mirror of
https://github.com/jart/cosmopolitan.git
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f7ff77d865
- Invent iso8601us() for faster timestamps - Improve --strace descriptions of sigset_t - Rebuild the Landlock Make bootstrap binary - Introduce MODE=sysv for non-Windows builds - Permit OFD fcntl() locks under pledge(flock) - redbean can now protect your kernel from ddos - Have vfork() fallback to sys_fork() not fork() - Change kmalloc() to not die when out of memory - Improve documentation for some termios functions - Rewrite putenv() and friends to conform to POSIX - Fix linenoise + strace verbosity issue on Windows - Fix regressions in our ability to show backtraces - Change redbean SetHeader() to no-op if value is nil - Improve fcntl() so SQLite locks work in non-WAL mode - Remove some unnecessary work during fork() on Windows - Create redbean-based SSL reverse proxy for IPv4 TurfWar - Fix ape/apeinstall.sh warning when using non-bash shells - Add ProgramTrustedIp(), and IsTrustedIp() APIs to redbean - Support $PWD, $UID, $GID, and $EUID in command interpreter - Introduce experimental JTqFpD APE prefix for non-Windows builds - Invent blackhole daemon for firewalling IP addresses via UNIX named socket - Add ProgramTokenBucket(), AcquireToken(), and CountTokens() APIs to redbean
69 lines
3.3 KiB
C
69 lines
3.3 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 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/calls.h"
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#include "libc/calls/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/intrin/strace.internal.h"
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#include "libc/nt/comms.h"
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#include "libc/sysv/consts/termios.h"
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#include "libc/sysv/errfuns.h"
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static int sys_tcsendbreak_bsd(int fd) {
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if (sys_ioctl(fd, TIOCSBRK, 0) == -1) return -1;
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usleep(400000);
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if (sys_ioctl(fd, TIOCCBRK, 0) == -1) return -1;
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return 0;
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}
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static textwindows int sys_tcsendbreak_nt(int fd) {
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if (!__isfdopen(fd)) return ebadf();
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if (!TransmitCommChar(g_fds.p[fd].handle, '\0')) return __winerr();
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return 0;
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}
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/**
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* Sends break.
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*
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* @param fd is file descriptor of tty
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* @param duration of 0 sends a break for 0.25-0.5 seconds, and other
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* durations are treated the same by this implementation
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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 tcsendbreak(int fd, int duration) {
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int rc;
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if (IsMetal()) {
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rc = enosys();
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} else if (IsBsd()) {
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rc = sys_tcsendbreak_bsd(fd);
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} else if (!IsWindows()) {
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rc = sys_ioctl(fd, TCSBRK, 0);
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} else {
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rc = sys_tcsendbreak_nt(fd);
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}
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STRACE("tcsendbreak(%d, %u) → %d% m", fd, duration, rc);
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return rc;
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}
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