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from qmsk.net.libc cimport *

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from qmsk.net.py cimport raise_errno

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cdef fcntl_set_flag (int fd, int flag, bint value) :

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    """

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        Set the given FCNTL file status flag(s) to the given boolean value.

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        This will first get the current flags, then compute the new flags, and then update them if they have changed.

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    """

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    # get current flags

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    cdef int old_flags = fcntl(fd, F_GETFL, 0)

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    if old_flags < 0 :

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        raise_errno('fcntl')

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    # set bit

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    cdef int new_flags = (old_flags & ~flag) | (flag if value else 0)

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    if new_flags != old_flags :

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        # set flags

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        if fcntl(fd, F_SETFL, new_flags) :

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            raise_errno('fcntl')

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#cdef class Errno (py.OSError) :

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#    def __init__ (self, func) :

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#        self.func = func

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#        self.err = errno

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#        self.strerror = strerror(errno)

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#

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#    def __str__ (self) :

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#        return "%s: %s" % (self.func, self.strerror)

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#

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#cdef class GAIError (py.OSError) :

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#    def __init__ (self, func, err) :

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#        self.func = func

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#        self.err = err

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#        self.strerror = gai_strerror(err)

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#

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#    def __str__ (self) :

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#        return "%s: %s" % (self.func, self.strerror)

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#