linux - Self attach using ptrace? -


is possible ptrace same process thread in process? found discussion @ [1] seems suggest way (may or may not work) seems bit involved me not intimately familiar pthreads api. has tried this? code pointer great.

[1] http://yarchive.net/comp/linux/ptrace_self_attach.html

you emphatically not want use posix threads (pthreads) this. posix threads introduce whole new set of application semantics not apply here.

the second paragraph explains how right way:

and first 1 found reasonable way avoid problem: debugging thread can "vfork()" (or, if vfork() bad in libc, direct "clone(clone_vfork|clone_mm)" thing) have new thread in _different_ thread group, able ptrace , "synchronized" vm, because shares other threads might want debug

this mechanism how user-space debuggers gdb(1) , crash(8) work: create either closely-coupled child process using vfork(2) or use similar linux-specific clone(2) system call.

if fact, how every program except primeval init(1) program run: current process forks, , 1 process [usually child] exec(2)' desired program overwrite execution environment.


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