mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-02-07 15:03:34 +00:00
4778cd4d27
This change fixes an issue with the tcflow() magic numbers that was causing bash to freeze up on Linux. While auditing termios polyfills, several other issues were identified with XNU/BSD compatibility. Out of an abundance of caution this change undefines as much surface area from libc/calls/struct/termios.h as possible, so that autoconf scripts are less likely to detect non-POSIX teletypewriter APIs that haven't been polyfilled by Cosmopolitan. This is a *breaking change* for your static archives in /opt/cosmos if you use the cosmocc toolchain. That's because this change disables the ioctl() undiamonding trick for code outside the monorepo, specifically because it'll lead to brittle ABI breakages like this. If you're using the cosmocc toolchain, you'll need to rebuild libraries like ncurses, readline, etc. Yes diamonds cause bloat. To work around that, consider using tcgetwinsize() instead of ioctl(TIOCGWINSZ) since it'll help you avoid pulling every single ioctl-related polyfill into the linkage. The cosmocc script was specifying -DNDEBUG for some reason. It's fixed.
100 lines
5.2 KiB
C
100 lines
5.2 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/calls/ntspawn.h"
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#include "libc/calls/syscall_support-nt.internal.h"
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#include "libc/intrin/pushpop.internal.h"
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#include "libc/macros.internal.h"
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#include "libc/nt/enum/filemapflags.h"
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#include "libc/nt/enum/pageflags.h"
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#include "libc/nt/enum/processcreationflags.h"
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#include "libc/nt/memory.h"
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#include "libc/nt/process.h"
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#include "libc/nt/runtime.h"
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#include "libc/nt/struct/processinformation.h"
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#include "libc/nt/struct/securityattributes.h"
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#include "libc/nt/struct/startupinfo.h"
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struct SpawnBlock {
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union {
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struct {
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char16_t cmdline[ARG_MAX / 2];
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char16_t envvars[ARG_MAX / 2];
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char buf[ARG_MAX];
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};
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char __pad[ROUNDUP(ARG_MAX / 2 * 3 * sizeof(char16_t), FRAMESIZE)];
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};
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};
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/**
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* Spawns process on Windows NT.
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*
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* This function delegates to CreateProcess() with UTF-8 → UTF-16
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* translation and argv escaping. Please note this will NOT escape
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* command interpreter syntax.
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*
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* @param prog won't be PATH searched
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* @param argv specifies prog arguments
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* @param envp[𝟶,m-2] specifies "foo=bar" environment variables, which
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* don't need to be passed in sorted order; however, this function
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* goes faster the closer they are to sorted
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* @param envp[m-1] is NULL
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* @param extravar is added to envp to avoid setenv() in caller
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* @param bInheritHandles means handles already marked inheritable will
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* be inherited; which, assuming the System V wrapper functions are
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* being used, should mean (1) all files and sockets that weren't
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* opened with O_CLOEXEC; and (2) all memory mappings
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* @param opt_out_lpProcessInformation can be used to return process and
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* thread IDs to parent, as well as open handles that need close()
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* @return 0 on success, or -1 w/ errno
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* @see spawnve() which abstracts this function
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*/
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textwindows int ntspawn(
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const char *prog, char *const argv[], char *const envp[],
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const char *extravar, struct NtSecurityAttributes *opt_lpProcessAttributes,
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struct NtSecurityAttributes *opt_lpThreadAttributes, bool32 bInheritHandles,
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uint32_t dwCreationFlags, const char16_t *opt_lpCurrentDirectory,
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const struct NtStartupInfo *lpStartupInfo,
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struct NtProcessInformation *opt_out_lpProcessInformation) {
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int rc;
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int64_t handle;
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struct SpawnBlock *block;
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char16_t prog16[PATH_MAX];
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rc = -1;
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block = NULL;
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if (__mkntpath(prog, prog16) == -1) return -1;
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// we can't call malloc() because we're higher in the topological order
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// we can't call kmalloc() because fork() calls this when kmalloc is locked
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if ((handle = CreateFileMapping(-1, 0, pushpop(kNtPageReadwrite), 0,
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sizeof(*block), 0)) &&
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(block = MapViewOfFileEx(handle, kNtFileMapRead | kNtFileMapWrite, 0, 0,
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sizeof(*block), 0)) &&
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mkntcmdline(block->cmdline, argv) != -1 &&
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mkntenvblock(block->envvars, envp, extravar, block->buf) != -1 &&
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CreateProcess(prog16, block->cmdline, opt_lpProcessAttributes,
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opt_lpThreadAttributes, bInheritHandles,
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dwCreationFlags | kNtCreateUnicodeEnvironment |
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kNtInheritParentAffinity,
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block->envvars, opt_lpCurrentDirectory, lpStartupInfo,
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opt_out_lpProcessInformation)) {
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rc = 0;
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}
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if (block) UnmapViewOfFile(block);
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if (handle) CloseHandle(handle);
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return __fix_enotdir(rc, prog16);
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}
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