mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-01-31 11:37:35 +00:00
642e9cb91a
The cosmocc.zip toolchain will now include four builds of the libcosmo.a runtime libraries. You can pass the -mdbg flag if you want to debug your cosmopolitan runtime. You can pass the -moptlinux flag if you don't want windows code lurking in your binary. See tool/cosmocc/README.md for more details on how these flags may be used and their important implications.
101 lines
4.2 KiB
C
101 lines
4.2 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 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/internal.h"
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#include "libc/calls/syscall-nt.internal.h"
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#include "libc/calls/syscall-sysv.internal.h"
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#include "libc/calls/syscall_support-nt.internal.h"
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#include "libc/calls/termios.h"
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#include "libc/dce.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/fds.h"
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#include "libc/intrin/strace.h"
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#include "libc/mem/alloca.h"
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#include "libc/nt/comms.h"
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#include "libc/nt/console.h"
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#include "libc/sysv/consts/fileno.h"
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#include "libc/sysv/consts/o.h"
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#include "libc/sysv/consts/termios.h"
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#include "libc/sysv/errfuns.h"
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#define TCFLSH 0x0000540b
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#define TIOCFLUSH 0x80047410
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#define kNtPurgeTxclear 4
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#define kNtPurgeRxclear 8
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static const char *DescribeFlush(char buf[12], int action) {
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if (action == TCIFLUSH)
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return "TCIFLUSH";
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if (action == TCOFLUSH)
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return "TCOFLUSH";
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if (action == TCIOFLUSH)
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return "TCIOFLUSH";
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FormatInt32(buf, action);
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return buf;
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}
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static dontinline textwindows int sys_tcflush_nt(int fd, int queue) {
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#ifdef __x86_64__
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if (!sys_isatty(fd)) {
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return -1; // ebadf, enotty
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}
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if (queue == TCOFLUSH) {
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return 0; // windows console output is never buffered
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}
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return FlushConsoleInputBytes();
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#else
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return enosys();
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#endif
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}
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/**
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* Discards queued data on teletypewriter.
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*
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* @param queue may be one of:
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* - `TCIFLUSH` flushes data received but not read
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* - `TCOFLUSH` flushes data written but not transmitted
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* - `TCIOFLUSH` does both `TCOFLUSH` and `TCIFLUSH`
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* @return 0 on success, or -1 w/ errno
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* @raise EINVAL if `action` is invalid
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* @raise EBADF if `fd` isn't an open file descriptor
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* @raise ENOTTY if `fd` is open but not a teletypewriter
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* @raise EIO if process group of writer is orphoned, calling thread is
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* not blocking `SIGTTOU`, and process isn't ignoring `SIGTTOU`
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* @raise ENOSYS on bare metal
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* @asyncsignalsafe
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*/
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int tcflush(int fd, int queue) {
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int rc;
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if (queue != TCIFLUSH && queue != TCOFLUSH && queue != TCIOFLUSH) {
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rc = einval();
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} else if (fd < g_fds.n && g_fds.p[fd].kind == kFdZip) {
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rc = enotty();
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} else if (IsLinux()) {
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rc = sys_ioctl(fd, TCFLSH, queue);
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} else if (IsBsd()) {
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rc = sys_ioctl(fd, TIOCFLUSH, &queue);
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} else if (IsWindows()) {
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rc = sys_tcflush_nt(fd, queue);
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} else {
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rc = enosys();
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}
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STRACE("tcflush(%d, %s) → %d% m", fd, DescribeFlush(alloca(12), queue), rc);
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return rc;
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}
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