mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-01-31 11:37:35 +00:00
77 lines
3.4 KiB
C
77 lines
3.4 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
|
|
│ vi: set et ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi │
|
|
╞══════════════════════════════════════════════════════════════════════════════╡
|
|
│ Copyright 2021 Justine Alexandra Roberts Tunney │
|
|
│ │
|
|
│ Permission to use, copy, modify, and/or distribute this software for │
|
|
│ any purpose with or without fee is hereby granted, provided that the │
|
|
│ above copyright notice and this permission notice appear in all copies. │
|
|
│ │
|
|
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
|
|
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
|
|
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
|
|
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
|
|
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
|
|
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
|
|
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
|
|
│ PERFORMANCE OF THIS SOFTWARE. │
|
|
╚─────────────────────────────────────────────────────────────────────────────*/
|
|
#include "libc/calls/calls.h"
|
|
#include "libc/calls/internal.h"
|
|
#include "libc/calls/syscall-sysv.internal.h"
|
|
#include "libc/calls/syscall_support-nt.internal.h"
|
|
#include "libc/dce.h"
|
|
#include "libc/intrin/strace.h"
|
|
#include "libc/nt/comms.h"
|
|
#include "libc/sysv/errfuns.h"
|
|
|
|
#define TCSBRK 0x5409 // linux
|
|
#define TIOCSBRK 0x2000747b // bsd
|
|
#define TIOCCBRK 0x2000747a // bsd
|
|
|
|
static int sys_tcsendbreak_bsd(int fd) {
|
|
if (sys_ioctl(fd, TIOCSBRK, 0) == -1)
|
|
return -1;
|
|
usleep(400000);
|
|
if (sys_ioctl(fd, TIOCCBRK, 0) == -1)
|
|
return -1;
|
|
return 0;
|
|
}
|
|
|
|
static textwindows int sys_tcsendbreak_nt(int fd) {
|
|
if (!__isfdopen(fd))
|
|
return ebadf();
|
|
if (!TransmitCommChar(g_fds.p[fd].handle, '\0'))
|
|
return __winerr();
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* Sends break.
|
|
*
|
|
* @param fd is file descriptor of tty
|
|
* @param duration of 0 sends a break for 0.25-0.5 seconds, and other
|
|
* durations are treated the same by this implementation
|
|
* @raise EBADF if `fd` isn't an open file descriptor
|
|
* @raise ENOTTY if `fd` is open but not a teletypewriter
|
|
* @raise EIO if process group of writer is orphoned, calling thread is
|
|
* not blocking `SIGTTOU`, and process isn't ignoring `SIGTTOU`
|
|
* @raise ENOSYS on bare metal
|
|
* @asyncsignalsafe
|
|
*/
|
|
int tcsendbreak(int fd, int duration) {
|
|
int rc;
|
|
if (fd < g_fds.n && g_fds.p[fd].kind == kFdZip) {
|
|
rc = enotty();
|
|
} else if (IsLinux()) {
|
|
rc = sys_ioctl(fd, TCSBRK, 0);
|
|
} else if (IsBsd()) {
|
|
rc = sys_tcsendbreak_bsd(fd);
|
|
} else if (IsWindows()) {
|
|
rc = sys_tcsendbreak_nt(fd);
|
|
} else {
|
|
rc = enosys();
|
|
}
|
|
STRACE("tcsendbreak(%d, %u) → %d% m", fd, duration, rc);
|
|
return rc;
|
|
}
|