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Add a new "file" to procfs: "rlimit" which shows the resource limits for

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the process.

PR:		11342
Submitted by:	Adrian Chadd adrian@freebsd.org
Reviewed by:	phk
This commit is contained in:
Poul-Henning Kamp 1999-04-30 13:04:21 +00:00
parent d35f30aa80
commit d37ed5a03a
11 changed files with 408 additions and 10 deletions
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12
share/man/man5/procfs.5
View File

@ -1,4 +1,4 @@
.\" $Id: procfs.5,v 1.9 1998/03/12 07:30:48 charnier Exp $
.\" $Id: procfs.5,v 1.10 1998/06/28 21:33:42 hoek Exp $
.\" Written by Garrett Wollman
.\" This file is in the public domain.
.\"
@ -109,6 +109,12 @@ defined in
.Pa <machine/reg.h> .
.Pa regs
can only be written when the process is stopped.
.It Pa rlimit
This is a read-only file containing the process current and maximum
limits. Each line is of the format
.Ar rlimit current max
, with -1
indicating infinity.
.It Pa status
The process status.
This file is read-only and returns a single line containing
@ -192,6 +198,8 @@ directory containing process information for process
.Pa pid .
.It Pa /proc/curproc
directory containing process information for the current process
.It Pa /proc/curproc/cmdline
the process executable name
.It Pa /proc/curproc/ctl
used to send control messages to the process
.It Pa /proc/curproc/etype
@ -210,6 +218,8 @@ used for signaling the process
used for signaling the process group
.It Pa /proc/curproc/regs
the process register set
.It Pa /proc/curproc/rlimit
the process current and maximum rlimit
.It Pa /proc/curproc/status
the process' current status
.El

1
sys/conf/files
View File

@ -370,6 +370,7 @@ miscfs/procfs/procfs_subr.c optional procfs
miscfs/procfs/procfs_type.c optional procfs
miscfs/procfs/procfs_vfsops.c optional procfs
miscfs/procfs/procfs_vnops.c optional procfs
miscfs/procfs/procfs_rlimit.c optional procfs
miscfs/specfs/spec_vnops.c standard
miscfs/umapfs/umap_subr.c optional umapfs
miscfs/umapfs/umap_vfsops.c optional umapfs

6
sys/fs/procfs/procfs.h
View File

@ -37,7 +37,7 @@
* @(#)procfs.h 8.9 (Berkeley) 5/14/95
*
* From:
* $Id: procfs.h,v 1.22 1999/04/27 11:16:35 phk Exp $
* $Id: procfs.h,v 1.23 1999/04/28 11:37:18 phk Exp $
*/
/*
@ -57,7 +57,8 @@ typedef enum {
Pnotepg, /* process group notifier */
Pmap, /* memory map */
Ptype, /* executable type */
Pcmdline /* command line */
Pcmdline, /* command line */
Prlimit /* resource limits */
} pfstype;
/*
@ -156,6 +157,7 @@ int procfs_dostatus __P((struct proc *, struct proc *, struct pfsnode *pfsp, str
int procfs_domap __P((struct proc *, struct proc *, struct pfsnode *pfsp, struct uio *uio));
int procfs_dotype __P((struct proc *, struct proc *, struct pfsnode *pfsp, struct uio *uio));
int procfs_docmdline __P((struct proc *, struct proc *, struct pfsnode *pfsp, struct uio *uio));
int procfs_dorlimit __P((struct proc *, struct proc *, struct pfsnode *pfsp, struct uio *uio));
/* Return 1 if process has special kernel digging privileges */
int procfs_kmemaccess __P((struct proc *));

