linux从内核中的pid获取进程名称
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linux get process name from pid within kernel
提问by Malesh N.
hi i have used sys_getpid() from within kernel to get process id how can I find out process name from kernel struct? does it exist in kernel??
嗨，我在内核中使用了 sys_getpid() 来获取进程 ID 如何从内核结构中找出进程名称？它存在于内核中吗？
thanks very much
非常感谢
采纳答案by Zimbabao
struct task_structcontains a member called comm, it contains executable name excluding path.
struct task_struct包含一个名为comm的成员，它包含executable name excluding path.
Get current macro from this filewill get you the name of the program that launched the current process (as in insmod / modprobe).
从此文件中获取当前宏将为您提供启动当前进程的程序的名称（如 insmod / modprobe）。
Using above info you can use get the name info.
使用上述信息，您可以使用获取名称信息。
回答by Rumple Stiltskin
Not sure, but find_task_by_pid_nsmight be useful.
不确定，但find_task_by_pid_ns可能有用。
回答by Foo Bah
you can look at the special files in /proc/<pid>/
你可以看看特殊文件 /proc/<pid>/
For example, /proc/<pid>/exeis a symlink pointing to the actual binary.
例如，/proc/<pid>/exe是指向实际二进制文件的符号链接。
/proc/<pid>/cmdlineis a null-delimited list of the command line, so the first word is the process name.
/proc/<pid>/cmdline是一个空分隔的命令行列表，所以第一个词是进程名称。
回答by jml
My kernel module loads with "modprobe -v my_module --allow-unsupported -o some-data" and I extract the "some-data" parameter. The following code gave me the entire command line, and here is how I parsed out the parameter of interest:
我的内核模块加载了“modprobe -v my_module --allow-unsupported -o some-data”，然后我提取了“some-data”参数。下面的代码给了我整个命令行，这里是我解析出感兴趣的参数的方法：
struct mm_struct *mm;
unsigned char x, cmdlen;
mm = get_task_mm(current);
down_read(&mm->mmap_sem);
cmdlen = mm->arg_end - mm->arg_start;
for(x=0; x<cmdlen; x++) {
if(*(unsigned char *)(mm->arg_start + x) == '-' && *(unsigned char *)(mm->arg_start + (x+1)) == 'o') {
break;
}
}
up_read(&mm->mmap_sem);
if(x == cmdlen) {
printk(KERN_ERR "inject: ERROR - no target specified\n");
return -EINVAL;
}
strcpy(target,(unsigned char *)(mm->arg_start + (x+3)));
"target" holds the string after the -o parameter. You can compress this somewhat - the caller (in this case, modprobe) will be the first string in mm->arg_start - to suit your needs.
“target”保存 -o 参数后的字符串。您可以稍微压缩一下 - 调用者（在本例中为 modprobe）将是 mm->arg_start 中的第一个字符串 - 以满足您的需要。
