text: 
  /* fcntl module */
  
  #define PY_SSIZE_T_CLEAN
  
  #include "Python.h"
  
  #ifdef HAVE_SYS_FILE_H
  #include <sys/file.h>
  #endif
  
  #include <sys/ioctl.h>
  #include <fcntl.h>
  #ifdef HAVE_STROPTS_H
  #include <stropts.h>
  #endif
  
  /*[clinic input]
  output preset file
  module fcntl
  [clinic start generated code]*/
  /*[clinic end generated code: output=da39a3ee5e6b4b0d input=c7356fdb126a904a]*/
  
  static int
  conv_descriptor(PyObject *object, int *target)
  {
      int fd = PyObject_AsFileDescriptor(object);
  
      if (fd < 0)
      return 0;
      *target = fd;
      return 1;
  }
  
  /* Must come after conv_descriptor definition. */
  #include "clinic/fcntlmodule.c.h"
  
  /*[clinic input]
  fcntl.fcntl
  
      fd: object(type='int', converter='conv_descriptor')
      code: int
      arg: object = NULL
      /
  
  Perform the operation `code` on file descriptor fd.
  
  The values used for `code` are operating system dependent, and are available
  as constants in the fcntl module, using the same names as used in
  the relevant C header files.  The argument arg is optional, and
  defaults to 0; it may be an int or a string.  If arg is given as a string,
  the return value of fcntl is a string of that length, containing the
  resulting value put in the arg buffer by the operating system.  The length
  of the arg string is not allowed to exceed 1024 bytes.  If the arg given
  is an integer or if none is specified, the result value is an integer
  corresponding to the return value of the fcntl call in the C code.
  [clinic start generated code]*/
  
  static PyObject *
  fcntl_fcntl_impl(PyModuleDef *module, int fd, int code, PyObject *arg)
  /*[clinic end generated code: output=afc5bfa74a03ef0d input=4850c13a41e86930]*/
  {
      unsigned int int_arg = 0;
      int ret;
      char *str;
      Py_ssize_t len;
      char buf[1024];
  
      if (arg != NULL) {
          int parse_result;
  
          if (PyArg_Parse(arg, "s#", &str, &len)) {
              if ((size_t)len > sizeof buf) {
                  PyErr_SetString(PyExc_ValueError,
                                  "fcntl string arg too long");
                  return NULL;
              }
              memcpy(buf, str, len);
              Py_BEGIN_ALLOW_THREADS
              ret = fcntl(fd, code, buf);
              Py_END_ALLOW_THREADS
              if (ret < 0) {
                  PyErr_SetFromErrno(PyExc_IOError);
                  return NULL;
              }
              return PyBytes_FromStringAndSize(buf, len);
          }
  
          PyErr_Clear();
          parse_result = PyArg_Parse(arg,
              "I;fcntl requires a file or file descriptor,"
              " an integer and optionally a third integer or a string",
              &int_arg);
          if (!parse_result) {
            return NULL;
          }
      }
  
      Py_BEGIN_ALLOW_THREADS
      ret = fcntl(fd, code, (int)int_arg);
      Py_END_ALLOW_THREADS
      if (ret < 0) {
          PyErr_SetFromErrno(PyExc_IOError);
          return NULL;
      }
      return PyLong_FromLong((long)ret);
  }
  
  
  /*[clinic input]
  fcntl.ioctl
  
      fd: object(type='int', converter='conv_descriptor')
      op as code: unsigned_int(bitwise=True)
      arg as ob_arg: object = NULL
      mutate_flag as mutate_arg: bool = True
      /
  
  Perform the operation op on file descriptor fd.
  
  The values used for op are operating system dependent, and are available as
  constants in the fcntl or termios library modules, using the same names as
  used in the relevant C header files.
  
  The argument `arg` is optional, and defaults to 0; it may be an int or a
  buffer containing character data (most likely a string or an array).
  
