procfs_status.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-3-Clause
    3  *
    4  * Copyright (c) 1993 Jan-Simon Pendry
    5  * Copyright (c) 1993
    6  *      The Regents of the University of California.  All rights reserved.
    7  *
    8  * This code is derived from software contributed to Berkeley by
    9  * Jan-Simon Pendry.
   10  *
   11  * Redistribution and use in source and binary forms, with or without
   12  * modification, are permitted provided that the following conditions
   13  * are met:
   14  * 1. Redistributions of source code must retain the above copyright
   15  *    notice, this list of conditions and the following disclaimer.
   16  * 2. Redistributions in binary form must reproduce the above copyright
   17  *    notice, this list of conditions and the following disclaimer in the
   18  *    documentation and/or other materials provided with the distribution.
   19  * 3. Neither the name of the University nor the names of its contributors
   20  *    may be used to endorse or promote products derived from this software
   21  *    without specific prior written permission.
   22  *
   23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   33  * SUCH DAMAGE.
   34  *
   35  *      @(#)procfs_status.c     8.4 (Berkeley) 6/15/94
   36  *
   37  * From:
   38  *      $Id: procfs_status.c,v 3.1 1993/12/15 09:40:17 jsp Exp $
   39  * $FreeBSD$
   40  */
   41 
   42 #include <sys/param.h>
   43 #include <sys/kernel.h>
   44 #include <sys/systm.h>
   45 #include <sys/exec.h>
   46 #include <sys/lock.h>
   47 #include <sys/mutex.h>
   48 #include <sys/jail.h>
   49 #include <sys/malloc.h>
   50 #include <sys/mutex.h>
   51 #include <sys/sx.h>
   52 #include <sys/proc.h>
   53 #include <sys/resourcevar.h>
   54 #include <sys/sbuf.h>
   55 #include <sys/tty.h>
   56 
   57 #include <vm/vm.h>
   58 #include <vm/pmap.h>
   59 #include <vm/vm_param.h>
   60 
   61 #include <fs/pseudofs/pseudofs.h>
   62 #include <fs/procfs/procfs.h>
   63 
   64 int
   65 procfs_doprocstatus(PFS_FILL_ARGS)
   66 {
   67         struct session *sess;
   68         struct thread *tdfirst;
   69         struct tty *tp;
   70         struct ucred *cr;
   71         const char *wmesg;
   72         char *pc;
   73         char *sep;
   74         struct timeval boottime;
   75         int pid, ppid, pgid, sid;
   76         int i;
   77 
   78         pid = p->p_pid;
   79         PROC_LOCK(p);
   80         ppid = p->p_pptr ? p->p_pptr->p_pid : 0;
   81         pgid = p->p_pgrp->pg_id;
   82         sess = p->p_pgrp->pg_session;
   83         SESS_LOCK(sess);
   84         sid = sess->s_leader ? sess->s_leader->p_pid : 0;
   85 
   86 /* comm pid ppid pgid sid tty ctty,sldr start ut st wmsg
   87                                 euid ruid rgid,egid,groups[1 .. ngroups]
   88 */
   89 
   90         pc = p->p_comm;
   91         do {
   92                 if (*pc < 33 || *pc > 126 || *pc == '\\')
   93                         sbuf_printf(sb, "\\%03o", *pc);
   94                 else
   95                         sbuf_putc(sb, *pc);
   96         } while (*++pc);
   97         sbuf_printf(sb, " %d %d %d %d ", pid, ppid, pgid, sid);
   98         if ((p->p_flag & P_CONTROLT) && (tp = sess->s_ttyp))
   99                 sbuf_printf(sb, "%s ", devtoname(tp->t_dev));
  100         else
  101                 sbuf_printf(sb, "- ");
  102 
  103         sep = "";
  104         if (sess->s_ttyvp) {
  105                 sbuf_printf(sb, "%sctty", sep);
  106                 sep = ",";
  107         }
