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posixmodule.c
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posixmodule.c
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/* POSIX module implementation */
/* This file is also used for Windows NT/MS-Win. In that case the
module actually calls itself 'nt', not 'posix', and a few
functions are either unimplemented or implemented differently. The source
assumes that for Windows NT, the macro 'MS_WINDOWS' is defined independent
of the compiler used. Different compilers define their own feature
test macro, e.g. '_MSC_VER'. */
#define PY_SSIZE_T_CLEAN
#include "Python.h"
#include "pycore_fileutils.h"
#include "pycore_moduleobject.h" // _PyModule_GetState()
#ifdef MS_WINDOWS
/* include <windows.h> early to avoid conflict with pycore_condvar.h:
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
FSCTL_GET_REPARSE_POINT is not exported with WIN32_LEAN_AND_MEAN. */
# include <windows.h>
# include <pathcch.h>
#endif
#ifdef __VXWORKS__
# include "pycore_bitutils.h" // _Py_popcount32()
#endif
#include "pycore_ceval.h" // _PyEval_ReInitThreads()
#include "pycore_import.h" // _PyImport_ReInitLock()
#include "pycore_initconfig.h" // _PyStatus_EXCEPTION()
#include "pycore_pystate.h" // _PyInterpreterState_GET()
#include "structmember.h" // PyMemberDef
#ifndef MS_WINDOWS
# include "posixmodule.h"
#else
# include "winreparse.h"
#endif
/* On android API level 21, 'AT_EACCESS' is not declared although
* HAVE_FACCESSAT is defined. */
#ifdef __ANDROID__
# undef HAVE_FACCESSAT
#endif
#include <stdio.h> /* needed for ctermid() */
/*
* A number of APIs are available on macOS from a certain macOS version.
* To support building with a new SDK while deploying to older versions
* the availability test is split into two:
* - HAVE_<FUNCTION>: The configure check for compile time availability
* - HAVE_<FUNCTION>_RUNTIME: Runtime check for availability
*
* The latter is always true when not on macOS, or when using a compiler
* that does not support __has_builtin (older versions of Xcode).
*
* Due to compiler restrictions there is one valid use of HAVE_<FUNCTION>_RUNTIME:
* if (HAVE_<FUNCTION>_RUNTIME) { ... }
*
* In mixing the test with other tests or using negations will result in compile
* errors.
*/
#if defined(__APPLE__)
#if defined(__has_builtin)
#if __has_builtin(__builtin_available)
#define HAVE_BUILTIN_AVAILABLE 1
#endif
#endif
#ifdef HAVE_BUILTIN_AVAILABLE
# define HAVE_FSTATAT_RUNTIME __builtin_available(macOS 10.10, iOS 8.0, *)
# define HAVE_FACCESSAT_RUNTIME __builtin_available(macOS 10.10, iOS 8.0, *)
# define HAVE_FCHMODAT_RUNTIME __builtin_available(macOS 10.10, iOS 8.0, *)
# define HAVE_FCHOWNAT_RUNTIME __builtin_available(macOS 10.10, iOS 8.0, *)
# define HAVE_LINKAT_RUNTIME __builtin_available(macOS 10.10, iOS 8.0, *)
# define HAVE_FDOPENDIR_RUNTIME __builtin_available(macOS 10.10, iOS 8.0, *)
# define HAVE_MKDIRAT_RUNTIME __builtin_available(macOS 10.10, iOS 8.0, *)
# define HAVE_RENAMEAT_RUNTIME __builtin_available(macOS 10.10, iOS 8.0, *)
# define HAVE_UNLINKAT_RUNTIME __builtin_available(macOS 10.10, iOS 8.0, *)
# define HAVE_OPENAT_RUNTIME __builtin_available(macOS 10.10, iOS 8.0, *)
# define HAVE_READLINKAT_RUNTIME __builtin_available(macOS 10.10, iOS 8.0, *)
# define HAVE_SYMLINKAT_RUNTIME __builtin_available(macOS 10.10, iOS 8.0, *)
# define HAVE_FUTIMENS_RUNTIME __builtin_available(macOS 10.13, iOS 11.0, tvOS 11.0, watchOS 4.0, *)
# define HAVE_UTIMENSAT_RUNTIME __builtin_available(macOS 10.13, iOS 11.0, tvOS 11.0, watchOS 4.0, *)
# define HAVE_PWRITEV_RUNTIME __builtin_available(macOS 11.0, iOS 14.0, tvOS 14.0, watchOS 7.0, *)
# define HAVE_POSIX_SPAWN_SETSID_RUNTIME __builtin_available(macOS 10.15, *)
#else /* Xcode 8 or earlier */
/* __builtin_available is not present in these compilers, but
* some of the symbols might be weak linked (10.10 SDK or later
* deploying on 10.9.
