获取运行firefox进程的PID

Question

如何获取C中“firefox”进程的PID？

在此代码中，system仅返回0，表示成功。我如何获得PID？

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

Answer 1

popen是你想要的：它会打开一个处理和输出从开放的过程是可读取就像一个文件流与fopen打开：

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); 
} 

见man popen