mirror of https://github.com/python/cpython
485 lines
12 KiB
C
485 lines
12 KiB
C
/***********************************************************
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Copyright 1991-1995 by Stichting Mathematisch Centrum, Amsterdam,
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The Netherlands.
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All Rights Reserved
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Permission to use, copy, modify, and distribute this software and its
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documentation for any purpose and without fee is hereby granted,
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provided that the above copyright notice appear in all copies and that
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both that copyright notice and this permission notice appear in
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supporting documentation, and that the names of Stichting Mathematisch
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Centrum or CWI or Corporation for National Research Initiatives or
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CNRI not be used in advertising or publicity pertaining to
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distribution of the software without specific, written prior
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permission.
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While CWI is the initial source for this software, a modified version
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is made available by the Corporation for National Research Initiatives
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(CNRI) at the Internet address ftp://ftp.python.org.
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STICHTING MATHEMATISCH CENTRUM AND CNRI DISCLAIM ALL WARRANTIES WITH
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REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF
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MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH
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CENTRUM OR CNRI BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL
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DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
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PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
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TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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PERFORMANCE OF THIS SOFTWARE.
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******************************************************************/
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/* System module */
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/*
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Various bits of information used by the interpreter are collected in
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module 'sys'.
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Function member:
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- exit(sts): raise SystemExit
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Data members:
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- stdin, stdout, stderr: standard file objects
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- modules: the table of modules (dictionary)
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- path: module search path (list of strings)
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- argv: script arguments (list of strings)
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- ps1, ps2: optional primary and secondary prompts (strings)
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*/
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#include "Python.h"
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#include "osdefs.h"
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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static PyObject *sysdict;
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#ifdef MS_COREDLL
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extern void *PyWin_DLLhModule;
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#endif
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PyObject *
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PySys_GetObject(name)
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char *name;
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{
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return PyDict_GetItemString(sysdict, name);
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}
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FILE *
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PySys_GetFile(name, def)
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char *name;
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FILE *def;
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{
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FILE *fp = NULL;
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PyObject *v = PySys_GetObject(name);
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if (v != NULL && PyFile_Check(v))
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fp = PyFile_AsFile(v);
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if (fp == NULL)
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fp = def;
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return fp;
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}
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int
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PySys_SetObject(name, v)
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char *name;
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PyObject *v;
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{
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if (v == NULL) {
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if (PyDict_GetItemString(sysdict, name) == NULL)
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return 0;
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else
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return PyDict_DelItemString(sysdict, name);
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}
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else
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return PyDict_SetItemString(sysdict, name, v);
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}
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static PyObject *
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sys_exc_info(self, args)
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PyObject *self;
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PyObject *args;
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{
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PyThreadState *tstate;
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if (!PyArg_Parse(args, ""))
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return NULL;
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tstate = PyThreadState_Get();
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if (tstate == NULL)
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Py_FatalError("sys.exc_info(): no thread state");
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return Py_BuildValue(
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"(OOO)",
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tstate->exc_type != NULL ? tstate->exc_type : Py_None,
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tstate->exc_value != NULL ? tstate->exc_value : Py_None,
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tstate->exc_traceback != NULL ?
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tstate->exc_traceback : Py_None);
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}
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static PyObject *
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sys_exit(self, args)
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PyObject *self;
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PyObject *args;
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{
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/* Raise SystemExit so callers may catch it or clean up. */
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PyErr_SetObject(PyExc_SystemExit, args);
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return NULL;
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}
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static PyObject *
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sys_settrace(self, args)
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PyObject *self;
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PyObject *args;
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{
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PyThreadState *tstate = PyThreadState_Get();
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if (args == Py_None)
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args = NULL;
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else
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Py_XINCREF(args);
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Py_XDECREF(tstate->sys_tracefunc);
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tstate->sys_tracefunc = args;
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Py_INCREF(Py_None);
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return Py_None;
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}
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static PyObject *
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sys_setprofile(self, args)
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PyObject *self;
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PyObject *args;
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{
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PyThreadState *tstate = PyThreadState_Get();
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if (args == Py_None)
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args = NULL;
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else
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Py_XINCREF(args);
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Py_XDECREF(tstate->sys_profilefunc);
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tstate->sys_profilefunc = args;
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Py_INCREF(Py_None);
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return Py_None;
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}
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static PyObject *
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sys_setcheckinterval(self, args)
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PyObject *self;
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PyObject *args;
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{
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PyThreadState *tstate = PyThreadState_Get();
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if (!PyArg_ParseTuple(args, "i", &tstate->sys_checkinterval))
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return NULL;
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Py_INCREF(Py_None);