*
* Fall back to the older style of availability checking for
* symbols introduced in macOS 10.10.
*/
# ifdef HAVE_FSTATAT
# define HAVE_FSTATAT_RUNTIME (fstatat != NULL)
# endif
# ifdef HAVE_FACCESSAT
# define HAVE_FACCESSAT_RUNTIME (faccessat != NULL)
# endif
# ifdef HAVE_FCHMODAT
# define HAVE_FCHMODAT_RUNTIME (fchmodat != NULL)
# endif
# ifdef HAVE_FCHOWNAT
# define HAVE_FCHOWNAT_RUNTIME (fchownat != NULL)
# endif
# ifdef HAVE_LINKAT
# define HAVE_LINKAT_RUNTIME (linkat != NULL)
# endif
# ifdef HAVE_FDOPENDIR
# define HAVE_FDOPENDIR_RUNTIME (fdopendir != NULL)
# endif
# ifdef HAVE_MKDIRAT
# define HAVE_MKDIRAT_RUNTIME (mkdirat != NULL)
# endif
# ifdef HAVE_RENAMEAT
# define HAVE_RENAMEAT_RUNTIME (renameat != NULL)
# endif
# ifdef HAVE_UNLINKAT
# define HAVE_UNLINKAT_RUNTIME (unlinkat != NULL)
# endif
# ifdef HAVE_OPENAT
# define HAVE_OPENAT_RUNTIME (openat != NULL)
# endif
# ifdef HAVE_READLINKAT
# define HAVE_READLINKAT_RUNTIME (readlinkat != NULL)
# endif
# ifdef HAVE_SYMLINKAT
# define HAVE_SYMLINKAT_RUNTIME (symlinkat != NULL)
# endif
#endif
#ifdef HAVE_FUTIMESAT
/* Some of the logic for weak linking depends on this assertion */
# error "HAVE_FUTIMESAT unexpectedly defined"
#endif
#else
# define HAVE_FSTATAT_RUNTIME 1
# define HAVE_FACCESSAT_RUNTIME 1
# define HAVE_FCHMODAT_RUNTIME 1
# define HAVE_FCHOWNAT_RUNTIME 1
# define HAVE_LINKAT_RUNTIME 1
# define HAVE_FDOPENDIR_RUNTIME 1
# define HAVE_MKDIRAT_RUNTIME 1
# define HAVE_RENAMEAT_RUNTIME 1
# define HAVE_UNLINKAT_RUNTIME 1
# define HAVE_OPENAT_RUNTIME 1
# define HAVE_READLINKAT_RUNTIME 1
# define HAVE_SYMLINKAT_RUNTIME 1
# define HAVE_FUTIMENS_RUNTIME 1
# define HAVE_UTIMENSAT_RUNTIME 1
# define HAVE_PWRITEV_RUNTIME 1
#endif
#ifdef __cplusplus
extern "C" {
#endif
PyDoc_STRVAR(posix__doc__,
"This module provides access to operating system functionality that is\n\
standardized by the C Standard and the POSIX standard (a thinly\n\
disguised Unix interface). Refer to the library manual and\n\
corresponding Unix manual entries for more information on calls.");
#ifdef HAVE_SYS_UIO_H
# include <sys/uio.h>
#endif
#ifdef HAVE_SYS_SYSMACROS_H
/* GNU C Library: major(), minor(), makedev() */
# include <sys/sysmacros.h>
#endif
#ifdef HAVE_SYS_TYPES_H
# include <sys/types.h>
#endif /* HAVE_SYS_TYPES_H */
#ifdef HAVE_SYS_STAT_H
# include <sys/stat.h>
#endif /* HAVE_SYS_STAT_H */
#ifdef HAVE_SYS_WAIT_H
# include <sys/wait.h> // WNOHANG
#endif
