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/*
reslimit.c - resource limit functions
Copyright (C) 2002, 2003 Arthur de Jong.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "config.h"
#include <unistd.h>
#include <string.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <errno.h>
#include "reslimit.h"
#include "xmalloc.h"
#include "log.h"
/* workaround for old BSD systems */
#ifndef RLIMIT_NOFILE
#define RLIMIT_NOFILE RLIMIT_OFILE
#endif
/* definition of all settable resources */
static struct resource {
int resource; /* the id of the resource for setrlimit() */
char *name; /* symbolic name of resource, see below */
int type; /* the type of the resource, see reslimit.h defines */
} knownresources[]= {
{ RLIMIT_CORE, "coredumpsize", RESTYPE_SIZE },
{ RLIMIT_CORE, "core", RESTYPE_SIZE },
{ RLIMIT_CPU, "cputime", RESTYPE_TIME },
{ RLIMIT_CPU, "cpu", RESTYPE_TIME },
{ RLIMIT_DATA, "datasize", RESTYPE_SIZE },
{ RLIMIT_DATA, "data", RESTYPE_SIZE },
{ RLIMIT_FSIZE, "filesize", RESTYPE_SIZE },
{ RLIMIT_FSIZE, "fsize", RESTYPE_SIZE },
#ifdef RLIMIT_MEMLOCK
{ RLIMIT_MEMLOCK, "memorylocked", RESTYPE_SIZE },
{ RLIMIT_MEMLOCK, "memlock", RESTYPE_SIZE },
#endif /* RLIMIT_MEMLOCK */
{ RLIMIT_NOFILE, "openfiles", RESTYPE_NUM },
{ RLIMIT_NOFILE, "nofile", RESTYPE_NUM },
#ifdef RLIMIT_NPROC
{ RLIMIT_NPROC, "maxproc", RESTYPE_NUM },
{ RLIMIT_NPROC, "nproc", RESTYPE_NUM },
#endif /* RLIMIT_NPROC */
#ifdef RLIMIT_RSS
{ RLIMIT_RSS, "memoryuse", RESTYPE_SIZE },
{ RLIMIT_RSS, "rss", RESTYPE_SIZE },
#endif /* RLIMIT_RSS */
{ RLIMIT_STACK, "stacksize", RESTYPE_SIZE },
{ RLIMIT_STACK, "stack", RESTYPE_SIZE },
#ifdef RLIMIT_AS
{ RLIMIT_AS, "virtmem", RESTYPE_SIZE },
{ RLIMIT_AS, "as", RESTYPE_SIZE },
#endif /* RLIMIT_AS */
#ifdef RLIMIT_VMEM
{ RLIMIT_VMEM, "virtmem", RESTYPE_SIZE },
#endif /* RLIMIT_VMEM */
#ifdef RLIMIT_PTHREAD
{ RLIMIT_PTHREAD, "pthreads", RESTYPE_NUM },
#endif /* RLIMIT_PTHREAD */
{ -1, NULL, -1 }
};
/* the list of resource limitations configured */
static struct reslimit
{
struct resource *resource;
struct rlimit limit;
struct reslimit *next;
} *savedlimits=NULL;
/* find the resource record for the given name */
static struct resource *getresourcebyname(const char *name)
{
struct resource *tmp;
for (tmp=knownresources;tmp->name!=NULL;tmp++)
{
if (strcmp(name,tmp->name)==0)
{
return tmp;
}
}
return NULL;
}
/* return the type of the resource defined by name */
int getresourcetype(const char *name)
{
struct resource *res;
res=getresourcebyname(name);
if (res==NULL)
return RESTYPE_UNKNOWN;
return res->type;
}
/* save the limit to the specified values
note: limit will be set only when setreslimits() is called */
void savereslimit(const char *name,rlim_t soft,rlim_t hard)
{
struct resource *res;
struct reslimit *lim;
res=getresourcebyname(name);
if (res==NULL)
{
log_log(LOG_ERR,"cannot find resource %s",name);
exit(1);
}
lim=(struct reslimit *)xmalloc(sizeof(struct reslimit));
lim->resource=res;
lim->limit.rlim_cur=soft;
lim->limit.rlim_max=hard;
lim->next=savedlimits;
savedlimits=lim;
}
/* set all the resources defined */
void setreslimits(void)
{
struct reslimit *tmp;
for (tmp=savedlimits;tmp!=NULL;tmp=tmp->next)
{
log_log(LOG_DEBUG,"debug: limit %s to %d(soft) and %d(hard)",
tmp->resource->name,
(int)(tmp->limit.rlim_cur),
(int)(tmp->limit.rlim_max));
if (setrlimit(tmp->resource->resource,&(tmp->limit)))
{
log_log(LOG_ERR,"cannot limit %s: %s",tmp->resource->name,strerror(errno));
exit(1);
}
}
}
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