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return Py_None;
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}
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#ifdef USE_MALLOPT
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/* Link with -lmalloc (or -lmpc) on an SGI */
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#include <malloc.h>
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static PyObject *
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sys_mdebug(self, args)
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PyObject *self;
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PyObject *args;
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{
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int flag;
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if (!PyArg_Parse(args, "i", &flag))
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return NULL;
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mallopt(M_DEBUG, flag);
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Py_INCREF(Py_None);
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return Py_None;
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}
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#endif /* USE_MALLOPT */
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static PyObject *
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sys_getrefcount(self, args)
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PyObject *self;
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PyObject *args;
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{
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PyObject *arg;
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if (!PyArg_Parse(args, "O", &arg))
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return NULL;
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return PyInt_FromLong((long) arg->ob_refcnt);
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}
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#ifdef COUNT_ALLOCS
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static PyObject *
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sys_getcounts(self, args)
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PyObject *self, *args;
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{
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extern PyObject *get_counts Py_PROTO((void));
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if (!PyArg_Parse(args, ""))
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return NULL;
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return get_counts();
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}
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#endif
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#ifdef Py_TRACE_REFS
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/* Defined in objects.c because it uses static globals if that file */
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extern PyObject *_Py_GetObjects Py_PROTO((PyObject *, PyObject *));
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#endif
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#ifdef DYNAMIC_EXECUTION_PROFILE
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/* Defined in ceval.c because it uses static globals if that file */
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extern PyObject *_Py_GetDXProfile Py_PROTO((PyObject *, PyObject *));
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#endif
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static PyMethodDef sys_methods[] = {
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/* Might as well keep this in alphabetic order */
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{"exc_info", sys_exc_info, 0},
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{"exit", sys_exit, 0},
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#ifdef COUNT_ALLOCS
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{"getcounts", sys_getcounts, 0},
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#endif
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#ifdef DYNAMIC_EXECUTION_PROFILE
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{"getdxp", _Py_GetDXProfile, 1},
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#endif
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#ifdef Py_TRACE_REFS
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{"getobjects", _Py_GetObjects, 1},
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#endif
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{"getrefcount", sys_getrefcount, 0},
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#ifdef USE_MALLOPT
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{"mdebug", sys_mdebug, 0},
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#endif
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{"setcheckinterval", sys_setcheckinterval, 1},
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{"setprofile", sys_setprofile, 0},
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{"settrace", sys_settrace, 0},
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{NULL, NULL} /* sentinel */
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};
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static PyObject *sysin, *sysout, *syserr;
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static PyObject *
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list_builtin_module_names()
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{
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PyObject *list = PyList_New(0);
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int i;
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if (list == NULL)
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return NULL;
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for (i = 0; _PyImport_Inittab[i].name != NULL; i++) {
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PyObject *name = PyString_FromString(
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_PyImport_Inittab[i].name);
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if (name == NULL)
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break;
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PyList_Append(list, name);
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Py_DECREF(name);
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}
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if (PyList_Sort(list) != 0) {
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Py_DECREF(list);
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list = NULL;
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}
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if (list) {
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PyObject *v = PyList_AsTuple(list);
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Py_DECREF(list);
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list = v;
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}
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return list;
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}
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void
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PySys_Init()
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{
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extern long PyInt_GetMax Py_PROTO((void));
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extern char *Py_GetVersion Py_PROTO((void));
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extern char *Py_GetCopyright Py_PROTO((void));
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extern char *Py_GetPlatform Py_PROTO((void));
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extern char *Py_GetPrefix Py_PROTO((void));
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extern char *Py_GetExecPrefix Py_PROTO((void));
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extern int fclose Py_PROTO((FILE *));
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PyObject *m = Py_InitModule("sys", sys_methods);
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PyObject *v;
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sysdict = PyModule_GetDict(m);
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Py_INCREF(sysdict);
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/* NB keep an extra ref to the std files to avoid closing them
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when the user deletes them */
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sysin = PyFile_FromFile(stdin, "<stdin>", "r", fclose);
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sysout = PyFile_FromFile(stdout, "<stdout>", "w", fclose);
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syserr = PyFile_FromFile(stderr, "<stderr>", "w", fclose);
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if (PyErr_Occurred())
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Py_FatalError("can't initialize sys.std{in,out,err}");
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PyDict_SetItemString(sysdict, "stdin", sysin);
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PyDict_SetItemString(sysdict, "stdout", sysout);
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PyDict_SetItemString(sysdict, "stderr", syserr);
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PyDict_SetItemString(sysdict, "version",
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v = PyString_FromString(Py_GetVersion()));
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Py_XDECREF(v);
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PyDict_SetItemString(sysdict, "copyright",
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v = PyString_FromString(Py_GetCopyright()));
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Py_XDECREF(v);
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PyDict_SetItemString(sysdict, "platform",
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v = PyString_FromString(Py_GetPlatform()));
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Py_XDECREF(v);
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PyDict_SetItemString(sysdict, "prefix",
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v = PyString_FromString(Py_GetPrefix()));
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Py_XDECREF(v);
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PyDict_SetItemString(sysdict, "exec_prefix",
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v = PyString_FromString(Py_GetExecPrefix()));
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Py_XDECREF(v);
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PyDict_SetItemString(sysdict, "maxint",
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v = PyInt_FromLong(PyInt_GetMax()));
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Py_XDECREF(v);
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PyDict_SetItemString(sysdict, "modules", PyImport_GetModuleDict());
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PyDict_SetItemString(sysdict, "builtin_module_names",
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v = list_builtin_module_names());
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Py_XDECREF(v);
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#ifdef MS_COREDLL
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PyDict_SetItemString(sysdict, "dllhandle",
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v = PyInt_FromLong((int)PyWin_DLLhModule));