#ifdef HAVE_LINUX_WAIT_H
# include <linux/wait.h> // P_PIDFD
#endif
#ifdef HAVE_SIGNAL_H
# include <signal.h>
#endif
#ifdef HAVE_FCNTL_H
# include <fcntl.h>
#endif
#ifdef HAVE_GRP_H
# include <grp.h>
#endif
#ifdef HAVE_SYSEXITS_H
# include <sysexits.h>
#endif
#ifdef HAVE_SYS_LOADAVG_H
# include <sys/loadavg.h>
#endif
#ifdef HAVE_SYS_SENDFILE_H
# include <sys/sendfile.h>
#endif
#if defined(__APPLE__)
# include <copyfile.h>
#endif
#ifdef HAVE_SCHED_H
# include <sched.h>
#endif
#ifdef HAVE_COPY_FILE_RANGE
# include <unistd.h>
#endif
#if !defined(CPU_ALLOC) && defined(HAVE_SCHED_SETAFFINITY)
# undef HAVE_SCHED_SETAFFINITY
#endif
#if defined(HAVE_SYS_XATTR_H) && defined(__GLIBC__) && !defined(__FreeBSD_kernel__) && !defined(__GNU__)
# define USE_XATTRS
#endif
#ifdef USE_XATTRS
# include <sys/xattr.h>
#endif
#if defined(__FreeBSD__) || defined(__DragonFly__) || defined(__APPLE__)
# ifdef HAVE_SYS_SOCKET_H
# include <sys/socket.h>
# endif
#endif
#ifdef HAVE_DLFCN_H
# include <dlfcn.h>
#endif
#ifdef __hpux
# include <sys/mpctl.h>
#endif
#if defined(__DragonFly__) || \
defined(__OpenBSD__) || \
defined(__FreeBSD__) || \
defined(__NetBSD__) || \
defined(__APPLE__)
# include <sys/sysctl.h>
#endif
#ifdef HAVE_LINUX_RANDOM_H
# include <linux/random.h>
#endif
#ifdef HAVE_GETRANDOM_SYSCALL
# include <sys/syscall.h>
#endif
#if defined(MS_WINDOWS)
# define TERMSIZE_USE_CONIO
#elif defined(HAVE_SYS_IOCTL_H)
# include <sys/ioctl.h>
# if defined(HAVE_TERMIOS_H)
# include <termios.h>
# endif
# if defined(TIOCGWINSZ)
# define TERMSIZE_USE_IOCTL
# endif
#endif /* MS_WINDOWS */
/* Various compilers have only certain posix functions */
/* XXX Gosh I wish these were all moved into pyconfig.h */
#if defined(__WATCOMC__) && !defined(__QNX__) /* Watcom compiler */
# define HAVE_OPENDIR 1
# define HAVE_SYSTEM 1
# include <process.h>
#else
# ifdef _MSC_VER
/* Microsoft compiler */
# define HAVE_GETPPID 1
# define HAVE_GETLOGIN 1
# define HAVE_SPAWNV 1
# define HAVE_EXECV 1
# define HAVE_WSPAWNV 1
# define HAVE_WEXECV 1
# define HAVE_PIPE 1
# define HAVE_SYSTEM 1
# define HAVE_CWAIT 1
# define HAVE_FSYNC 1
# define fsync _commit
# else
/* Unix functions that the configure script doesn't check for */
