Issue #10812: Add some extra posix functions to the os module.

Doc/library/os.rst

@@ -743,6 +743,17 @@ as internal buffering of data.
    .. versionadded:: 3.3
 
 
+.. function:: fexecve(fd, args, env)
+
+   Execute the program specified by a file descriptor *fd* with arguments given
+   by *args* and environment given by *env*, replacing the current process.
+   *args* and *env* are given as in :func:`execve`.
+
+   Availability: Unix.
+
+   .. versionadded:: 3.3
+
+
 .. function:: fpathconf(fd, name)
 
    Return system configuration information relevant to an open file. *name*
@@ -819,6 +830,45 @@ as internal buffering of data.
    .. versionadded:: 3.3
 
 
+.. function:: futimens(fd, (atime_sec, atime_nsec), (mtime_sec, mtime_nsec))
+              futimens(fd, None, None)
+
+   Updates the timestamps of a file specified by the file descriptor *fd*, with
+   nanosecond precision.
+   The second form sets *atime* and *mtime* to the current time.
+   If *atime_nsec* or *mtime_nsec* is specified as :data:`UTIME_NOW`, the corresponding
+   timestamp is updated to the current time.
+   If *atime_nsec* or *mtime_nsec* is specified as :data:`UTIME_OMIT`, the corresponding
+   timestamp is not updated.
+
+   Availability: Unix.
+
+   .. versionadded:: 3.3
+
+
+.. data:: UTIME_NOW
+          UTIME_OMIT
+
+   Flags used with :func:`futimens` to specify that the timestamp must be
+   updated either to the current time or not updated at all.
+
+   Availability: Unix.
+
+   .. versionadded:: 3.3
+
+
+.. function:: futimes(fd, (atime, mtime))
+              futimes(fd, None)
+
+   Set the access and modified time of the file specified by the file
+   descriptor *fd* to the given values. If the second form is used, set the
+   access and modified times to the current time.
+
+   Availability: Unix.
+
+   .. versionadded:: 3.3
+
+
 .. function:: isatty(fd)
 
    Return ``True`` if the file descriptor *fd* is open and connected to a
@@ -841,6 +891,30 @@ as internal buffering of data.
    .. versionadded:: 3.3
 
 
+.. function:: lockf(fd, cmd, len)
+
+   Apply, test or remove a POSIX lock on an open file descriptor.
+   *fd* is an open file descriptor.
+   *cmd* specifies the command to use - one of :data:`F_LOCK`, :data:`F_TLOCK`,
+   :data:`F_ULOCK` or :data:`F_TEST`.
+   *len* specifies the section of the file to lock.
+
+   Availability: Unix.
+
+   .. versionadded:: 3.3
+
+
+.. data:: F_LOCK
+          F_TLOCK
+          F_ULOCK
+          F_TEST
+
+   Flags that specify what action :func:`lockf` will take.
+
+   Availability: Unix.
+
+   .. versionadded:: 3.3
+
 .. function:: lseek(fd, pos, how)
 
    Set the current position of file descriptor *fd* to position *pos*, modified
@@ -945,6 +1019,66 @@ as internal buffering of data.
    Availability: Unix, Windows.
 
 
+.. function:: posix_fallocate(fd, offset, len)
+
+   Ensures that enough disk space is allocated for the file specified by *fd*
+   starting from *offset* and continuing for *len* bytes.
+
+   Availability: Unix.
+
+   .. versionadded:: 3.3
+
+
+.. function:: posix_fadvise(fd, offset, len, advice)
+
+   Announces an intention to access data in a specific pattern thus allowing
+   the kernel to make optimizations.
+   The advice applies to the region of the file specified by *fd* starting at
+   *offset* and continuing for *len* bytes.
+   *advice* is one of :data:`POSIX_FADV_NORMAL`, :data:`POSIX_FADV_SEQUENTIAL`,
+   :data:`POSIX_FADV_RANDOM`, :data:`POSIX_FADV_NOREUSE`,
+   :data:`POSIX_FADV_WILLNEED` or :data:`POSIX_FADV_DONTNEED`.
+
+   Availability: Unix.
+
+   .. versionadded:: 3.3
+
+
+.. data:: POSIX_FADV_NORMAL
+          POSIX_FADV_SEQUENTIAL
+          POSIX_FADV_RANDOM
+          POSIX_FADV_NOREUSE
+          POSIX_FADV_WILLNEED
+          POSIX_FADV_DONTNEED
+
+   Flags that can be used in *advice* in :func:`posix_fadvise` that specify
+   the access pattern that is likely to be used.
+
+   Availability: Unix.
+
+   .. versionadded:: 3.3
+
+
+.. function:: pread(fd, buffersize, offset)
+
+   Read from a file descriptor, *fd*, at a position of *offset*. It will read up
+   to *buffersize* number of bytes. The file offset remains unchanged.
+
+   Availability: Unix.
+
+   .. versionadded:: 3.3
+
+
+.. function:: pwrite(fd, string, offset)
+
+   Write *string* to a file descriptor, *fd*, from *offset*, leaving the file
+   offset unchanged.
+
+   Availability: Unix.
+
+   .. versionadded:: 3.3
+
+
 .. function:: read(fd, n)
 
