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Annotation of 42BSD/ucb/pascal/pdx/process/start.c, revision 1.1

1.1     ! root        1: /* Copyright (c) 1982 Regents of the University of California */
        !             2: 
        !             3: static char sccsid[] = "@(#)start.c 1.7 3/8/82";
        !             4: 
        !             5: /*
        !             6:  * Begin execution.
        !             7:  *
        !             8:  * For px, pstart does a traced exec to read in px and then stop.  But we
        !             9:  * want control after px has read in the obj file and before it starts
        !            10:  * executing.  The zeroth argument to px tells it to give us control
        !            11:  * by sending itself a signal just prior to interpreting.
        !            12:  *
        !            13:  * We set a "END_BP" breakpoint at the end of the code so that the
        !            14:  * process data doesn't disappear after the program terminates.
        !            15:  */
        !            16: 
        !            17: #include "defs.h"
        !            18: #include <signal.h>
        !            19: #include "process.h"
        !            20: #include "machine.h"
        !            21: #include "main.h"
        !            22: #include "breakpoint.h"
        !            23: #include "source.h"
        !            24: #include "object.h"
        !            25: #include "mappings.h"
        !            26: #include "sym.h"
        !            27: #include "process.rep"
        !            28: 
        !            29: #   if (isvaxpx)
        !            30: #       include "pxinfo.h"
        !            31: #   endif
        !            32: 
        !            33: start(argv, infile, outfile)
        !            34: char **argv;
        !            35: char *infile, *outfile;
        !            36: {
        !            37:     char *cmd;
        !            38: 
        !            39:     setsigtrace();
        !            40: #   if (isvaxpx)
        !            41:        cmd = "px";
        !            42: #   else
        !            43:        cmd = argv[0];
        !            44: #   endif
        !            45:     pstart(process, cmd, argv, infile, outfile);
        !            46:     if (process->status == STOPPED) {
        !            47: #       if (isvaxpx)
        !            48:            TRAPARGS *ap, t;
        !            49: 
        !            50:            pcont(process);
        !            51:            if (process->status != STOPPED) {
        !            52:                if (option('t')) {
        !            53:                    quit(process->exitval);
        !            54:                } else {
        !            55:                    panic("px exited with %d", process->exitval);
        !            56:                }
        !            57:            }
        !            58:            dread(&ap, process->fp + 2*sizeof(int), sizeof(ap));
        !            59:            dread(&t, ap, sizeof(TRAPARGS));
        !            60:            if (t.nargs != 5) {
        !            61:                if (option('t')) {
        !            62:                    unsetsigtraces(process);
        !            63:                    pcont(process);
        !            64:                    quit(process->exitval);
        !            65:                } else {
        !            66:                    panic("start: args out of sync");
        !            67:                }
        !            68:            }
        !            69:            DISPLAY = t.disp;
        !            70:            DP = t.dp;
        !            71:            ENDOFF = t.objstart;
        !            72:            PCADDRP = t.pcaddrp;
        !            73:            LOOPADDR = t.loopaddr;
        !            74: #       endif
        !            75:        pc = 0;
        !            76:        curfunc = program;
        !            77:        if (objsize != 0) {
        !            78:            addbp(lastaddr(), END_BP, NIL, NIL, NIL, 0);
        !            79:        }
        !            80:     }
        !            81: }
        !            82: 
        !            83: /*
        !            84:  * Note the termination of the program.  We do this so as to avoid
        !            85:  * having the process exit, which would make the values of variables
        !            86:  * inaccessible.
        !            87:  *
        !            88:  * Although the END_BP should really be deleted, it is taken
        !            89:  * care of by fixbps the next time the program runs.
        !            90:  */
        !            91: 
        !            92: endprogram()
        !            93: {
        !            94:     if (ss_variables) {
        !            95:        prvarnews();
        !            96:     }
        !            97:     printf("\nexecution completed\n");
        !            98:     curfunc = program;
        !            99:     skimsource(srcfilename(pc));
        !           100:     curline = lastlinenum;
        !           101:     erecover();
        !           102: }
        !           103: 
        !           104: /*
        !           105:  * set up what signals we want to trace
        !           106:  */
        !           107: 
        !           108: LOCAL setsigtrace()
        !           109: {
        !           110:     register int i;
        !           111:     register PROCESS *p;
        !           112: 
        !           113:     p = process;
        !           114:     psigtrace(p, SIGINT, TRUE);
        !           115:     psigtrace(p, SIGTRAP, TRUE);
        !           116:     psigtrace(p, SIGIOT, TRUE);
        !           117:     psigtrace(p, SIGILL, TRUE);
        !           118:     psigtrace(p, SIGBUS, TRUE);
        !           119: }

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