# ifndef __VXWORKS__
# define HAVE_EXECV 1
# define HAVE_FORK 1
# if defined(__USLC__) && defined(__SCO_VERSION__) /* SCO UDK Compiler */
# define HAVE_FORK1 1
# endif
# endif
# define HAVE_GETEGID 1
# define HAVE_GETEUID 1
# define HAVE_GETGID 1
# define HAVE_GETPPID 1
# define HAVE_GETUID 1
# define HAVE_KILL 1
# define HAVE_OPENDIR 1
# define HAVE_PIPE 1
# define HAVE_SYSTEM 1
# define HAVE_WAIT 1
# define HAVE_TTYNAME 1
# endif /* _MSC_VER */
#endif /* ! __WATCOMC__ || __QNX__ */
_Py_IDENTIFIER(__fspath__);
/*[clinic input]
# one of the few times we lie about this name!
module os
[clinic start generated code]*/
/*[clinic end generated code: output=da39a3ee5e6b4b0d input=94a0f0f978acae17]*/
#ifndef _MSC_VER
#if defined(__sgi)&&_COMPILER_VERSION>=700
/* declare ctermid_r if compiling with MIPSPro 7.x in ANSI C mode
(default) */
extern char *ctermid_r(char *);
#endif
#endif /* !_MSC_VER */
#if defined(__VXWORKS__)
# include <vxCpuLib.h>
# include <rtpLib.h>
# include <wait.h>
# include <taskLib.h>
# ifndef _P_WAIT
# define _P_WAIT 0
# define _P_NOWAIT 1
# define _P_NOWAITO 1
# endif
#endif /* __VXWORKS__ */
#ifdef HAVE_POSIX_SPAWN
# include <spawn.h>
#endif
#ifdef HAVE_UTIME_H
# include <utime.h>
#endif /* HAVE_UTIME_H */
#ifdef HAVE_SYS_UTIME_H
# include <sys/utime.h>
# define HAVE_UTIME_H /* pretend we do for the rest of this file */
#endif /* HAVE_SYS_UTIME_H */
#ifdef HAVE_SYS_TIMES_H
# include <sys/times.h>
#endif /* HAVE_SYS_TIMES_H */
#ifdef HAVE_SYS_PARAM_H
# include <sys/param.h>
#endif /* HAVE_SYS_PARAM_H */
#ifdef HAVE_SYS_UTSNAME_H
# include <sys/utsname.h>
#endif /* HAVE_SYS_UTSNAME_H */
#ifdef HAVE_DIRENT_H
# include <dirent.h>
# define NAMLEN(dirent) strlen((dirent)->d_name)
#else
# if defined(__WATCOMC__) && !defined(__QNX__)
# include <direct.h>
# define NAMLEN(dirent) strlen((dirent)->d_name)
# else
# define dirent direct
# define NAMLEN(dirent) (dirent)->d_namlen
# endif
# ifdef HAVE_SYS_NDIR_H
# include <sys/ndir.h>
# endif
# ifdef HAVE_SYS_DIR_H
# include <sys/dir.h>
# endif
# ifdef HAVE_NDIR_H
# include <ndir.h>
# endif
#endif
#ifdef _MSC_VER
# ifdef HAVE_DIRECT_H
# include <direct.h>
# endif
# ifdef HAVE_IO_H
# include <io.h>
# endif
# ifdef HAVE_PROCESS_H
# include <process.h>
# endif
# ifndef IO_REPARSE_TAG_SYMLINK
# define IO_REPARSE_TAG_SYMLINK (0xA000000CL)
# endif
# ifndef IO_REPARSE_TAG_MOUNT_POINT
# define IO_REPARSE_TAG_MOUNT_POINT (0xA0000003L)
# endif
# include "osdefs.h" // SEP
# include <malloc.h>
# include <windows.h>
# include <shellapi.h> // ShellExecute()
# include <lmcons.h> // UNLEN
# define HAVE_SYMLINK
#endif /* _MSC_VER */