    Read at most *n* bytes from file descriptor *fd*. Return a bytestring containing the
@@ -1038,6 +1172,17 @@ as internal buffering of data.
    .. versionadded:: 3.3
 
 
+.. function:: readv(fd, buffers)
+
+   Read from a file descriptor into a number of writable buffers. *buffers* is
+   an arbitrary sequence of writable buffers. Returns the total number of bytes
+   read.
+
+   Availability: Unix.
+
+   .. versionadded:: 3.3
+
+
 .. function:: tcgetpgrp(fd)
 
    Return the process group associated with the terminal given by *fd* (an open
@@ -1111,6 +1256,17 @@ as internal buffering of data.
       :meth:`~file.write` method.
 
 
+.. function:: writev(fd, buffers)
+
+   Write the the contents of *buffers* to file descriptor *fd*, where *buffers*
+   is an arbitrary sequence of buffers.
+   Returns the total number of bytes written.
+
+   Availability: Unix.
+
+   .. versionadded:: 3.3
+
+
 .. _open-constants:
 
 ``open()`` flag constants
@@ -1384,6 +1540,17 @@ Files and Directories
       Added support for Windows 6.0 (Vista) symbolic links.
 
 
+.. function:: lutimes(path, (atime, mtime))
+              lutimes(path, None)
+
+   Like :func:`utime`, but if *path* is a symbolic link, it is not
+   dereferenced.
+
+   Availability: Unix.
+
+   .. versionadded:: 3.3
+
+
 .. function:: mkfifo(path[, mode])
 
    Create a FIFO (a named pipe) named *path* with numeric mode *mode*.  The
@@ -1727,6 +1894,25 @@ Files and Directories
       Added support for Windows 6.0 (Vista) symbolic links.
 
 
+.. function:: sync()
+
+   Force write of everything to disk.
+
+   Availability: Unix.
+
+   .. versionadded:: 3.3
+
+
+.. function:: truncate(path, length)
+
+   Truncate the file corresponding to *path*, so that it is at most
+   *length* bytes in size.
+
+   Availability: Unix.
+
+   .. versionadded:: 3.3
+
+
 .. function:: unlink(path)
 
    Remove (delete) the file *path*.  This is the same function as
@@ -2306,6 +2492,58 @@ written in Python, such as a mail server's external command delivery program.
 
    Availability: Unix.
 
+.. function:: waitid(idtype, id, options)
+
+   Wait for the completion of one or more child processes.
+   *idtype* can be :data:`P_PID`, :data:`P_PGID` or :data:`P_ALL`.
+   *id* specifies the pid to wait on.
+   *options* is constructed from the ORing of one or more of :data:`WEXITED`,
+   :data:`WSTOPPED` or :data:`WCONTINUED` and additionally may be ORed with
+   :data:`WNOHANG` or :data:`WNOWAIT`. The return value is an object
+   representing the data contained in the :c:type:`siginfo_t` structure, namely:
+   :attr:`si_pid`, :attr:`si_uid`, :attr:`si_signo`, :attr:`si_status`,
+   :attr:`si_code` or ``None`` if :data:`WNOHANG` is specified and there are no
+   children in a waitable state.
+
+   Availability: Unix.
+
+   .. versionadded:: 3.3
+
+.. data:: P_PID
+          P_PGID
+          P_ALL
+
+   These are the possible values for *idtype* in :func:`waitid`. They affect
+   how *id* is interpreted.
+
+   Availability: Unix.
+
+   .. versionadded:: 3.3
+
+.. data:: WEXITED
+          WSTOPPED
+          WNOWAIT
+
+   Flags that can be used in *options* in :func:`waitid` that specify what
+   child signal to wait for.
+
+   Availability: Unix.
+
+   .. versionadded:: 3.3
+
+
+.. data:: CLD_EXITED
+          CLD_DUMPED
+          CLD_TRAPPED
+          CLD_CONTINUED
+
+   These are the possible values for :attr:`si_code` in the result returned by
+   :func:`waitid`.
+
+   Availability: Unix.
+
+   .. versionadded:: 3.3
+
 
