daemon.py 文件源码

def setugid(user):
    """Change process user and group ID

    Argument is a numeric user id or a user name"""
    try:
        from pwd import getpwuid
        passwd = getpwuid(int(user))
    except ValueError:
        from pwd import getpwnam
        passwd = getpwnam(user)

    if hasattr(os, 'initgroups'): # python >= 2.7
        os.initgroups(passwd.pw_name, passwd.pw_gid)
    else:
        import ctypes
        if ctypes.CDLL(None).initgroups(passwd.pw_name, passwd.pw_gid) < 0:
            err = ctypes.c_int.in_dll(ctypes.pythonapi,"errno").value
            raise OSError(err, os.strerror(err), 'initgroups')
    os.setgid(passwd.pw_gid)
    os.setuid(passwd.pw_uid)
    os.environ['HOME'] = passwd.pw_dir