线程名称超过15个字符？

Question

By using functions like prctl, or pthread_set_name_np it's possible to change the name of a thread. The limit both functions imposes, at least in Linux 2.6.38, is that the name cannot be longer than 15 characters (NULL termination being the 16th byte).

Where is this 15 character limit imposed, and is there any (even unorthodox) way around it?

Update :

As mentioned in the comments, this is imposed by the kernel.

The definition can be found here: http://lxr.linux.no/linux+v2.6.37/include/linux/sched.h#L245

Answer 1

15-char limit is done by kernel.

struct task_struct::comm[TASK_COMM_LEN] which is 16-byte wide.

You have to recompile kernel, if you want to increase that.

Answer 2

Although the normal task name limit is set in the kernel, you can change your command line parameters (as shown in ps ) by overwriting the memory pointed to by argv[0] . This can be used to display additional data of up to one page in size.