  If the argument is a mutable buffer (such as an array) and if the
  mutate_flag argument (which is only allowed in this case) is true then the
  buffer is (in effect) passed to the operating system and changes made by
  the OS will be reflected in the contents of the buffer after the call has
  returned.  The return value is the integer returned by the ioctl system
  call.
  
  If the argument is a mutable buffer and the mutable_flag argument is not
  passed or is false, the behavior is as if a string had been passed.  This
  behavior will change in future releases of Python.
  
  If the argument is an immutable buffer (most likely a string) then a copy
  of the buffer is passed to the operating system and the return value is a
  string of the same length containing whatever the operating system put in
  the buffer.  The length of the arg buffer in this case is not allowed to
  exceed 1024 bytes.
  
  If the arg given is an integer or if none is specified, the result value is
  an integer corresponding to the return value of the ioctl call in the C
  code.
  [clinic start generated code]*/
  
  static PyObject *
  fcntl_ioctl_impl(PyModuleDef *module, int fd, unsigned int code, PyObject *ob_arg, int mutate_arg)
  /*[clinic end generated code: output=ad47738c118622bf input=a55a6ee8e494c449]*/
  {
  #define IOCTL_BUFSZ 1024
      /* We use the unsigned non-checked 'I' format for the 'code' parameter
         because the system expects it to be a 32bit bit field value
         regardless of it being passed as an int or unsigned long on
         various platforms.  See the termios.TIOCSWINSZ constant across
         platforms for an example of this.
  
         If any of the 64bit platforms ever decide to use more than 32bits
         in their unsigned long ioctl codes this will break and need
         special casing based on the platform being built on.
       */
      int arg = 0;
      int ret;
      Py_buffer pstr;
      char *str;
      Py_ssize_t len;
      char buf[IOCTL_BUFSZ+1];  /* argument plus NUL byte */
  
      if (ob_arg != NULL) {
          if (PyArg_Parse(ob_arg, "w*:ioctl", &pstr)) {
              char *arg;
              str = pstr.buf;
              len = pstr.len;
  
              if (mutate_arg) {
                  if (len <= IOCTL_BUFSZ) {
                      memcpy(buf, str, len);
                      buf[len] = '\0';
                      arg = buf;
                  }
                  else {
                      arg = str;
                  }
              }
              else {
                  if (len > IOCTL_BUFSZ) {
                      PyBuffer_Release(&pstr);
                      PyErr_SetString(PyExc_ValueError,
                          "ioctl string arg too long");
                      return NULL;
                  }
                  else {
                      memcpy(buf, str, len);
                      buf[len] = '\0';
                      arg = buf;
                  }
              }
              if (buf == arg) {
                  Py_BEGIN_ALLOW_THREADS /* think array.resize() */
                  ret = ioctl(fd, code, arg);
                  Py_END_ALLOW_THREADS
              }
              else {
                  ret = ioctl(fd, code, arg);
              }
              if (mutate_arg && (len <= IOCTL_BUFSZ)) {
                  memcpy(str, buf, len);
              }
              PyBuffer_Release(&pstr); /* No further access to str below this point */
              if (ret < 0) {
                  PyErr_SetFromErrno(PyExc_IOError);
                  return NULL;
              }
              if (mutate_arg) {
                  return PyLong_FromLong(ret);
              }
              else {
                  return PyBytes_FromStringAndSize(buf, len);
              }
          }
  
          PyErr_Clear();
          if (PyArg_Parse(ob_arg, "s*:ioctl", &pstr)) {
              str = pstr.buf;
              len = pstr.len;
              if (len > IOCTL_BUFSZ) {
                  PyBuffer_Release(&pstr);
                  PyErr_SetString(PyExc_ValueError,
                                  "ioctl string arg too long");
                  return NULL;
              }
              memcpy(buf, str, len);
              buf[len] = '\0';
              Py_BEGIN_ALLOW_THREADS
              ret = ioctl(fd, code, buf);
              Py_END_ALLOW_THREADS
              if (ret < 0) {
                  PyBuffer_Release(&pstr);
                  PyErr_SetFromErrno(PyExc_IOError);
                  return NULL;
              }
              PyBuffer_Release(&pstr);
              return PyBytes_FromStringAndSize(buf, len);
          }
  
