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gh-85984: Add _POSIX_VDISABLE from unistd.h to termios module.#114985
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gpshead merged 5 commits intopython:mainfrom Feb 11, 2024
Merged
gh-85984: Add _POSIX_VDISABLE from unistd.h to termios module.#114985gpshead merged 5 commits intopython:mainfrom
gpshead merged 5 commits intopython:mainfrom
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Signed-off-by: Soumendra Ganguly <soumendraganguly@gmail.com>
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8vasu
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Feb 4, 2024
| #ifdef _POSIX_VDISABLE | ||
| {"_POSIX_VDISABLE", _POSIX_VDISABLE}, | ||
| #endif | ||
|
|
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The following script uses termios._POSIX_VDISABLE to disable INTR. Then it calls stty(1) to check if INTR has successfully been disabled.
#!/usr/bin/python3
# Written and tested on Debian GNU/Linux 12 (bookworm) using stty (GNU coreutils) 9.1.
import subprocess
import termios
def stty_intr_value():
out = subprocess.run(['stty', '-a'], stdout=subprocess.PIPE, text=True).stdout
s = out.replace(";", " ")
sub = "intr = "
i = s.find(sub) + len(sub)
return s[i:].split()[0]
t = termios.tcgetattr(0)
t[6][termios.VINTR] = bytes([termios._POSIX_VDISABLE])
termios.tcsetattr(0, termios.TCSANOW, t)
assert stty_intr_value() == "<undef>"
print("PASSED")Hit Control-C after running running above script to see SIGINT not being sent.
Please run stty intr ^c to restore Control-C functionality.
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fsc-eriker
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Feb 14, 2024
…ython#114985) Signed-off-by: Soumendra Ganguly <soumendraganguly@gmail.com> Co-authored-by: Gregory P. Smith <greg@krypto.org>
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This follows #102413.
POSIX General Terminal Interface defines Special Control Characters. An example of this is the
INTRcharacter, which is usually set toControl-C, which sends theSIGINTsignal to interrupt a process running in the terminal.POSIX General Terminal Interface allows the programmer to disable these characters by setting them to
_POSIX_VDISABLE, which is defined in POSIX<unistd.h>. This is how POSIXstty(1)disables special control characters internally; for example, running the following command will disable theINTRcharacter:stty intr undefNow hitting
Control-Cwill not sendSIGINTto the running process until it is reset using the following command:stty intr ^c.At any given point of time, check all terminal settings by running
stty -a.This PR adds
_POSIX_VDISABLEto thetermiosmodule.