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.
138 lines
5.2 KiB
C
138 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 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/internal.h"
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#include "libc/calls/sig.internal.h"
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#include "libc/calls/struct/iovec.h"
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#include "libc/calls/struct/sigset.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/calls/syscall_support-nt.internal.h"
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#include "libc/errno.h"
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#include "libc/intrin/atomic.h"
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#include "libc/intrin/fds.h"
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#include "libc/intrin/nomultics.h"
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#include "libc/intrin/weaken.h"
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#include "libc/nt/console.h"
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#include "libc/nt/enum/consolemodeflags.h"
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#include "libc/nt/errors.h"
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#include "libc/nt/runtime.h"
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#include "libc/sysv/consts/sicode.h"
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#include "libc/sysv/consts/sig.h"
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#include "libc/sysv/errfuns.h"
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#include "libc/thread/tls.h"
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#ifdef __x86_64__
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static inline void RaiseSignal(int sig) {
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if (_weaken(__sig_raise)) {
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_weaken(__sig_raise)(sig, SI_KERNEL);
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} else {
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TerminateThisProcess(sig);
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}
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}
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static textwindows ssize_t sys_write_nt_impl(int fd, void *data, size_t size,
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ssize_t offset,
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uint64_t waitmask) {
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struct Fd *f = g_fds.p + fd;
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bool isconsole = f->kind == kFdConsole;
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// not implemented, XNU returns eperm();
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if (f->kind == kFdDevRandom) {
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return eperm();
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}
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// determine win32 handle for writing
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int64_t handle = f->handle;
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if (isconsole && _weaken(GetConsoleOutputHandle)) {
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handle = _weaken(GetConsoleOutputHandle)();
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}
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// intercept ansi tty configuration sequences
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if (isconsole && _weaken(GetConsoleOutputHandle)) {
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_weaken(InterceptTerminalCommands)(data, size);
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}
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// perform heavy lifting
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ssize_t rc;
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rc = sys_readwrite_nt(fd, data, size, offset, handle, waitmask,
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(void *)WriteFile);
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if (rc != -2)
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return rc;
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// mops up win32 errors
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switch (GetLastError()) {
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// case kNtErrorInvalidHandle:
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// return ebadf(); /* handled by consts.sh */
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// case kNtErrorNotEnoughQuota:
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// return edquot(); /* handled by consts.sh */
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case kNtErrorBrokenPipe: // broken pipe
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case kNtErrorNoData: // closing named pipe
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RaiseSignal(SIGPIPE);
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return epipe();
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case kNtErrorAccessDenied: // write doesn't return EACCESS
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return ebadf();
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default:
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return __winerr();
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}
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}
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static textwindows ssize_t sys_write_nt2(int fd, const struct iovec *iov,
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size_t iovlen, ssize_t opt_offset,
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uint64_t waitmask) {
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ssize_t rc;
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size_t i, total;
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if (opt_offset < -1)
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return einval();
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while (iovlen && !iov[0].iov_len)
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iov++, iovlen--;
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if (iovlen) {
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for (total = i = 0; i < iovlen; ++i) {
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if (!iov[i].iov_len)
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continue;
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rc = sys_write_nt_impl(fd, iov[i].iov_base, iov[i].iov_len, opt_offset,
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waitmask);
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if (rc == -1) {
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if (total && errno != ECANCELED) {
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return total;
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} else {
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return -1;
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}
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}
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total += rc;
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if (opt_offset != -1)
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opt_offset += rc;
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if (rc < iov[i].iov_len)
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break;
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}
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return total;
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} else {
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return sys_write_nt_impl(fd, NULL, 0, opt_offset, waitmask);
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}
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}
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textwindows ssize_t sys_write_nt(int fd, const struct iovec *iov, size_t iovlen,
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ssize_t opt_offset) {
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ssize_t rc;
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sigset_t m = __sig_block();
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rc = sys_write_nt2(fd, iov, iovlen, opt_offset, m);
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__sig_unblock(m);
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return rc;
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}
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#endif /* __x86_64__ */
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