 .. function:: waitpid(pid, options)
 

Lib/test/test_posix.py

@@ -37,7 +37,7 @@ class PosixTester(unittest.TestCase):
         NO_ARG_FUNCTIONS = [ "ctermid", "getcwd", "getcwdb", "uname",
                              "times", "getloadavg",
                              "getegid", "geteuid", "getgid", "getgroups",
-                             "getpid", "getpgrp", "getppid", "getuid",
+                             "getpid", "getpgrp", "getppid", "getuid", "sync",
                            ]
 
         for name in NO_ARG_FUNCTIONS:
@@ -132,6 +132,156 @@ class PosixTester(unittest.TestCase):
             finally:
                 fp.close()
 
+    @unittest.skipUnless(hasattr(posix, 'truncate'), "test needs posix.truncate()")
+    def test_truncate(self):
+        with open(support.TESTFN, 'w') as fp:
+            fp.write('test')
+            fp.flush()
+        posix.truncate(support.TESTFN, 0)
+
+    @unittest.skipUnless(hasattr(posix, 'fexecve'), "test needs posix.fexecve()")
+    @unittest.skipUnless(hasattr(os, 'fork'), "test needs os.fork()")
+    @unittest.skipUnless(hasattr(os, 'wait'), "test needs os.wait()")
+    def test_fexecve(self):
+        fp = os.open(sys.executable, os.O_RDONLY)
+        try:
+            pid = os.fork()
+            if pid == 0:
+                os.chdir(os.path.split(sys.executable)[0])
+                posix.fexecve(fp, [sys.executable, '-c', 'pass'], os.environ)
+            else:
+                self.assertEqual(os.wait(), (pid, 0))
+        finally:
+            os.close(fp)
+
+    @unittest.skipUnless(hasattr(posix, 'waitid'), "test needs posix.waitid()")
+    @unittest.skipUnless(hasattr(os, 'fork'), "test needs os.fork()")
+    def test_waitid(self):
+        pid = os.fork()
+        if pid == 0:
+            os.chdir(os.path.split(sys.executable)[0])
+            posix.execve(sys.executable, [sys.executable, '-c', 'pass'], os.environ)
+        else:
+            res = posix.waitid(posix.P_PID, pid, posix.WEXITED)
+            self.assertEqual(pid, res.si_pid)
+
+    @unittest.skipUnless(hasattr(posix, 'lockf'), "test needs posix.lockf()")
+    def test_lockf(self):
+        fd = os.open(support.TESTFN, os.O_WRONLY | os.O_CREAT)
+        try:
+            os.write(fd, b'test')
+            os.lseek(fd, 0, os.SEEK_SET)
+            posix.lockf(fd, posix.F_LOCK, 4)
+            # section is locked
+            posix.lockf(fd, posix.F_ULOCK, 4)
+        finally:
+            os.close(fd)
+
+    @unittest.skipUnless(hasattr(posix, 'pread'), "test needs posix.pread()")
+    def test_pread(self):
+        fd = os.open(support.TESTFN, os.O_RDWR | os.O_CREAT)
+        try:
+            os.write(fd, b'test')
+            os.lseek(fd, 0, os.SEEK_SET)
+            self.assertEqual(b'es', posix.pread(fd, 2, 1))
+            # the first pread() shoudn't disturb the file offset
+            self.assertEqual(b'te', posix.read(fd, 2))
+        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)
+        try:
+            os.write(fd, b'test')
+            os.lseek(fd, 0, os.SEEK_SET)
+            posix.pwrite(fd, b'xx', 1)
+            self.assertEqual(b'txxt', posix.read(fd, 4))
+        finally:
+            os.close(fd)
+
+    @unittest.skipUnless(hasattr(posix, 'posix_fallocate'),
+        "test needs posix.posix_fallocate()")
+    def test_posix_fallocate(self):
+        fd = os.open(support.TESTFN, os.O_WRONLY | os.O_CREAT)
