Just can't understand UTRACE_SYSCALL_RESUMED code.
To the pointed, I tried to read the docs:
* When %UTRACE_STOP is used in @report_syscall_entry, then @task
* stops before attempting the system call. In this case, another
* @report_syscall_entry callback follows after @task resumes;
Probably I misread this comment, or code (or both) but this is not
what utrace_report_syscall_entry().
The second reporting loop is done if the tracee stops, and its
->resume = UTRACE_REPORT after wakeup.
This can happen if, during the first report, one engine returns
UTRACE_STOP and another engine returns UTRACE_REPORT.
Or, no matter how many engines we have, the tracer uses UTRACE_REPORT
to wakeup the tracee after SYSCALL_ENTRY stop.
In any case, what is the rationality?
And how can we trust "if (utrace->resume == UTRACE_REPORT)" ?
If we have multiple engines, some engine can use UTRACE_INTERRUPT ?
Oleg.
