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https://github.com/jart/cosmopolitan.git
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6f7d0cb1c3
This makes breaking changes to add underscores to many non-standard function names provided by the c library. MODE=tiny is now tinier and we now use smaller locks that are better for tiny apps in this mode. Some headers have been renamed to be in the same folder as the build package, so it'll be easier to know which build dependency is needed. Certain old misguided interfaces have been removed. Intel intrinsics headers are now listed in libc/isystem (but not in the amalgamation) to help further improve open source compatibility. Header complexity has also been reduced. Lastly, more shell scripts are now available.
73 lines
3.7 KiB
C
73 lines
3.7 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 2022 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/intrin/strace.internal.h"
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#include "libc/dce.h"
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#include "libc/intrin/asmflag.h"
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#include "libc/intrin/promises.internal.h"
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#include "libc/nt/thread.h"
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#include "libc/runtime/runtime.h"
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#include "libc/sysv/consts/nr.h"
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__msabi extern typeof(ExitThread) *const __imp_ExitThread;
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/**
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* Terminates thread with raw system call.
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*
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* If this is the main thread, or an orphaned child thread, then this
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* function is equivalent to exiting the process; however, `rc` shall
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* only be reported to the parent process on Linux, FreeBSD & Windows
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* whereas on other platforms, it'll be silently coerced to zero.
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*
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* @param rc only works on Linux and Windows
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* @see cthread_exit()
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* @threadsafe
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* @noreturn
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*/
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privileged wontreturn void _Exit1(int rc) {
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char cf;
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int ax, dx, di, si;
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STRACE("_Exit1(%d)", rc);
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if (!IsWindows() && !IsMetal()) {
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// exit() on Linux
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// thr_exit() on FreeBSD
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// __threxit() on OpenBSD
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// __lwp_exit() on NetBSD
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// __bsdthread_terminate() on XNU
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asm volatile(CFLAG_ASM("xor\t%%r10d,%%r10d\n\t"
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"syscall")
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: CFLAG_CONSTRAINT(cf), "=a"(ax), "=d"(dx), "=D"(di), "=S"(si)
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: "1"(__NR_exit), "3"(IsLinux() ? rc : 0), "4"(0), "2"(0)
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: "rcx", "r8", "r9", "r10", "r11", "memory");
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if ((IsFreebsd() && !cf && !ax) || (SupportsFreebsd() && IsTiny())) {
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// FreeBSD checks if this is either the main thread by itself, or
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// the last running child thread in which case thr_exit() returns
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// zero with an error. In that case we'll exit the whole process.
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// FreeBSD thr_exit() can even clobber registers, like r8 and r9!
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asm volatile("syscall"
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: /* no outputs */
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: "a"(__NR_exit_group), "D"(rc)
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: "rcx", "r11", "memory");
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unreachable;
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}
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} else if (IsWindows()) {
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__imp_ExitThread(rc);
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unreachable;
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}
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notpossible;
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}
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