#ifndef MAXPATHLEN
# if defined(PATH_MAX) && PATH_MAX > 1024
# define MAXPATHLEN PATH_MAX
# else
# define MAXPATHLEN 1024
# endif
#endif /* MAXPATHLEN */
#ifdef UNION_WAIT
/* Emulate some macros on systems that have a union instead of macros */
# ifndef WIFEXITED
# define WIFEXITED(u_wait) (!(u_wait).w_termsig && !(u_wait).w_coredump)
# endif
# ifndef WEXITSTATUS
# define WEXITSTATUS(u_wait) (WIFEXITED(u_wait)?((u_wait).w_retcode):-1)
# endif
# ifndef WTERMSIG
# define WTERMSIG(u_wait) ((u_wait).w_termsig)
# endif
# define WAIT_TYPE union wait
# define WAIT_STATUS_INT(s) (s.w_status)
#else
/* !UNION_WAIT */
# define WAIT_TYPE int
# define WAIT_STATUS_INT(s) (s)
#endif /* UNION_WAIT */
/* Don't use the "_r" form if we don't need it (also, won't have a
prototype for it, at least on Solaris -- maybe others as well?). */
#if defined(HAVE_CTERMID_R)
# define USE_CTERMID_R
#endif
/* choose the appropriate stat and fstat functions and return structs */
#undef STAT
#undef FSTAT
#undef STRUCT_STAT
#ifdef MS_WINDOWS
# define STAT win32_stat
# define LSTAT win32_lstat
# define FSTAT _Py_fstat_noraise
# define STRUCT_STAT struct _Py_stat_struct
#else
# define STAT stat
# define LSTAT lstat
# define FSTAT fstat
# define STRUCT_STAT struct stat
#endif
#if defined(MAJOR_IN_MKDEV)
# include <sys/mkdev.h>
#else
# if defined(MAJOR_IN_SYSMACROS)
# include <sys/sysmacros.h>
# endif
# if defined(HAVE_MKNOD) && defined(HAVE_SYS_MKDEV_H)
# include <sys/mkdev.h>
# endif
#endif
#ifdef MS_WINDOWS
# define INITFUNC PyInit_nt
# define MODNAME "nt"
#else
# define INITFUNC PyInit_posix
# define MODNAME "posix"
#endif
#if defined(__sun)
/* Something to implement in autoconf, not present in autoconf 2.69 */
# define HAVE_STRUCT_STAT_ST_FSTYPE 1
#endif
/* memfd_create is either defined in sys/mman.h or sys/memfd.h
* linux/memfd.h defines additional flags
*/
#ifdef HAVE_SYS_MMAN_H
# include <sys/mman.h>
#endif
#ifdef HAVE_SYS_MEMFD_H
# include <sys/memfd.h>
#endif
#ifdef HAVE_LINUX_MEMFD_H
# include <linux/memfd.h>
#endif
/* eventfd() */
#ifdef HAVE_SYS_EVENTFD_H
# include <sys/eventfd.h>
#endif
#ifdef _Py_MEMORY_SANITIZER
# include <sanitizer/msan_interface.h>
#endif
#ifdef HAVE_FORK
static void
run_at_forkers(PyObject *lst, int reverse)
{
Py_ssize_t i;
PyObject *cpy;
if (lst != NULL) {
assert(PyList_CheckExact(lst));
/* Use a list copy in case register_at_fork() is called from
* one of the callbacks.
