mirrors/cosmopolitan
1
0
Fork 0
mirror of https://github.com/jart/cosmopolitan.git synced 2025-07-07 03:38:31 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions

Initial import

Browse source
This commit is contained in:
Justine Tunney 2020-06-15 07:18:57 -07:00
commit c91b3c5006
14915 changed files with 590219 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

73
libc/calls/getuid.c Normal file
View file

@ -0,0 +1,73 @@
/*-*- 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/macros.h"
#include "libc/nt/accounting.h"
#include "libc/runtime/runtime.h"
#include "libc/str/knuthmultiplicativehash.h"
#include "libc/str/str.h"
#include "libc/sysv/consts/auxv.h"
static textwindows noinline uint32_t GetUserNameHash(void) {
char16_t buf[257];
uint32_t size = ARRAYLEN(buf);
GetUserName(&buf, &size);
return KnuthMultiplicativeHash32(buf, size >> 1);
}
static uint32_t getuidgid(int at, uint32_t impl(void)) {
if (!IsWindows()) {
if (at != -1) {
return getauxval(at);
} else {
return impl();
}
} else {
return GetUserNameHash();
}
}
/**
* Returns real user id of process.
*
* This never fails. On Windows, which doesn't really have this concept,
* we return a deterministic value that's likely to work. On Linux, this
* is fast.
*
* @asyncsignalsafe
*/
uint32_t getuid(void) {
return getuidgid(AT_UID, getuid$sysv);
}
/**
* Returns real group id of process.
*
* This never fails. On Windows, which doesn't really have this concept,
* we return a deterministic value that's likely to work. On Linux, this
* is fast.
*
* @asyncsignalsafe
*/
uint32_t getgid(void) {
return getuidgid(AT_GID, getgid$sysv);
}