          PyErr_Clear();
          if (!PyArg_Parse(ob_arg,
               "i;ioctl requires a file or file descriptor,"
               " an integer and optionally an integer or buffer argument",
               &arg)) {
            return NULL;
          }
          // Fall-through to outside the 'if' statement.
      }
      Py_BEGIN_ALLOW_THREADS
      ret = ioctl(fd, code, arg);
      Py_END_ALLOW_THREADS
      if (ret < 0) {
          PyErr_SetFromErrno(PyExc_IOError);
          return NULL;
      }
      return PyLong_FromLong((long)ret);
  #undef IOCTL_BUFSZ
  }
  
  /*[clinic input]
  fcntl.flock
  
      fd: object(type='int', converter='conv_descriptor')
      code: int
      /
  
  Perform the lock operation op on file descriptor fd.
  
  See the Unix manual page for flock(2) for details (On some systems, this
  function is emulated using fcntl()).
  [clinic start generated code]*/
  
  static PyObject *
  fcntl_flock_impl(PyModuleDef *module, int fd, int code)
  /*[clinic end generated code: output=c9035133a7dbfc96 input=b762aa9448d05e43]*/
  {
      int ret;
  
  #ifdef HAVE_FLOCK
      Py_BEGIN_ALLOW_THREADS
      ret = flock(fd, code);
      Py_END_ALLOW_THREADS
  #else
  
  #ifndef LOCK_SH
  #define LOCK_SH         1       /* shared lock */
  #define LOCK_EX         2       /* exclusive lock */
  #define LOCK_NB         4       /* don't block when locking */
  #define LOCK_UN         8       /* unlock */
  #endif
      {
          struct flock l;
          if (code == LOCK_UN)
              l.l_type = F_UNLCK;
          else if (code & LOCK_SH)
              l.l_type = F_RDLCK;
          else if (code & LOCK_EX)
              l.l_type = F_WRLCK;
          else {
              PyErr_SetString(PyExc_ValueError,
                              "unrecognized flock argument");
              return NULL;
          }
          l.l_whence = l.l_start = l.l_len = 0;
          Py_BEGIN_ALLOW_THREADS
          ret = fcntl(fd, (code & LOCK_NB) ? F_SETLK : F_SETLKW, &l);
          Py_END_ALLOW_THREADS
      }
  #endif /* HAVE_FLOCK */
      if (ret < 0) {
          PyErr_SetFromErrno(PyExc_IOError);
          return NULL;
      }
      Py_RETURN_NONE;
  }
  
  
  /*[clinic input]
  fcntl.lockf
  
      fd: object(type='int', converter='conv_descriptor')
      code: int
      lenobj: object = NULL
      startobj: object = NULL
      whence: int = 0
      /
  
  A wrapper around the fcntl() locking calls.
  
  fd is the file descriptor of the file to lock or unlock, and operation is one
  of the following values:
  
      LOCK_UN - unlock
      LOCK_SH - acquire a shared lock
      LOCK_EX - acquire an exclusive lock
  
  When operation is LOCK_SH or LOCK_EX, it can also be bitwise ORed with
  LOCK_NB to avoid blocking on lock acquisition.  If LOCK_NB is used and the
  lock cannot be acquired, an IOError will be raised and the exception will
  have an errno attribute set to EACCES or EAGAIN (depending on the operating
  system -- for portability, check for either value).
  
  length is the number of bytes to lock, with the default meaning to lock to
  EOF.  start is the byte offset, relative to whence, to that the lock
  starts.  whence is as with fileobj.seek(), specifically:
  