175
sys/fs/procfs/procfs_rlimit.c Normal file
View File

@ -0,0 +1,175 @@
/*
* Copyright (c) 1999 Adrian Chadd
* Copyright (c) 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Jan-Simon Pendry.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)procfs_status.c 8.4 (Berkeley) 6/15/94
*
* $Id: procfs_status.c,v 1.12 1999/01/05 03:53:06 peter Exp $
*/
/*
* To get resource.h to include our rlimit_ident[] array of rlimit identifiers
*/
#define _RLIMIT_IDENT
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/vnode.h>
#include <sys/tty.h>
#include <sys/resourcevar.h>
#include <sys/resource.h>
#include <sys/types.h>
#include <miscfs/procfs/procfs.h>
/*
* This converts a quad_t to a string, stored in fin
* It is here because there doesn't exist a quad_t entry in the kernel
* printf() library.
*/
static void quadtostring (char *fin, quad_t num)
{
char str[128];
char *cp;
int i, n;
cp = str;
i = 0;
/*
* Create the number string.
* The string will be in reverse from the original number.
*/
while (num) {
*(cp++) = (num % 10) + '0';
num /= 10;
i++;
}
/* Null terminate */
*cp = '\0';
/*
* Now, swap the order
*/
for (n = 0; n < i; n++) {
fin[n] = str[(i-1)-n];
}
/* Null terminate */
fin[n] = '\0';
return;
}
int
procfs_dorlimit(curp, p, pfs, uio)
struct proc *curp;
struct proc *p;
struct pfsnode *pfs;
struct uio *uio;
{
char *ps;
int i;
int xlen;
int error;
char psbuf[512]; /* XXX - conservative */
char qstr[64];
if (uio->uio_rw != UIO_READ)
return (EOPNOTSUPP);
ps = psbuf;
for (i = 0; i < RLIM_NLIMITS; i++) {
/*
* Add the rlimit ident
*/
ps += sprintf(ps, "%s ", rlimit_ident[i]);
/*
* Replace RLIM_INFINITY with -1 in the string
*/
/*
* current limit
*/
if (p->p_rlimit[i].rlim_cur == RLIM_INFINITY) {
ps += sprintf(ps, "-1 ");
} else {
quadtostring(qstr, p->p_rlimit[i].rlim_cur);
ps += sprintf(ps, "%s ", qstr);
}
/*
* maximum limit
*/
if (p->p_rlimit[i].rlim_max == RLIM_INFINITY) {
ps += sprintf(ps, "-1\n");
} else {
quadtostring(qstr, p->p_rlimit[i].rlim_max);
ps += sprintf(ps, "%s\n", qstr);
}
}
/*
* This logic is rather tasty - but its from procfs_status.c, so
* I guess I'll use it here.
*/
xlen = ps - psbuf;
xlen -= uio->uio_offset;
ps = psbuf + uio->uio_offset;
xlen = imin(xlen, uio->uio_resid);
if (xlen <= 0)
error = 0;
else
error = uiomove(ps, xlen, uio);
return (error);
}

7
sys/fs/procfs/procfs_subr.c
View File

@ -36,7 +36,7 @@
*
* @(#)procfs_subr.c 8.6 (Berkeley) 5/14/95
*
* $Id: procfs_subr.c,v 1.22 1999/01/05 03:53:06 peter Exp $
* $Id: procfs_subr.c,v 1.23 1999/01/27 22:42:07 dillon Exp $
*/
#include <sys/param.h>
@ -182,6 +182,7 @@ procfs_allocvp(mp, vpp, pid, pfs_type)
case Pmap:
case Pstatus:
case Pcmdline:
case Prlimit:
pfs->pfs_mode = (VREAD) |
(VREAD >> 3) |
(VREAD >> 6);
@ -287,6 +288,10 @@ procfs_rw(ap)
rtval = procfs_docmdline(curp, p, pfs, uio);
break;
case Prlimit:
rtval = procfs_dorlimit(curp, p, pfs, uio);
break;
default:
rtval = EOPNOTSUPP;
break;

