PTRACE_TRACEME, followed (typically) by an execve(2). Threads created using the clone(2) CLONE_THREAD flag.)Ī process can initiate a trace by calling fork(2) and having the resulting child do a (Note that in this page, a "multithreaded process" means a thread group consisting of Where pid is the thread ID of the corresponding Linux thread. PtraceĬommands are always sent to a specific tracee using a call of the form "tracee" always means "(one) thread", never "a (possibly multithreaded) process". (potentially different) tracer, or left not attached and thus not debugged. Per thread: in a multithreaded process, every thread can be individually attached to a It is primarily used to implement breakpoint debugging andĪ tracee first needs to be attached to the tracer. The ptrace() system call provides a means by which one process (the "tracer") may observeĪnd control the execution of another process (the "tracee"), and examine and change the SYNOPSIS #include long ptrace(enum _ptrace_request request, pid_t pid, void * addr, void * data ) DESCRIPTION
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