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<title>5.1 Operating System Utilities </title>
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<H1><A NAME="SECTION007100000000000000000"></A><A NAME="os"></A>
<BR>
5.1 Operating System Utilities
</H1>

<P>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"><td><nobr>int&nbsp;<b><tt id='l2h-156' xml:id='l2h-156' class="cfunction">Py_FdIsInteractive</tt></b>(</nobr></td><td>FILE *<var>fp</var>, char *<var>filename</var>)</td></tr></table></dt>
<dd>
  Return true (nonzero) if the standard I/O file <var>fp</var> with name
  <var>filename</var> is deemed interactive.  This is the case for files
  for which "<tt class="samp">isatty(fileno(<var>fp</var>))</tt>" is true.  If the global
  flag <tt class="cdata">Py_InteractiveFlag</tt> is true, this function also returns
  true if the <var>filename</var> pointer is <tt class="constant">NULL</tt> or if the name is
  equal to one of the strings <code>'&lt;stdin&gt;'</code> or <code>'???'</code>.
</dd></dl>

<P>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"><td><nobr>long&nbsp;<b><tt id='l2h-157' xml:id='l2h-157' class="cfunction">PyOS_GetLastModificationTime</tt></b>(</nobr></td><td>char *<var>filename</var>)</td></tr></table></dt>
<dd>
  Return the time of last modification of the file <var>filename</var>.
  The result is encoded in the same way as the timestamp returned by
  the standard C library function <tt class="cfunction">time()</tt>.
</dd></dl>

<P>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"><td><nobr>void&nbsp;<b><tt id='l2h-158' xml:id='l2h-158' class="cfunction">PyOS_AfterFork</tt></b>(</nobr></td><td>)</td></tr></table></dt>
<dd>
  Function to update some internal state after a process fork; this
  should be called in the new process if the Python interpreter will
  continue to be used.  If a new executable is loaded into the new
  process, this function does not need to be called.
</dd></dl>

<P>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"><td><nobr>int&nbsp;<b><tt id='l2h-159' xml:id='l2h-159' class="cfunction">PyOS_CheckStack</tt></b>(</nobr></td><td>)</td></tr></table></dt>
<dd>
  Return true when the interpreter runs out of stack space.  This is a
  reliable check, but is only available when <tt class="constant">USE_STACKCHECK</tt>
  is defined (currently on Windows using the Microsoft Visual C++
  compiler).  <tt class="constant">USE_STACKCHECK</tt> will be
  defined automatically; you should never change the definition in
  your own code.
</dd></dl>

<P>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"><td><nobr>PyOS_sighandler_t&nbsp;<b><tt id='l2h-160' xml:id='l2h-160' class="cfunction">PyOS_getsig</tt></b>(</nobr></td><td>int <var>i</var>)</td></tr></table></dt>
<dd>
  Return the current signal handler for signal <var>i</var>.  This is a
  thin wrapper around either <tt class="cfunction">sigaction()</tt> or
  <tt class="cfunction">signal()</tt>.  Do not call those functions directly!
  <tt class="ctype">PyOS_sighandler_t</tt> is a typedef alias for <tt class="ctype">void
  (*)(int)</tt>.
</dd></dl>

<P>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"><td><nobr>PyOS_sighandler_t&nbsp;<b><tt id='l2h-161' xml:id='l2h-161' class="cfunction">PyOS_setsig</tt></b>(</nobr></td><td>int <var>i</var>, PyOS_sighandler_t <var>h</var>)</td></tr></table></dt>
<dd>
  Set the signal handler for signal <var>i</var> to be <var>h</var>; return the
  old signal handler.  This is a thin wrapper around either
  <tt class="cfunction">sigaction()</tt> or <tt class="cfunction">signal()</tt>.  Do not call those
  functions directly!  <tt class="ctype">PyOS_sighandler_t</tt> is a typedef alias
  for <tt class="ctype">void (*)(int)</tt>.
</dd></dl>

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<span class="release-info">Release 2.4.2, documentation updated on 28 September 2005.</span>
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