4
sys/fs/procfs/procfs_vnops.c
View File

@ -36,7 +36,7 @@
*
* @(#)procfs_vnops.c 8.18 (Berkeley) 5/21/95
*
* $Id: procfs_vnops.c,v 1.65 1999/04/27 11:16:39 phk Exp $
* $Id: procfs_vnops.c,v 1.66 1999/04/28 11:37:21 phk Exp $
*/
/*
@ -102,6 +102,7 @@ static struct proc_target {
{ DT_REG, N("map"), Pmap, procfs_validmap },
{ DT_REG, N("etype"), Ptype, procfs_validtype },
{ DT_REG, N("cmdline"), Pcmdline, NULL },
{ DT_REG, N("rlimit"), Prlimit, NULL },
#undef N
};
static const int nproc_targets = sizeof(proc_targets) / sizeof(proc_targets[0]);
@ -577,6 +578,7 @@ procfs_getattr(ap)
case Pnote:
case Pnotepg:
case Pcmdline:
case Prlimit:
vap->va_nlink = 1;
vap->va_uid = procp->p_ucred->cr_uid;
vap->va_gid = procp->p_ucred->cr_gid;

6
sys/miscfs/procfs/procfs.h
View File

@ -37,7 +37,7 @@
* @(#)procfs.h 8.9 (Berkeley) 5/14/95
*
* From:
* $Id: procfs.h,v 1.22 1999/04/27 11:16:35 phk Exp $
* $Id: procfs.h,v 1.23 1999/04/28 11:37:18 phk Exp $
*/
/*
@ -57,7 +57,8 @@ typedef enum {
Pnotepg, /* process group notifier */
Pmap, /* memory map */
Ptype, /* executable type */
Pcmdline /* command line */
Pcmdline, /* command line */
Prlimit /* resource limits */
} pfstype;
/*
@ -156,6 +157,7 @@ int procfs_dostatus __P((struct proc *, struct proc *, struct pfsnode *pfsp, str
int procfs_domap __P((struct proc *, struct proc *, struct pfsnode *pfsp, struct uio *uio));
int procfs_dotype __P((struct proc *, struct proc *, struct pfsnode *pfsp, struct uio *uio));
int procfs_docmdline __P((struct proc *, struct proc *, struct pfsnode *pfsp, struct uio *uio));
int procfs_dorlimit __P((struct proc *, struct proc *, struct pfsnode *pfsp, struct uio *uio));
/* Return 1 if process has special kernel digging privileges */
int procfs_kmemaccess __P((struct proc *));

175
sys/miscfs/procfs/procfs_rlimit.c Normal file
View File

@ -0,0 +1,175 @@
/*
* Copyright (c) 1999 Adrian Chadd
* Copyright (c) 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Jan-Simon Pendry.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)procfs_status.c 8.4 (Berkeley) 6/15/94
*
* $Id: procfs_status.c,v 1.12 1999/01/05 03:53:06 peter Exp $
*/
/*
* To get resource.h to include our rlimit_ident[] array of rlimit identifiers
*/
#define _RLIMIT_IDENT
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/vnode.h>
#include <sys/tty.h>
#include <sys/resourcevar.h>
#include <sys/resource.h>
#include <sys/types.h>
#include <miscfs/procfs/procfs.h>
/*
* This converts a quad_t to a string, stored in fin
* It is here because there doesn't exist a quad_t entry in the kernel
* printf() library.
*/
static void quadtostring (char *fin, quad_t num)
{
char str[128];
char *cp;
int i, n;
cp = str;
i = 0;
/*
* Create the number string.
* The string will be in reverse from the original number.
*/
while (num) {
*(cp++) = (num % 10) + '0';
num /= 10;
i++;
}
/* Null terminate */
*cp = '\0';
/*
* Now, swap the order
*/
for (n = 0; n < i; n++) {
fin[n] = str[(i-1)-n];
}
/* Null terminate */
fin[n] = '\0';
return;
}
int
procfs_dorlimit(curp, p, pfs, uio)
struct proc *curp;
struct proc *p;
struct pfsnode *pfs;
struct uio *uio;
{
char *ps;
int i;
int xlen;
int error;
char psbuf[512]; /* XXX - conservative */
char qstr[64];
if (uio->uio_rw != UIO_READ)
return (EOPNOTSUPP);
ps = psbuf;
for (i = 0; i < RLIM_NLIMITS; i++) {
/*
* Add the rlimit ident
*/
ps += sprintf(ps, "%s ", rlimit_ident[i]);
/*
* Replace RLIM_INFINITY with -1 in the string
*/
/*
* current limit
*/
if (p->p_rlimit[i].rlim_cur == RLIM_INFINITY) {
ps += sprintf(ps, "-1 ");
} else {
quadtostring(qstr, p->p_rlimit[i].rlim_cur);
ps += sprintf(ps, "%s ", qstr);
}
/*
* maximum limit
*/
if (p->p_rlimit[i].rlim_max == RLIM_INFINITY) {
ps += sprintf(ps, "-1\n");
} else {
quadtostring(qstr, p->p_rlimit[i].rlim_max);
ps += sprintf(ps, "%s\n", qstr);
}
}
/*
* This logic is rather tasty - but its from procfs_status.c, so
* I guess I'll use it here.
*/
xlen = ps - psbuf;
xlen -= uio->uio_offset;
ps = psbuf + uio->uio_offset;
xlen = imin(xlen, uio->uio_resid);
if (xlen <= 0)
error = 0;
else
error = uiomove(ps, xlen, uio);
return (error);
}

