欢迎转载,转载请注明出处http://forever.blog.chinaunix.net
Author: Tony
现场程序出现bug,由于时间紧急需要将进程重启,为了保留调试信息一般会让进程coredump。而如果这个时候你发现进程启动时候的limits没有合理设置,因为core文件大小的限制无法coredump,怎么办?
现场程序因为启动时没有合理设置open files大小,导致无法继续接受请求,而有不能重启网元,怎么办?
其实从内核2.6.36开始,已经增加了系统调用prlimit设置正在运行进程的limits,但是由于SLES SP2的util linux版本太低,并不能直接使用,于是开发了一个小工具processlimit。
使用方法跟ulimit相似。
processlimit使用实例:
修改进程A的core file size为无限制: processlimit -p `pidof A` -c unlimited
修改进程B的open files为4096: processlimit -p `pidof B` -n 4096
processlimit代码:
-
/*******************************************************************************
-
This program is used to change a runing process
-
-
such as:
-
There is a bug on program A which is runing, but it started with core
-
size 1K. How to coredump it?
-
-
Yeah, processlimit can do
-
#processlimit -p `pidof A` -c unlimited
-
#kill -6 `pidof A`
-
-
-
Copyright(c) 2008-2013
-
-
This program is free software; you can redistribute it and/or modify it
-
under the terms and conditions of the GNU General Public License,
-
version 2, as published by the Free Software Foundation.
-
-
This program is distributed in the hope 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.
-
-
The full GNU General Public License is included in this distribution in
-
the file called "COPYING".
-
-
Version: 0.1
-
-
Date: 2013-09-27 14:02:47 CST
-
-
Contact Information:
-
Tony <tingw.liu@gmail.com>
-
Jiangxi Road 11, Qingdao, China.
-
*******************************************************************************/
-
-
-
-
-
#include <stdio.h>
-
#include <string.h>
-
#include <unistd.h>
-
#include <sys/time.h>
-
#include <sys/resource.h>
-
#include <stdlib.h>
-
#include <limits.h>
-
#include <getopt.h>
-
-
-
#define SYS_PRLIMIT 302
-
-
char option;
-
const char *options = "hc:d:f:p:n:s:";
-
const struct option long_options[]={
-
{"help", 0, NULL, 'h'},
-
{"pid", 1, NULL, 'p'},
-
{"core size", 1, NULL, 'c'},
-
{"data seg size", 1, NULL, 'd'},
-
{"file size", 1, NULL, 'f'},
-
{"open files", 1, NULL, 'n'},
-
{"stack size", 1, NULL, 's'},
-
{NULL, 0, NULL, 0}
-
};
-
-
void help()
-
{
-
printf("Usage: processlimit -p pid [-cdfns] [limit]\n");
-
printf("\nIt is similar to ulimit which for running process,"
-
"you can get param information from 'unlimit -a'!\n");
-
printf("Caution: All value unit is 1 (blocks, bytes, files...)\n");
-
printf("\n\nAny question to Tony \n");
-
exit(-1);
-
}
-
-
int main(int argc, char **argv)
-
{
-
unsigned int pid = 0;
-
struct rlimit newlimit;
-
long int value;
-
char *softlimit;
-
int ret, type = 0;
-
int done = 0;
-
opterr = 0;
-
while ((option = getopt_long(argc, argv, options, long_options, NULL)) != -1)
-
{
-
switch (option)
-
{
-
case 'h':
-
help();
-
break;
-
case 'p':
-
pid = atoi(optarg);
-
break;
-
case 'c':
-
softlimit = strdup(optarg);
-
type = RLIMIT_CORE;
-
++done;
-
break;
-
case 'd':
-
softlimit = strdup(optarg);
-
type = RLIMIT_DATA;
-
++done;
-
break;
-
case 'f':
-
softlimit = strdup(optarg);
-
type = RLIMIT_FSIZE;
-
++done;
-
break;
-
case 'n':
-
softlimit = strdup(optarg);
-
type = RLIMIT_NOFILE;
-
++done;
-
break;
-
case 's':
-
softlimit = strdup(optarg);
-
type = RLIMIT_STACK;
-
++done;
-
break;
-
default:
-
help();
-
}
-
}
-
if (pid == 0 || done != 1)
-
help();
-
-
if (strncmp(softlimit, "unlimited", strlen(softlimit)) == 0) {
-
newlimit.rlim_cur = RLIM_INFINITY;
-
newlimit.rlim_max = RLIM_INFINITY;
-
} else {
-
value = strtol(softlimit, NULL, 10);
-
if (value == LONG_MIN || value == LONG_MAX) {
-
printf("Can't convert softlimit to long int\n");
-
return -1;
-
}
-
newlimit.rlim_cur = value;
-
newlimit.rlim_max = value;
-
}
-
free(softlimit);
-
ret = syscall(SYS_PRLIMIT, pid, type, &newlimit, NULL);
-
if (ret) {
-
printf("Can't change softlimt and hardlimit!\n");
-
return -1;
-
}
-
}
阅读(1635) | 评论(0) | 转发(0) |