英語 での Signal handler の使用例とその 日本語 への翻訳
{-}
-
Colloquial
-
Ecclesiastic
-
Computer
-
Programming
Signal Handlers.
Delete Signal Handler.
For details on registering signal handlers.
New Signal Handler.
The library does not install any signal handler.
C there's signal handler which calls elog.
A few older devices(HTC One X for example)do not work correctly with the signal handler.
Programming with Unix signal handlers is a non-trivial endeavor.
Extra information is available if SA_SIGINFO is set for the signal handler, as above.
Normally the signal handler should flush all open files and close.
This protects against the side effect oferrno being set by functions called from inside the signal handler.
You might do that when the signal handler is responsible for performing"real" work.
That is to say, the behaviour of such functionsis undefined when they are called from a signal handler that interrupted an unsafe function.
You must write a signal handler that catches the signal and throws a C++ exception.
Also, it is good practice to make a copy of the global variable errno andrestore it before returning from the signal handler.
Fix a race condition in a signal handler per bug 265.(Tatsuo Ishii).
If the signal handler catches something, the finished flag will be set and we will exit.
The sigaction() system call will fail and no new signal handler will be installed if one of the following occurs:.
A nice side-effect of the open() is that we're alreadyregistered with the reactor we provided it.*//* Install our signal handler.
To fix the problem, now the signal handler is blocked by using POOL_SETMASK.
Solved the portability mess by specifying sigaction(2),which provides explicit control of the semantics when a signal handler is invoked;
It is called from a separate thread, not from the signal handler, because it is not async signal safe.
(also known as POSIX.1-2001 Technical Corrigendum 2) requires an implementation to guarantee that the followingfunctions can be safely called inside a signal handler:.
By setting SIGUSR1 signal, set the signal handler so that you can bump up the message output level for debugging.
Modifié dans la version 3.5: The function now sleeps at least secs even ifthe sleep is interrupted by a signal, except if the signal handler raises an exception(see PEP 475 for the rationale).
If the call is interrupted by a signal handler, nanosleep() returns -1, sets errno to EINTR, and writes the remaining time into the structure pointed to by rem unless rem is NULL.
If an I/O call on a slow device has alreadytransferred some data by the time it is interrupted by a signal handler, then the call will return a success status(normally, the number of bytes transferred).
Changed in version 3.5:If the system call is interrupted and the signal handler does not raise an exception, the function now retries the system call instead of raising an InterruptedError exception(see PEP 475 for the rationale).
If a signal that is to be caught is received while fcntl() is waiting for a region, the fcntl()will be interrupted if the signal handler has not specified the SA_RESTART (see sigaction(2)).
Otherwise, they block until either a child changes state or a signal handler interrupts the call(assuming that system calls are not automatically restarted using the SA_RESTART flag of sigaction(2)).