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Annotation of kernel/bsd/miscfs/procfs/procfs_ctl.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
        !             7:  * Reserved.  This file contains Original Code and/or Modifications of
        !             8:  * Original Code as defined in and that are subject to the Apple Public
        !             9:  * Source License Version 1.1 (the "License").  You may not use this file
        !            10:  * except in compliance with the License.  Please obtain a copy of the
        !            11:  * License at http://www.apple.com/publicsource and read it before using
        !            12:  * this file.
        !            13:  * 
        !            14:  * The Original Code and all software distributed under the License are
        !            15:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            16:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            17:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            18:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            19:  * License for the specific language governing rights and limitations
        !            20:  * under the License.
        !            21:  * 
        !            22:  * @APPLE_LICENSE_HEADER_END@
        !            23:  */
        !            24: 
        !            25: /*     $NetBSD: procfs_ctl.c,v 1.12 1994/06/29 06:34:46 cgd Exp $      */
        !            26: 
        !            27: /*
        !            28:  * Copyright (c) 1993 Jan-Simon Pendry
        !            29:  * Copyright (c) 1993
        !            30:  *     The Regents of the University of California.  All rights reserved.
        !            31:  *
        !            32:  * This code is derived from software contributed to Berkeley by
        !            33:  * Jan-Simon Pendry.
        !            34:  *
        !            35:  * Redistribution and use in source and binary forms, with or without
        !            36:  * modification, are permitted provided that the following conditions
        !            37:  * are met:
        !            38:  * 1. Redistributions of source code must retain the above copyright
        !            39:  *    notice, this list of conditions and the following disclaimer.
        !            40:  * 2. Redistributions in binary form must reproduce the above copyright
        !            41:  *    notice, this list of conditions and the following disclaimer in the
        !            42:  *    documentation and/or other materials provided with the distribution.
        !            43:  * 3. All advertising materials mentioning features or use of this software
        !            44:  *    must display the following acknowledgement:
        !            45:  *     This product includes software developed by the University of
        !            46:  *     California, Berkeley and its contributors.
        !            47:  * 4. Neither the name of the University nor the names of its contributors
        !            48:  *    may be used to endorse or promote products derived from this software
        !            49:  *    without specific prior written permission.
        !            50:  *
        !            51:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            52:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            53:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            54:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            55:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            56:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            57:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            58:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            59:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            60:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            61:  * SUCH DAMAGE.
        !            62:  *
        !            63:  *     @(#)procfs_ctl.c        8.4 (Berkeley) 6/15/94
        !            64:  */
        !            65: 
        !            66: #include <sys/param.h>
        !            67: #include <sys/systm.h>
        !            68: #include <sys/time.h>
        !            69: #include <sys/kernel.h>
        !            70: #include <sys/proc.h>
        !            71: #include <sys/vnode.h>
        !            72: #include <sys/ioctl.h>
        !            73: #include <sys/tty.h>
        !            74: #include <sys/resource.h>
        !            75: #include <sys/resourcevar.h>
        !            76: #include <sys/ptrace.h>
        !            77: #include <miscfs/procfs/procfs.h>
        !            78: 
        !            79: /*
        !            80:  * True iff process (p) is in trace wait state
        !            81:  * relative to process (curp)
        !            82:  */
        !            83: #define TRACE_WAIT_P(curp, p) \
        !            84:        ((p)->p_stat == SSTOP && \
        !            85:         (p)->p_pptr == (curp) && \
        !            86:         ((p)->p_flag & P_TRACED))
        !            87: 
        !            88: #define PROCFS_CTL_ATTACH      1
        !            89: #define PROCFS_CTL_DETACH      2
        !            90: #define PROCFS_CTL_STEP                3
        !            91: #define PROCFS_CTL_RUN         4
        !            92: #define PROCFS_CTL_WAIT                5
        !            93: 
        !            94: static vfs_namemap_t ctlnames[] = {
        !            95:        /* special /proc commands */
        !            96:        { "attach",     PROCFS_CTL_ATTACH },
        !            97:        { "detach",     PROCFS_CTL_DETACH },
