Is it possible to trace one thread from another thread using PTRACE system call in linux

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Lets say we have a process in LINUX which has two threads. Is it possible to trace one thread using another thread(main thread) using PTRACE system call.

Normally PTRACE system call is used to trace a process.Example GDB ,where GDB process will attach it to a traced process. But i am not sure whether the same PTRACE can be used for tracing threads? Please someone clarify

What I have tried:

I have not tried using PTRACE system call for tracing threads.

Posted 14-Dec-16 2:34am

chandrAN2&

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Jochen Arndt 14-Dec-16 9:11am

As far as I know (therefore as comment): Yes

But you need the thread ID (TID, same type as PID). When using pthreads note that this is not the same as the pthread ID (pthread_t).

The TID can be retrieved by the thread itself calling gettid().

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