      0 - relative to the start of the file (SEEK_SET)
      1 - relative to the current buffer position (SEEK_CUR)
      2 - relative to the end of the file (SEEK_END)
  [clinic start generated code]*/
  
  static PyObject *
  fcntl_lockf_impl(PyModuleDef *module, int fd, int code, PyObject *lenobj, PyObject *startobj, int whence)
  /*[clinic end generated code: output=5536df2892bf3ce9 input=44856fa06db36184]*/
  {
      int ret;
  
  #ifndef LOCK_SH
  #define LOCK_SH         1       /* shared lock */
  #define LOCK_EX         2       /* exclusive lock */
  #define LOCK_NB         4       /* don't block when locking */
  #define LOCK_UN         8       /* unlock */
  #endif  /* LOCK_SH */
      {
          struct flock l;
          if (code == LOCK_UN)
              l.l_type = F_UNLCK;
          else if (code & LOCK_SH)
              l.l_type = F_RDLCK;
          else if (code & LOCK_EX)
              l.l_type = F_WRLCK;
          else {
              PyErr_SetString(PyExc_ValueError,
                              "unrecognized lockf argument");
              return NULL;
          }
          l.l_start = l.l_len = 0;
          if (startobj != NULL) {
  #if !defined(HAVE_LARGEFILE_SUPPORT)
              l.l_start = PyLong_AsLong(startobj);
  #else
              l.l_start = PyLong_Check(startobj) ?
                              PyLong_AsLongLong(startobj) :
                      PyLong_AsLong(startobj);
  #endif
              if (PyErr_Occurred())
                  return NULL;
          }
          if (lenobj != NULL) {
  #if !defined(HAVE_LARGEFILE_SUPPORT)
              l.l_len = PyLong_AsLong(lenobj);
  #else
              l.l_len = PyLong_Check(lenobj) ?
                              PyLong_AsLongLong(lenobj) :
                      PyLong_AsLong(lenobj);
  #endif
              if (PyErr_Occurred())
                  return NULL;
          }
          l.l_whence = whence;
          Py_BEGIN_ALLOW_THREADS
          ret = fcntl(fd, (code & LOCK_NB) ? F_SETLK : F_SETLKW, &l);
          Py_END_ALLOW_THREADS
      }
      if (ret < 0) {
          PyErr_SetFromErrno(PyExc_IOError);
          return NULL;
      }
      Py_RETURN_NONE;
  }
  
  /* List of functions */
  
  static PyMethodDef fcntl_methods[] = {
      FCNTL_FCNTL_METHODDEF
      FCNTL_IOCTL_METHODDEF
      FCNTL_FLOCK_METHODDEF
      FCNTL_LOCKF_METHODDEF
      {NULL, NULL}  /* sentinel */
  };
  
  
  PyDoc_STRVAR(module_doc,
  "This module performs file control and I/O control on file \n\
  descriptors.  It is an interface to the fcntl() and ioctl() Unix\n\
  routines.  File descriptors can be obtained with the fileno() method of\n\
  a file or socket object.");
  
  /* Module initialisation */
  
  
  static int
  all_ins(PyObject* m)
  {
      if (PyModule_AddIntMacro(m, LOCK_SH)) return -1;
      if (PyModule_AddIntMacro(m, LOCK_EX)) return -1;
      if (PyModule_AddIntMacro(m, LOCK_NB)) return -1;
      if (PyModule_AddIntMacro(m, LOCK_UN)) return -1;
  /* GNU extensions, as of glibc 2.2.4 */
  #ifdef LOCK_MAND
      if (PyModule_AddIntMacro(m, LOCK_MAND)) return -1;
  #endif
  #ifdef LOCK_READ
      if (PyModule_AddIntMacro(m, LOCK_READ)) return -1;
  #endif
  #ifdef LOCK_WRITE
      if (PyModule_AddIntMacro(m, LOCK_WRITE)) return -1;
  #endif
  #ifdef LOCK_RW
      if (PyModule_AddIntMacro(m, LOCK_RW)) return -1;
  #endif
  
