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e16a7d8f3b
`et` means `expandtab`. ```sh rg 'vi: .* :vi' -l -0 | \ xargs -0 sed -i '' 's/vi: \(.*\) et\(.*\) :vi/vi: \1 xoet\2:vi/' rg 'vi: .* :vi' -l -0 | \ xargs -0 sed -i '' 's/vi: \(.*\)noet\(.*\):vi/vi: \1et\2 :vi/' rg 'vi: .* :vi' -l -0 | \ xargs -0 sed -i '' 's/vi: \(.*\)xoet\(.*\):vi/vi: \1noet\2:vi/' ```
119 lines
4.9 KiB
C
119 lines
4.9 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│ vi: set et ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi │
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 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/assert.h"
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#include "libc/calls/internal.h"
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#include "libc/calls/struct/fd.internal.h"
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#include "libc/calls/struct/sigset.internal.h"
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#include "libc/calls/syscall-nt.internal.h"
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#include "libc/errno.h"
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#include "libc/fmt/itoa.h"
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#include "libc/intrin/kprintf.h"
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#include "libc/mem/mem.h"
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#include "libc/nt/enum/processaccess.h"
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#include "libc/nt/enum/startf.h"
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#include "libc/nt/errors.h"
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#include "libc/nt/files.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/startupinfo.h"
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#include "libc/proc/describefds.internal.h"
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#include "libc/proc/ntspawn.h"
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#include "libc/str/str.h"
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#include "libc/sysv/consts/at.h"
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#include "libc/sysv/consts/o.h"
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#include "libc/sysv/errfuns.h"
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#include "libc/thread/posixthread.internal.h"
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#include "libc/thread/thread.h"
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#ifdef __x86_64__
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textwindows int sys_execve_nt(const char *program, char *const argv[],
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char *const envp[]) {
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// execve() needs to be @asyncsignalsafe
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sigset_t sigmask = __sig_block();
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_pthread_lock();
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// new process should be a child of our parent
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int64_t hParentProcess;
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int ppid = sys_getppid_nt();
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if (!(hParentProcess = OpenProcess(
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kNtProcessDupHandle | kNtProcessCreateProcess, false, ppid))) {
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_pthread_unlock();
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__sig_unblock(sigmask);
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return -1;
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}
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// inherit signal mask
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char maskvar[6 + 21];
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FormatUint64(stpcpy(maskvar, "_MASK="), sigmask);
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// define stdio handles for the spawned subprocess
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struct NtStartupInfo si = {
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.cb = sizeof(struct NtStartupInfo),
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.dwFlags = kNtStartfUsestdhandles,
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};
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for (int fd = 0; fd < 3; ++fd) {
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if (!__is_cloexec(g_fds.p + fd)) {
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si.stdiofds[fd] = g_fds.p[fd].handle;
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} else {
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si.stdiofds[fd] = -1;
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}
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}
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// pass serialized file descriptor table in environment
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char *fdspec;
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int64_t *lpExplicitHandles;
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uint32_t dwExplicitHandleCount;
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if (!(fdspec = __describe_fds(g_fds.p, g_fds.n, &si, hParentProcess,
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&lpExplicitHandles, &dwExplicitHandleCount))) {
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CloseHandle(hParentProcess);
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_pthread_unlock();
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__sig_unblock(sigmask);
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return -1;
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}
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// launch the process
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struct NtProcessInformation pi;
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int rc = ntspawn(AT_FDCWD, program, argv, envp,
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(char *[]){fdspec, maskvar, 0}, 0, 0, hParentProcess,
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lpExplicitHandles, dwExplicitHandleCount, &si, &pi);
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__undescribe_fds(hParentProcess, lpExplicitHandles, dwExplicitHandleCount);
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if (rc == -1) {
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free(fdspec);
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CloseHandle(hParentProcess);
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_pthread_unlock();
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__sig_unblock(sigmask);
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if (GetLastError() == kNtErrorSharingViolation) {
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return etxtbsy();
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} else {
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return -1;
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}
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}
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// give child to libc/proc/proc.c worker thread in parent
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int64_t handle;
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unassert(DuplicateHandle(GetCurrentProcess(), pi.hProcess, hParentProcess,
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&handle, 0, false, kNtDuplicateSameAccess));
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unassert(!(handle & 0xFFFFFFFFFF000000));
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TerminateThisProcess(0x23000000u | handle);
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}
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#endif /* __x86_64__ */
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