7
sys/miscfs/procfs/procfs_subr.c
View File

@ -36,7 +36,7 @@
*
* @(#)procfs_subr.c 8.6 (Berkeley) 5/14/95
*
* $Id: procfs_subr.c,v 1.22 1999/01/05 03:53:06 peter Exp $
* $Id: procfs_subr.c,v 1.23 1999/01/27 22:42:07 dillon Exp $
*/
#include <sys/param.h>
@ -182,6 +182,7 @@ procfs_allocvp(mp, vpp, pid, pfs_type)
case Pmap:
case Pstatus:
case Pcmdline:
case Prlimit:
pfs->pfs_mode = (VREAD) |
(VREAD >> 3) |
(VREAD >> 6);
@ -287,6 +288,10 @@ procfs_rw(ap)
rtval = procfs_docmdline(curp, p, pfs, uio);
break;
case Prlimit:
rtval = procfs_dorlimit(curp, p, pfs, uio);
break;
default:
rtval = EOPNOTSUPP;
break;

4
sys/miscfs/procfs/procfs_vnops.c
View File

@ -36,7 +36,7 @@
*
* @(#)procfs_vnops.c 8.18 (Berkeley) 5/21/95
*
* $Id: procfs_vnops.c,v 1.65 1999/04/27 11:16:39 phk Exp $
* $Id: procfs_vnops.c,v 1.66 1999/04/28 11:37:21 phk Exp $
*/
/*
@ -102,6 +102,7 @@ static struct proc_target {
{ DT_REG, N("map"), Pmap, procfs_validmap },
{ DT_REG, N("etype"), Ptype, procfs_validtype },
{ DT_REG, N("cmdline"), Pcmdline, NULL },
{ DT_REG, N("rlimit"), Prlimit, NULL },
#undef N
};
static const int nproc_targets = sizeof(proc_targets) / sizeof(proc_targets[0]);
@ -577,6 +578,7 @@ procfs_getattr(ap)
case Pnote:
case Pnotepg:
case Pcmdline:
case Prlimit:
vap->va_nlink = 1;
vap->va_uid = procp->p_ucred->cr_uid;
vap->va_gid = procp->p_ucred->cr_gid;

21
sys/sys/resource.h
View File

@ -31,7 +31,7 @@
* SUCH DAMAGE.
*
* @(#)resource.h 8.4 (Berkeley) 1/9/95
* $Id: resource.h,v 1.7 1997/02/22 09:45:46 peter Exp $
* $Id: resource.h,v 1.8 1997/11/18 08:07:37 bde Exp $
*/
#ifndef _SYS_RESOURCE_H_
@ -92,6 +92,25 @@ struct rusage {
#define RLIM_INFINITY ((rlim_t)(((u_quad_t)1 << 63) - 1))
/*
* Resource limit string identifiers
*/
#ifdef _RLIMIT_IDENT
static char *rlimit_ident[] = {
"cpu",
"fsize",
"data",
"stack",
"core",
"rss",
"memlock",
"nproc",
"nofile",
};
#endif
struct orlimit {
int32_t rlim_cur; /* current (soft) limit */
int32_t rlim_max; /* maximum value for rlim_cur */