  #ifdef F_DUPFD
      if (PyModule_AddIntMacro(m, F_DUPFD)) return -1;
  #endif
  #ifdef F_DUPFD_CLOEXEC
      if (PyModule_AddIntMacro(m, F_DUPFD_CLOEXEC)) return -1;
  #endif
  #ifdef F_GETFD
      if (PyModule_AddIntMacro(m, F_GETFD)) return -1;
  #endif
  #ifdef F_SETFD
      if (PyModule_AddIntMacro(m, F_SETFD)) return -1;
  #endif
  #ifdef F_GETFL
      if (PyModule_AddIntMacro(m, F_GETFL)) return -1;
  #endif
  #ifdef F_SETFL
      if (PyModule_AddIntMacro(m, F_SETFL)) return -1;
  #endif
  #ifdef F_GETLK
      if (PyModule_AddIntMacro(m, F_GETLK)) return -1;
  #endif
  #ifdef F_SETLK
      if (PyModule_AddIntMacro(m, F_SETLK)) return -1;
  #endif
  #ifdef F_SETLKW
      if (PyModule_AddIntMacro(m, F_SETLKW)) return -1;
  #endif
  #ifdef F_GETOWN
      if (PyModule_AddIntMacro(m, F_GETOWN)) return -1;
  #endif
  #ifdef F_SETOWN
      if (PyModule_AddIntMacro(m, F_SETOWN)) return -1;
  #endif
  #ifdef F_GETSIG
      if (PyModule_AddIntMacro(m, F_GETSIG)) return -1;
  #endif
  #ifdef F_SETSIG
      if (PyModule_AddIntMacro(m, F_SETSIG)) return -1;
  #endif
  #ifdef F_RDLCK
      if (PyModule_AddIntMacro(m, F_RDLCK)) return -1;
  #endif
  #ifdef F_WRLCK
      if (PyModule_AddIntMacro(m, F_WRLCK)) return -1;
  #endif
  #ifdef F_UNLCK
      if (PyModule_AddIntMacro(m, F_UNLCK)) return -1;
  #endif
  /* LFS constants */
  #ifdef F_GETLK64
      if (PyModule_AddIntMacro(m, F_GETLK64)) return -1;
  #endif
  #ifdef F_SETLK64
      if (PyModule_AddIntMacro(m, F_SETLK64)) return -1;
  #endif
  #ifdef F_SETLKW64
      if (PyModule_AddIntMacro(m, F_SETLKW64)) return -1;
  #endif
  /* GNU extensions, as of glibc 2.2.4. */
  #ifdef FASYNC
      if (PyModule_AddIntMacro(m, FASYNC)) return -1;
  #endif
  #ifdef F_SETLEASE
      if (PyModule_AddIntMacro(m, F_SETLEASE)) return -1;
  #endif
  #ifdef F_GETLEASE
      if (PyModule_AddIntMacro(m, F_GETLEASE)) return -1;
  #endif
  #ifdef F_NOTIFY
      if (PyModule_AddIntMacro(m, F_NOTIFY)) return -1;
  #endif
  /* Old BSD flock(). */
  #ifdef F_EXLCK
      if (PyModule_AddIntMacro(m, F_EXLCK)) return -1;
  #endif
  #ifdef F_SHLCK
      if (PyModule_AddIntMacro(m, F_SHLCK)) return -1;
  #endif
  
  /* OS X specifics */
  #ifdef F_FULLFSYNC
      if (PyModule_AddIntMacro(m, F_FULLFSYNC)) return -1;
  #endif
  #ifdef F_NOCACHE
      if (PyModule_AddIntMacro(m, F_NOCACHE)) return -1;
  #endif
  
  /* For F_{GET|SET}FL */
  #ifdef FD_CLOEXEC
      if (PyModule_AddIntMacro(m, FD_CLOEXEC)) return -1;
  #endif
  
