mirror of
https://github.com/jart/cosmopolitan.git
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965516e313
- Get SIGWINCH working again on the New Technology - Correctly handle O_NOFOLLOW in open() on Windows - Implement synthetic umask() functionality on Windows - Do a better job managing file execute access on Windows - Fill in `st_uid` and `st_gid` with username hash on Windows - Munge UNICODE control pictures into control codes on Windows - Do a better job ensuring Windows console settings are restored - Introduce KPRINTF_LOG environment variable to log kprintf to a file
121 lines
5.4 KiB
C
121 lines
5.4 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 2021 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/dce.h"
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#include "libc/intrin/promises.internal.h"
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#include "libc/intrin/strace.internal.h"
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#include "libc/intrin/weaken.h"
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#include "libc/nexgen32e/vendor.internal.h"
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#include "libc/nt/enum/status.h"
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#include "libc/nt/runtime.h"
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#include "libc/runtime/internal.h"
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#include "libc/runtime/runtime.h"
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#include "libc/sysv/consts/nr.h"
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/**
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* Terminates process, ignoring destructors and atexit() handlers.
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*
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* Exit codes are narrowed to an unsigned char on most platforms. The
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* exceptions would be Windows, NetBSD, and OpenBSD, which should let
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* you have larger exit codes.
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*
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* When running on bare metal, this function will reboot your computer
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* by hosing the interrupt descriptors and triple faulting the system.
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*
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* @asyncsignalsafe
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* @threadsafe
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* @vforksafe
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* @noreturn
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*/
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wontreturn void _Exit(int exitcode) {
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STRACE("_Exit(%d)", exitcode);
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if (!IsWindows() && !IsMetal()) {
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// On Linux _Exit1 (exit) must be called in pledge("") mode. If we
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// call _Exit (exit_group) when we haven't used pledge("stdio") then
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// it'll terminate the process instead. On OpenBSD we must not call
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// _Exit1 (__threxit) because only _Exit (exit) is whitelisted when
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// operating in pledge("") mode.
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if (!(IsLinux() && !PLEDGED(STDIO))) {
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#ifdef __x86_64__
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asm volatile("syscall"
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: /* no outputs */
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: "a"(__NR_exit_group), "D"(exitcode)
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: "rcx", "r11", "memory");
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#elif defined(__aarch64__)
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register long x0 asm("x0") = exitcode;
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asm volatile("mov\tx8,%0\n\t"
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"mov\tx16,%1\n\t"
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"svc\t0"
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: /* no outputs */
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: "i"(94), "i"(1), "r"(x0)
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: "x8", "x16", "memory");
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#else
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#error "unsupported architecture"
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#endif
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}
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// Inline _Exit1() just in case _Exit() isn't allowed by pledge()
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#ifdef __x86_64__
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asm volatile("syscall"
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: /* no outputs */
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: "a"(__NR_exit), "D"(exitcode)
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: "rcx", "r11", "memory");
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#else
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register long r0 asm("x0") = exitcode;
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asm volatile("mov\tx8,%0\n\t"
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"mov\tx16,%1\n\t"
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"svc\t0"
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: /* no outputs */
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: "i"(93), "i"(0x169), "r"(r0)
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: "x8", "memory");
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#endif
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} else if (IsWindows()) {
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uint32_t waitstatus;
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// Restoring the CMD.EXE program to its original state is critical.
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if (_weaken(__restore_console_win32)) {
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_weaken(__restore_console_win32)();
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}
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// What Microsoft calls an exit code, POSIX calls a status code. See
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// also the WEXITSTATUS() and WIFEXITED() macros that POSIX defines.
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waitstatus = exitcode;
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waitstatus <<= 8;
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// "The GetExitCodeProcess function returns a valid error code
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// defined by the application only after the thread terminates.
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// Therefore, an application should not use kNtStillActive (259) as
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// an error code (kNtStillActive is a macro for kNtStatusPending).
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// If a thread returns kNtStillActive (259) as an error code, then
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// applications that test for that value could interpret it to mean
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// that the thread is still running, and continue to test for the
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// completion of the thread after the thread has terminated, which
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// could put the application into an infinite loop." -Quoth MSDN
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if (waitstatus == kNtStillActive) {
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waitstatus = 0xc9af3d51u;
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}
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ExitProcess(waitstatus);
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}
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#ifdef __x86_64__
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asm("push\t$0\n\t"
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"push\t$0\n\t"
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"cli\n\t"
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"lidt\t(%rsp)");
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for (;;) asm("ud2");
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#else
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__builtin_unreachable();
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#endif
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}
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__strong_reference(_Exit, _exit);
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