# -*- python -*-
'''
pylibgamma — Python 3 wrapper for libgamma
Copyright © 2014 Mattias Andrée (maandree@member.fsf.org)
This library is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this library. If not, see <http://www.gnu.org/licenses/>.
'''
cimport cython
from posix.unistd cimport gid_t
cdef extern int errno
'''
`errno` of course.
'''
cdef extern gid_t libgamma_group_gid
'''
Group that the user needs to be a member of if
`LIBGAMMA_DEVICE_REQUIRE_GROUP` is returned.
'''
cdef extern const char* libgamma_group_name
'''
Group that the user needs to be a member of if
`LIBGAMMA_DEVICE_REQUIRE_GROUP` is returned,
`NULL` if the name of the group `libgamma_group_gid`
cannot be determined.
'''
cdef extern void libgamma_perror(const char* name, int error_code)
'''
Prints an error to stderr in a `perror` fashion,
however this function will not translate the `libgamma`
errors into human-readable strings, it will simply
print the name of the error. If the value `error_code`
is the value of `LIBGAMMA_ERRNO_SET`, `perror` will be
used to print the current error stored in `errno`.
If `error_code` is non-negative (an `errno` value`), that
value will be stored in `errno` and `perror` will be
used to print it. Additionally, if the `error_code` is
the value of `LIBGAMMA_DEVICE_REQUIRE_GROUP` the
required group will be printed with its numerical value
and, if known, its name.
@param name The text to add at the beginning.
@param value The error code, may be an `errno` value.
'''
cdef extern const char* libgamma_name_of_error(int value)
'''
Returns the name of the definition associated with a `libgamma` error code.
@param value The error code.
@return The name of the definition associated with the error code,
`NULL` if the error code does not exist. The return string
should not be `free`:d.
'''
cdef extern int libgamma_value_of_error(const char* name)
'''
Return the value of a `libgamma` error definition refered to by name.
@param name The name of the definition associated with the error code.
@return The error code, zero if the name does is `NULL`
or does not refer to a `libgamma` error.
'''
def libgamma_native_get_errno() -> int:
'''
Get the current value, for the current thread, of `errno`.
@return The value `errno`.
'''
return int(errno)
def libgamma_native_get_group_gid() -> int:
'''
Getter.
Group that the user needs to be a member of if
`LIBGAMMA_DEVICE_REQUIRE_GROUP` is returned.
'''
return int(libgamma_group_gid)
def libgamma_native_set_group_gid(gid : int):
'''
Setter.
Group that the user needs to be a member of if
`LIBGAMMA_DEVICE_REQUIRE_GROUP` is returned.
'''
libgamma_group_gid = <int>gid
def libgamma_native_get_group_name() -> str:
'''
Getter.
Group that the user needs to be a member of if
`LIBGAMMA_DEVICE_REQUIRE_GROUP` is returned,
`None` if the name of the group `libgamma_group_gid`
cannot be determined.
'''
cdef bytes bs
if libgamma_group_name == NULL:
return None
bs = libgamma_group_name
return bs.decode('utf-8', 'strict')
def libgamma_native_set_group_name(name : str):
'''
Setter.
Group that the user needs to be a member of if
`LIBGAMMA_DEVICE_REQUIRE_GROUP` is returned,
`None` if the name of the group `libgamma_group_gid`
cannot be determined.
'''
cdef bytes bs
if name is None:
libgamma_group_name = <char*>NULL
return
bs = name.encode('utf-8') + bytes([0])
libgamma_group_name = bs
def libgamma_native_perror(name : str, error_code : int):
'''
Prints an error to stderr in a `perror` fashion,
however this function will not translate the `libgamma`
errors into human-readable strings, it will simply
print the name of the error. If the value `error_code`
is the value of `LIBGAMMA_ERRNO_SET`, `perror` will be
used to print the current error stored in `errno`.
If `error_code` is non-negative (an `errno` value`), that
value will be stored in `errno` and `perror` will be
used to print it. Additionally, if the `error_code` is
the value of `LIBGAMMA_DEVICE_REQUIRE_GROUP` the
required group will be printed with its numerical value
and, if known, its name.
@param name The text to add at the beginning.
@param value The error code, may be an `errno` value.
'''
cdef bytes bs
bs = name.encode('utf-8') + bytes([0])
libgamma_perror(bs, <int>error_code)
def libgamma_native_name_of_error(value : int) -> str:
'''
Returns the name of the definition associated with a `libgamma` error code.
@param value The error code.
@return The name of the definition associated with the error code,
`None` if the error code does not exist. The return string
should not be `free`:d.
'''
cdef const char* name
cdef bytes bs
name = libgamma_name_of_error(<int>value)
if name == NULL:
return None
bs = name
return bs.decode('utf-8', 'strict')
def libgamma_native_value_of_error(name : str) -> int:
'''
Return the value of a `libgamma` error definition refered to by name.
@param name The name of the definition associated with the error code.
@return The error code, zero if the name is `None`,
or does not refer to a `libgamma` error.
'''
cdef bytes bs
if name is None:
return 0
bs = name.encode('utf-8') + bytes([0])
return int(libgamma_value_of_error(bs))
