/*  C K C S I G . H  */

/*  Definitions and prototypes for signal handling  */

/*
  Author: Jeffrey Altman (jaltman@columbia.edu),
  Columbia University Academic Information Systems, New York City.

  Copyright (C) 1985, 1996, Trustees of Columbia University in the City of New
  York.  The C-Kermit software may not be, in whole or in part, licensed or
  sold for profit as a software product itself, nor may it be included in or
  distributed with commercial products or otherwise distributed by commercial
  concerns to their clients or customers without written permission of the
  Office of Kermit Development and Distribution, Columbia University.  This
  copyright notice must not be removed, altered, or obscured.
*/
#ifdef OS2
#ifndef NT
#ifndef __HEV__			/* INCL_SEMAPHORE may also define HEV */
#define __HEV__
typedef  ULONG    HEV;			/* hev */
typedef  HEV      *PHEV;
#endif /* __HEV__ */
#endif /* NT */
struct _threadinfo {
    int inuse;
    int child;
    int sibling;
#ifdef NT
    HANDLE id;
    HANDLE handle;
    HANDLE parent;
    HANDLE CompletionSem ;
    HANDLE DieSem ;
#else /* NT */
    TID id;
    TID parent;
    HEV CompletionSem;
    HEV DieSem;
#endif /* NT */
};
#endif /* OS2 */

#ifdef CK_ANSIC
typedef SIGTYP (*ck_sigfunc)(void *);
typedef SIGTYP (*ck_sighand)(int);
#else
typedef SIGTYP (*ck_sigfunc)();
typedef SIGTYP (*ck_sighand)();
#endif /* CK_ANSIC */

/* Macros for POSIX vs old-style signal handling. */

#ifdef CK_POSIX_SIG
typedef sigjmp_buf ckjmpbuf;
#else
#ifdef NT
#include <windows.h>
#ifdef NTASM
typedef struct {
    CONTEXT context;
    DWORD retcode;
} ckjmpbuf;
#else /* NTASM */
typedef jmp_buf ckjmpbuf;
#endif /* NTASM */
#else
typedef jmp_buf ckjmpbuf;
#endif
#endif /* CK_POSIX_SIG */
/*
  Suppose you want to pass the address of a jmp_buf bar to a function foo.
  Since jmp_buf is normally defined (typedef'd) as an array, you would do
  it like this:  foo(bar), where foo = foo(jmp_buf bar).  But suppose a
  jmp_buf is (say) a struct rather than an array.  Then you must do
  foo(&bar) where foo is foo(jmp_buf * bar).  This is controlled here in
  the traditional fashion, by ifdefs.  By default, we assume that jmp_buf
  is an array.  Define the symbol JBNOTARRAY if jmp_buf is not an array.
*/  
#ifndef JBNOTARRAY
#ifdef NT
#define JBNOTARRAY
#endif /* NT */
#endif /* JBNOTARRAY */

#ifdef JBNOTARRAY
typedef ckjmpbuf * ckjptr;
#define ckjaddr(x) & x
#define ckjdref(x) * x
#ifdef CK_POSIX_SIG
#define cksetjmp(x) sigsetjmp(x,1)
#define cklongjmp(x,y) siglongjmp(x,y)
#else
#ifdef NT
__inline int
ck_ih(void) {
    extern int TlsIndex;
#ifdef NTSIG
    struct _threadinfo * threadinfo;
    threadinfo = (struct _threadinfo *) TlsGetValue(TlsIndex);
    if (threadinfo) {
	if (WaitAndResetSem(threadinfo->DieSem,0)) {
	    ckThreadDie(threadinfo);
	    return 1;			/* This should never execute */
	}
    }
#ifdef COMMENT
    else debug( F100, "ck_ih() threadinfo is NULL","",0);
#endif /* COMMENT */
#endif /* NTSIG */
    return 0;
}
#ifdef NTSIG
#define cksetjmp(x) setjmp(x)
#define cklongjmp(x,y) longjmp(x,y)
#else /* NTSIG */
#ifdef NTASM
__inline DWORD
cksetjmp( ckjptr jmp ) {
    extern int isinterrupted;
    jmp->retcode = 0;
    memset( &jmp->context, 0, sizeof(CONTEXT) );
    jmp->context.ContextFlags = CONTEXT_FULL ;
    if ( !GetThreadContext( GetCurrentThread(), &jmp->context ) )
      debug( F101, "cksetjmp GetThreadContext failed","",GetLastError());
    debug(F101,"cksetjmp returns","",jmp->retcode);
    isinterrupted = 0;
    return (jmp->retcode);
}

