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ulimit -c for core dumps
From: |
Jason Roscoe |
Subject: |
ulimit -c for core dumps |
Date: |
Thu, 19 Oct 2006 14:56:29 -0400 |
User-agent: |
Thunderbird 1.5 (X11/20051201) |
Hi,
I'm trying to limit the size of coredumps using 'ulimit -c'. Can
someone please explain why a core file gets generated from the coretest
program (source is below)?
Thanks for any help or suggestions.
Shell interaction
% ulimit -H -c
unlimited
% ulimit -S -c
0
% bash --version
GNU bash, version 2.05b.0(1)-release (i386-pc-linux-gnu)
Copyright (C) 2002 Free Software Foundation, Inc.
% ulimit -c 512
% ulimit -S -c
512
% ulimit -H -c
512
% ./coretest 2048
rlim_cur,rlim_max = 524288,524288
malloced 2097152 bytes my pid is 21255
Segmentation fault (core dumped)
% ls -l core
-rw------- 1 jacr swdvt 2265088 2006-10-19 14:24 core
%
#include <stdio.h>
#include <stdlib.h>
#include <signal.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <unistd.h>
int main(int argc, char* argv[])
{
char* c;
int mult=1024;
int sz;
struct rlimit rlim;
if(getrlimit(RLIMIT_CORE,&rlim))
printf("error getting rlimit\n");
printf("rlim_cur,rlim_max = %u,%u\n",rlim.rlim_cur,rlim.rlim_max);
if(argc>1)
mult=atoi(argv[1]);
sz=mult*1024;
c=malloc(sz);
if(!c)
{
printf("unable to malloc\n");
exit(EXIT_FAILURE);
}
printf("malloced %u bytes my pid is %u\n",sz,getpid());
raise(SIGSEGV);
return EXIT_SUCCESS;
}
- ulimit -c for core dumps,
Jason Roscoe <=