+        try:
+            posix.posix_fallocate(fd, 0, 10)
+        except OSError as inst:
+            # issue10812, ZFS doesn't appear to support posix_fallocate,
+            # so skip Solaris-based since they are likely to have ZFS.
+            if inst.errno != errno.EINVAL or not sys.platform.startswith("sunos"):
+                raise
+        finally:
+            os.close(fd)
+
+    @unittest.skipUnless(hasattr(posix, 'posix_fadvise'),
+        "test needs posix.posix_fadvise()")
+    def test_posix_fadvise(self):
+        fd = os.open(support.TESTFN, os.O_RDONLY)
+        try:
+            posix.posix_fadvise(fd, 0, 0, posix.POSIX_FADV_WILLNEED)
+        finally:
+            os.close(fd)
+
+    @unittest.skipUnless(hasattr(posix, 'futimes'), "test needs posix.futimes()")
+    def test_futimes(self):
+        now = time.time()
+        fd = os.open(support.TESTFN, os.O_RDONLY)
+        try:
+            posix.futimes(fd, None)
+            self.assertRaises(TypeError, posix.futimes, fd, (None, None))
+            self.assertRaises(TypeError, posix.futimes, fd, (now, None))
+            self.assertRaises(TypeError, posix.futimes, fd, (None, now))
+            posix.futimes(fd, (int(now), int(now)))
+            posix.futimes(fd, (now, now))
+        finally:
+            os.close(fd)
+
+    @unittest.skipUnless(hasattr(posix, 'lutimes'), "test needs posix.lutimes()")
+    def test_lutimes(self):
+        now = time.time()
+        posix.lutimes(support.TESTFN, None)
+        self.assertRaises(TypeError, posix.lutimes, support.TESTFN, (None, None))
+        self.assertRaises(TypeError, posix.lutimes, support.TESTFN, (now, None))
+        self.assertRaises(TypeError, posix.lutimes, support.TESTFN, (None, now))
+        posix.lutimes(support.TESTFN, (int(now), int(now)))
+        posix.lutimes(support.TESTFN, (now, now))
+
+    @unittest.skipUnless(hasattr(posix, 'futimens'), "test needs posix.futimens()")
+    def test_futimens(self):
+        now = time.time()
+        fd = os.open(support.TESTFN, os.O_RDONLY)
+        try:
+            self.assertRaises(TypeError, posix.futimens, fd, (None, None), (None, None))
+            self.assertRaises(TypeError, posix.futimens, fd, (now, 0), None)
+            self.assertRaises(TypeError, posix.futimens, fd, None, (now, 0))
+            posix.futimens(fd, (int(now), int((now - int(now)) * 1e9)),
+                    (int(now), int((now - int(now)) * 1e9)))
+        finally:
+            os.close(fd)
+
+    @unittest.skipUnless(hasattr(posix, 'writev'), "test needs posix.writev()")
+    def test_writev(self):
+        fd = os.open(support.TESTFN, os.O_RDWR | os.O_CREAT)
+        try:
+            os.writev(fd, (b'test1', b'tt2', b't3'))
+            os.lseek(fd, 0, os.SEEK_SET)
+            self.assertEqual(b'test1tt2t3', posix.read(fd, 10))
+        finally:
+            os.close(fd)
+
+    @unittest.skipUnless(hasattr(posix, 'readv'), "test needs posix.readv()")
+    def test_readv(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.readv(fd, buf), 10)
+            self.assertEqual([b'test1', b'tt2', b't3'], [bytes(i) for i in buf])
+        finally:
+            os.close(fd)
+
     def test_dup(self):
         if hasattr(posix, 'dup'):
             fp = open(support.TESTFN)

Misc/NEWS

@@ -72,6 +72,7 @@ Core and Builtins
 Library
 -------
 
+- Issue #10812: Add some extra posix functions to the os module.
 
