#include <sys/resource.h>
int enableCoreDump(void)
{
struct rlimit r_old, r_new;
getrlimit(RLIMIT_CORE, &r_old);
printf("r_old.rlim_cur : %d, r_old.rlim_max : %d ", r_old.rlim_cur, r_old.rlim_max);
r_new.rlim_cur = RLIM_INFINITY;
r_new.rlim_max = RLIM_INFINITY;
if (setrlimit(RLIMIT_CORE, &r_new) != 0) {
getrlimit(RLIMIT_CORE, &r_old);
printf("r_old.rlim_cur : %d, r_old.rlim_max : %d ", r_old.rlim_cur, r_old.rlim_max);
}
r_new.rlim_cur = r_old.rlim_max;
r_new.rlim_max = r_old.rlim_max;
setrlimit(RLIMIT_CORE, &r_new);
getrlimit(RLIMIT_CORE, &r_old);
printf("r_old.rlim_cur : %d, r_old.rlim_max : %d ", r_old.rlim_cur, r_old.rlim_max);
return 0;
}
编译程序时注意使用 -g 标志,加入调试信息,否则调试时只能看到函数地址,看不到函数名。
程序遇到严重错误退出后,会在启动程序的目录下生成 core 文件。将 core 文件复制到主机,用交叉编译器提供的gdb 打开。
arm-linux-gdb ./a.out core
输入 where,即可看到函数在哪退出的,以及函数调用栈。下面是输入 where 后,输出的函数调用栈:
Program terminated with signal SIGSEGV, Segmentation fault.
#0 0x00008c48 in cJSON_GetArrayItem (array=<optimized out>, item=171880)
at cJSON.c:662
662 cJSON *cJSON_GetArrayItem(cJSON *array,int item) {cJSON *c=array->child; while (c && item>0) item--,c=c->next; return c;}
(gdb) where
#0 0x00008c48 in cJSON_GetArrayItem (array=<optimized out>, item=171880)
at cJSON.c:662
#1 0x0000b8dc in addItem (cacheArray=0xe1a03000, statusArray=0x29f68,
mode=CACHE_MODE_SYNC) at CacheManager.c:162
#2 0x0000b8dc in addItem (cacheArray=0xe1a03000, statusArray=0x29f68,
mode=CACHE_MODE_SYNC) at CacheManager.c:162
#3 0x00000000 in ?? ()
Backtrace stopped: frame did not save the PC