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https://github.com/jart/cosmopolitan.git
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ff77f2a6af
- This change fixes a bug that allowed unbuffered printf() output (to streams like stderr) to be truncated. This regression was introduced some time between now and the last release. - POSIX specifies all functions as thread safe by default. This change works towards cleaning up our use of the @threadsafe / @threadunsafe documentation annotations to reflect that. The goal is (1) to use @threadunsafe to document functions which POSIX say needn't be thread safe, and (2) use @threadsafe to document functions that we chose to implement as thread safe even though POSIX didn't mandate it. - Tidy up the clock_gettime() implementation. We're now trying out a cleaner approach to system call support that aims to maintain the Linux errno convention as long as possible. This also fixes bugs that existed previously, where the vDSO errno wasn't being translated properly. The gettimeofday() system call is now a wrapper for clock_gettime(), which reduces bloat in apps that use both. - The recently-introduced improvements to the execute bit on Windows has had bugs fixed. access(X_OK) on a directory on Windows now succeeds. fstat() will now perform the MZ/#! ReadFile() operation correctly. - Windows.h is no longer included in libc/isystem/, because it confused PCRE's build system into thinking Cosmopolitan is a WIN32 platform. Cosmo's Windows.h polyfill was never even really that good, since it only defines a subset of the subset of WIN32 APIs that Cosmo defines. - The setlongerjmp() / longerjmp() APIs are removed. While they're nice APIs that are superior to the standardized setjmp / longjmp functions, they weren't superior enough to not be dead code in the monorepo. If you use these APIs, please file an issue and they'll be restored. - The .com appending magic has now been removed from APE Loader.
91 lines
4.3 KiB
C
91 lines
4.3 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 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/dce.h"
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#include "libc/intrin/asmflag.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/runtime/syslib.internal.h"
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#include "libc/sysv/consts/nr.h"
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#include "libc/thread/tls.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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* The function you want is pthread_exit(). If you call this function
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* whilst using the pthreads then your joiners might not get woken up
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* on non-Linux platforms where we zero __get_tls()->tib_tid manually
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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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* @noreturn
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*/
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privileged wontreturn void _Exit1(int rc) {
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#ifdef __x86_64__
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char cf;
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int ax, dx, di, si;
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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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__builtin_unreachable();
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}
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} else if (IsWindows()) {
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__imp_ExitThread(rc);
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__builtin_unreachable();
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}
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notpossible;
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#elif defined(__aarch64__)
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if (IsLinux()) {
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register long r0 asm("x0") = rc;
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asm volatile("mov\tx8,%0\n\t"
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"svc\t0"
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: /* no outputs */
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: "i"(93), "r"(r0)
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: "x8", "memory");
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} else if (IsXnu()) {
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__syslib->__pthread_exit(0);
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}
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notpossible;
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#else
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#error "arch unsupported"
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#endif
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}
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