如何程序正常运行的时候，产生core文件

Two solutions:

Method 1. signal + fork + abort:

pid_t ChildPid;
int Status;
void (*PrevSIGABT)(int);

PrevSIGIOT = signal(SIGABT, SIG_DFL);
ChildPid = fork();
if (ChildPid == NULL)
abort();
else
waitpid(ChildPid, &Status, NULL);

signal(SIGABT, PrevSIGABT);

Method 2. proc + elf generator
open /proc/$pid/mem, /proc/$pid/regs, /proc/$pid/fregs, /proc/$pid/status, /proc/$pid/map
write to elf core file

Method 2 is used by gdb and gcore.