81 lines
3.3 KiB
C
81 lines
3.3 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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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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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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