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bpo-31368: Expose preadv (preadv2) and pwritev (pwritev2) in the os module #5239

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Merged
vstinner merged 14 commits into from
Jan 27, 2018
Merged

bpo-31368: Expose preadv (preadv2) and pwritev (pwritev2) in the os module #5239

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ea21128
Expose preadv2 in os module
pablogsal Jan 19, 2018
4570976
Add News entry
pablogsal Jan 19, 2018
21a3004
Add correct guards for the presence of preadv2
pablogsal Jan 19, 2018
8a2a2a3
Implement check for individual constants
pablogsal Jan 19, 2018
c0c53dc
Implemented preadv and join implementation to preadv2
pablogsal Jan 19, 2018
4ddbca9
Clean iov on error
pablogsal Jan 20, 2018
cac62ac
Add documentation in the os module
pablogsal Jan 22, 2018
c7b7285
Add information about the rest of the parameters
pablogsal Jan 22, 2018
58910d0
Expose pwritev and pwritev2 in os module
pablogsal Jan 23, 2018
f7cdf22
Fix style issues and Docs
pablogsal Jan 23, 2018
47f65b5
Correct style, update docs, fix misused API
pablogsal Jan 23, 2018
87c6970
Improve tests, clean names and correct style
pablogsal Jan 26, 2018
cb74d38
Correct documentation
pablogsal Jan 26, 2018
5563b8d
Correct typos, docstring and improve Docs
pablogsal Jan 27, 2018
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26 changes: 26 additions & 0 deletions Doc/library/os.rst
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Expand Up @@ -1195,6 +1195,32 @@ or `the MSDN <https://msdn.microsoft.com/en-us/library/z0kc8e3z.aspx>`_ on Windo
.. versionadded:: 3.3


.. function:: preadv(fd, buffers, offset, flags = None)

@csabella csabella Jan 22, 2018 •
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I don't know the answer to this, but should it be flags=None with no spaces?

Actually, I just realized this is implemented in C. I can't really comment on that code, but you have it as flags=0 in the C module. Is None and 0 the same thing?

@pablogsal pablogsal Jan 22, 2018 •
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You are right. The None was because a previous declaration before switching to the default suggested by @njsmith. It should be flags=0. Corrected in c7b7285.


Combines the functionality of :func:`os.readv` and :func:`os.pread`. It

@csabella csabella Jan 22, 2018

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I noticed you didn't duplicate the definition of fd and buffers from readv. I think most of docs explain all the parms, even if they are duplicated from another section.

@pablogsal pablogsal Jan 22, 2018 •
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I has hessitant to duplicate because readv is the function described inmediately before this one but I suppose that consistency makes sense. Thanks.

Corrected in c7b7285

performs the same task as :func:`os.readv`, but adds a fourth argument,
offset, which specifies the file offset at which the input operation is

@csabella csabella Jan 22, 2018

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You put asterisks around flags below and I think the first offset should have the name because this is referring to the argument.

@pablogsal pablogsal Jan 22, 2018 •
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Corrected in c7b7285

to be performed.

If the *flags* argument is provided it will invoke the *preadv2* system
call, which modifies the behavior on a per-call basis based on the value
of the *flags* argument. If this argument is ommited, the *preadv* system
call will be called instead.

The flags argument contains a bitwise OR of zero or more of the following
flags:

.. data:: RWF_HIPRI
RWF_NOWAIT

@vstinner vstinner Jan 27, 2018

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Hum, I suggest to have one ".. data" entry per constant and copy the documentation from the manual page. Extract of Fedora 27 manual pages:

       RWF_DSYNC (since Linux 4.7)
              Provide  a  per-write  equivalent  of  the O_DSYNC open(2) flag.
              This flag is meaningful only  for  pwritev2(),  and  its  effect
              applies only to the data range written by the system call.

       RWF_HIPRI (since Linux 4.6)
              High priority read/write.  Allows block-based filesystems to use
              polling of the device, which provides lower latency, but may use
              additional  resources.   (Currently, this feature is usable only
              on a file descriptor opened using the O_DIRECT flag.)

       RWF_SYNC (since Linux 4.7)
              Provide a per-write equivalent of the O_SYNC open(2) flag.  This
              flag  is  meaningful only for pwritev2(), and its effect applies
              only to the data range written by the system call.

