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<title>5.1 Operating System Utilities
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<H1><A NAME=
"SECTION007100000000000000000"></A><A NAME=
"os"></A>
5.1 Operating System Utilities
<dl><dt><table cellpadding=
"0" cellspacing=
"0"><tr valign=
"baseline"><td><nobr>int
<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>
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>'
<stdin
>'
</code> or
<code>'???'
</code>.
<dl><dt><table cellpadding=
"0" cellspacing=
"0"><tr valign=
"baseline"><td><nobr>long
<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>
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>.
<dl><dt><table cellpadding=
"0" cellspacing=
"0"><tr valign=
"baseline"><td><nobr>void
<b><tt id='l2h-
158' xml:id='l2h-
158'
class=
"cfunction">PyOS_AfterFork
</tt></b>(
</nobr></td><td>)
</td></tr></table></dt>
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.
<dl><dt><table cellpadding=
"0" cellspacing=
"0"><tr valign=
"baseline"><td><nobr>int
<b><tt id='l2h-
159' xml:id='l2h-
159'
class=
"cfunction">PyOS_CheckStack
</tt></b>(
</nobr></td><td>)
</td></tr></table></dt>
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
<dl><dt><table cellpadding=
"0" cellspacing=
"0"><tr valign=
"baseline"><td><nobr>PyOS_sighandler_t
<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>
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
<dl><dt><table cellpadding=
"0" cellspacing=
"0"><tr valign=
"baseline"><td><nobr>PyOS_sighandler_t
<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>
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>.
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<span class=
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2.4.2, documentation updated on
28 September
2005.
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