UTRACE_FINISH_EXAMIN(9) utrace core API UTRACE_FINISH_EXAMIN(9)NAME
utrace_finish_examine - complete an examination of thread state
SYNOPSIS
int utrace_finish_examine(struct task_struct * target, struct utrace_engine * engine, struct utrace_examiner * exam);
ARGUMENTS
target
thread of interest, a struct task_struct pointer
engine
engine pointer returned by utrace_attach_task
exam
pointer passed to utrace_prepare_examine call
DESCRIPTION
This call completes an examination on the thread target begun by a paired utrace_prepare_examine call with the same arguments that returned
success (zero).
When target is current, this call is superfluous. When target is another thread, this returns zero if target has remained unscheduled since
the paired utrace_prepare_examine call returned zero.
When this returns an error, any examination done since the paired utrace_prepare_examine call is unreliable and the data extracted should
be discarded. The error is -EINVAL if engine is not keeping target stopped, or -EAGAIN if target woke up unexpectedly.
Kernel Hackers Manual 2.6. July 2010 UTRACE_FINISH_EXAMIN(9)
Check Out this Related Man Page
TASK_CURRENT_SYSCALL(9) Machine State TASK_CURRENT_SYSCALL(9)NAME
task_current_syscall - Discover what a blocked task is doing.
SYNOPSIS
int task_current_syscall(struct task_struct * target, long * callno, unsigned long args[6], unsigned int maxargs, unsigned long * sp,
unsigned long * pc);
ARGUMENTS
target
thread to examine
callno
filled with system call number or -1
args[6]
filled with maxargs system call arguments
maxargs
number of elements in args to fill
sp
filled with user stack pointer
pc
filled with user PC
DESCRIPTION
If target is blocked in a system call, returns zero with *callno set to the the call's number and args filled in with its arguments.
Registers not used for system call arguments may not be available and it is not kosher to use struct user_regset calls while the system
call is still in progress. Note we may get this result if target has finished its system call but not yet returned to user mode, such as
when it's stopped for signal handling or syscall exit tracing.
If target is blocked in the kernel during a fault or exception, returns zero with *callno set to -1 and does not fill in args. If so, it's
now safe to examine target using struct user_regset get calls as long as we're sure target won't return to user mode.
Returns -EAGAIN if target does not remain blocked.
Returns -EINVAL if maxargs is too large (maximum is six).
Kernel Hackers Manual 2.6. July 2010 TASK_CURRENT_SYSCALL(9)
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