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Issue #22054: Add os.get_blocking() and os.set_blocking() functions to get and

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set the blocking mode of a file descriptor (False if the O_NONBLOCK flag is
set, True otherwise). These functions are not available on Windows.
This commit is contained in:
Victor Stinner 2014-07-29 22:32:47 +02:00
parent 6aa4269ed2
commit 1db9e7bb19
13 changed files with 198 additions and 58 deletions
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53
Python/fileutils.c
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@ -1045,3 +1045,56 @@ _Py_dup(int fd)
return fd;
}
#ifndef MS_WINDOWS
/* Get the blocking mode of the file descriptor.
Return 0 if the O_NONBLOCK flag is set, 1 if the flag is cleared,
raise an exception and return -1 on error. */
int
_Py_get_blocking(int fd)
{
int flags = fcntl(fd, F_GETFL, 0);
if (flags < 0) {
PyErr_SetFromErrno(PyExc_OSError);
return -1;
}
return !(flags & O_NONBLOCK);
}
/* Set the blocking mode of the specified file descriptor.
Set the O_NONBLOCK flag if blocking is False, clear the O_NONBLOCK flag
otherwise.
Return 0 on success, raise an exception and return -1 on error. */
int
_Py_set_blocking(int fd, int blocking)
{
#if defined(HAVE_SYS_IOCTL_H) && defined(FIONBIO)
int arg = !blocking;
if (ioctl(fd, FIONBIO, &arg) < 0)
goto error;
#else
int flags, res;
flags = fcntl(fd, F_GETFL, 0);
if (flags < 0)
goto error;
if (blocking)
flags = flags & (~O_NONBLOCK);
else
flags = flags | O_NONBLOCK;
res = fcntl(fd, F_SETFL, flags);
if (res < 0)
goto error;
#endif
return 0;
error:
PyErr_SetFromErrno(PyExc_OSError);
return -1;
}
#endif