c - syscalls with PTRACE_ATTACH -


i have simple question ptrace please. here simple source code in c:

ptrace(ptrace_attach, pid, 0, 0); int status; waitpid(pid, &status, wstopped); while (1) {     ptrace(ptrace_singlestep, pid, 0, 0);     "here must display message when syscall executed." }

i want know must add in loop write message (for example "ok") when process associated pid in parameter uses syscall, without using ptrace_syscall...does have idea? example return value of call ptrace(ptrace_peekuser...) , if value not equal -1... i want return value of each syscall in process pid without using ptrace_sycall , using ptrace_attach. give thanks.


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