micropython-lib/_libc/_libc.py

import ffi


_h = None

names = ('libc.so', 'libc.so.0', 'libc.so.6')

def get():
    global _h
    if _h:
        return _h
    err = None
    for n in names:
        try:
            _h = ffi.open(n)
            return _h
        except OSError as e:
            err = e
    raise err


def set_names(n):
    global names
    names = n
_libc: Helper FFI module to find and load proper libc for the system. It's needed because different LIBC implementation use different shared library names, so this module abstracts operation of finding the correct one. Default search order: 1. libc.so. This is usually doesn't exist, but user can create such symlink, and it will be used fast. 2. libc.so.0, as used by current uClibc versions. 3. libc.so.6, as used by current Glibc versions. uClibc is tried first because system where it is used are usually underpowered to do array of attempts. User can also override default search names by calling _libc.set_names(), (which should be called before importing any other modules). 2014-06-21 01:09:22 +00:00			`import ffi`


			`_h = None`

			`names = ('libc.so', 'libc.so.0', 'libc.so.6')`

			`def get():`
			`global _h`
			`if _h:`
			`return _h`
			`err = None`
			`for n in names:`
			`try:`
			`_h = ffi.open(n)`
			`return _h`
			`except OSError as e:`
			`err = e`
			`raise err`


			`def set_names(n):`
			`global names`
			`names = n`