wait.cpp File Reference

#include <corecrt_internal.h>
#include <errno.h>
#include <process.h>
#include <stdlib.h>

Include dependency graph for wait.cpp:

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Functions
intptr_t __cdecl	_cwait (int *const exit_code_result, intptr_t const process_id, int const action_code)

Function Documentation

_cwait()

intptr_t __cdecl _cwait	(	int *const	exit_code_result,
		intptr_t const	process_id,
		int const	action_code
	)

Definition at line 42 of file wait.cpp.

{
    DBG_UNREFERENCED_PARAMETER(action_code);
    
    if (exit_code_result)
        *exit_code_result = static_cast<DWORD>(-1);
 
    // Explicitly check for process ids -1 and -2.  In Windows NT, -1 is a handle
    // to the current process and -2 is a handle to the current thread, and the
    // OS will let you wait (forever) on either.
    _VALIDATE_RETURN_NOEXC(process_id != -1 && process_id != -2, ECHILD, -1);
 
    __crt_unique_handle process_handle(reinterpret_cast<HANDLE>(process_id));
 
    // Wait for the child process and get its exit code:
    DWORD exit_code;
    if (WaitForSingleObject(process_handle.get(), static_cast<DWORD>(-1)) == 0 &&
        GetExitCodeProcess(process_handle.get(), &exit_code))
    {
        if (exit_code_result)
            *exit_code_result = exit_code;
 
        return process_id;
    }
 
    // One of the API calls failed; map the error and return failure.
    DWORD const os_error = GetLastError();
    if (os_error == ERROR_INVALID_HANDLE)
    {
        errno = ECHILD;
        _doserrno = os_error;
    }
    else
    {
        __acrt_errno_map_os_error(os_error);
    }
 
    if (exit_code_result)
        *exit_code_result = static_cast<DWORD>(-1);
 
    return -1;
}