获取运行firefox进程的PID

Question

如何在C中获得“firefox”进程的PID？

在此代码中，system仅返回0，表示成功。我怎样才能获得PID？

int x = system("pidof -s firefox");
printf("%d\n", x);

Answer 1

popen是你想要的：它打开一个进程，打开进程的输出可以读取就像用fopen打开的文件流一样：

FILE *f = popen("pgrep firefox", "r");
if (NULL == f)
{
    perror("popen");
}
else
{   
    char buffer[128];
    while (fgets(buffer, sizeof buffer, f))
    {
         // do something with read line
         int pid;
         sscanf(buffer, "%d", &pid)
    }
    // close the process
    pclose(f);
}

请参阅man popen