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https://github.com/jart/cosmopolitan.git
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c88f95a892
Unlike CMD.EXE, CreateProcess() doesn't care if an executable name ends with .COM or .EXE. We now have the unbourne shell and bash working well on Windows, so we don't need DOS anymore. Making this change will grant us better performance, particularly for builds, because commandv() will need to make fewer system calls. Path mangling magic still happens with WinMain() and ntspawn() in order to do things like turn \ into / so the interop works well at the borders. But all the code in libraries, which did that, has been removed. It's not possible for libraries to abstract the differences between paths.
141 lines
5.5 KiB
C
141 lines
5.5 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/calls/cp.internal.h"
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#include "libc/calls/struct/itimerval.internal.h"
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#include "libc/calls/struct/sigset.internal.h"
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#include "libc/calls/struct/timespec.h"
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#include "libc/calls/struct/timespec.internal.h"
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#include "libc/calls/struct/timeval.h"
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#include "libc/dce.h"
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#include "libc/intrin/asan.internal.h"
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#include "libc/intrin/describeflags.internal.h"
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#include "libc/intrin/strace.internal.h"
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#include "libc/sock/internal.h"
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#include "libc/sock/select.h"
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#include "libc/sock/select.internal.h"
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#include "libc/sysv/consts/nrlinux.h"
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#include "libc/sysv/errfuns.h"
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/**
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* Does what poll() does except with bitset API.
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*
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* This function is the same as saying:
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*
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* sigset_t old;
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* sigprocmask(SIG_SETMASK, sigmask, &old);
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* select(nfds, readfds, writefds, exceptfds, timeout);
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* sigprocmask(SIG_SETMASK, old, 0);
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*
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* Except it happens atomically.
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*
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* The Linux Kernel modifies the timeout parameter. This wrapper gives
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* it a local variable due to POSIX requiring that `timeout` be const.
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* If you need that information from the Linux Kernel use sys_pselect.
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*
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* This system call is supported on all platforms. It's like select()
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* except that it atomically changes the sigprocmask() during the op.
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*
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* @raise ECANCELED if thread was cancelled in masked mode
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* @raise EINTR if signal was delivered
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* @cancellationpoint
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* @asyncsignalsafe
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* @threadsafe
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* @norestart
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*/
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int pselect(int nfds, fd_set *readfds, fd_set *writefds, fd_set *exceptfds,
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const struct timespec *timeout, const sigset_t *sigmask) {
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int rc;
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struct timeval tv, *tvp;
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struct timespec ts, *tsp;
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struct {
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const sigset_t *s;
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size_t n;
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} ss;
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#ifdef SYSDEBUG
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fd_set old_readfds;
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fd_set *old_readfds_ptr = 0;
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fd_set old_writefds;
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fd_set *old_writefds_ptr = 0;
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fd_set old_exceptfds;
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fd_set *old_exceptfds_ptr = 0;
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#endif
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BEGIN_CANCELLATION_POINT;
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if (nfds < 0) {
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rc = einval();
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} else if (IsAsan() &&
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((readfds && !__asan_is_valid(readfds, FD_SIZE(nfds))) ||
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(writefds && !__asan_is_valid(writefds, FD_SIZE(nfds))) ||
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(exceptfds && !__asan_is_valid(exceptfds, FD_SIZE(nfds))) ||
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(timeout && !__asan_is_valid(timeout, sizeof(*timeout))) ||
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(sigmask && !__asan_is_valid(sigmask, sizeof(*sigmask))))) {
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rc = efault();
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} else {
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#ifdef SYSDEBUG
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if (readfds) {
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old_readfds = *readfds;
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old_readfds_ptr = &old_readfds;
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}
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if (writefds) {
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old_writefds = *writefds;
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old_writefds_ptr = &old_writefds;
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}
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if (exceptfds) {
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old_exceptfds = *exceptfds;
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old_exceptfds_ptr = &old_exceptfds;
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}
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#endif
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if (IsLinux()) {
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if (timeout) {
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ts = *timeout;
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tsp = &ts;
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} else {
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tsp = 0;
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}
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ss.s = sigmask;
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ss.n = 8;
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rc = sys_pselect(nfds, readfds, writefds, exceptfds, tsp, &ss);
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} else if (!IsWindows()) {
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rc = sys_pselect(nfds, readfds, writefds, exceptfds,
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(struct timespec *)timeout, sigmask);
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} else {
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if (timeout) {
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tv.tv_sec = timeout->tv_sec;
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tv.tv_usec = timeout->tv_nsec / 1000;
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tvp = &tv;
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} else {
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tvp = 0;
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}
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rc = sys_select_nt(nfds, readfds, writefds, exceptfds, tvp, sigmask);
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}
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}
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END_CANCELLATION_POINT;
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STRACE("pselect(%d, %s → [%s], %s → [%s], %s → [%s], %s, %s) → %d% m", nfds,
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DescribeFdSet(rc, nfds, old_readfds_ptr),
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DescribeFdSet(rc, nfds, readfds),
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DescribeFdSet(rc, nfds, old_writefds_ptr),
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DescribeFdSet(rc, nfds, writefds),
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DescribeFdSet(rc, nfds, old_exceptfds_ptr),
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DescribeFdSet(rc, nfds, exceptfds), //
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DescribeTimespec(0, timeout), //
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DescribeSigset(0, sigmask), rc);
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return rc;
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}
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