        !            98:        { "step",       PROCFS_CTL_STEP },
        !            99:        { "run",        PROCFS_CTL_RUN },
        !           100:        { "wait",       PROCFS_CTL_WAIT },
        !           101:        { 0 },
        !           102: };
        !           103: 
        !           104: static vfs_namemap_t signames[] = {
        !           105:        /* regular signal names */
        !           106:        { "hup",        SIGHUP },       { "int",        SIGINT },
        !           107:        { "quit",       SIGQUIT },      { "ill",        SIGILL },
        !           108:        { "trap",       SIGTRAP },      { "abrt",       SIGABRT },
        !           109:        { "iot",        SIGIOT },       { "emt",        SIGEMT },
        !           110:        { "fpe",        SIGFPE },       { "kill",       SIGKILL },
        !           111:        { "bus",        SIGBUS },       { "segv",       SIGSEGV },
        !           112:        { "sys",        SIGSYS },       { "pipe",       SIGPIPE },
        !           113:        { "alrm",       SIGALRM },      { "term",       SIGTERM },
        !           114:        { "urg",        SIGURG },       { "stop",       SIGSTOP },
        !           115:        { "tstp",       SIGTSTP },      { "cont",       SIGCONT },
        !           116:        { "chld",       SIGCHLD },      { "ttin",       SIGTTIN },
        !           117:        { "ttou",       SIGTTOU },      { "io",         SIGIO },
        !           118:        { "xcpu",       SIGXCPU },      { "xfsz",       SIGXFSZ },
        !           119:        { "vtalrm",     SIGVTALRM },    { "prof",       SIGPROF },
        !           120:        { "winch",      SIGWINCH },     { "info",       SIGINFO },
        !           121:        { "usr1",       SIGUSR1 },      { "usr2",       SIGUSR2 },
        !           122:        { 0 },
        !           123: };
        !           124: 
        !           125: static int
        !           126: procfs_control(curp, p, op)
        !           127:        struct proc *curp;
        !           128:        struct proc *p;
        !           129:        int op;
        !           130: {
        !           131:        int error;
        !           132: 
        !           133:        /*
        !           134:         * Attach - attaches the target process for debugging
        !           135:         * by the calling process.
        !           136:         */
        !           137:        if (op == PROCFS_CTL_ATTACH) {
        !           138:                /* check whether already being traced */
        !           139:                if (p->p_flag & P_TRACED)
        !           140:                        return (EBUSY);
        !           141: 
        !           142:                /* can't trace yourself! */
        !           143:                if (p->p_pid == curp->p_pid)
        !           144:                        return (EINVAL);
        !           145: 
        !           146:                /*
        !           147:                 * Go ahead and set the trace flag.
        !           148:                 * Save the old parent (it's reset in
        !           149:                 *   _DETACH, and also in kern_exit.c:wait4()
        !           150:                 * Reparent the process so that the tracing
        !           151:                 *   proc gets to see all the action.
        !           152:                 * Stop the target.
        !           153:                 */
        !           154:                p->p_flag |= P_TRACED;
        !           155:                p->p_xstat = 0;         /* XXX ? */
        !           156:                if (p->p_pptr != curp) {
        !           157:                        p->p_oppid = p->p_pptr->p_pid;
        !           158:                        proc_reparent(p, curp);
        !           159:                }
        !           160:                psignal(p, SIGSTOP);
        !           161:                return (0);
        !           162:        }
        !           163: 
        !           164:        /*
        !           165:         * Target process must be stopped, owned by (curp) and
        !           166:         * be set up for tracing (P_TRACED flag set).
        !           167:         * Allow DETACH to take place at any time for sanity.
        !           168:         * Allow WAIT any time, of course.
        !           169:         */
        !           170:        switch (op) {
        !           171:        case PROCFS_CTL_DETACH:
        !           172:        case PROCFS_CTL_WAIT:
        !           173:                break;
        !           174: 
        !           175:        default:
        !           176:                if (!TRACE_WAIT_P(curp, p))
        !           177:                        return (EBUSY);
        !           178:        }
        !           179: 
        !           180:        /*
        !           181:         * do single-step fixup if needed
        !           182:         */
        !           183:        FIX_SSTEP(p);
        !           184: 
        !           185:        /*
        !           186:         * Don't deliver any signal by default.
        !           187:         * To continue with a signal, just send
        !           188:         * the signal name to the ctl file
        !           189:         */
        !           190:        p->p_xstat = 0;
        !           191: 
        !           192:        switch (op) {
        !           193:        /*
        !           194:         * Detach.  Cleans up the target process, reparent it if possible
        !           195:         * and set it running once more.
