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gh-85984: Add _POSIX_VDISABLE from unistd.h to termios module. by 8vasu · Pull Request #114985 · python/cpython · GitHub
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gh-85984: Add _POSIX_VDISABLE from unistd.h to termios module. #114985

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Merged
gpshead merged 5 commits into from
Feb 11, 2024
Merged

gh-85984: Add _POSIX_VDISABLE from unistd.h to termios module. #114985

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67bd481
Add _POSIX_VDISABLE from unistd.h to termios module.
8vasu Feb 4, 2024
60c95d4
📜🤖 Added by blurb_it.
blurb-it[bot] Feb 4, 2024
299d88e
Merge branch 'main' into termios_posix_vdisable
8vasu Feb 7, 2024
e70e309
ReSTify the NEWS entry.
gpshead Feb 11, 2024
aa71dc7
fix my news typo.
gpshead Feb 11, 2024
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Add _POSIX_VDISABLE from unistd.h to termios module. 
Signed-off-by: Soumendra Ganguly <soumendraganguly@gmail.com>
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@8vasu
8vasu committed Feb 4, 2024
commit 67bd4810aeecbcf362fa5c2e63a59eed9e1365bb
7 changes: 4 additions & 3 deletions Modules/termios.c
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Expand Up @@ -27,9 +27,7 @@

#include <termios.h>
#include <sys/ioctl.h>
#if defined(__sun) && defined(__SVR4)
# include <unistd.h> // ioctl()
#endif
#include <unistd.h> // _POSIX_VDISABLE

/* HP-UX requires that this be included to pick up MDCD, MCTS, MDSR,
* MDTR, MRI, and MRTS (apparently used internally by some things
Expand Down Expand Up @@ -1315,6 +1313,9 @@ static struct constant {
#ifdef TIOCTTYGSTRUCT
{"TIOCTTYGSTRUCT", TIOCTTYGSTRUCT},
#endif
#ifdef _POSIX_VDISABLE
{"_POSIX_VDISABLE", _POSIX_VDISABLE},
#endif

@8vasu 8vasu Feb 4, 2024

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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.

/* sentinel */
{NULL, 0}
Expand Down