mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-01-31 11:37:35 +00:00
3f26dfbb31
This is a breaking change. It defines the new environment variable named _COSMO_FDS_V2 which is used for inheriting non-stdio file descriptors on execve() or posix_spawn(). No effort has been spent thus far integrating with the older variable. If a new binary launches the older ones or vice versa they'll only be able to pass stdin / stdout / stderr to each other therefore it's important that you upgrade all your cosmo binaries if you depend on this functionality. You'll be glad you did because inheritance of file descriptors is more aligned with the POSIX standard than before.
88 lines
3.6 KiB
C
88 lines
3.6 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/calls/calls.h"
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#include "libc/calls/internal.h"
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#include "libc/calls/syscall_support-nt.internal.h"
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#include "libc/intrin/fds.h"
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#include "libc/nt/enum/filetype.h"
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#include "libc/nt/files.h"
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#include "libc/nt/struct/byhandlefileinformation.h"
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#include "libc/stdckdint.h"
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#include "libc/sysv/errfuns.h"
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#include "libc/thread/thread.h"
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static textwindows int64_t GetPosition(struct Fd *f, int whence) {
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switch (whence) {
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case SEEK_SET:
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return 0;
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case SEEK_CUR:
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return f->cursor->shared->pointer;
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case SEEK_END: {
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struct NtByHandleFileInformation wst;
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if (!GetFileInformationByHandle(f->handle, &wst)) {
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return __winerr();
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}
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return (wst.nFileSizeHigh + 0ull) << 32 | wst.nFileSizeLow;
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}
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default:
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return einval();
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}
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}
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static textwindows int64_t Seek(struct Fd *f, int64_t offset, int whence) {
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int64_t pos;
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if ((pos = GetPosition(f, whence)) != -1) {
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if (!ckd_add(&pos, pos, offset)) {
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if (pos >= 0) {
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return pos;
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} else {
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return einval();
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}
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} else {
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return eoverflow();
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}
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} else {
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return -1;
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}
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}
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textwindows int64_t sys_lseek_nt(int fd, int64_t offset, int whence) {
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if (__isfdkind(fd, kFdDevNull) || __isfdkind(fd, kFdDevRandom)) {
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return offset;
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} else if (__isfdkind(fd, kFdFile)) {
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struct Fd *f = g_fds.p + fd;
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int filetype = GetFileType(f->handle);
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if (filetype != kNtFileTypePipe && //
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filetype != kNtFileTypeChar && //
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f->cursor->shared) {
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int64_t res;
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__cursor_lock(f->cursor);
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if ((res = Seek(f, offset, whence)) != -1)
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f->cursor->shared->pointer = res;
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__cursor_unlock(f->cursor);
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return res;
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} else {
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return espipe();
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}
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} else if (__isfdkind(fd, kFdSocket)) {
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return espipe();
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} else {
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return ebadf();
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}
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}
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