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/sysent.h>
   56 #include <sys/tty.h>
   57 
   58 #include <vm/vm.h>
   59 #include <vm/pmap.h>
   60 #include <vm/vm_param.h>
   61 
   62 #include <fs/pseudofs/pseudofs.h>
   63 #include <fs/procfs/procfs.h>
   64 
   65 int
   66 procfs_doprocstatus(PFS_FILL_ARGS)
   67 {
   68         struct session *sess;
   69         struct thread *tdfirst;
   70         struct tty *tp;
   71         struct ucred *cr;
   72         const char *wmesg;
   73         char *pc;
   74         char *sep;
   75         struct timeval boottime;
   76         int pid, ppid, pgid, sid;
   77         int i;
   78 
   79         pid = p->p_pid;
   80         PROC_LOCK(p);
   81         ppid = p->p_pptr ? p->p_pptr->p_pid : 0;
   82         pgid = p->p_pgrp->pg_id;
   83         sess = p->p_pgrp->pg_session;
   84         SESS_LOCK(sess);
   85         sid = sess->s_leader ? sess->s_leader->p_pid : 0;
   86 
   87 /* comm pid ppid pgid sid tty ctty,sldr start ut st wmsg
   88                                 euid ruid rgid,egid,groups[1 .. ngroups]
   89 */
   90 
   91         pc = p->p_comm;
   92         do {
   93                 if (*pc < 33 || *pc > 126 || *pc == '\\')
   94                         sbuf_printf(sb, "\\%03o", *pc);
   95                 else
   96                         sbuf_putc(sb, *pc);
   97         } while (*++pc);
   98         sbuf_printf(sb, " %d %d %d %d ", pid, ppid, pgid, sid);
   99         if ((p->p_flag & P_CONTROLT) && (tp = sess->s_ttyp))
  100                 sbuf_printf(sb, "%s ", devtoname(tp->t_dev));
  101         else
  102                 sbuf_printf(sb, "- ");
  103 
  104         sep = "";
  105         if (sess->s_ttyvp) {
  106                 sbuf_printf(sb, "%sctty", sep);
  107                 sep = ",";
  108         }
  109         if (SESS_LEADER(p)) {
  110                 sbuf_printf(sb, "%ssldr", sep);
  111                 sep = ",";
  112         }
  113         SESS_UNLOCK(sess);
  114         if (*sep != ',') {
  115                 sbuf_printf(sb, "noflags");
  116         }
  117 
  118         tdfirst = FIRST_THREAD_IN_PROC(p);
  119         thread_lock(tdfirst);
  120         if (tdfirst->td_wchan != NULL) {
  121                 KASSERT(tdfirst->td_wmesg != NULL,
  122                     ("wchan %p has no wmesg", tdfirst->td_wchan));
  123                 wmesg = tdfirst->td_wmesg;
  124         } else
  125                 wmesg = "nochan";
  126         thread_unlock(tdfirst);
  127 
  128         if (p->p_flag & P_INMEM) {
  129                 struct timeval start, ut, st;
  130 
  131                 PROC_STATLOCK(p);
  132                 calcru(p, &ut, &st);
  133                 PROC_STATUNLOCK(p);
  134                 start = p->p_stats->p_start;
  135                 getboottime(&boottime);
  136                 timevaladd(&start, &boottime);
  137                 sbuf_printf(sb, " %jd,%ld %jd,%ld %jd,%ld",
  138                     (intmax_t)start.tv_sec, start.tv_usec,
  139                     (intmax_t)ut.tv_sec, ut.tv_usec,
  140                     (intmax_t)st.tv_sec, st.tv_usec);
  141         } else
  142                 sbuf_printf(sb, " -1,-1 -1,-1 -1,-1");
  143 
  144         sbuf_printf(sb, " %s", wmesg);
  145 
  146         cr = p->p_ucred;
  147 
  148         sbuf_printf(sb, " %lu %lu %lu",
  149                 (u_long)cr->cr_uid,
  150                 (u_long)cr->cr_ruid,
  151                 (u_long)cr->cr_rgid);
  152 
  153         /* egid (cr->cr_svgid) is equal to cr_ngroups[0]
  154            see also getegid(2) in /sys/kern/kern_prot.c */
  155 
  156         for (i = 0; i < cr->cr_ngroups; i++) {
  157                 sbuf_printf(sb, ",%lu", (u_long)cr->cr_groups[i]);
  158         }
  159 
  160         if (jailed(cr)) {
  161                 mtx_lock(&cr->cr_prison->pr_mtx);
  162                 sbuf_printf(sb, " %s",
  163                     prison_name(td->td_ucred->cr_prison, cr->cr_prison));
  164                 mtx_unlock(&cr->cr_prison->pr_mtx);
  165         } else {
  166                 sbuf_printf(sb, " -");
  167         }
  168         PROC_UNLOCK(p);
  169         sbuf_printf(sb, "\n");
  170 
  171         return (0);
  172 }
  173 
  174 int
  175 procfs_doproccmdline(PFS_FILL_ARGS)
  176 {
  177 
  178         /*
  179          * If we are using the ps/cmdline caching, use that.  Otherwise
  180          * read argv from the process space.
  181          * Note that if the argv is no longer available, we deliberately
  182          * don't fall back on p->p_comm or return an error: the authentic
  183          * Linux behaviour is to return zero-length in this case.
  184          */
  185 
  186         PROC_LOCK(p);
  187         if (p->p_args && p_cansee(td, p) == 0) {
  188                 sbuf_bcpy(sb, p->p_args->ar_args, p->p_args->ar_length);
  189                 PROC_UNLOCK(p);
  190                 return (0);
  191         }
  192 
  193         if ((p->p_flag & P_SYSTEM) != 0) {
  194                 PROC_UNLOCK(p);
  195                 return (0);
  196         }
  197 
  198         PROC_UNLOCK(p);
  199 
  200         return (proc_getargv(td, p, sb));
  201 }

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

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sys/fs/procfs/procfs_status.c