Return to gcore.c CVS log

Up to [CSRG BSD Unix] / 43BSDReno / pgrm / gcore

Annotation of 43BSDReno/pgrm/gcore/gcore.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1982 The Regents of the University of California.
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * Redistribution and use in source and binary forms are permitted
        !             6:  * provided that: (1) source distributions retain this entire copyright
        !             7:  * notice and comment, and (2) distributions including binaries display
        !             8:  * the following acknowledgement:  ``This product includes software
        !             9:  * developed by the University of California, Berkeley and its contributors''
        !            10:  * in the documentation or other materials provided with the distribution
        !            11:  * and in all advertising materials mentioning features or use of this
        !            12:  * software. Neither the name of the University nor the names of its
        !            13:  * contributors may be used to endorse or promote products derived
        !            14:  * from this software without specific prior written permission.
        !            15:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
        !            16:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
        !            17:  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            18:  */
        !            19: 
        !            20: #ifndef lint
        !            21: char copyright[] =
        !            22: "@(#) Copyright (c) 1982 The Regents of the University of California.\n\
        !            23:  All rights reserved.\n";
        !            24: #endif /* not lint */
        !            25: 
        !            26: #ifndef lint
        !            27: static char sccsid[] = "@(#)gcore.c    5.6 (Berkeley) 6/1/90";
        !            28: #endif /* not lint */
        !            29: 
        !            30: /*
        !            31:  * gcore - get core images of running processes
        !            32:  *
        !            33:  * Author: Eric Cooper
        !            34:  * Written: Fall 1981.
        !            35:  *
        !            36:  * Inspired by a version 6 program by Len Levin, 1978.
        !            37:  * Several pieces of code lifted from Bill Joy's 4BSD ps.
        !            38:  *
        !            39:  * Permission to copy or modify this program in whole or in part is hereby
        !            40:  * granted, provided that the above credits are preserved.
        !            41:  *
        !            42:  * This code performs a simple simulation of the virtual memory system in user
        !            43:  * code.  If the virtual memory system changes, this program must be modified
        !            44:  * accordingly.  It must also be recompiled whenever system data structures
        !            45:  * change.
        !            46:  */
        !            47: #include <machine/pte.h>
        !            48: #include <sys/param.h>
        !            49: #include <sys/user.h>
        !            50: #include <sys/proc.h>
        !            51: #include <sys/vm.h>
        !            52: #include <setjmp.h>
        !            53: #include <stdio.h>
        !            54: #include <nlist.h>
        !            55: 
        !            56: /* Various macros for efficiency. */
        !            57: 
        !            58: #define        min(a, b)       (a < b ? a : b)
        !            59: 
        !            60: #define        Seek(f, pos) {\
        !            61:        if (lseek(f, (long) (pos), 0) != (long) (pos)) \
        !            62:                panic("seek error"); \
        !            63: }
        !            64: 
        !            65: #define        Read(f, addr, n) {\
        !            66:        if (read(f, (char *) (addr), (int) (n)) != (int) (n)) \
        !            67:                panic("read error"); \
        !            68: }
        !            69: 
        !            70: #define        Get(f, pos, addr, n) {\
        !            71:        Seek(f, pos); \
        !            72:        Read(f, addr, n); \
        !            73: }
        !            74: 
        !            75: struct nlist nl[] = {
        !            76:        { "_proc" },
        !            77: #define        X_PROC          0
        !            78:        { "_Usrptmap" },
        !            79: #define        X_USRPTMA       1
        !            80:        { "_usrpt" },
        !            81: #define        X_USRPT         2
        !            82:        { "_nswap" },
        !            83: #define        X_NSWAP         3
        !            84:        { "_nproc" },
        !            85: #define        X_NPROC         4
        !            86:        { "_dmmin" },
        !            87: #define        X_DMMIN         5
        !            88:        { "_dmmax" },
        !            89: #define        X_DMMAX         6
        !            90:        { 0 },
        !            91: };
        !            92: 
        !            93: #define FEW    20              /* for fewer system calls */
        !            94: struct proc proc[FEW];
        !            95: 
        !            96: union {
        !            97:        struct user user;
        !            98:        char upages[UPAGES][NBPG];
        !            99: } user;
        !           100: #define u      user.user
        !           101: #define uarea  user.upages
        !           102: 
        !           103: #define NLIST  "/vmunix"
        !           104: #define KMEM   "/dev/kmem"
        !           105: #define MEM    "/dev/mem"
        !           106: #define SWAP   "/dev/drum"     /* "/dev/swap" on some systems */
        !           107: 
        !           108: int    nproc;
        !           109: int    nswap;
        !           110: int    dmmin, dmmax;
        !           111: struct pte *Usrptmap, *usrpt;