It would become simpler to describe the availability.


The above constants are available on Linux Kernel 4.11 and 4.6 (or newer)
respectively.

Availability: Unix.

.. versionadded:: 3.7


.. function:: tcgetpgrp(fd)

Return the process group associated with the terminal given by *fd* (an open
Expand Down
24 changes: 24 additions & 0 deletions Lib/test/test_posix.py
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Expand Up @@ -272,6 +272,30 @@ def test_pread(self):
finally:
os.close(fd)

@unittest.skipUnless(hasattr(posix, 'preadv'), "test needs posix.preadv()")
def test_preadv(self):
fd = os.open(support.TESTFN, os.O_RDWR | os.O_CREAT)
try:
os.write(fd, b'test1tt2t3')

@vstinner vstinner Jan 26, 2018

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please write more than 10 bytes, to make sure that preadv2() doesn't read more than expected.

os.lseek(fd, 0, os.SEEK_SET)

@vstinner vstinner Jan 26, 2018

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Hum, is it really needed to seek back at offset 0? It would be more interesting to test preadv() with an offset different than the current offset.

buf = [bytearray(i) for i in [5, 3, 2]]
self.assertEqual(posix.preadv(fd, buf, 0), 10)
self.assertEqual([b'test1', b'tt2', b't3'], [bytes(i) for i in buf])

@vstinner vstinner Jan 26, 2018

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I'm not sure that bytes() cast is needed here. Just write list(buf) for the second argument?

finally:
os.close(fd)

@unittest.skipUnless(hasattr(posix, 'RWF_SYNC'), "test needs posix.preadv2()")
def test_preadv2(self):
fd = os.open(support.TESTFN, os.O_RDWR | os.O_CREAT)
try:
os.write(fd, b'test1tt2t3')
os.lseek(fd, 0, os.SEEK_SET)
buf = [bytearray(i) for i in [5, 3, 2]]
self.assertEqual(posix.preadv(fd, buf, 0, os.RWF_SYNC), 10)
self.assertEqual([b'test1', b'tt2', b't3'], [bytes(i) for i in buf])
finally:
os.close(fd)

@unittest.skipUnless(hasattr(posix, 'pwrite'), "test needs posix.pwrite()")
def test_pwrite(self):
fd = os.open(support.TESTFN, os.O_RDWR | os.O_CREAT)
Expand Down
1 change: 1 addition & 0 deletions Misc/NEWS.d/next/Core and Builtins/2018-01-19-01-54-22.bpo-31368.kzKqUR.rst
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@@ -0,0 +1 @@
Expose preadv2 system call in the os module. Patch by Pablo Galindo
50 changes: 49 additions & 1 deletion Modules/clinic/posixmodule.c.h
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Expand Up @@ -3705,6 +3705,50 @@ os_pread(PyObject *module, PyObject *const *args, Py_ssize_t nargs)

#endif /* defined(HAVE_PREAD) */

#if (defined(HAVE_PREADV) || defined (HAVE_PREADV2))

PyDoc_STRVAR(os_preadv__doc__,
"preadv($module, fd, buffers, offset, flags=0, /)\n"
"--\n"
"\n"
"Read a number of bytes from a file descriptor starting at a particular offset.\n"
"\n"
"Read length bytes from file descriptor fd, starting at offset bytes from\n"
"the beginning of the file. The file offset remains unchanged.");

#define OS_PREADV_METHODDEF \
{"preadv", (PyCFunction)os_preadv, METH_FASTCALL, os_preadv__doc__},

static Py_ssize_t
os_preadv_impl(PyObject *module, int fd, PyObject *buffers, Py_off_t offset,
int flags);

static PyObject *
os_preadv(PyObject *module, PyObject *const *args, Py_ssize_t nargs)
{
PyObject *return_value = NULL;
int fd;
PyObject *buffers;
Py_off_t offset;
int flags = 0;
Py_ssize_t _return_value;

if (!_PyArg_ParseStack(args, nargs, "iOO&|i:preadv",
&fd, &buffers, Py_off_t_converter, &offset, &flags)) {
goto exit;
}
_return_value = os_preadv_impl(module, fd, buffers, offset, flags);
if ((_return_value == -1) && PyErr_Occurred()) {
goto exit;
}
return_value = PyLong_FromSsize_t(_return_value);