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Py_XDECREF(v);
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PyDict_SetItemString(sysdict, "winver",
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v = PyString_FromString(MS_DLL_ID));
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Py_XDECREF(v);
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#endif
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if (PyErr_Occurred())
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Py_FatalError("can't insert sys.* objects in sys dict");
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}
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static PyObject *
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makepathobject(path, delim)
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char *path;
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int delim;
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{
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int i, n;
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char *p;
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PyObject *v, *w;
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n = 1;
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p = path;
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while ((p = strchr(p, delim)) != NULL) {
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n++;
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p++;
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}
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v = PyList_New(n);
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if (v == NULL)
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return NULL;
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for (i = 0; ; i++) {
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p = strchr(path, delim);
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if (p == NULL)
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p = strchr(path, '\0'); /* End of string */
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w = PyString_FromStringAndSize(path, (int) (p - path));
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if (w == NULL) {
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Py_DECREF(v);
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return NULL;
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}
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PyList_SetItem(v, i, w);
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if (*p == '\0')
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break;
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path = p+1;
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}
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return v;
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}
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void
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PySys_SetPath(path)
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char *path;
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{
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PyObject *v;
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if ((v = makepathobject(path, DELIM)) == NULL)
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Py_FatalError("can't create sys.path");
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if (PySys_SetObject("path", v) != 0)
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Py_FatalError("can't assign sys.path");
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Py_DECREF(v);
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}
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static PyObject *
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makeargvobject(argc, argv)
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int argc;
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char **argv;
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{
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PyObject *av;
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if (argc <= 0 || argv == NULL) {
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/* Ensure at least one (empty) argument is seen */
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static char *empty_argv[1] = {""};
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argv = empty_argv;
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argc = 1;
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}
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av = PyList_New(argc);
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if (av != NULL) {
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int i;
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for (i = 0; i < argc; i++) {
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PyObject *v = PyString_FromString(argv[i]);
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if (v == NULL) {
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Py_DECREF(av);
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av = NULL;
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break;
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}
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PyList_SetItem(av, i, v);
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}
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}
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return av;
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}
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void
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PySys_SetArgv(argc, argv)
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int argc;
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char **argv;
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{
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PyObject *av = makeargvobject(argc, argv);
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PyObject *path = PySys_GetObject("path");
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if (av == NULL)
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Py_FatalError("no mem for sys.argv");
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if (PySys_SetObject("argv", av) != 0)
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Py_FatalError("can't assign sys.argv");
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if (path != NULL) {
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char *argv0 = argv[0];
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char *p = NULL;
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int n = 0;
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PyObject *a;
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#ifdef HAVE_READLINK
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char link[MAXPATHLEN+1];
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char argv0copy[2*MAXPATHLEN+1];
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int nr = 0;
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if (argc > 0 && argv0 != NULL)
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nr = readlink(argv0, link, MAXPATHLEN);
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if (nr > 0) {
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/* It's a symlink */
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link[nr] = '\0';
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if (link[0] == SEP)
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argv0 = link; /* Link to absolute path */
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else if (strchr(link, SEP) == NULL)
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; /* Link without path */
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else {
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/* Must join(dirname(argv0), link) */
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char *q = strrchr(argv0, SEP);
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if (q == NULL)
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argv0 = link; /* argv0 without path */
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else {
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/* Must make a copy */
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strcpy(argv0copy, argv0);
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q = strrchr(argv0copy, SEP);
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strcpy(q+1, link);
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argv0 = argv0copy;
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}
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}
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}
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#endif /* HAVE_READLINK */
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#if SEP == '\\' /* Special case for MS filename syntax */
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if (argc > 0 && argv0 != NULL) {
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char *q;
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p = strrchr(argv0, SEP);
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/* Test for alternate separator */
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q = strrchr(p ? p : argv0, '/');
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if (q != NULL)
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p = q;
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if (p != NULL) {
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n = p + 1 - argv0;
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if (n > 1 && p[-1] != ':')
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n--; /* Drop trailing separator */
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}
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}
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#else /* All other filename syntaxes */
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if (argc > 0 && argv0 != NULL)
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p = strrchr(argv0, SEP);
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if (p != NULL) {
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n = p + 1 - argv0;
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#if SEP == '/' /* Special case for Unix filename syntax */
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if (n > 1)
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n--; /* Drop trailing separator */
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#endif /* Unix */
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}
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#endif /* All others */
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a = PyString_FromStringAndSize(argv0, n);
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if (a == NULL)
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Py_FatalError("no mem for sys.path insertion");
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if (PyList_Insert(path, 0, a) < 0)
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Py_FatalError("sys.path.insert(0) failed");
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Py_DECREF(a);
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}
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Py_DECREF(av);
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}
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