System Booster/System Booster.iso/Archives/ARexxTools/Rxil.lha/Rxil/src/launch.c

C/C++ Source or Header | 1989-12-30 | 4.5 KB | 244 lines

/* launch.c */

/*        Copyright © 1989 by Donald T. Meyer, Stormgate Software
 *        All Rights Reserved
 */



#include "rxil.h"

#include <string.h>



/* NAME
 *        RxilLaunch
 *
 * SYNOPSIS
 *        result = RxilLaunch( rxi )
 *
 *        LONG result;
 *
 *        struct RxilInvocation *rxi;
 *
 * FUNCTION
 *        Launch an ARexx program by sending an invocation message
 *        to the RexxMaster process.  The RxilInvocation structure
 *        which is allocated prior to this call via RxilCreateRxi()
 *        contains the information neccessary to launch the program.
 *
 * INPUTS
 *        rxi        A pointer to an initialized RxilInvocation structure.
 *
 * RESULT
 *        Zero if the launch was successful, non-zero otherwise.
 *
 * SIDES
 *
 * HISTORY
 *        01-Aug-89    Creation.
 *
 * BUGS
 *
 * SEE ALSO
 *        RxilCreateRxi(), RxilDeleteRxi()
 */

LONG RxilLaunch( struct RxilInvocation *rxi )
{
    struct RexxArg *arg;
    struct MsgPort *rmast, *replyport;
    struct RexxMsg *rexxmsg;
    int i;
    int ac=0;
    UWORD len;


    /* Make call "safe" even if RxilInit() failed */
    if( global_rdef == NULL )
    {
        return( -1 );
    }


    /* Replys can come in at either port. */
    replyport = global_rdef->SecretPort ?
        global_rdef->SecretPort : global_rdef->PublicPort;


    if( rxi->State != RXIL_STATE_AVAILABLE )
    {
        /* A command is already launched, (using this structure),
         * or the reply has not yet been dealt with.
         */
        return( -1 );
    }


    /* Allocate a packet to send to rexxmaster */
    rexxmsg = CreateRexxMsg( replyport, rxi->FileExt, rxi->CommAddr );
    if( rexxmsg == NULL )
    {
        return( -1 );
    }

    /* Allocate an argument string for the command name and args */
    arg = CreateArgstring(  rxi->Name, strlen( rxi->Name )  );
    if( arg == NULL )
    {
        DeleteRexxMsg( rexxmsg );
        return( -1 );
    }

    ARG0(rexxmsg) = (STRPTR)arg;


    if( rxi->Type == RXFUNC )
    {
        /* This is a Function invocation. */

        /* Turn the arguments into Rexx Argstrings and place in the
         * RexxMsg packet.
         */
        for( i=1; i<=MAXRMARG; i++ )
        {
            if( rxi->FuncArg[i] == NULL )
            {
                /* Empty argument slot, consider it the last */
                break;
            }

            /* We can either determine the argument length, or the client
             * can pre-set a count.
             */
            len = rxi->CountArgs ?
                rxi->ArgLen[i] : strlen(rxi->FuncArg[i]);

            rexxmsg->rm_Args[i] =
                (STRPTR)CreateArgstring( rxi->FuncArg[i], len );

            ac++;

            if( rexxmsg->rm_Args[i] == NULL )
            {
                /* Unable to create this argstring.  Cleanup and return
                 * a failure code.
                 */
                for( i=0; i<=MAXRMARG; i++ )
                {
                    if( rexxmsg->rm_Args[i] != NULL )
                    {
                        DeleteArgstring( (struct RexxArg *)
                            (rexxmsg->rm_Args[i]) );
                    }
                }

                DeleteRexxMsg( rexxmsg );
                return( -1 );
            }
        }

        rexxmsg->rm_Action = RXFUNC | rxi->ActionFlags | ac;
    }
    else
    {
        /* This is a Command invocation */
         rexxmsg->rm_Action = RXCOMM | rxi->ActionFlags;
    }


    /* Set up the I/O streams for the macro */

    if( rxi->Parent == NULL )
    {
        /* This is an original launch from the application */
        if( rxi->Console )
        {
            /* And there is a console spec.  Use it. */
            RxilOpenConsole( rxi->Console, rexxmsg );
        }
    }
    else
    {
        /* This is a loopback child of a macro.  Use the I/O fields
         * from the parent message.
         */
        rexxmsg->rm_Stdin = rxi->Parent->rm_Stdin;
        rexxmsg->rm_Stdout = rxi->Parent->rm_Stdout;
    }


    Forbid();
    if(   (  rmast = FindPort( rxi->IHostPort )  ) != NULL   )
    {
        PutMsg( rmast, (struct message *)rexxmsg );
    }
    Permit();

    if( rmast == NULL )
    {
        /* we could not find the REXX port, this failed!
         * Cleanup and return a failure code.
         */
        for( i=0; i<=MAXRMARG; i++ )
        {
            if( rexxmsg->rm_Args[i] != NULL )
            {
                DeleteArgstring( (struct RexxArg *)
                    (rexxmsg->rm_Args[i]) );
            }
        }

        if( rxi->Console )
        {
            RxilCloseConsole( rexxmsg );
        }

        DeleteRexxMsg( rexxmsg );
        return( -1 );
    }


    /* If we make it here, we have hopefully launched. */

    /* Set this so we can recognize the reply, and to let us know that
     * we have a command pending.
     */
    rxi->RexxMsg = rexxmsg;
    rxi->State = RXIL_STATE_PENDING;


    if( rxi->CommAddr == global_rdef->SecretPortName )
    {
#if 0
        if( global_rdef->Locked  )
        {
            /* Since we are locked, we should not be launching any macros
             * which have the secret port as their initial host address.
             */
            return( -1 );
        }
#endif

        /* Increment the locked count.
         */
        global_rdef->LockCount++;
    }


    if( rxi->Parent == NULL )
    {
        /* This is a launch originated within the application. */
        if(  FlagIsClear( global_rdef->Flags, RXIL_NO_ABORT )  )
        {
            /* Post the macro cancel requester */
            RxilPostCancel();
        }
    }


    return( 0 );
}