exit:
return return_value;
}

#endif /* (defined(HAVE_PREADV) || defined (HAVE_PREADV2)) */

PyDoc_STRVAR(os_write__doc__,
"write($module, fd, data, /)\n"
"--\n"
Expand Down Expand Up @@ -6239,6 +6283,10 @@ os_getrandom(PyObject *module, PyObject *const *args, Py_ssize_t nargs, PyObject
#define OS_PREAD_METHODDEF
#endif /* !defined(OS_PREAD_METHODDEF) */

#ifndef OS_PREADV_METHODDEF
#define OS_PREADV_METHODDEF
#endif /* !defined(OS_PREADV_METHODDEF) */

#ifndef OS_PIPE_METHODDEF
#define OS_PIPE_METHODDEF
#endif /* !defined(OS_PIPE_METHODDEF) */
Expand Down Expand Up @@ -6410,4 +6458,4 @@ os_getrandom(PyObject *module, PyObject *const *args, Py_ssize_t nargs, PyObject
#ifndef OS_GETRANDOM_METHODDEF
#define OS_GETRANDOM_METHODDEF
#endif /* !defined(OS_GETRANDOM_METHODDEF) */
/*[clinic end generated code: output=6345053cd5992caf input=a9049054013a1b77]*/
/*[clinic end generated code: output=52cbdec1822e34f9 input=a9049054013a1b77]*/
82 changes: 82 additions & 0 deletions Modules/posixmodule.c
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Original file line number Diff line number Diff line change
Expand Up @@ -8163,6 +8163,74 @@ os_pread_impl(PyObject *module, int fd, int length, Py_off_t offset)
}
#endif /* HAVE_PREAD */

#if defined(HAVE_PREADV) || defined (HAVE_PREADV2)
/*[clinic input]
os.preadv -> Py_ssize_t

fd: int
buffers: object
offset: Py_off_t
flags: int = 0
/

Read a number of bytes from a file descriptor starting at a particular offset.

Read length bytes from file descriptor fd, starting at offset bytes from
the beginning of the file. The file offset remains unchanged.

@vstinner vstinner Jan 27, 2018

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Wait... is this description correct? it seems to be copied from two other functions?

[clinic start generated code]*/

static Py_ssize_t
os_preadv_impl(PyObject *module, int fd, PyObject *buffers, Py_off_t offset,
int flags)
/*[clinic end generated code: output=26fc9c6e58e7ada5 input=5b07b7e2d1825627]*/
{
Py_ssize_t cnt, n;
int async_err = 0;
struct iovec *iov;
Py_buffer *buf;

if (!PySequence_Check(buffers)) {
PyErr_SetString(PyExc_TypeError,
"preadv2() arg 2 must be a sequence");
return -1;
}

cnt = PySequence_Size(buffers);
if (cnt < 0)

@vstinner vstinner Jan 23, 2018

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Please always add { ... } to if blocks: see PEP 7. Same comment for the whole PR.

return -1;

if (iov_setup(&iov, &buf, buffers, cnt, PyBUF_WRITABLE) < 0)
return -1;
#ifdef HAVE_PREADV2
do {
Py_BEGIN_ALLOW_THREADS
n = preadv2(fd, iov, cnt, offset, flags);
Py_END_ALLOW_THREADS
} while (n < 0 && errno == EINTR && !(async_err = PyErr_CheckSignals()));

@vstinner vstinner Jan 23, 2018

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Do you know if it's safe to call preadv2() again if it fals with EINTR?

@pablogsal pablogsal Jan 23, 2018 •
edited
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I am not completely sure. I assumed that it is the case because is implemented internally using preadv and pread and those aresafe to retry but I cannot point to some place that definitely corroborates this. What should we do?

@vstinner vstinner Jan 23, 2018

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Don't worry. It's not really our issue for make sure that preadv()/preadv2() can be called again with same arguments on EINTR. The kernel and libc must make that doable and safe.

