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$ uname -a
Linux dev 2.4.21-9.30AXsmp #1 SMP Wed May 26 23:37:09 EDT 2004 i686 i686 i386 GNU/Linux
ÔÙ¿´¿´Ä¬ÈϵÄһЩ²ÎÊý£¬×¢Òâcore file sizeÊǸö0£¬³ÌÐò³ö´íʱ²»»á²úÉúcoreÎļþÁË¡£
$ ulimit -a
core file size (blocks, -c) 0
data seg size (kbytes, -d) unlimited
file size (blocks, -f) unlimited
max locked memory (kbytes, -l) 4
max memory size (kbytes, -m) unlimited
open files (-n) 2048
pipe size (512 bytes, -p) 8
stack size (kbytes, -s) 10240
cpu time (seconds, -t) unlimited
max user processes (-u) 7168
virtual memory (kbytes, -v) unlimited
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$ more foo.c
#include <stdio.h>
static void sub(void);
int main(void)
{
    sub();
    return 0;
}
static void sub(void)
{
    int *p = NULL;
    /* derefernce a null pointer, expect core dump. */
    printf("%d", *p);
}
$ gcc -Wall -g foo.c
$ ./a.out
Segmentation fault
$ ls -l core.*
ls: core.*: No such file or directory
ûÓÐÕÒµ½coreÎļþ£¬ÎÒÃǸĸÄulimitµÄÉèÖã¬ÈÃËü²úÉú¡£1024ÊÇËæ±ãÈ¡µÄ£¬ÒªÊÇcoreÎļþ´óÓÚ1024¸ö¿é£¬¾Í²úÉú²»³öÀ´ÁË¡£
$ ulimit -c 1024
$ ulimit -a
core file size (blocks, -c) 1024
data seg size (kbytes, -d) unlimited
file size (blocks, -f) unlimited
max locked memory (kbytes, -l) 4
max memory size (kbytes, -m) unlimited
open files (-n) 2048
pipe size (512 bytes, -p) 8
stack size (kbytes, -s) 10240
cpu time (seconds, -t) unlimited
max user processes (-u) 7168
virtual memory (kbytes, -v) unlimited
$ ./a.out
Segmentation fault (core dumped)
$ ls -l core.*
-rw------- 1 uniware uniware 53248 Jun 30 17:10 core.9128
×¢Òâ¿´ÉÏÊöµÄÊä³öÐÅÏ¢£¬¶àÁ˸ö(core dumped)¡£È·Êµ²úÉúÁËÒ»¸öcoreÎļþ£¬9128ÊǸýø³ÌµÄPID¡£ÎÒÃÇÓÃGDBÀ´¿´¿´Õâ¸öcore¡£
$ gdb --core=core.9128
GNU gdb Asianux (6.0post-0.20040223.17.1AX)
Copyright 2004 Free Software Foundation, Inc.
GDB is free software, covered by the G


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