运行时转储gcov数据

https://stackoverflow.com/questions/14977285/dumping-gcov-data-at-runtime

待检测程序的main函数加入该函数：

#include <signal.h>
#include <stdio.h>
#include <stdlib.h>

void __gcov_flush();

static void catch_function(int signal) {
   __gcov_flush();
}

int main(void) {
    if (signal(SIGINT, catch_function) == SIG_ERR) {
        fputs("An error occurred while setting a signal handler.\n", stderr);
        return EXIT_FAILURE;
    }
    while(1);
}

比如：

#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <stdlib.h>
#include <dlfcn.h>
#include <signal.h>


void __gcov_flush();

static void catch_function(int signal) {
   __gcov_flush();
}
int main(int argc, char *argv[])
{   
   if (signal(SIGINT, catch_function) == SIG_ERR) {
        fputs("An error occurred while setting a signal handler.\n", stderr);
        return EXIT_FAILURE;
    }
    if (argc >=2) {
        printf("=====argc>=2\n");
    }
    printf("helloworld begin\n");

    if (argc <2){
        printf("=====argc<2\n");
    }

    while(1){

        printf("this is the server body");
        sleep(5);
	//break;
    }
    return 0;
}

当在被检测程序的运行界面按ctrl+C按钮，即生成一个.gcda文件。
该文件为追加：
https://stackoverflow.com/questions/15612077/is-there-anyway-to-merge-two-gcov-files-into-one
若需要最新的，需要删除该文件。




附录：

kill命令的使用

先用ps查找进程，然后用kill杀掉:

ps -ef | grep vim

root 19255 19224 1 05:49 pts/1 00:00:00 vim install.py
root 19257 18618 0 05:49 pts/0 00:00:00 grep vim

kill 19255