コード例 #1
0
ファイル: syscall.c プロジェクト: masatake/strace
/*
 * Returns:
 * 0: "ignore this ptrace stop", bail out silently.
 * 1: ok, decoded; call
 *    syscall_entering_finish(tcp, syscall_entering_trace(tcp, ...)).
 * other: error; call syscall_entering_finish(tcp, res), where res is the value
 *    returned.
 */
int
syscall_entering_decode(struct tcb *tcp)
{
	int res = get_scno(tcp);
	if (res == 0)
		return res;
	int scno_good = res;
	if (res != 1 || (res = get_syscall_args(tcp)) != 1) {
		printleader(tcp);
		tprintf("%s(", scno_good == 1 ? tcp->s_ent->sys_name : "????");
		/*
		 * " <unavailable>" will be added later by the code which
		 * detects ptrace errors.
		 */
		return res;
	}

#ifdef LINUX_MIPSO32
	if (SEN_syscall == tcp->s_ent->sen)
		decode_mips_subcall(tcp);
#endif

#if defined(SYS_socket_subcall) || defined(SYS_ipc_subcall)
	switch (tcp->s_ent->sen) {
# ifdef SYS_socket_subcall
		case SEN_socketcall:
			decode_socket_subcall(tcp);
			break;
# endif
# ifdef SYS_ipc_subcall
		case SEN_ipc:
			decode_ipc_subcall(tcp);
			break;
# endif
	}
#endif

	return 1;
}
コード例 #2
0
ファイル: syscall.c プロジェクト: bigzz/strace_android
static int
trace_syscall_entering(struct tcb *tcp)
{
	int res, scno_good;

	scno_good = res = get_scno(tcp);
	if (res == 0)
		return res;
	if (res == 1)
		res = get_syscall_args(tcp);

	if (res != 1) {
		printleader(tcp);
		if (scno_good != 1)
			tprints("????" /* anti-trigraph gap */ "(");
		else if (tcp->qual_flg & UNDEFINED_SCNO)
			tprintf("%s(", undefined_scno_name(tcp));
		else
			tprintf("%s(", tcp->s_ent->sys_name);
		/*
		 * " <unavailable>" will be added later by the code which
		 * detects ptrace errors.
		 */
		goto ret;
	}

	if (   sys_execve == tcp->s_ent->sys_func
# if defined(SPARC) || defined(SPARC64)
	    || sys_execv == tcp->s_ent->sys_func
# endif
	   ) {
		hide_log_until_execve = 0;
	}

#if defined(SYS_socket_subcall) || defined(SYS_ipc_subcall)
	while (1) {
# ifdef SYS_socket_subcall
		if (tcp->s_ent->sys_func == sys_socketcall) {
			decode_socket_subcall(tcp);
			break;
		}
# endif
# ifdef SYS_ipc_subcall
		if (tcp->s_ent->sys_func == sys_ipc) {
			decode_ipc_subcall(tcp);
			break;
		}
# endif
		break;
	}
#endif

	if (!(tcp->qual_flg & QUAL_TRACE)
	 || (tracing_paths && !pathtrace_match(tcp))
	) {
		tcp->flags |= TCB_INSYSCALL | TCB_FILTERED;
		return 0;
	}

	tcp->flags &= ~TCB_FILTERED;

	if (cflag == CFLAG_ONLY_STATS || hide_log_until_execve) {
		res = 0;
		goto ret;
	}

#ifdef USE_LIBUNWIND
	if (stack_trace_enabled) {
		if (tcp->s_ent->sys_flags & STACKTRACE_CAPTURE_ON_ENTER)
			unwind_capture_stacktrace(tcp);
	}
#endif

	printleader(tcp);
	if (tcp->qual_flg & UNDEFINED_SCNO)
		tprintf("%s(", undefined_scno_name(tcp));
	else
		tprintf("%s(", tcp->s_ent->sys_name);
	if ((tcp->qual_flg & QUAL_RAW) && tcp->s_ent->sys_func != sys_exit)
		res = printargs(tcp);
	else
		res = tcp->s_ent->sys_func(tcp);

	fflush(tcp->outf);
 ret:
	tcp->flags |= TCB_INSYSCALL;
	/* Measure the entrance time as late as possible to avoid errors. */
	if (Tflag || cflag)
		gettimeofday(&tcp->etime, NULL);
	return res;
}
コード例 #3
0
static int
trace_syscall_entering(struct tcb *tcp, unsigned int *sig)
{
	int res, scno_good;

	scno_good = res = get_scno(tcp);
	if (res == 0)
		return res;
	if (res == 1)
		res = get_syscall_args(tcp);

	if (res != 1) {
		printleader(tcp);
		tprintf("%s(", scno_good == 1 ? tcp->s_ent->sys_name : "????");
		/*
		 * " <unavailable>" will be added later by the code which
		 * detects ptrace errors.
		 */
		goto ret;
	}

#ifdef LINUX_MIPSO32
	if (SEN_syscall == tcp->s_ent->sen)
		decode_mips_subcall(tcp);
#endif

#if defined(SYS_socket_subcall) || defined(SYS_ipc_subcall)
	switch (tcp->s_ent->sen) {
# ifdef SYS_socket_subcall
		case SEN_socketcall:
			decode_socket_subcall(tcp);
			break;
# endif
# ifdef SYS_ipc_subcall
		case SEN_ipc:
			decode_ipc_subcall(tcp);
			break;
# endif
	}
#endif

	/* Restrain from fault injection while the trace executes strace code. */
	if (hide_log(tcp)) {
		tcp->qual_flg &= ~QUAL_FAULT;
	}

	switch (tcp->s_ent->sen) {
		case SEN_execve:
		case SEN_execveat:
#if defined SPARC || defined SPARC64
		case SEN_execv:
#endif
			tcp->flags &= ~TCB_HIDE_LOG;
			break;
	}

	if (!(tcp->qual_flg & QUAL_TRACE)
	 || (tracing_paths && !pathtrace_match(tcp))
	) {
		tcp->flags |= TCB_INSYSCALL | TCB_FILTERED;
		tcp->sys_func_rval = 0;
		return 0;
	}

	tcp->flags &= ~TCB_FILTERED;

	if (hide_log(tcp)) {
		res = 0;
		goto ret;
	}

	if (tcp->qual_flg & QUAL_FAULT)
		inject_syscall_fault_entering(tcp, sig);

	if (cflag == CFLAG_ONLY_STATS) {
		res = 0;
		goto ret;
	}

#ifdef USE_LIBUNWIND
	if (stack_trace_enabled) {
		if (tcp->s_ent->sys_flags & STACKTRACE_CAPTURE_ON_ENTER)
			unwind_capture_stacktrace(tcp);
	}
#endif

	printleader(tcp);
	tprintf("%s(", tcp->s_ent->sys_name);
	if (tcp->qual_flg & QUAL_RAW)
		res = printargs(tcp);
	else
		res = tcp->s_ent->sys_func(tcp);

	fflush(tcp->outf);
 ret:
	tcp->flags |= TCB_INSYSCALL;
	tcp->sys_func_rval = res;
	/* Measure the entrance time as late as possible to avoid errors. */
	if (Tflag || cflag)
		gettimeofday(&tcp->etime, NULL);
	return res;
}