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Use pipe2 if available

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Kovid Goyal 2019-03-01 06:55:40 +05:30
parent 86eb977bb9
commit a2b16ded41
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1 changed files with 38 additions and 21 deletions
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49
src/calibre/gui2/__init__.py
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@ -1,27 +1,40 @@
__license__ = 'GPL v3'
__copyright__ = '2008, Kovid Goyal <kovid at kovidgoyal.net>'
""" The GUI """
import os, sys, Queue, threading, glob, signal
import glob
import os
import Queue
import signal
import sys
import threading
from contextlib import contextmanager
from threading import RLock, Lock
from PyQt5.QtWidgets import QStyle # Gives a nicer error message than import from Qt
from PyQt5.Qt import (
QFileInfo, QObject, QBuffer, Qt, QByteArray, QTranslator, QSocketNotifier,
QCoreApplication, QThread, QEvent, QTimer, pyqtSignal, QDateTime, QFontMetrics,
QDesktopServices, QFileDialog, QFileIconProvider, QSettings, QIcon, QStringListModel,
QApplication, QDialog, QUrl, QFont, QFontDatabase, QLocale, QFontInfo, QT_VERSION)
from threading import Lock, RLock
from calibre import prints, as_unicode
from calibre.constants import (islinux, iswindows, isbsd, isfrozen, isosx, is_running_from_develop,
plugins, config_dir, filesystem_encoding, isxp, DEBUG, __version__, __appname__ as APP_UID)
from calibre.ptempfile import base_dir
from calibre.gui2.linux_file_dialogs import check_for_linux_native_dialogs, linux_native_dialog
from calibre.gui2.qt_file_dialogs import FileDialog
from calibre.utils.config import Config, ConfigProxy, dynamic, JSONConfig
from PyQt5.Qt import (
QT_VERSION, QApplication, QBuffer, QByteArray, QCoreApplication, QDateTime,
QDesktopServices, QDialog, QEvent, QFileDialog, QFileIconProvider, QFileInfo,
QFont, QFontDatabase, QFontInfo, QFontMetrics, QIcon, QLocale, QObject,
QSettings, QSocketNotifier, QStringListModel, Qt, QThread, QTimer, QTranslator,
QUrl, pyqtSignal
)
from PyQt5.QtWidgets import QStyle # Gives a nicer error message than import from Qt
from calibre import as_unicode, prints
from calibre.constants import (
DEBUG, __appname__ as APP_UID, __version__, config_dir, filesystem_encoding,
is_running_from_develop, isbsd, isfrozen, islinux, isosx, iswindows, isxp,
plugins
)
from calibre.ebooks.metadata import MetaInformation
from calibre.gui2.linux_file_dialogs import (
check_for_linux_native_dialogs, linux_native_dialog
)
from calibre.gui2.qt_file_dialogs import FileDialog
from calibre.ptempfile import base_dir
from calibre.utils.config import Config, ConfigProxy, JSONConfig, dynamic
from calibre.utils.date import UNDEFINED_DATE
from calibre.utils.localization import get_lang
from calibre.utils.file_type_icons import EXT_MAP
from calibre.utils.localization import get_lang
try:
NO_URL_FORMATTING = QUrl.None_
@ -1036,11 +1049,15 @@ class Application(QApplication):
def setup_unix_signals(self):
import fcntl
if hasattr(os, 'pipe2'):
read_fd, write_fd = os.pipe2(os.O_CLOEXEC | os.O_NONBLOCK)
else:
read_fd, write_fd = os.pipe()
cloexec_flag = getattr(fcntl, 'FD_CLOEXEC', 1)
for fd in (read_fd, write_fd):
flags = fcntl.fcntl(fd, fcntl.F_GETFD)
fcntl.fcntl(fd, fcntl.F_SETFD, flags | cloexec_flag | os.O_NONBLOCK)
for sig in (signal.SIGINT, signal.SIGTERM):
signal.signal(sig, lambda x, y: None)
signal.siginterrupt(sig, False)