*/
cpy = PyList_GetSlice(lst, 0, PyList_GET_SIZE(lst));
if (cpy == NULL)
PyErr_WriteUnraisable(lst);
else {
if (reverse)
PyList_Reverse(cpy);
for (i = 0; i < PyList_GET_SIZE(cpy); i++) {
PyObject *func, *res;
func = PyList_GET_ITEM(cpy, i);
res = _PyObject_CallNoArg(func);
if (res == NULL)
PyErr_WriteUnraisable(func);
else
Py_DECREF(res);
}
Py_DECREF(cpy);
}
}
}
void
PyOS_BeforeFork(void)
{
run_at_forkers(_PyInterpreterState_GET()->before_forkers, 1);
_PyImport_AcquireLock();
}
void
PyOS_AfterFork_Parent(void)
{
if (_PyImport_ReleaseLock() <= 0)
Py_FatalError("failed releasing import lock after fork");
run_at_forkers(_PyInterpreterState_GET()->after_forkers_parent, 0);
}
void
PyOS_AfterFork_Child(void)
{
PyStatus status;
_PyRuntimeState *runtime = &_PyRuntime;
status = _PyGILState_Reinit(runtime);
if (_PyStatus_EXCEPTION(status)) {
goto fatal_error;
}
PyThreadState *tstate = _PyThreadState_GET();
_Py_EnsureTstateNotNULL(tstate);
status = _PyEval_ReInitThreads(tstate);
if (_PyStatus_EXCEPTION(status)) {
goto fatal_error;
}
status = _PyImport_ReInitLock();
if (_PyStatus_EXCEPTION(status)) {
goto fatal_error;
}
_PySignal_AfterFork();
status = _PyRuntimeState_ReInitThreads(runtime);
if (_PyStatus_EXCEPTION(status)) {
goto fatal_error;
}
status = _PyInterpreterState_DeleteExceptMain(runtime);
if (_PyStatus_EXCEPTION(status)) {
goto fatal_error;
}
assert(_PyThreadState_GET() == tstate);
run_at_forkers(tstate->interp->after_forkers_child, 0);
return;
fatal_error:
Py_ExitStatusException(status);
}
static int
register_at_forker(PyObject **lst, PyObject *func)
{
if (func == NULL) /* nothing to register? do nothing. */
return 0;
if (*lst == NULL) {
*lst = PyList_New(0);
if (*lst == NULL)
return -1;
}
return PyList_Append(*lst, func);
}
#endif /* HAVE_FORK */
/* Legacy wrapper */
void
PyOS_AfterFork(void)
{
#ifdef HAVE_FORK
PyOS_AfterFork_Child();
#endif
}
#ifdef MS_WINDOWS
/* defined in fileutils.c */
void _Py_time_t_to_FILE_TIME(time_t, int, FILETIME *);
void _Py_attribute_data_to_stat(BY_HANDLE_FILE_INFORMATION *,
ULONG, struct _Py_stat_struct *);
#endif
#ifndef MS_WINDOWS
PyObject *
_PyLong_FromUid(uid_t uid)
{
if (uid == (uid_t)-1)
return PyLong_FromLong(-1);
return PyLong_FromUnsignedLong(uid);
}
PyObject *
_PyLong_FromGid(gid_t gid)
{
if (gid == (gid_t)-1)
return PyLong_FromLong(-1);
return PyLong_FromUnsignedLong(gid);
}
int
_Py_Uid_Converter(PyObject *obj, uid_t *p)
{
uid_t uid;
PyObject *index;
int overflow;
long result;
unsigned long uresult;
index = _PyNumber_Index(obj);
if (index == NULL) {
PyErr_Format(PyExc_TypeError,
"uid should be integer, not %.200s",
_PyType_Name(Py_TYPE(obj)));
return 0;
}
/*
* Handling uid_t is complicated for two reasons:
* * Although uid_t is (always?) unsigned, it still
* accepts -1.
