procfs_status.c

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

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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