/*
* 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;
}
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;
}
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;
}