* * We don't know its size in advance--it may be
* bigger than an int, or it may be smaller than
* a long.
*
* So a bit of defensive programming is in order.
* Start with interpreting the value passed
* in as a signed long and see if it works.
*/
result = PyLong_AsLongAndOverflow(index, &overflow);
if (!overflow) {
uid = (uid_t)result;
if (result == -1) {
if (PyErr_Occurred())
goto fail;
/* It's a legitimate -1, we're done. */
goto success;
}
/* Any other negative number is disallowed. */
if (result < 0)
goto underflow;
/* Ensure the value wasn't truncated. */
if (sizeof(uid_t) < sizeof(long) &&
(long)uid != result)
goto underflow;
goto success;
}
if (overflow < 0)
goto underflow;
/*
* Okay, the value overflowed a signed long. If it
* fits in an *unsigned* long, it may still be okay,
* as uid_t may be unsigned long on this platform.
*/
uresult = PyLong_AsUnsignedLong(index);
if (PyErr_Occurred()) {
if (PyErr_ExceptionMatches(PyExc_OverflowError))
goto overflow;
goto fail;
}
uid = (uid_t)uresult;
/*
* If uid == (uid_t)-1, the user actually passed in ULONG_MAX,
* but this value would get interpreted as (uid_t)-1 by chown
* and its siblings. That's not what the user meant! So we
* throw an overflow exception instead. (We already
* handled a real -1 with PyLong_AsLongAndOverflow() above.)
*/
if (uid == (uid_t)-1)
goto overflow;
/* Ensure the value wasn't truncated. */
if (sizeof(uid_t) < sizeof(long) &&
(unsigned long)uid != uresult)
goto overflow;
/* fallthrough */
success:
Py_DECREF(index);
*p = uid;
return 1;
underflow:
PyErr_SetString(PyExc_OverflowError,
"uid is less than minimum");
goto fail;
overflow:
PyErr_SetString(PyExc_OverflowError,
"uid is greater than maximum");
/* fallthrough */
fail:
Py_DECREF(index);
return 0;
}
int
_Py_Gid_Converter(PyObject *obj, gid_t *p)
{
gid_t gid;
PyObject *index;
int overflow;
long result;
unsigned long uresult;
index = _PyNumber_Index(obj);
if (index == NULL) {
PyErr_Format(PyExc_TypeError,
"gid should be integer, not %.200s",
_PyType_Name(Py_TYPE(obj)));
return 0;
}
/*
* Handling gid_t is complicated for two reasons:
* * Although gid_t is (always?) unsigned, it still
* accepts -1.
* * We don't know its size in advance--it may be
* bigger than an int, or it may be smaller than
* a long.
*
* So a bit of defensive programming is in order.
* Start with interpreting the value passed
* in as a signed long and see if it works.
*/
result = PyLong_AsLongAndOverflow(index, &overflow);
if (!overflow) {
gid = (gid_t)result;
if (result == -1) {
if (PyErr_Occurred())
goto fail;
/* It's a legitimate -1, we're done. */
goto success;
}
/* Any other negative number is disallowed. */
if (result < 0) {
goto underflow;
}
/* Ensure the value wasn't truncated. */
if (sizeof(gid_t) < sizeof(long) &&
(long)gid != result)
goto underflow;
goto success;
}
if (overflow < 0)
goto underflow;
/*
* Okay, the value overflowed a signed long. If it
* fits in an *unsigned* long, it may still be okay,
* as gid_t may be unsigned long on this platform.
*/
uresult = PyLong_AsUnsignedLong(index);
if (PyErr_Occurred()) {
if (PyErr_ExceptionMatches(PyExc_OverflowError))
goto overflow;
goto fail;
}
gid = (gid_t)uresult;
/*
* If gid == (gid_t)-1, the user actually passed in ULONG_MAX,
* but this value would get interpreted as (gid_t)-1 by chown
* and its siblings. That's not what the user meant! So we
* throw an overflow exception instead. (We already
* handled a real -1 with PyLong_AsLongAndOverflow() above.)