@njsmith njsmith Jan 23, 2018

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Isn't that how literally every syscall except close defines EINTR? Also preadv2 doesn't even have any observable side-effects, it seems like pwritev2 is the one you should worry about if you're going to worry :-). (But if pwritev2 manages to only write some of the bytes and then gets interrupted by a signal, then it should report a successful partial write, not EINTR, the same way write etc. work.)

#else
if(flags != 0){
PyErr_SetString(PyExc_OSError, "preadv2() not available in this system");

@vstinner vstinner Jan 23, 2018

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PyExc_NotImplementedError is preferred on such case: maybe reuse argument_unavailable_error()?

iov_cleanup(iov, buf, cnt);

@vstinner vstinner Jan 23, 2018

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Can you please this if(flags) before iov_setup() to not have to cleanup iov? Use #ifndef HAVE_PREADV2.

return -1;
}
do {
Py_BEGIN_ALLOW_THREADS
n = preadv(fd, iov, cnt, offset);
Py_END_ALLOW_THREADS
} while (n < 0 && errno == EINTR && !(async_err = PyErr_CheckSignals()));
#endif

iov_cleanup(iov, buf, cnt);

@njsmith njsmith Jan 20, 2018

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If we exit early (e.g. due to flags != 0), then this cleanup function doesn't get called. Is that OK?

@pablogsal pablogsal Jan 20, 2018

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I have corrected it in 4ddbca9. I could not use easily a goto label to have a clean exit section due to the check for async error in the signal handler so I just clean before exiting if flags != 0.

if (n < 0) {
if (!async_err)

@vstinner vstinner Jan 26, 2018

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PEP 7 coding style: add { ... }

posix_error();
return -1;
}

return n;
}
#endif /* HAVE_PREADV */


/*[clinic input]
os.write -> Py_ssize_t
Expand Down Expand Up @@ -12506,6 +12574,7 @@ static PyMethodDef posix_methods[] = {
OS_READ_METHODDEF
OS_READV_METHODDEF
OS_PREAD_METHODDEF
OS_PREADV_METHODDEF
OS_WRITE_METHODDEF
OS_WRITEV_METHODDEF
OS_PWRITE_METHODDEF
Expand Down Expand Up @@ -12953,6 +13022,19 @@ all_ins(PyObject *m)
if (PyModule_AddIntMacro(m, F_TEST)) return -1;
#endif

#ifdef RWF_DSYNC
if (PyModule_AddIntConstant(m, "RWF_DSYNC", RWF_DSYNC)) return -1;
#endif
#ifdef RWF_HIPRI
if (PyModule_AddIntConstant(m, "RWF_HIPRI", RWF_HIPRI)) return -1;
#endif
#ifdef RWF_SYNC
if (PyModule_AddIntConstant(m, "RWF_SYNC", RWF_SYNC)) return -1;
#endif
#ifdef RWF_NOWAIT
if (PyModule_AddIntConstant(m, "RWF_NOWAIT", RWF_NOWAIT)) return -1;
#endif

@njsmith njsmith Jan 19, 2018

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These constants were added at different times, so they should be checked for individually, like:

#ifdef RWF_DSYNC
    if (PyModule_AddIntConstant(m, "RWF_DSYNC", RWF_DSYNC)) return -1;
#endif
#ifdef RWF_HIPRI
    if (PyModule_AddIntConstant(m, "RWF_HIPRI", RWF_HIPRI)) return -1;
#endif
...

@YoSTEALTH YoSTEALTH Jan 19, 2018

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Also EOPNOTSUPP flag might be important to add?

@njsmith njsmith Jan 19, 2018

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That's already available as errno.EOPNOTSUPP.


#ifdef HAVE_SPAWNV
if (PyModule_AddIntConstant(m, "P_WAIT", _P_WAIT)) return -1;
if (PyModule_AddIntConstant(m, "P_NOWAIT", _P_NOWAIT)) return -1;
Expand Down
80 changes: 6 additions & 74 deletions aclocal.m4
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Original file line number Diff line number Diff line change
Expand Up @@ -13,7 +13,7 @@

m4_ifndef([AC_CONFIG_MACRO_DIRS], [m4_defun([_AM_CONFIG_MACRO_DIRS], [])m4_defun([AC_CONFIG_MACRO_DIRS], [_AM_CONFIG_MACRO_DIRS($@)])])
# pkg.m4 - Macros to locate and utilise pkg-config. -*- Autoconf -*-
# serial 11 (pkg-config-0.29.1)
# serial 12 (pkg-config-0.29.2)