        !           196:         */
        !           197:        case PROCFS_CTL_DETACH:
        !           198:                /* if not being traced, then this is a painless no-op */
        !           199:                if ((p->p_flag & P_TRACED) == 0)
        !           200:                        return (0);
        !           201: 
        !           202:                /* not being traced any more */
        !           203:                p->p_flag &= ~P_TRACED;
        !           204: 
        !           205:                /* give process back to original parent */
        !           206:                if (p->p_oppid != p->p_pptr->p_pid) {
        !           207:                        struct proc *pp;
        !           208: 
        !           209:                        pp = pfind(p->p_oppid);
        !           210:                        if (pp)
        !           211:                                proc_reparent(p, pp);
        !           212:                }
        !           213: 
        !           214:                p->p_oppid = 0;
        !           215:                p->p_flag &= ~P_WAITED; /* XXX ? */
        !           216:                wakeup((caddr_t) curp); /* XXX for CTL_WAIT below ? */
        !           217: 
        !           218:                break;
        !           219: 
        !           220:        /*
        !           221:         * Step.  Let the target process execute a single instruction.
        !           222:         */
        !           223:        case PROCFS_CTL_STEP:
        !           224:                if (error = process_sstep(p, 1))
        !           225:                        return (error);
        !           226:                break;
        !           227: 
        !           228:        /*
        !           229:         * Run.  Let the target process continue running until a breakpoint
        !           230:         * or some other trap.
        !           231:         */
        !           232:        case PROCFS_CTL_RUN:
        !           233:                break;
        !           234: 
        !           235:        /*
        !           236:         * Wait for the target process to stop.
        !           237:         * If the target is not being traced then just wait
        !           238:         * to enter
        !           239:         */
        !           240:        case PROCFS_CTL_WAIT:
        !           241:                error = 0;
        !           242:                if (p->p_flag & P_TRACED) {
        !           243:                        while (error == 0 &&
        !           244:                                        (p->p_stat != SSTOP) &&
        !           245:                                        (p->p_flag & P_TRACED) &&
        !           246:                                        (p->p_pptr == curp)) {
        !           247:                                error = tsleep((caddr_t) p,
        !           248:                                                PWAIT|PCATCH, "procfsx", 0);
        !           249:                        }
        !           250:                        if (error == 0 && !TRACE_WAIT_P(curp, p))
        !           251:                                error = EBUSY;
        !           252:                } else {
        !           253:                        while (error == 0 && p->p_stat != SSTOP) {
        !           254:                                error = tsleep((caddr_t) p,
        !           255:                                                PWAIT|PCATCH, "procfs", 0);
        !           256:                        }
        !           257:                }
        !           258:                return (error);
        !           259: 
        !           260:        default:
        !           261:                panic("procfs_control");
        !           262:        }
        !           263: 
        !           264:        if (p->p_stat == SSTOP)
        !           265:                setrunnable(p);
        !           266:        return (0);
        !           267: }
        !           268: 
        !           269: int
        !           270: procfs_doctl(curp, p, pfs, uio)
        !           271:        struct proc *curp;
        !           272:        struct pfsnode *pfs;
        !           273:        struct uio *uio;
        !           274:        struct proc *p;
        !           275: {
        !           276:        int xlen;
        !           277:        int error;
        !           278:        char msg[PROCFS_CTLLEN+1];
        !           279:        vfs_namemap_t *nm;
        !           280: 
        !           281:        if (uio->uio_rw != UIO_WRITE)
        !           282:                return (EOPNOTSUPP);
        !           283: 
        !           284:        xlen = PROCFS_CTLLEN;
        !           285:        error = vfs_getuserstr(uio, msg, &xlen);
        !           286:        if (error)
        !           287:                return (error);
        !           288: 
        !           289:        /*
        !           290:         * Map signal names into signal generation
        !           291:         * or debug control.  Unknown commands and/or signals
        !           292:         * return EOPNOTSUPP.
        !           293:         *
        !           294:         * Sending a signal while the process is being debugged
        !           295:         * also has the side effect of letting the target continue
        !           296:         * to run.  There is no way to single-step a signal delivery.
        !           297:         */
        !           298:        error = EOPNOTSUPP;
        !           299: 
        !           300:        nm = vfs_findname(ctlnames, msg, xlen);
        !           301:        if (nm) {
        !           302:                error = procfs_control(curp, p, nm->nm_val);
        !           303:        } else {
        !           304:                nm = vfs_findname(signames, msg, xlen);
        !           305:                if (nm) {
        !           306:                        if (TRACE_WAIT_P(curp, p)) {
        !           307:                                p->p_xstat = nm->nm_val;
        !           308:                                FIX_SSTEP(p);
        !           309:                                setrunnable(p);
        !           310:                        } else {
        !           311:                                psignal(p, nm->nm_val);
        !           312:                        }
        !           313:                        error = 0;
        !           314:                }
        !           315:        }
        !           316: 
        !           317:        return (error);
        !           318: }

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