  108         if (SESS_LEADER(p)) {
  109                 sbuf_printf(sb, "%ssldr", sep);
  110                 sep = ",";
  111         }
  112         SESS_UNLOCK(sess);
  113         if (*sep != ',') {
  114                 sbuf_printf(sb, "noflags");
  115         }
  116 
  117         tdfirst = FIRST_THREAD_IN_PROC(p);
  118         thread_lock(tdfirst);
  119         if (tdfirst->td_wchan != NULL) {
  120                 KASSERT(tdfirst->td_wmesg != NULL,
  121                     ("wchan %p has no wmesg", tdfirst->td_wchan));
  122                 wmesg = tdfirst->td_wmesg;
  123         } else
  124                 wmesg = "nochan";
  125         thread_unlock(tdfirst);
  126 
  127         if (p->p_flag & P_INMEM) {
  128                 struct timeval start, ut, st;
  129 
  130                 PROC_STATLOCK(p);
  131                 calcru(p, &ut, &st);
  132                 PROC_STATUNLOCK(p);
  133                 start = p->p_stats->p_start;
  134                 getboottime(&boottime);
  135                 timevaladd(&start, &boottime);
  136                 sbuf_printf(sb, " %jd,%ld %jd,%ld %jd,%ld",
  137                     (intmax_t)start.tv_sec, start.tv_usec,
  138                     (intmax_t)ut.tv_sec, ut.tv_usec,
  139                     (intmax_t)st.tv_sec, st.tv_usec);
  140         } else
  141                 sbuf_printf(sb, " -1,-1 -1,-1 -1,-1");
  142 
  143         sbuf_printf(sb, " %s", wmesg);
  144 
  145         cr = p->p_ucred;
  146 
  147         sbuf_printf(sb, " %lu %lu %lu",
  148                 (u_long)cr->cr_uid,
  149                 (u_long)cr->cr_ruid,
  150                 (u_long)cr->cr_rgid);
  151 
  152         /* egid (cr->cr_svgid) is equal to cr_ngroups[0]
  153            see also getegid(2) in /sys/kern/kern_prot.c */
  154 
  155         for (i = 0; i < cr->cr_ngroups; i++) {
  156                 sbuf_printf(sb, ",%lu", (u_long)cr->cr_groups[i]);
  157         }
  158 
  159         if (jailed(cr)) {
  160                 mtx_lock(&cr->cr_prison->pr_mtx);
  161                 sbuf_printf(sb, " %s",
  162                     prison_name(td->td_ucred->cr_prison, cr->cr_prison));
  163                 mtx_unlock(&cr->cr_prison->pr_mtx);
  164         } else {
  165                 sbuf_printf(sb, " -");
  166         }
  167         PROC_UNLOCK(p);
  168         sbuf_printf(sb, "\n");
  169 
  170         return (0);
  171 }
  172 
  173 int
  174 procfs_doproccmdline(PFS_FILL_ARGS)
  175 {
  176 
  177         /*
  178          * If we are using the ps/cmdline caching, use that.  Otherwise
  179          * read argv from the process space.
  180          * Note that if the argv is no longer available, we deliberately
  181          * don't fall back on p->p_comm or return an error: the authentic
  182          * Linux behaviour is to return zero-length in this case.
  183          */
  184 
  185         PROC_LOCK(p);
  186         if (p->p_args && p_cansee(td, p) == 0) {
  187                 sbuf_bcpy(sb, p->p_args->ar_args, p->p_args->ar_length);
  188                 PROC_UNLOCK(p);
  189                 return (0);
  190         }
  191 
  192         if ((p->p_flag & P_SYSTEM) != 0) {
  193                 PROC_UNLOCK(p);
  194                 return (0);
  195         }
  196 
  197         PROC_UNLOCK(p);
  198 
  199         return (proc_getargv(td, p, sb));
  200 }

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FreeBSD/Linux Kernel Cross Reference sys/fs/procfs/procfs_status.c

FreeBSD/Linux Kernel Cross Reference
sys/fs/procfs/procfs_status.c