        !           112: char   coref[20];
        !           113: int    kmem, mem, swap, cor;
        !           114: jmp_buf        cont_frame;
        !           115: 
        !           116: main(argc, argv)
        !           117:        int argc;
        !           118:        char **argv;
        !           119: {
        !           120:        register int i, j;
        !           121:        register struct proc *p;
        !           122:        off_t procbase, procp;
        !           123:        int pid, uid;
        !           124:        char c;
        !           125: 
        !           126:        if (argc < 2) {
        !           127:                printf("Usage: %s pid ...\n", argv[0]);
        !           128:                exit(1);
        !           129:        }
        !           130:        openfiles();
        !           131:        getkvars();
        !           132:        procbase = getw(nl[X_PROC].n_value);
        !           133:        nproc = getw(nl[X_NPROC].n_value);
        !           134:        nswap = getw(nl[X_NSWAP].n_value);
        !           135:        dmmin = getw(nl[X_DMMIN].n_value);
        !           136:        dmmax = getw(nl[X_DMMAX].n_value);
        !           137:        while (--argc > 0) {
        !           138:                if ((pid = atoi(*++argv)) <= 0 || setjmp(cont_frame))
        !           139:                        continue;
        !           140:                printf("%d: ", pid);
        !           141:                procp = procbase;
        !           142:                for (i = 0; i < nproc; i += FEW) {
        !           143:                        Seek(kmem, procp);
        !           144:                        j = nproc - i;
        !           145:                        if (j > FEW)
        !           146:                                j = FEW;
        !           147:                        j *= sizeof(struct proc);
        !           148:                        Read(kmem, (char *) proc, j);
        !           149:                        procp += j;
        !           150:                        for (j = j / sizeof(struct proc) - 1; j >= 0; j--) {
        !           151:                                p = &proc[j];
        !           152:                                if (p->p_pid == pid)
        !           153:                                        goto found;
        !           154:                        }
        !           155:                }
        !           156:                printf("Process not found.\n");
        !           157:                continue;
        !           158:        found:
        !           159:                if (p->p_uid != (uid = getuid()) && uid != 0) {
        !           160:                        printf("Not owner.\n");
        !           161:                        continue;
        !           162:                }
        !           163:                if (p->p_stat == SZOMB) {
        !           164:                        printf("Zombie.\n");
        !           165:                        continue;
        !           166:                }
        !           167:                if (p->p_flag & SWEXIT)
        !           168:                        printf("Warning: process exiting.\n");
        !           169:                if (p->p_flag & SSYS) {
        !           170:                        printf("System process.\n");
        !           171:                        /* i.e. swapper or pagedaemon */
        !           172:                        continue;
        !           173:                }
        !           174:                sprintf(coref, "core.%d", pid);
        !           175:                if ((cor = creat(coref, 0666)) < 0) {
        !           176:                        perror(coref);
        !           177:                        exit(1);
        !           178:                }
        !           179:                core(p);
        !           180:                close(cor);
        !           181:                printf("%s dumped\n", coref);
        !           182:        }
        !           183: }
        !           184: 
        !           185: getw(loc)
        !           186:        off_t loc;
        !           187: {
        !           188:        int word;
        !           189: 
        !           190:        Get(kmem, loc, &word, sizeof(int));
        !           191:        return (word);
        !           192: }
        !           193: 
        !           194: openfiles()
        !           195: {
        !           196:        kmem = open(KMEM, 0);
        !           197:        if (kmem < 0) {
        !           198:                perror(KMEM);
        !           199:                exit(1);
        !           200:        }
        !           201:        mem = open(MEM, 0);
        !           202:        if (mem < 0) {
        !           203:                perror(MEM);
        !           204:                exit(1);
        !           205:        }
        !           206:        swap = open(SWAP, 0);
        !           207:        if (swap < 0) {
        !           208:                perror(SWAP);
        !           209:                exit(1);
        !           210:        }
        !           211: }
        !           212: 
        !           213: getkvars()
        !           214: {
        !           215:        nlist(NLIST, nl);
        !           216:        if (nl[0].n_type == 0) {
        !           217:                printf("%s: No namelist\n", NLIST);
        !           218:                exit(1);
        !           219:        }
        !           220:        Usrptmap = (struct pte *) nl[X_USRPTMA].n_value;
        !           221:        usrpt = (struct pte *) nl[X_USRPT].n_value;
        !           222: }
        !           223: 
        !           224: /*
        !           225:  * Get the system page table entries (mapping the user page table).
