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Annotation of 43BSD/ucb/pascal/pdx/process/start.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1980 Regents of the University of California.
        !             3:  * All rights reserved.  The Berkeley software License Agreement
        !             4:  * specifies the terms and conditions for redistribution.
        !             5:  */
        !             6: 
        !             7: #ifndef lint
        !             8: static char sccsid[] = "@(#)start.c    5.1 (Berkeley) 6/6/85";
        !             9: #endif not lint
        !            10: /*
        !            11:  * Begin execution.
        !            12:  *
        !            13:  * For px, pstart does a traced exec to read in px and then stop.  But we
        !            14:  * want control after px has read in the obj file and before it starts
        !            15:  * executing.  The zeroth argument to px tells it to give us control
        !            16:  * by sending itself a signal just prior to interpreting.
        !            17:  *
        !            18:  * We set a "END_BP" breakpoint at the end of the code so that the
        !            19:  * process data doesn't disappear after the program terminates.
        !            20:  */
        !            21: 
        !            22: #include "defs.h"
        !            23: #include <signal.h>
        !            24: #include "process.h"
        !            25: #include "machine.h"
        !            26: #include "main.h"
        !            27: #include "breakpoint.h"
        !            28: #include "source.h"
        !            29: #include "object.h"
        !            30: #include "mappings.h"
        !            31: #include "sym.h"
        !            32: #include "process.rep"
        !            33: 
        !            34: #   if (isvaxpx)
        !            35: #       include "pxinfo.h"
        !            36: #   endif
        !            37: 
        !            38: start(argv, infile, outfile)
        !            39: char **argv;
        !            40: char *infile, *outfile;
        !            41: {
        !            42:     char *cmd;
        !            43: 
        !            44:     setsigtrace();
        !            45: #   if (isvaxpx)
        !            46:        cmd = "px";
        !            47: #   else
        !            48:        cmd = argv[0];
        !            49: #   endif
        !            50:     pstart(process, cmd, argv, infile, outfile);
        !            51:     if (process->status == STOPPED) {
        !            52: #       if (isvaxpx)
        !            53:            TRAPARGS *ap, t;
        !            54: 
        !            55:            pcont(process);
        !            56:            if (process->status != STOPPED) {
        !            57:                if (option('t')) {
        !            58:                    quit(process->exitval);
        !            59:                } else {
        !            60:                    panic("px exited with %d", process->exitval);
        !            61:                }
        !            62:            }
        !            63:            dread(&ap, process->fp + 2*sizeof(int), sizeof(ap));
        !            64:            dread(&t, ap, sizeof(TRAPARGS));
        !            65:            if (t.nargs != 5) {
        !            66:                if (option('t')) {
        !            67:                    unsetsigtraces(process);
        !            68:                    pcont(process);
        !            69:                    quit(process->exitval);
        !            70:                } else {
        !            71:                    panic("start: args out of sync");
        !            72:                }
        !            73:            }
        !            74:            DISPLAY = t.disp;
        !            75:            DP = t.dp;
        !            76:            ENDOFF = t.objstart;
        !            77:            PCADDRP = t.pcaddrp;
        !            78:            LOOPADDR = t.loopaddr;
        !            79: #       endif
        !            80:        pc = 0;
        !            81:        curfunc = program;
        !            82:        if (objsize != 0) {
        !            83:            addbp(lastaddr(), END_BP, NIL, NIL, NIL, 0);
        !            84:        }
        !            85:     }
        !            86: }
        !            87: 
        !            88: /*
        !            89:  * Note the termination of the program.  We do this so as to avoid
        !            90:  * having the process exit, which would make the values of variables
        !            91:  * inaccessible.
        !            92:  *
        !            93:  * Although the END_BP should really be deleted, it is taken
        !            94:  * care of by fixbps the next time the program runs.
        !            95:  */
        !            96: 
        !            97: endprogram()
        !            98: {
        !            99:     if (ss_variables) {
        !           100:        prvarnews();
        !           101:     }
        !           102:     printf("\nexecution completed\n");
        !           103:     curfunc = program;
        !           104:     skimsource(srcfilename(pc));
        !           105:     curline = lastlinenum;
        !           106:     erecover();
        !           107: }
        !           108: 
        !           109: /*
        !           110:  * set up what signals we want to trace
        !           111:  */
        !           112: 
        !           113: LOCAL setsigtrace()
        !           114: {
        !           115:     register int i;
        !           116:     register PROCESS *p;
        !           117: 
        !           118:     p = process;
        !           119:     psigtrace(p, SIGINT, TRUE);
        !           120:     psigtrace(p, SIGTRAP, TRUE);
        !           121:     psigtrace(p, SIGIOT, TRUE);
        !           122:     psigtrace(p, SIGILL, TRUE);
        !           123:     psigtrace(p, SIGBUS, TRUE);
        !           124: }

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