WAIT_TASK_STOPPED(9) Driver Basics WAIT_TASK_STOPPED(9)NAME
wait_task_stopped - Wait for TASK_STOPPED or TASK_TRACED
int wait_task_stopped(struct wait_opts * wo, int ptrace, struct task_struct * p);
is the wait for ptrace
task to wait for
Handle sys_wait4 work for p in state TASK_STOPPED or TASK_TRACED.
read_lock(tasklist_lock), which is released if return value is non-zero. Also, grabs and releases p->sighand->siglock.
0 if wait condition didn't exist and search for other wait conditions should continue. Non-zero return, -errno on failure and p's pid on
success, implies that tasklist_lock is released and wait condition search should terminate.
COPYRIGHT Kernel Hackers Manual 3.10 June 2014 WAIT_TASK_STOPPED(9)
Check Out this Related Man Page
WAIT(2) System Calls Manual WAIT(2)NAME
wait - wait for process to terminate
Wait causes its caller to delay until a signal is received or one of its child processes terminates. If any child has died since the last
wait, return is immediate; if there are no children, return is immediate with the error bit set (resp. with a value of -1 returned). The
normal return yields the process ID of the terminated child. In the case of several children several wait calls are needed to learn of all
If (int)status is nonzero, the high byte of the word pointed to receives the low byte of the argument of exit when the child terminated.
The low byte receives the termination status of the process. See signal(2) for a list of termination statuses (signals); 0 status indi-
cates normal termination. A special status (0177) is returned for a stopped process which has not terminated and can be restarted. See
ptrace(2). If the 0200 bit of the termination status is set, a core image of the process was produced by the system.
If the parent process terminates without waiting on its children, the initialization process (process ID = 1) inherits the children.
SEE ALSO exit(2), fork(2), signal(2)DIAGNOSTICS
Returns -1 if there are no children not previously waited for.
(wait = 7.)
(process ID in r0)
(status in r1)
The high byte of the status is the low byte of r0 in the child at termination.
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