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/*
MIT License

Copyright (c) 2019 win32ports

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
*/
#ifdef WIN32

#include <stdlib.h>
#include "wait.h"

int __filter_anychild (PROCESSENTRY32W * pe, DWORD pid)
{
    (void) pid;
    return pe->th32ParentProcessID == GetCurrentProcessId();
}

int __filter_pid (PROCESSENTRY32W * pe, DWORD pid)
{
    return pe->th32ProcessID == pid;
}

/*
FIXME: causes FILETIME to conflict
static void __filetime2timeval(FILETIME time, struct timeval * out)
{
    unsigned long long value = time.dwHighDateTime;
    value = (value << 32) | time.dwLowDateTime;
    out->tv_sec = (long)(value / 1000000);
    out->tv_usec = (long)(value % 1000000);
}
*/

int __waitpid_internal (pid_t pid, int * status, int options,
			siginfo_t * infop, struct rusage * rusage)
{
    int saved_status = 0;
    HANDLE hProcess = INVALID_HANDLE_VALUE, hSnapshot = INVALID_HANDLE_VALUE;
    int (*filter)(PROCESSENTRY32W*, DWORD);
    PROCESSENTRY32W pe;
    DWORD wait_status = 0, exit_code = 0;
    int nohang = WNOHANG == (WNOHANG & options);
    options &= ~(WUNTRACED | __WNOWAIT | __WCONTINUED | WNOHANG);
    if (options)
    {
        errno = -EINVAL;
        return -1;
    }

    if (pid == -1)
    {
        /* wait for any child */
        filter = __filter_anychild;
    }
    else if (pid < -1)
    {
        /* wait for any process from the group */
        abort(); /* not implemented */
    }
    else if (pid == 0)
    {
        /* wait for any process from the current group */
        abort(); /* not implemented */
    }
    else
    {
        /* wait for process with given pid */
        filter = __filter_pid;
    }

    hSnapshot = CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0);
    if (INVALID_HANDLE_VALUE == hSnapshot)
    {
        errno = ECHILD;
        return -1;
    }
    pe.dwSize = sizeof(pe);
    if (!Process32FirstW(hSnapshot, &pe))
    {
        CloseHandle(hSnapshot);
        errno = ECHILD;
        return -1;
    }
    do
    {
        if (filter(&pe, pid))
        {    
            hProcess = OpenProcess(SYNCHRONIZE | PROCESS_QUERY_INFORMATION, 0, pe.th32ProcessID);
            if (INVALID_HANDLE_VALUE == hProcess)
            {
                CloseHandle(hSnapshot);
                errno = ECHILD;
                return -1;
            }
            break;
        }
    }
    while (Process32NextW(hSnapshot, &pe));
    if (INVALID_HANDLE_VALUE == hProcess)
    {
        CloseHandle(hSnapshot);
        errno = ECHILD;
        return -1;
    }

    wait_status = WaitForSingleObject(hProcess, nohang ? 0 : INFINITE);

    if (! wait_status)
    {
        if (GetExitCodeProcess(hProcess, &exit_code))
            saved_status |= (exit_code & 0xFF) << 8;
    }
    else if (WAIT_TIMEOUT == wait_status && nohang)
    {
        return 0;
    }
    else
    {
        CloseHandle(hProcess);
        CloseHandle(hSnapshot);
        errno = ECHILD;
        return -1;
    }
    if (rusage)
    {
        memset(rusage, 0, sizeof(*rusage));
        /*
        FIXME: causes FILETIME to conflict
        FILETIME creation_time, exit_time, kernel_time, user_time;
        if (GetProcessTimes(hProcess, &creation_time, &exit_time, &kernel_time, &user_time))
        {
             __filetime2timeval(kernel_time, &rusage->ru_stime);
             __filetime2timeval(user_time, &rusage->ru_utime);
        }
        */
    }
    if (infop)
    {
        memset(infop, 0, sizeof(*infop));
    }

    CloseHandle(hProcess);
    CloseHandle(hSnapshot);

    if (status)
        *status = saved_status;

    return pe.th32ParentProcessID;
}

int waitpid(pid_t pid, int * status, int options)
{
    return __waitpid_internal(pid, status, options, NULL, NULL);
}

int wait(int *status)
{
    return __waitpid_internal(-1, status, 0, NULL, NULL);
}

int waitid(idtype_t idtype, id_t id, siginfo_t * infop, int options)
{
    pid_t pid;
    switch (idtype)
    {
    case P_PID: pid = id; break;
    case P_PGID: pid = -(pid_t)id; break;
    case P_ALL: pid = 0; break;
    default: errno = EINVAL; return -1;
    }
    return __waitpid_internal(pid, NULL, options, infop, NULL);
}

pid_t wait3(int * status, int options, struct rusage * rusage)
{
    return __waitpid_internal(-1, status, options, NULL, rusage);
}

pid_t wait4(pid_t pid, int * status, int options, struct rusage * rusage)
{
    return __waitpid_internal(pid, status, options, NULL, rusage);
}

#else

void _kc3_wait (void) {}

#endif
kc3-lang/kc3/libkc3/wait.c

Commit

libkc3/wait.c