__inline void 
cklongjmp( ckjptr jmp, int retval ) {
    extern HANDLE tidCommand;
    extern int ttyfd, mdmtyp ;
    extern DWORD CommandID;
    extern int isinterrupted;

    connoi();
    isinterrupted = 1;
    jmp->retcode = ( retval ? retval : 1 );
    debug(F101,"about to SetThreadContext for thread","", CommandID);
    debug(F101,"from Thread","",GetCurrentThreadId());
    if ( mdmtyp >= 0 ) {
	PurgeComm( (HANDLE) ttyfd, PURGE_TXABORT | PURGE_RXABORT );
    }
    if (SetThreadContext( tidCommand, &jmp->context ))
      debug(F100,"cklongjmp SetThreadContext success","",0);
    else
      debug(F101,"cklongjmp SetThreadContext failed","",GetLastError());
    msleep(50);
    cmini(1);				/* Reset command parser */
    putkey(13);				/* Stuff a carriage return */
   /* PostEventAvailSem(); */
}
#else /* NTASM */
void crash( void ) ;
#define cksetjmp(x) setjmp(x)
__inline void 
cklongjmp( ckjptr jmp, int retval ) {
    extern HANDLE tidCommand;
    extern int ttyfd, mdmtyp;
    extern DWORD CommandID;
    CONTEXT context;

    if ( mdmtyp >= 0 ) {
	PurgeComm( (HANDLE) ttyfd, PURGE_TXABORT | PURGE_RXABORT ) ;
    }
    memset( &context, 0, sizeof(CONTEXT) );
    context.ContextFlags = CONTEXT_FULL;
    if ( !GetThreadContext( tidCommand, &context ) )
      debug( F101, "cklongjmp GetThreadContext failed","",GetLastError());
           
    /* Invalidate the instruction pointer */
    context.Eip =  (unsigned long) crash;

    debug(F101,"about to SetThreadContext for thread","", CommandID);
    debug(F101,"from Thread","",GetCurrentThreadId());
    if (SetThreadContext( tidCommand, &context ))
      debug(F100,"cklongjmp SetThreadContext success","",0);
    else
      debug(F101,"cklongjmp SetThreadContext failed","",GetLastError());
}
#endif /* NTASM */
#endif /* NTSIG */
#else /* NT */
#define cksetjmp(x) setjmp(x)
#endif /* NT */
#endif /* CK_POSIX_SIG */
#else  /* jmp_buf is an array */
typedef ckjmpbuf ckjptr;
#define ckjaddr(x) x
#define ckjdref(x) x
#ifdef CK_POSIX_SIG
#define cksetjmp(x) sigsetjmp(x,1)
#define cklongjmp(x,y) siglongjmp(x,y)
#else
#define cksetjmp(x) setjmp(x)
#define cklongjmp(x,y) longjmp(x,y)
#endif /* CK_POSIX_SIG */
#endif /* JBNOTARRAY */

_PROTOTYP( int cc_execute, (ckjptr, ck_sigfunc, ck_sigfunc) );
_PROTOTYP( int alrm_execute,
	  (ckjptr,
	   int /* timo */,
	   ck_sighand /* handler */,
	   ck_sigfunc, ck_sigfunc) );
_PROTOTYP( int cc_alrm_execute,
	  (ckjptr,
	   int /* timo */,
	   ck_sighand /* handler */,
	   ck_sigfunc,
	   ck_sigfunc) );

/* End of ckusig.h */