dnl Copyright © 2004 Scott James Remnant <scott@netsplit.com>.
dnl Copyright © 2012-2015 Dan Nicholson <dbn.lists@gmail.com>
Expand Down Expand Up @@ -55,7 +55,7 @@ dnl
dnl See the "Since" comment for each macro you use to see what version
dnl of the macros you require.
m4_defun([PKG_PREREQ],
[m4_define([PKG_MACROS_VERSION], [0.29.1])
[m4_define([PKG_MACROS_VERSION], [0.29.2])
m4_if(m4_version_compare(PKG_MACROS_VERSION, [$1]), -1,
[m4_fatal([pkg.m4 version $1 or higher is required but ]PKG_MACROS_VERSION[ found])])
])dnl PKG_PREREQ
Expand Down Expand Up @@ -156,7 +156,7 @@ AC_ARG_VAR([$1][_CFLAGS], [C compiler flags for $1, overriding pkg-config])dnl
AC_ARG_VAR([$1][_LIBS], [linker flags for $1, overriding pkg-config])dnl

pkg_failed=no
AC_MSG_CHECKING([for $1])
AC_MSG_CHECKING([for $2])

_PKG_CONFIG([$1][_CFLAGS], [cflags], [$2])
_PKG_CONFIG([$1][_LIBS], [libs], [$2])
Expand All @@ -166,11 +166,11 @@ and $1[]_LIBS to avoid the need to call pkg-config.
See the pkg-config man page for more details.])

if test $pkg_failed = yes; then
AC_MSG_RESULT([no])
AC_MSG_RESULT([no])
_PKG_SHORT_ERRORS_SUPPORTED
if test $_pkg_short_errors_supported = yes; then
$1[]_PKG_ERRORS=`$PKG_CONFIG --short-errors --print-errors --cflags --libs "$2" 2>&1`
else
else
$1[]_PKG_ERRORS=`$PKG_CONFIG --print-errors --cflags --libs "$2" 2>&1`
fi
# Put the nasty error message in config.log where it belongs
Expand All @@ -187,7 +187,7 @@ installed software in a non-standard prefix.
_PKG_TEXT])[]dnl
])
elif test $pkg_failed = untried; then
AC_MSG_RESULT([no])
AC_MSG_RESULT([no])
m4_default([$4], [AC_MSG_FAILURE(
[The pkg-config script could not be found or is too old. Make sure it
is in your PATH or set the PKG_CONFIG environment variable to the full
Expand Down Expand Up @@ -288,72 +288,4 @@ AS_VAR_COPY([$1], [pkg_cv_][$1])
AS_VAR_IF([$1], [""], [$5], [$4])dnl
])dnl PKG_CHECK_VAR

dnl PKG_WITH_MODULES(VARIABLE-PREFIX, MODULES,
dnl [ACTION-IF-FOUND],[ACTION-IF-NOT-FOUND],
dnl [DESCRIPTION], [DEFAULT])
dnl ------------------------------------------
dnl
dnl Prepare a "--with-" configure option using the lowercase
dnl [VARIABLE-PREFIX] name, merging the behaviour of AC_ARG_WITH and
dnl PKG_CHECK_MODULES in a single macro.
AC_DEFUN([PKG_WITH_MODULES],
[
m4_pushdef([with_arg], m4_tolower([$1]))

m4_pushdef([description],
[m4_default([$5], [build with ]with_arg[ support])])

m4_pushdef([def_arg], [m4_default([$6], [auto])])
m4_pushdef([def_action_if_found], [AS_TR_SH([with_]with_arg)=yes])
m4_pushdef([def_action_if_not_found], [AS_TR_SH([with_]with_arg)=no])

m4_case(def_arg,
[yes],[m4_pushdef([with_without], [--without-]with_arg)],
[m4_pushdef([with_without],[--with-]with_arg)])

AC_ARG_WITH(with_arg,
AS_HELP_STRING(with_without, description[ @<:@default=]def_arg[@:>@]),,
[AS_TR_SH([with_]with_arg)=def_arg])