 - Issue #10979: unittest stdout buffering now works with class and module
   setup and teardown.

configure

@@ -776,8 +776,7 @@ CFLAGS
 LDFLAGS
 LIBS
 CPPFLAGS
-CPP
-CPPFLAGS'
+CPP'
 
 
 # Initialize some variables set by options.
@@ -9251,19 +9250,21 @@ $as_echo "MACHDEP_OBJS" >&6; }
 # checks for library functions
 for ac_func in alarm accept4 setitimer getitimer bind_textdomain_codeset chown \
  clock confstr ctermid execv faccessat fchmod fchmodat fchown fchownat \
- fdopendir fork fpathconf fstatat ftime ftruncate futimesat \
+ fexecve fdopendir fork fpathconf fstatat ftime ftruncate futimesat \
+ futimens futimes \
  gai_strerror getgroups getlogin getloadavg getpeername getpgid getpid \
  getpriority getresuid getresgid getpwent getspnam getspent getsid getwd \
- initgroups kill killpg lchmod lchown linkat lstat mbrtowc mkdirat mkfifo \
+ initgroups kill killpg lchmod lchown lockf linkat lstat lutimes mbrtowc mkdirat mkfifo \
  mkfifoat mknod mknodat mktime mremap nice openat pathconf pause plock poll \
- pthread_init putenv readlink readlinkat realpath renameat \
+ posix_fallocate posix_fadvise pread \
+ pthread_init putenv pwrite readlink readlinkat readv realpath renameat \
  select sem_open sem_timedwait sem_getvalue sem_unlink sendfile setegid seteuid \
  setgid sethostname \
  setlocale setregid setreuid setresuid setresgid setsid setpgid setpgrp setpriority setuid setvbuf \
- sigaction siginterrupt sigrelse snprintf strftime strlcpy symlinkat \
+ sigaction siginterrupt sigrelse snprintf strftime strlcpy symlinkat sync \
  sysconf tcgetpgrp tcsetpgrp tempnam timegm times tmpfile tmpnam tmpnam_r \
- truncate uname unlinkat unsetenv utimensat utimes waitpid wait3 wait4 \
- wcscoll wcsftime wcsxfrm _getpty
+ truncate uname unlinkat unsetenv utimensat utimes waitid waitpid wait3 wait4 \
+ wcscoll wcsftime wcsxfrm writev _getpty
 do :
   as_ac_var=`$as_echo "ac_cv_func_$ac_func" | $as_tr_sh`
 ac_fn_c_check_func "$LINENO" "$ac_func" "$as_ac_var"

configure.in

@@ -2496,19 +2496,21 @@ AC_MSG_RESULT(MACHDEP_OBJS)
 # checks for library functions
 AC_CHECK_FUNCS(alarm accept4 setitimer getitimer bind_textdomain_codeset chown \
  clock confstr ctermid execv faccessat fchmod fchmodat fchown fchownat \
- fdopendir fork fpathconf fstatat ftime ftruncate futimesat \
+ fexecve fdopendir fork fpathconf fstatat ftime ftruncate futimesat \
+ futimens futimes \
  gai_strerror getgroups getlogin getloadavg getpeername getpgid getpid \
  getpriority getresuid getresgid getpwent getspnam getspent getsid getwd \
- initgroups kill killpg lchmod lchown linkat lstat mbrtowc mkdirat mkfifo \
+ initgroups kill killpg lchmod lchown lockf linkat lstat lutimes mbrtowc mkdirat mkfifo \
  mkfifoat mknod mknodat mktime mremap nice openat pathconf pause plock poll \
- pthread_init putenv readlink readlinkat realpath renameat \
+ posix_fallocate posix_fadvise pread \
+ pthread_init putenv pwrite readlink readlinkat readv realpath renameat \
  select sem_open sem_timedwait sem_getvalue sem_unlink sendfile setegid seteuid \
  setgid sethostname \
  setlocale setregid setreuid setresuid setresgid setsid setpgid setpgrp setpriority setuid setvbuf \
- sigaction siginterrupt sigrelse snprintf strftime strlcpy symlinkat \
+ sigaction siginterrupt sigrelse snprintf strftime strlcpy symlinkat sync \
  sysconf tcgetpgrp tcsetpgrp tempnam timegm times tmpfile tmpnam tmpnam_r \
- truncate uname unlinkat unsetenv utimensat utimes waitpid wait3 wait4 \
- wcscoll wcsftime wcsxfrm _getpty)
+ truncate uname unlinkat unsetenv utimensat utimes waitid waitpid wait3 wait4 \
+ wcscoll wcsftime wcsxfrm writev _getpty)
 