*/
if (gid == (gid_t)-1)
goto overflow;
/* Ensure the value wasn't truncated. */
if (sizeof(gid_t) < sizeof(long) &&
(unsigned long)gid != uresult)
goto overflow;
/* fallthrough */
success:
Py_DECREF(index);
*p = gid;
return 1;
underflow:
PyErr_SetString(PyExc_OverflowError,
"gid is less than minimum");
goto fail;
overflow:
PyErr_SetString(PyExc_OverflowError,
"gid is greater than maximum");
/* fallthrough */
fail:
Py_DECREF(index);
return 0;
}
#endif /* MS_WINDOWS */
#define _PyLong_FromDev PyLong_FromLongLong
#if defined(HAVE_MKNOD) && defined(HAVE_MAKEDEV)
static int
_Py_Dev_Converter(PyObject *obj, void *p)
{
*((dev_t *)p) = PyLong_AsUnsignedLongLong(obj);
if (PyErr_Occurred())
return 0;
return 1;
}
#endif /* HAVE_MKNOD && HAVE_MAKEDEV */
#ifdef AT_FDCWD
/*
* Why the (int) cast? Solaris 10 defines AT_FDCWD as 0xffd19553 (-3041965);
* without the int cast, the value gets interpreted as uint (4291925331),
* which doesn't play nicely with all the initializer lines in this file that
* look like this:
* int dir_fd = DEFAULT_DIR_FD;
*/
#define DEFAULT_DIR_FD (int)AT_FDCWD
#else
#define DEFAULT_DIR_FD (-100)
#endif
static int
_fd_converter(PyObject *o, int *p)
{
int overflow;
long long_value;
PyObject *index = _PyNumber_Index(o);
if (index == NULL) {
return 0;
}
assert(PyLong_Check(index));
long_value = PyLong_AsLongAndOverflow(index, &overflow);
Py_DECREF(index);
assert(!PyErr_Occurred());
if (overflow > 0 || long_value > INT_MAX) {
PyErr_SetString(PyExc_OverflowError,
"fd is greater than maximum");
return 0;
}
if (overflow < 0 || long_value < INT_MIN) {
PyErr_SetString(PyExc_OverflowError,
"fd is less than minimum");
return 0;
}
*p = (int)long_value;
return 1;
}
static int
dir_fd_converter(PyObject *o, void *p)
{
if (o == Py_None) {
*(int *)p = DEFAULT_DIR_FD;
return 1;
}
else if (PyIndex_Check(o)) {
return _fd_converter(o, (int *)p);
}
else {
PyErr_Format(PyExc_TypeError,
"argument should be integer or None, not %.200s",
_PyType_Name(Py_TYPE(o)));
return 0;
}
}
typedef struct {
PyObject *billion;
PyObject *DirEntryType;
PyObject *ScandirIteratorType;
#if defined(HAVE_SCHED_SETPARAM) || defined(HAVE_SCHED_SETSCHEDULER) || defined(POSIX_SPAWN_SETSCHEDULER) || defined(POSIX_SPAWN_SETSCHEDPARAM)
PyObject *SchedParamType;
#endif
PyObject *StatResultType;
PyObject *StatVFSResultType;
PyObject *TerminalSizeType;
PyObject *TimesResultType;
PyObject *UnameResultType;
#if defined(HAVE_WAITID) && !defined(__APPLE__)
PyObject *WaitidResultType;
#endif
#if defined(HAVE_WAIT3) || defined(HAVE_WAIT4)
PyObject *struct_rusage;
#endif
PyObject *st_mode;
} _posixstate;
static inline _posixstate*
get_posix_state(PyObject *module)
{
void *state = _PyModule_GetState(module);
assert(state != NULL);
return (_posixstate *)state;