mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-01-31 19:43:32 +00:00
4778cd4d27
This change fixes an issue with the tcflow() magic numbers that was causing bash to freeze up on Linux. While auditing termios polyfills, several other issues were identified with XNU/BSD compatibility. Out of an abundance of caution this change undefines as much surface area from libc/calls/struct/termios.h as possible, so that autoconf scripts are less likely to detect non-POSIX teletypewriter APIs that haven't been polyfilled by Cosmopolitan. This is a *breaking change* for your static archives in /opt/cosmos if you use the cosmocc toolchain. That's because this change disables the ioctl() undiamonding trick for code outside the monorepo, specifically because it'll lead to brittle ABI breakages like this. If you're using the cosmocc toolchain, you'll need to rebuild libraries like ncurses, readline, etc. Yes diamonds cause bloat. To work around that, consider using tcgetwinsize() instead of ioctl(TIOCGWINSZ) since it'll help you avoid pulling every single ioctl-related polyfill into the linkage. The cosmocc script was specifying -DNDEBUG for some reason. It's fixed.
113 lines
4.4 KiB
C
113 lines
4.4 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
|
|
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
|
|
╞══════════════════════════════════════════════════════════════════════════════╡
|
|
│ Copyright 2020 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/internal.h"
|
|
#include "libc/calls/struct/metatermios.internal.h"
|
|
#include "libc/calls/struct/termios.h"
|
|
#include "libc/calls/syscall-sysv.internal.h"
|
|
#include "libc/calls/termios.internal.h"
|
|
#include "libc/calls/ttydefaults.h"
|
|
#include "libc/dce.h"
|
|
#include "libc/intrin/asan.internal.h"
|
|
#include "libc/intrin/strace.internal.h"
|
|
#include "libc/str/str.h"
|
|
#include "libc/sysv/errfuns.h"
|
|
|
|
#define TCGETS 0x00005401 // linux
|
|
#define TIOCGETA 0x40487413 // bsd
|
|
|
|
int tcgetattr_nt(int, struct termios *);
|
|
|
|
static int tcgetattr_metal(int fd, struct termios *tio) {
|
|
bzero(tio, sizeof(*tio));
|
|
tio->c_iflag = TTYDEF_IFLAG;
|
|
tio->c_oflag = TTYDEF_OFLAG;
|
|
tio->c_lflag = TTYDEF_LFLAG;
|
|
tio->c_cflag = TTYDEF_CFLAG;
|
|
return 0;
|
|
}
|
|
|
|
static int tcgetattr_bsd(int fd, struct termios *tio) {
|
|
int rc;
|
|
union metatermios mt;
|
|
if ((rc = sys_ioctl(fd, TIOCGETA, &mt)) != -1) {
|
|
if (IsXnu()) {
|
|
COPY_TERMIOS(tio, &mt.xnu);
|
|
} else {
|
|
COPY_TERMIOS(tio, &mt.bsd);
|
|
}
|
|
}
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* Obtains the termios struct.
|
|
*
|
|
* Here are the approximate defaults you can expect across platforms:
|
|
*
|
|
* c_iflag = ICRNL IXON
|
|
* c_oflag = OPOST ONLCR NL0 CR0 TAB0 BS0 VT0 FF0
|
|
* c_cflag = ISIG CREAD CS8
|
|
* c_lflag = ISIG ICANON ECHO ECHOE ECHOK IEXTEN ECHOCTL ECHOKE
|
|
* cfgetispeed() = B38400
|
|
* cfgetospeed() = B38400
|
|
* c_cc[VINTR] = CTRL-C
|
|
* c_cc[VQUIT] = CTRL-\ # ignore this comment
|
|
* c_cc[VERASE] = CTRL-?
|
|
* c_cc[VKILL] = CTRL-U
|
|
* c_cc[VEOF] = CTRL-D
|
|
* c_cc[VTIME] = CTRL-@
|
|
* c_cc[VMIN] = CTRL-A
|
|
* c_cc[VSTART] = CTRL-Q
|
|
* c_cc[VSTOP] = CTRL-S
|
|
* c_cc[VSUSP] = CTRL-Z
|
|
* c_cc[VEOL] = CTRL-@
|
|
* c_cc[VSWTC] = CTRL-@
|
|
* c_cc[VREPRINT] = CTRL-R
|
|
* c_cc[VDISCARD] = CTRL-O
|
|
* c_cc[VWERASE] = CTRL-W
|
|
* c_cc[VLNEXT] = CTRL-V
|
|
* c_cc[VEOL2] = CTRL-@
|
|
*
|
|
* @param fd open file descriptor that isatty()
|
|
* @param tio is where result is stored
|
|
* @return 0 on success, or -1 w/ errno
|
|
* @asyncsignalsafe
|
|
*/
|
|
int tcgetattr(int fd, struct termios *tio) {
|
|
int rc;
|
|
if (fd < 0) {
|
|
rc = einval();
|
|
} else if (!tio || (IsAsan() && !__asan_is_valid(tio, sizeof(*tio)))) {
|
|
rc = efault();
|
|
} else if (fd < g_fds.n && g_fds.p[fd].kind == kFdZip) {
|
|
rc = enotty();
|
|
} else if (IsLinux()) {
|
|
rc = sys_ioctl(fd, TCGETS, tio);
|
|
} else if (IsBsd()) {
|
|
rc = tcgetattr_bsd(fd, tio);
|
|
} else if (IsMetal()) {
|
|
rc = tcgetattr_metal(fd, tio);
|
|
} else if (IsWindows()) {
|
|
rc = tcgetattr_nt(fd, tio);
|
|
} else {
|
|
rc = enosys();
|
|
}
|
|
STRACE("tcgetattr(%d, %p) → %d% m", fd, tio, rc);
|
|
return rc;
|
|
}
|