mirror of
https://github.com/jart/cosmopolitan.git
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7e0a09feec
This change ports APE Loader to Linux AARCH64, so that Raspberry Pi users can run programs like redbean, without the executable needing to modify itself. Progress has also slipped into this change on the issue of making progress better conforming to user expectations and industry standards regarding which symbols we're allowed to declare
95 lines
3.6 KiB
C
95 lines
3.6 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/assert.h"
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#include "libc/calls/calls.h"
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#include "libc/calls/syscall-sysv.internal.h"
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#include "libc/dce.h"
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#include "libc/intrin/strace.internal.h"
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#include "libc/limits.h"
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#include "libc/macros.internal.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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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 dontinline 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) & INT_MAX;
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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.
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*
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* @return user id (always successful)
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* @asyncsignalsafe
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* @threadsafe
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* @vforksafe
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*/
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uint32_t getuid(void) {
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int rc;
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if (IsMetal()) {
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rc = 0;
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} else if (!IsWindows()) {
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rc = sys_getuid();
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} else {
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rc = GetUserNameHash();
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}
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npassert(rc >= 0);
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STRACE("%s() → %d", "getuid", rc);
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return rc;
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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.
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*
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* @return group id (always successful)
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* @asyncsignalsafe
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* @threadsafe
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* @vforksafe
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*/
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uint32_t getgid(void) {
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int rc;
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if (IsMetal()) {
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rc = 0;
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} else if (!IsWindows()) {
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rc = sys_getgid();
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} else {
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rc = GetUserNameHash();
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}
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npassert(rc >= 0);
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STRACE("%s() → %d", "getgid", rc);
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return rc;
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}
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