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Justine Tunney 2020-06-15 07:18:57 -07:00
commit c91b3c5006
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libc/calls/getppid.c Normal file
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/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2020 Justine Alexandra Roberts Tunney │
│ │
│ This program is free software; you can redistribute it and/or modify │
│ it under the terms of the GNU General Public License as published by │
│ the Free Software Foundation; version 2 of the License. │
│ │
│ This program is distributed in the hope that it will be useful, but │
│ WITHOUT ANY WARRANTY; without even the implied warranty of │
│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
│ General Public License for more details. │
│ │
│ You should have received a copy of the GNU General Public License │
│ along with this program; if not, write to the Free Software │
│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
│ 02110-1301 USA │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/calls/calls.h"
#include "libc/calls/internal.h"
#include "libc/dce.h"
#include "libc/nt/nt/process.h"
#include "libc/nt/ntdll.h"
#include "libc/nt/process.h"
#include "libc/nt/runtime.h"
#include "libc/nt/struct/processbasicinformation.h"
static textwindows noinline int32_t getppid$nt(void) {
struct NtProcessBasicInformation ProcessInformation;
uint32_t gotsize = 0;
if (!NtError(
NtQueryInformationProcess(GetCurrentProcess(), 0, &ProcessInformation,
sizeof(ProcessInformation), &gotsize)) &&
gotsize >= sizeof(ProcessInformation) &&
ProcessInformation.InheritedFromUniqueProcessId) {
/* TODO(jart): Fix type mismatch and do we need to close this? */
return ProcessInformation.InheritedFromUniqueProcessId;
}
return GetCurrentProcessId();
}
/**
* Returns parent process id.
* @asyncsignalsafe
*/
int32_t getppid(void) {
if (!IsWindows()) {
return getppid$sysv();
} else {
return getppid$nt();
}
}