        !           226:  * These are the entries Usrptmap[i .. i + szpt],
        !           227:  * where i = btokmx(p->p_p0br) and szpt = p->p_szpt.
        !           228:  * For our purposes, we can skip over the ptes mapping
        !           229:  * the text segment ptes.
        !           230:  */
        !           231: struct pte     *syspt;         /* pte's from Usrptmap */
        !           232: int            nsysptes;
        !           233: 
        !           234: getsyspt(p)
        !           235:        register struct proc *p;
        !           236: {
        !           237:        nsysptes = p->p_szpt - (p->p_tsize / NPTEPG);
        !           238:        syspt = (struct pte *) malloc(nsysptes * sizeof(struct pte));
        !           239:        if (syspt == NULL)
        !           240:                panic("can't alloc %d page table entries", nsysptes);
        !           241:        Get(kmem, &Usrptmap[btokmx(p->p_p0br) + (p->p_tsize / NPTEPG)],
        !           242:                syspt, nsysptes * sizeof(struct pte));
        !           243: }
        !           244: 
        !           245: /*
        !           246:  * Get the user page table for a segment.
        !           247:  * seg 0 = p0 (not including text)
        !           248:  * seg 1 = p1 (stack and u area)
        !           249:  * The system pt is consulted to find each page of user ptes.
        !           250:  */
        !           251: struct pte *
        !           252: getpt(p, seg)
        !           253:        register struct proc *p;
        !           254:        int seg;
        !           255: {
        !           256:        register int i;
        !           257:        register struct pte *spt;
        !           258:        struct pte *pt;
        !           259:        int nptes, offset, n;
        !           260: 
        !           261:        if (seg == 0) {
        !           262:                nptes = p->p_dsize;
        !           263:                spt = syspt;
        !           264:                offset = p->p_tsize % NPTEPG;
        !           265:        } else {
        !           266:                nptes = p->p_ssize + UPAGES;
        !           267:                spt = syspt + (nsysptes - ctopt(nptes));
        !           268:                offset = -nptes % NPTEPG;
        !           269:                if (offset < 0)
        !           270:                        offset += NPTEPG;
        !           271:        }
        !           272:        pt = (struct pte *) malloc(nptes * sizeof(struct pte));
        !           273:        if (pt == NULL)
        !           274:                panic("can't alloc %d page table entries", nptes);
        !           275:        for (i = 0; i < nptes; i += n) {
        !           276:                n = min(NPTEPG - offset, nptes - i);
        !           277:                Get(mem, ctob(spt->pg_pfnum) + offset * sizeof(struct pte),
        !           278:                     pt + i, n * sizeof(struct pte));
        !           279:                spt++;
        !           280:                offset = 0;
        !           281:        }
        !           282:        return (pt);
        !           283: }
        !           284: 
        !           285: /*
        !           286:  * Build the core file.
        !           287:  */
        !           288: core(p)
        !           289:        register struct proc *p;
        !           290: {
        !           291:        register struct pte *p0, *p1;
        !           292: 
        !           293:        if (p->p_flag & SLOAD) {                /* page tables are resident */
        !           294:                getsyspt(p);
        !           295:                p0 = getpt(p, 0);
        !           296:                p1 = getpt(p, 1);
        !           297: #ifdef DEBUG
        !           298:                showpt(syspt, nsysptes, "system");
        !           299:                showpt(p0, p->p_dsize, "p0");
        !           300:                showpt(p1, p->p_ssize + UPAGES, "p1");
        !           301: #endif
        !           302:        }
        !           303:        getu(p, &p1[p->p_ssize]);                       /* u area */
        !           304:        getseg(p, p->p_dsize, p0, &u.u_dmap, 0);        /* data */
        !           305:        getseg(p, p->p_ssize, p1, &u.u_smap, 1);        /* stack */
        !           306:        if (p->p_flag & SLOAD) {
        !           307:                free((char *) syspt);
        !           308:                free((char *) p0);
        !           309:                free((char *) p1);
        !           310:        }
        !           311: }
        !           312: 
        !           313: /*
        !           314:  * Get the u area.
        !           315:  * Keeps around the u structure for later use
        !           316:  * (the data and stack disk map structures).
