the many WinCE
branches to use.  To solve these issues, I think we need to support 
WinCE on the trunk of NSPR.  

Further, I think some of the NSPR additions that were originally made
for WinCE should be unconditionally available (on all platforms) on 
the trunk.  For example, On these branches:
        NSPRPUB_PRE_4_2_WINCE_BRANCH
        NSPR_PRE_4_2_WINCE_BRANCH
        WINCE_20020710_BRANCH
        WINCE_NSPRPUB_RELEASE_4_2_BETA1
NSPR's headers include this function declaration:

/*
** Return the address of thread's last os error variable.
** Used to implement errno on platforms that lack it.
*/
NSPR_API(PRInt32 *) PR_GetOSErrorAddress(void);

and this function definition in prerror.c

PR_IMPLEMENT(PRInt32 *) PR_GetOSErrorAddress(void)
{
    PRThread *thread = PR_GetCurrentThread();
    return &thread->osErrorCode;
}

Then errno was defined (not in NSPR, but in some "shim" header) as 

#ifndef errno  /* or something like that */
#define errno (* PR_GetOSErrorAddress())
#endif

Note that this returns the address of the same tls variable whose 
value is returned by PR_GetOSError().

I'd like to see that function and its declaration become part of NSPR 
on the trunk, and not conditionally compiled, but on every platform.  
(The definition of errno can continue to be handled outside of NSPR.)

Comment 1

[Doug Turner (:dougt)]

I currently use this branch: NSPRPUB_PRE_4_2_WINCE_BRANCH

Comment 2

[Wan-Teh Chang]

'errno' and the underlying per-thread implementation will
be provided by the mozce shunt library.