82 lines
3.4 KiB
C
82 lines
3.4 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 Justine Alexandra Roberts Tunney │
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│ │
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│ This program is free software; you can redistribute it and/or modify │
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│ it under the terms of the GNU General Public License as published by │
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│ the Free Software Foundation; version 2 of the License. │
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│ │
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│ This program is distributed in the hope that it will be useful, but │
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│ WITHOUT ANY WARRANTY; without even the implied warranty of │
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│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
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│ General Public License for more details. │
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│ │
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│ You should have received a copy of the GNU General Public License │
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│ along with this program; if not, write to the Free Software │
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│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
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│ 02110-1301 USA │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/calls/calls.h"
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#include "libc/calls/internal.h"
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#include "libc/dce.h"
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#include "libc/macros.h"
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#include "libc/nt/accounting.h"
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#include "libc/runtime/runtime.h"
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#include "libc/str/str.h"
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#include "libc/sysv/consts/auxv.h"
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static uint32_t KnuthMultiplicativeHash32(const void *buf, size_t size) {
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size_t i;
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uint32_t h;
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const uint32_t kPhiPrime = 0x9e3779b1;
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const unsigned char *p = (const unsigned char *)buf;
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for (h = i = 0; i < size; i++) h = (p[i] + h) * kPhiPrime;
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return h;
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}
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static textwindows noinline uint32_t GetUserNameHash(void) {
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char16_t buf[257];
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uint32_t size = ARRAYLEN(buf);
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GetUserName(&buf, &size);
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return KnuthMultiplicativeHash32(buf, size >> 1);
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}
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static uint32_t getuidgid(int at, uint32_t impl(void)) {
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if (!IsWindows()) {
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if (at != -1) {
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return getauxval(at);
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} else {
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return impl();
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}
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} else {
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return GetUserNameHash();
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}
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}
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/**
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* Returns real user id of process.
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*
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* This never fails. On Windows, which doesn't really have this concept,
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* we return a deterministic value that's likely to work. On Linux, this
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* is fast.
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*
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* @asyncsignalsafe
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*/
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uint32_t getuid(void) {
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return getuidgid(AT_UID, getuid$sysv);
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}
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/**
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* Returns real group id of process.
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*
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* This never fails. On Windows, which doesn't really have this concept,
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* we return a deterministic value that's likely to work. On Linux, this
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* is fast.
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*
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* @asyncsignalsafe
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*/
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uint32_t getgid(void) {
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return getuidgid(AT_GID, getgid$sysv);
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}
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