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-\section{\module{signal} ---
-         Set handlers for asynchronous events}
-
-\declaremodule{builtin}{signal}
-\modulesynopsis{Set handlers for asynchronous events.}
-
-
-This module provides mechanisms to use signal handlers in Python.
-Some general rules for working with signals and their handlers:
-
-\begin{itemize}
-
-\item
-A handler for a particular signal, once set, remains installed until
-it is explicitly reset (Python emulates the BSD style interface
-regardless of the underlying implementation), with the exception of
-the handler for \constant{SIGCHLD}, which follows the underlying
-implementation.
-
-\item
-There is no way to ``block'' signals temporarily from critical
-sections (since this is not supported by all \UNIX{} flavors).
-
-\item
-Although Python signal handlers are called asynchronously as far as
-the Python user is concerned, they can only occur between the
-``atomic'' instructions of the Python interpreter.  This means that
-signals arriving during long calculations implemented purely in C
-(such as regular expression matches on large bodies of text) may be
-delayed for an arbitrary amount of time.
-
-\item
-When a signal arrives during an I/O operation, it is possible that the
-I/O operation raises an exception after the signal handler returns.
-This is dependent on the underlying \UNIX{} system's semantics regarding
-interrupted system calls.
-
-\item
-Because the \C{} signal handler always returns, it makes little sense to
-catch synchronous errors like \constant{SIGFPE} or \constant{SIGSEGV}.
-
-\item
-Python installs a small number of signal handlers by default:
-\constant{SIGPIPE} is ignored (so write errors on pipes and sockets can be
-reported as ordinary Python exceptions) and \constant{SIGINT} is translated
-into a \exception{KeyboardInterrupt} exception.  All of these can be
-overridden.
-
-\item
-Some care must be taken if both signals and threads are used in the
-same program.  The fundamental thing to remember in using signals and
-threads simultaneously is:\ always perform \function{signal()} operations
-in the main thread of execution.  Any thread can perform an
-\function{alarm()}, \function{getsignal()}, or \function{pause()};
-only the main thread can set a new signal handler, and the main thread
-will be the only one to receive signals (this is enforced by the
-Python \module{signal} module, even if the underlying thread
-implementation supports sending signals to individual threads).  This
-means that signals can't be used as a means of inter-thread
-communication.  Use locks instead.
-
-\end{itemize}
-
-The variables defined in the \module{signal} module are:
-
-\begin{datadesc}{SIG_DFL}
-  This is one of two standard signal handling options; it will simply
-  perform the default function for the signal.  For example, on most
-  systems the default action for \constant{SIGQUIT} is to dump core
-  and exit, while the default action for \constant{SIGCLD} is to
-  simply ignore it.
-\end{datadesc}
-
-\begin{datadesc}{SIG_IGN}
-  This is another standard signal handler, which will simply ignore
-  the given signal.
-\end{datadesc}
-
-\begin{datadesc}{SIG*}
-  All the signal numbers are defined symbolically.  For example, the
-  hangup signal is defined as \constant{signal.SIGHUP}; the variable names
-  are identical to the names used in C programs, as found in
-  \code{<signal.h>}.
-  The \UNIX{} man page for `\cfunction{signal()}' lists the existing
-  signals (on some systems this is \manpage{signal}{2}, on others the
-  list is in \manpage{signal}{7}).
-  Note that not all systems define the same set of signal names; only
-  those names defined by the system are defined by this module.
-\end{datadesc}
-
-\begin{datadesc}{NSIG}
-  One more than the number of the highest signal number.
-\end{datadesc}
-
-The \module{signal} module defines the following functions:
-
-\begin{funcdesc}{alarm}{time}
-  If \var{time} is non-zero, this function requests that a
-  \constant{SIGALRM} signal be sent to the process in \var{time} seconds.
-  Any previously scheduled alarm is canceled (only one alarm can
-  be scheduled at any time).  The returned value is then the number of
-  seconds before any previously set alarm was to have been delivered.
-  If \var{time} is zero, no alarm is scheduled, and any scheduled
-  alarm is canceled.  If the return value
-  is zero, no alarm is currently scheduled.  (See the \UNIX{} man page
-  \manpage{alarm}{2}.)
-  Availability: \UNIX.
-\end{funcdesc}
-
-\begin{funcdesc}{getsignal}{signalnum}
-  Return the current signal handler for the signal \var{signalnum}.
-  The returned value may be a callable Python object, or one of the
-  special values \constant{signal.SIG_IGN}, \constant{signal.SIG_DFL} or
-  \constant{None}.  Here, \constant{signal.SIG_IGN} means that the
-  signal was previously ignored, \constant{signal.SIG_DFL} means that the
-  default way of handling the signal was previously in use, and
-  \code{None} means that the previous signal handler was not installed
-  from Python.
-\end{funcdesc}
-
-\begin{funcdesc}{pause}{}
-  Cause the process to sleep until a signal is received; the
-  appropriate handler will then be called.  Returns nothing.  Not on
-  Windows. (See the \UNIX{} man page \manpage{signal}{2}.)
-\end{funcdesc}
-
-\begin{funcdesc}{signal}{signalnum, handler}
-  Set the handler for signal \var{signalnum} to the function
-  \var{handler}.  \var{handler} can be a callable Python object
-  taking two arguments (see below), or
-  one of the special values \constant{signal.SIG_IGN} or
-  \constant{signal.SIG_DFL}.  The previous signal handler will be returned
-  (see the description of \function{getsignal()} above).  (See the
-  \UNIX{} man page \manpage{signal}{2}.)
-
-  When threads are enabled, this function can only be called from the
-  main thread; attempting to call it from other threads will cause a
-  \exception{ValueError} exception to be raised.
-
-  The \var{handler} is called with two arguments: the signal number
-  and the current stack frame (\code{None} or a frame object;
-  for a description of frame objects, see the reference manual section
-  on the standard type hierarchy or see the attribute descriptions in
-  the \refmodule{inspect} module).
-\end{funcdesc}
-
-\subsection{Example}
-\nodename{Signal Example}
-
-Here is a minimal example program. It uses the \function{alarm()}
-function to limit the time spent waiting to open a file; this is
-useful if the file is for a serial device that may not be turned on,
-which would normally cause the \function{os.open()} to hang
-indefinitely.  The solution is to set a 5-second alarm before opening
-the file; if the operation takes too long, the alarm signal will be
-sent, and the handler raises an exception.
-
-\begin{verbatim}
-import signal, os
-
-def handler(signum, frame):
-    print 'Signal handler called with signal', signum
-    raise IOError, "Couldn't open device!"
-
-# Set the signal handler and a 5-second alarm
-signal.signal(signal.SIGALRM, handler)
-signal.alarm(5)
-
-# This open() may hang indefinitely
-fd = os.open('/dev/ttyS0', os.O_RDWR)  
-
-signal.alarm(0)          # Disable the alarm
-\end{verbatim}