sys/vfs/procfs/procfs_rlimit.c

   1 /*
   2  * Copyright (c) 1999 Adrian Chadd
   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  * 3. 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  * $FreeBSD: src/sys/miscfs/procfs/procfs_rlimit.c,v 1.5 1999/12/08 08:59:37 phk Exp $
  36  * $DragonFly: src/sys/vfs/procfs/procfs_rlimit.c,v 1.7 2007/02/19 01:14:24 corecode Exp $
  37  */
  38
  39 /*
  40  * To get resource.h to include our rlimit_ident[] array of rlimit identifiers
  41  */
  42
  43 #define _RLIMIT_IDENT
  44
  45 #include <sys/param.h>
  46 #include <sys/systm.h>
  47 #include <sys/proc.h>
  48 #include <sys/vnode.h>
  49 #include <sys/resourcevar.h>
  50 #include <sys/resource.h>
  51 #include <sys/types.h>
  52 #include <vfs/procfs/procfs.h>
  53
  54
  55 int
  56 procfs_dorlimit(struct proc *curp, struct lwp *lp, struct pfsnode *pfs,
  57                 struct uio *uio)
  58 {
  59         struct proc *p = lp->lwp_proc;
  60         size_t xlen;
  61         char *ps;
  62         int error;
  63         int i;
  64         char psbuf[512];                /* XXX - conservative */
  65
  66         if (uio->uio_rw != UIO_READ)
  67                 return (EOPNOTSUPP);
  68
  69         ps = psbuf;
  70
  71         for (i = 0; i < RLIM_NLIMITS; i++) {
  72
  73                 /*
  74                  * Add the rlimit ident
  75                  */
  76
  77                 ps += ksprintf(ps, "%s ", rlimit_ident[i]);
  78
  79                 /*
  80                  * Replace RLIM_INFINITY with -1 in the string
  81                  */
  82
  83                 /*
  84                  * current limit
  85                  */
  86
  87                 if (p->p_rlimit[i].rlim_cur == RLIM_INFINITY) {
  88                         ps += ksprintf(ps, "-1 ");
  89                 } else {
  90                         ps += ksprintf(ps, "%llu ",
  91                                 (unsigned long long)p->p_rlimit[i].rlim_cur);
  92                 }
  93
  94                 /*
  95                  * maximum limit
  96                  */
  97
  98                 if (p->p_rlimit[i].rlim_max == RLIM_INFINITY) {
  99                         ps += ksprintf(ps, "-1\n");
 100                 } else {
 101                         ps += ksprintf(ps, "%llu\n",
 102                                 (unsigned long long)p->p_rlimit[i].rlim_max);
 103                 }
 104         }
 105
 106         xlen = ps - psbuf;
 107         error = uiomove_frombuf(psbuf, xlen, uio);
 108
 109         return (error);
 110 }
 111