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wait_task_stopped(9) [centos man page]

WAIT_TASK_STOPPED(9)						   Driver Basics					      WAIT_TASK_STOPPED(9)

wait_task_stopped - Wait for TASK_STOPPED or TASK_TRACED SYNOPSIS
int wait_task_stopped(struct wait_opts * wo, int ptrace, struct task_struct * p); ARGUMENTS
wo wait options ptrace is the wait for ptrace p task to wait for DESCRIPTION
Handle sys_wait4 work for p in state TASK_STOPPED or TASK_TRACED. CONTEXT
read_lock(tasklist_lock), which is released if return value is non-zero. Also, grabs and releases p->sighand->siglock. RETURNS
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

explain_ptrace_or_die(3)				     Library Functions Manual					  explain_ptrace_or_die(3)

explain_ptrace_or_die - process trace and report errors SYNOPSIS
#include <libexplain/ptrace.h> long explain_ptrace_or_die(int request, pid_t pid, void *addr, void *data); long explain_ptrace_on_error(int request, pid_t pid, void *addr, void *data); DESCRIPTION
The explain_ptrace_or_die function is used to call the ptrace(2) system call. On failure an explanation will be printed to stderr, obtained from the explain_ptrace(3) function, and then the process terminates by calling exit(EXIT_FAILURE). The explain_ptrace_on_error function is used to call the ptrace(2) system call. On failure an explanation will be printed to stderr, obtained from the explain_ptrace(3) function, but still returns to the caller. request The request, exactly as to be passed to the ptrace(2) system call. pid The pid, exactly as to be passed to the ptrace(2) system call. addr The addr, exactly as to be passed to the ptrace(2) system call. data The data, exactly as to be passed to the ptrace(2) system call. RETURN VALUE
The explain_ptrace_or_die function only returns on success, see ptrace(2) for more information. On failure, prints an explanation and exits, it does not return. The explain_ptrace_on_error function always returns the value return by the wrapped ptrace(2) system call. EXAMPLE
The explain_ptrace_or_die function is intended to be used in a fashion similar to the following example: long result = explain_ptrace_or_die(request, pid, addr, data); SEE ALSO
ptrace(2) process trace explain_ptrace(3) explain ptrace(2) errors exit(2) terminate the calling process COPYRIGHT
libexplain version 0.52 Copyright (C) 2010 Peter Miller explain_ptrace_or_die(3)
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