AS_CASE([$AS_TR_SH([with_]with_arg)],
[yes],[PKG_CHECK_MODULES([$1],[$2],$3,$4)],
[auto],[PKG_CHECK_MODULES([$1],[$2],
[m4_n([def_action_if_found]) $3],
[m4_n([def_action_if_not_found]) $4])])

m4_popdef([with_arg])
m4_popdef([description])
m4_popdef([def_arg])

])dnl PKG_WITH_MODULES

dnl PKG_HAVE_WITH_MODULES(VARIABLE-PREFIX, MODULES,
dnl [DESCRIPTION], [DEFAULT])
dnl -----------------------------------------------
dnl
dnl Convenience macro to trigger AM_CONDITIONAL after PKG_WITH_MODULES
dnl check._[VARIABLE-PREFIX] is exported as make variable.
AC_DEFUN([PKG_HAVE_WITH_MODULES],
[
PKG_WITH_MODULES([$1],[$2],,,[$3],[$4])

AM_CONDITIONAL([HAVE_][$1],
[test "$AS_TR_SH([with_]m4_tolower([$1]))" = "yes"])
])dnl PKG_HAVE_WITH_MODULES

dnl PKG_HAVE_DEFINE_WITH_MODULES(VARIABLE-PREFIX, MODULES,
dnl [DESCRIPTION], [DEFAULT])
dnl ------------------------------------------------------
dnl
dnl Convenience macro to run AM_CONDITIONAL and AC_DEFINE after
dnl PKG_WITH_MODULES check. HAVE_[VARIABLE-PREFIX] is exported as make
dnl and preprocessor variable.
AC_DEFUN([PKG_HAVE_DEFINE_WITH_MODULES],
[
PKG_HAVE_WITH_MODULES([$1],[$2],[$3],[$4])

AS_IF([test "$AS_TR_SH([with_]m4_tolower([$1]))" = "yes"],
[AC_DEFINE([HAVE_][$1], 1, [Enable ]m4_tolower([$1])[ support])])
])dnl PKG_HAVE_DEFINE_WITH_MODULES

m4_include([m4/ax_check_openssl.m4])
2 changes: 1 addition & 1 deletion configure
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Original file line number Diff line number Diff line change
Expand Up @@ -11201,7 +11201,7 @@ for ac_func in alarm accept4 setitimer getitimer bind_textdomain_codeset chown \
initgroups kill killpg lchmod lchown lockf linkat lstat lutimes mmap \
memrchr mbrtowc mkdirat mkfifo \
mkfifoat mknod mknodat mktime mremap nice openat pathconf pause pipe2 plock poll \
posix_fallocate posix_fadvise pread \
posix_fallocate posix_fadvise pread preadv preadv2 \
pthread_init pthread_kill putenv pwrite readlink readlinkat readv realpath renameat \
sem_open sem_timedwait sem_getvalue sem_unlink sendfile setegid seteuid \
setgid sethostname \
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2 changes: 1 addition & 1 deletion configure.ac
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Expand Up @@ -3435,7 +3435,7 @@ AC_CHECK_FUNCS(alarm accept4 setitimer getitimer bind_textdomain_codeset chown \
initgroups kill killpg lchmod lchown lockf linkat lstat lutimes mmap \
memrchr mbrtowc mkdirat mkfifo \
mkfifoat mknod mknodat mktime mremap nice openat pathconf pause pipe2 plock poll \
posix_fallocate posix_fadvise pread \
posix_fallocate posix_fadvise pread preadv preadv2 \
pthread_init pthread_kill putenv pwrite readlink readlinkat readv realpath renameat \
sem_open sem_timedwait sem_getvalue sem_unlink sendfile setegid seteuid \
setgid sethostname \
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6 changes: 6 additions & 0 deletions pyconfig.h.in
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Expand Up @@ -707,6 +707,12 @@
/* Define to 1 if you have the `pread' function. */
#undef HAVE_PREAD

/* Define to 1 if you have the `preadv' function. */
#undef HAVE_PREADV

/* Define to 1 if you have the `preadv2' function. */
#undef HAVE_PREADV2

/* Define if you have the 'prlimit' functions. */
#undef HAVE_PRLIMIT

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