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         int pid, ppid, pgid, sid;
   74         int i;
   75 
   76         pid = p->p_pid;
   77         PROC_LOCK(p);
   78         ppid = p->p_pptr ? p->p_pptr->p_pid : 0;
   79         pgid = p->p_pgrp->pg_id;
   80         sess = p->p_pgrp->pg_session;
   81         SESS_LOCK(sess);
   82         sid = sess->s_leader ? sess->s_leader->p_pid : 0;
   83 
   84 /* comm pid ppid pgid sid tty ctty,sldr start ut st wmsg
   85                                 euid ruid rgid,egid,groups[1 .. NGROUPS]
   86 */
   87 
   88         pc = p->p_comm;
   89         do {
   90                 if (*pc < 33 || *pc > 126 || *pc == '\\')
   91                         sbuf_printf(sb, "\\%03o", *pc);
   92                 else
   93                         sbuf_putc(sb, *pc);
   94         } while (*++pc);
   95         sbuf_printf(sb, " %d %d %d %d ", pid, ppid, pgid, sid);
   96         if ((p->p_flag & P_CONTROLT) && (tp = sess->s_ttyp))
   97                 sbuf_printf(sb, "%s ", devtoname(tp->t_dev));
   98         else
   99                 sbuf_printf(sb, "- ");
  100 
  101         sep = "";
  102         if (sess->s_ttyvp) {
  103                 sbuf_printf(sb, "%sctty", sep);
  104                 sep = ",";
  105         }
  106         if (SESS_LEADER(p)) {
  107                 sbuf_printf(sb, "%ssldr", sep);
  108                 sep = ",";
  109         }
  110         SESS_UNLOCK(sess);
  111         if (*sep != ',') {
  112                 sbuf_printf(sb, "noflags");
  113         }
  114 
  115 #ifdef KSE
  116         if (p->p_flag & P_SA)
  117                 wmesg = "-kse- ";
  118         else
  119 #endif
  120         {
  121                 tdfirst = FIRST_THREAD_IN_PROC(p);
  122                 if (tdfirst->td_wchan != NULL) {
  123                         KASSERT(tdfirst->td_wmesg != NULL,
  124                             ("wchan %p has no wmesg", tdfirst->td_wchan));
  125                         wmesg = tdfirst->td_wmesg;
  126                 } else
  127                         wmesg = "nochan";
  128         }
  129 
  130         if (p->p_flag & P_INMEM) {
  131                 struct timeval start, ut, st;
  132 
  133                 PROC_SLOCK(p);
  134                 calcru(p, &ut, &st);
  135                 PROC_SUNLOCK(p);
  136                 start = p->p_stats->p_start;
  137                 timevaladd(&start, &boottime);
  138                 sbuf_printf(sb, " %jd,%ld %jd,%ld %jd,%ld",
  139                     (intmax_t)start.tv_sec, start.tv_usec,
  140                     (intmax_t)ut.tv_sec, ut.tv_usec,
  141                     (intmax_t)st.tv_sec, st.tv_usec);
  142         } else
  143                 sbuf_printf(sb, " -1,-1 -1,-1 -1,-1");
  144 
  145         sbuf_printf(sb, " %s", wmesg);
  146 
  147         cr = p->p_ucred;
  148 
  149         sbuf_printf(sb, " %lu %lu %lu",
  150                 (u_long)cr->cr_uid,
  151                 (u_long)cr->cr_ruid,
  152                 (u_long)cr->cr_rgid);
  153 
  154         /* egid (cr->cr_svgid) is equal to cr_ngroups[0]
  155            see also getegid(2) in /sys/kern/kern_prot.c */
  156 
  157         for (i = 0; i < cr->cr_ngroups; i++) {
  158                 sbuf_printf(sb, ",%lu", (u_long)cr->cr_groups[i]);
  159         }
  160 
  161         if (jailed(p->p_ucred)) {
  162                 mtx_lock(&p->p_ucred->cr_prison->pr_mtx);
  163                 sbuf_printf(sb, " %s", p->p_ucred->cr_prison->pr_host);
  164                 mtx_unlock(&p->p_ucred->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         struct ps_strings pstr;
  178         char **ps_argvstr;
  179         int error, i;
  180 
  181         /*
  182          * If we are using the ps/cmdline caching, use that.  Otherwise
  183          * revert back to the old way which only implements full cmdline
  184          * for the currept process and just p->p_comm for all other
  185          * processes.
  186          * Note that if the argv is no longer available, we deliberately
  187          * don't fall back on p->p_comm or return an error: the authentic
  188          * Linux behaviour is to return zero-length in this case.
  189          */
  190 
  191         PROC_LOCK(p);
  192         if (p->p_args && p_cansee(td, p) == 0) {
  193                 sbuf_bcpy(sb, p->p_args->ar_args, p->p_args->ar_length);
  194                 PROC_UNLOCK(p);
  195                 return (0);
  196         }
  197         PROC_UNLOCK(p);
  198         if (p != td->td_proc) {
  199                 sbuf_printf(sb, "%.*s", MAXCOMLEN, p->p_comm);
  200         } else {
  201                 error = copyin((void *)p->p_sysent->sv_psstrings, &pstr,
  202                     sizeof(pstr));
  203                 if (error)
  204                         return (error);
  205                 if (pstr.ps_nargvstr > ARG_MAX)
  206                         return (E2BIG);
  207                 ps_argvstr = malloc(pstr.ps_nargvstr * sizeof(char *),
  208                     M_TEMP, M_WAITOK);
  209                 error = copyin((void *)pstr.ps_argvstr, ps_argvstr,
  210                     pstr.ps_nargvstr * sizeof(char *));
  211                 if (error) {
  212                         free(ps_argvstr, M_TEMP);
  213                         return (error);
  214                 }
  215                 for (i = 0; i < pstr.ps_nargvstr; i++) {
  216                         sbuf_copyin(sb, ps_argvstr[i], 0);
  217                         sbuf_printf(sb, "%c", '\0');
  218                 }
  219                 free(ps_argvstr, M_TEMP);
  220         }
  221 
  222         return (0);
  223 }

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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