 # For some functions, having a definition is not sufficient, since
 # we want to take their address.

pyconfig.h.in

@@ -232,6 +232,9 @@
 /* Define to 1 if you have the `fdopendir' function. */
 #undef HAVE_FDOPENDIR
 
+/* Define to 1 if you have the `fexecve' function. */
+#undef HAVE_FEXECVE
+
 /* Define to 1 if you have the `finite' function. */
 #undef HAVE_FINITE
 
@@ -274,6 +277,12 @@
 /* Define to 1 if you have the `ftruncate' function. */
 #undef HAVE_FTRUNCATE
 
+/* Define to 1 if you have the `futimens' function. */
+#undef HAVE_FUTIMENS
+
+/* Define to 1 if you have the `futimes' function. */
+#undef HAVE_FUTIMES
+
 /* Define to 1 if you have the `futimesat' function. */
 #undef HAVE_FUTIMESAT
 
@@ -461,6 +470,9 @@
 /* Define to 1 if you have the <linux/tipc.h> header file. */
 #undef HAVE_LINUX_TIPC_H
 
+/* Define to 1 if you have the `lockf' function. */
+#undef HAVE_LOCKF
+
 /* Define to 1 if you have the `log1p' function. */
 #undef HAVE_LOG1P
 
@@ -473,6 +485,9 @@
 /* Define to 1 if you have the `lstat' function. */
 #undef HAVE_LSTAT
 
+/* Define to 1 if you have the `lutimes' function. */
+#undef HAVE_LUTIMES
+
 /* Define this if you have the makedev macro. */
 #undef HAVE_MAKEDEV
 
@@ -545,6 +560,15 @@
 /* Define to 1 if you have the <poll.h> header file. */
 #undef HAVE_POLL_H
 
+/* Define to 1 if you have the `posix_fadvise' function. */
+#undef HAVE_POSIX_FADVISE
+
+/* Define to 1 if you have the `posix_fallocate' function. */
+#undef HAVE_POSIX_FALLOCATE
+
+/* Define to 1 if you have the `pread' function. */
+#undef HAVE_PREAD
+
 /* Define to 1 if you have the <process.h> header file. */
 #undef HAVE_PROCESS_H
 
@@ -569,12 +593,18 @@
 /* Define to 1 if you have the `putenv' function. */
 #undef HAVE_PUTENV
 
+/* Define to 1 if you have the `pwrite' function. */
+#undef HAVE_PWRITE
+
 /* Define to 1 if you have the `readlink' function. */
 #undef HAVE_READLINK
 
 /* Define to 1 if you have the `readlinkat' function. */
 #undef HAVE_READLINKAT
 
+/* Define to 1 if you have the `readv' function. */
+#undef HAVE_READV
+
 /* Define to 1 if you have the `realpath' function. */
 #undef HAVE_REALPATH
 
@@ -775,6 +805,9 @@
 /* Define to 1 if you have the `symlinkat' function. */
 #undef HAVE_SYMLINKAT
 
+/* Define to 1 if you have the `sync' function. */
+#undef HAVE_SYNC
+
 /* Define to 1 if you have the `sysconf' function. */
 #undef HAVE_SYSCONF
 
@@ -952,6 +985,9 @@
 /* Define to 1 if you have the `wait4' function. */
 #undef HAVE_WAIT4
 
+/* Define to 1 if you have the `waitid' function. */
+#undef HAVE_WAITID
+
 /* Define to 1 if you have the `waitpid' function. */
 #undef HAVE_WAITPID
 
@@ -971,6 +1007,9 @@
    */
 #undef HAVE_WORKING_TZSET
 
+/* Define to 1 if you have the `writev' function. */
+#undef HAVE_WRITEV
+
 /* Define if the zlib library has inflateCopy */
 #undef HAVE_ZLIB_COPY