  /* For F_NOTIFY */
  #ifdef DN_ACCESS
      if (PyModule_AddIntMacro(m, DN_ACCESS)) return -1;
  #endif
  #ifdef DN_MODIFY
      if (PyModule_AddIntMacro(m, DN_MODIFY)) return -1;
  #endif
  #ifdef DN_CREATE
      if (PyModule_AddIntMacro(m, DN_CREATE)) return -1;
  #endif
  #ifdef DN_DELETE
      if (PyModule_AddIntMacro(m, DN_DELETE)) return -1;
  #endif
  #ifdef DN_RENAME
      if (PyModule_AddIntMacro(m, DN_RENAME)) return -1;
  #endif
  #ifdef DN_ATTRIB
      if (PyModule_AddIntMacro(m, DN_ATTRIB)) return -1;
  #endif
  #ifdef DN_MULTISHOT
      if (PyModule_AddIntMacro(m, DN_MULTISHOT)) return -1;
  #endif
  
  #ifdef HAVE_STROPTS_H
      /* Unix 98 guarantees that these are in stropts.h. */
      if (PyModule_AddIntMacro(m, I_PUSH)) return -1;
      if (PyModule_AddIntMacro(m, I_POP)) return -1;
      if (PyModule_AddIntMacro(m, I_LOOK)) return -1;
      if (PyModule_AddIntMacro(m, I_FLUSH)) return -1;
      if (PyModule_AddIntMacro(m, I_FLUSHBAND)) return -1;
      if (PyModule_AddIntMacro(m, I_SETSIG)) return -1;
      if (PyModule_AddIntMacro(m, I_GETSIG)) return -1;
      if (PyModule_AddIntMacro(m, I_FIND)) return -1;
      if (PyModule_AddIntMacro(m, I_PEEK)) return -1;
      if (PyModule_AddIntMacro(m, I_SRDOPT)) return -1;
      if (PyModule_AddIntMacro(m, I_GRDOPT)) return -1;
      if (PyModule_AddIntMacro(m, I_NREAD)) return -1;
      if (PyModule_AddIntMacro(m, I_FDINSERT)) return -1;
      if (PyModule_AddIntMacro(m, I_STR)) return -1;
      if (PyModule_AddIntMacro(m, I_SWROPT)) return -1;
  #ifdef I_GWROPT
      /* despite the comment above, old-ish glibcs miss a couple... */
      if (PyModule_AddIntMacro(m, I_GWROPT)) return -1;
  #endif
      if (PyModule_AddIntMacro(m, I_SENDFD)) return -1;
      if (PyModule_AddIntMacro(m, I_RECVFD)) return -1;
      if (PyModule_AddIntMacro(m, I_LIST)) return -1;
      if (PyModule_AddIntMacro(m, I_ATMARK)) return -1;
      if (PyModule_AddIntMacro(m, I_CKBAND)) return -1;
      if (PyModule_AddIntMacro(m, I_GETBAND)) return -1;
      if (PyModule_AddIntMacro(m, I_CANPUT)) return -1;
      if (PyModule_AddIntMacro(m, I_SETCLTIME)) return -1;
  #ifdef I_GETCLTIME
      if (PyModule_AddIntMacro(m, I_GETCLTIME)) return -1;
  #endif
      if (PyModule_AddIntMacro(m, I_LINK)) return -1;
      if (PyModule_AddIntMacro(m, I_UNLINK)) return -1;
      if (PyModule_AddIntMacro(m, I_PLINK)) return -1;
      if (PyModule_AddIntMacro(m, I_PUNLINK)) return -1;
  #endif
  
      return 0;
  }
  
  
  static struct PyModuleDef fcntlmodule = {
      PyModuleDef_HEAD_INIT,
      "fcntl",
      module_doc,
      -1,
      fcntl_methods,
      NULL,
      NULL,
      NULL,
      NULL
  };
  
  PyMODINIT_FUNC
  PyInit_fcntl(void)
  {
      PyObject *m;
  
      /* Create the module and add the functions and documentation */
      m = PyModule_Create(&fcntlmodule);
      if (m == NULL)
          return NULL;
  
      /* Add some symbolic constants to the module */
      if (all_ins(m) < 0)
          return NULL;
  
      return m;
  }
  