        !           317:  */
        !           318: getu(p, pages)
        !           319:        register struct proc *p;
        !           320:        register struct pte *pages;
        !           321: {
        !           322:        register int i;
        !           323: 
        !           324:        if ((p->p_flag & SLOAD) == 0) {
        !           325:                Get(swap, ctob(p->p_swaddr), uarea, ctob(UPAGES));
        !           326:                write(cor, uarea, ctob(UPAGES));
        !           327:                return;
        !           328:        }
        !           329:        for (i = 0; i < UPAGES; i += CLSIZE) {
        !           330:                Get(mem, ctob(pages[i].pg_pfnum), uarea[i], ctob(CLSIZE));
        !           331:                write(cor, uarea[i], ctob(CLSIZE));
        !           332:        }
        !           333: }
        !           334: 
        !           335: /*
        !           336:  * Copy a segment to the core file.
        !           337:  * The segment is described by its size in clicks,
        !           338:  * its page table, its disk map, and whether or not
        !           339:  * it grows backwards.
        !           340:  * Note that the page table address is allowed to be meaningless
        !           341:  * if the process is swapped out.
        !           342:  */
        !           343: getseg(p, segsize, pages, map, rev)
        !           344:        register struct proc *p;
        !           345:        int segsize;
        !           346:        register struct pte *pages;
        !           347:        struct dmap *map;
        !           348: {
        !           349:        register int i;
        !           350:        struct dblock db;
        !           351:        int size;
        !           352:        char buf[ctob(CLSIZE)];
        !           353: 
        !           354:        for (i = 0; i < segsize; i += CLSIZE) {
        !           355:                size = min(CLSIZE, segsize - i);
        !           356:                if ((p->p_flag & SLOAD) == 0 || pages[i].pg_fod ||
        !           357:                    pages[i].pg_pfnum == 0) {
        !           358:                        vstodb(i, size, map, &db, rev);
        !           359:                        Get(swap, ctob(db.db_base), buf, ctob(size));
        !           360:                        write(cor, buf, ctob(size));
        !           361:                } else {
        !           362:                        Get(mem, ctob(pages[i].pg_pfnum), buf, ctob(size));
        !           363:                        write(cor, buf, ctob(size));
        !           364:                }
        !           365:        }
        !           366: }
        !           367: 
        !           368: /*
        !           369:  * Given a base/size pair in virtual swap area,
        !           370:  * return a physical base/size pair which is the
        !           371:  * (largest) initial, physically contiguous block.
        !           372:  */
        !           373: vstodb(vsbase, vssize, dmp, dbp, rev)
        !           374:        register int vsbase;
        !           375:        int vssize;
        !           376:        struct dmap *dmp;
        !           377:        register struct dblock *dbp;
        !           378: {
        !           379:        register int blk = dmmin;
        !           380:        register swblk_t *ip = dmp->dm_map;
        !           381: 
        !           382:        if (vsbase < 0 || vsbase + vssize > dmp->dm_size)
        !           383:                panic("can't make sense out of virtual memory (gcore probably needs to be recompiled)");
        !           384:        while (vsbase >= blk) {
        !           385:                vsbase -= blk;
        !           386:                if (blk < dmmax)
        !           387:                        blk *= 2;
        !           388:                ip++;
        !           389:        }
        !           390:        if (*ip <= 0 || *ip + blk > nswap)
        !           391:                panic("vstodb *ip");
        !           392:        dbp->db_size = MIN(vssize, blk - vsbase);
        !           393:        dbp->db_base = *ip + (rev ? blk - (vsbase + dbp->db_size) : vsbase);
        !           394: }
        !           395: 
        !           396: /*VARARGS1*/
        !           397: panic(cp, a, b, c, d)
        !           398:        char *cp;
        !           399: {
        !           400:        printf(cp, a, b, c, d);
        !           401:        printf("\n");
        !           402:        longjmp(cont_frame, 1);
        !           403: }
        !           404: 
        !           405: /* 
        !           406:  * Debugging routine to print out page table.
        !           407:  */
        !           408: #ifdef DEBUG
        !           409: showpt(pt, n, s)
        !           410:        struct pte *pt;
        !           411:        int n;
        !           412:        char *s;
        !           413: {
        !           414:        register struct pte *p;
        !           415:        register int i;
        !           416: 
        !           417:        printf("*** %s page table\n", s);
        !           418:        for (i = 0, p = pt; i < n; i++, p++)
        !           419:                if (! p->pg_fod)
        !           420:                        printf("%d: %x\n", i, p->pg_pfnum);
        !           421: }
        !           422: #endif

This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.