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This commit adds a basic implementation of the ptrace syscall, which allows one process (the tracer) to control another process (the tracee). While a process is being traced, it is stopped whenever a signal is received (other than SIGCONT). The tracer can start tracing another thread with PT_ATTACH, which causes the tracee to stop. From there, the tracer can use PT_CONTINUE to continue the execution of the tracee, or use other request codes (which haven't been implemented yet) to modify the state of the tracee. Additional request codes are PT_SYSCALL, which causes the tracee to continue exection but stop at the next entry or exit from a syscall, and PT_GETREGS which fethces the last saved register set of the tracee (can be used to inspect syscall arguments and return value). A special request code is PT_TRACE_ME, which is issued by the tracee and causes it to stop when it calls execve and wait for the tracer to attach. |
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| .. | ||
| arch/i386 | ||
| cdefs.h | ||
| file.h | ||
| ioctl.h | ||
| ioctl_numbers.h | ||
| mman.h | ||
| param.h | ||
| resource.h | ||
| select.cpp | ||
| select.h | ||
| socket.cpp | ||
| socket.h | ||
| stat.h | ||
| sysmacros.h | ||
| time.h | ||
| times.h | ||
| types.h | ||
| uio.cpp | ||
| uio.h | ||
| un.h | ||
| utsname.h | ||
| wait.cpp | ||
| wait.h | ||