文件操作 - ppp_defs.h
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文件: /usr/src/kernels/4.18.0-553.124.4.el8_10.x86_64/include/linux/ppp_defs.h
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/* * ppp_defs.h - PPP definitions. * * Copyright 1994-2000 Paul Mackerras. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * version 2 as published by the Free Software Foundation. */ #ifndef _PPP_DEFS_H_ #define _PPP_DEFS_H_ #include <linux/crc-ccitt.h> #include <uapi/linux/ppp_defs.h> #define PPP_FCS(fcs, c) crc_ccitt_byte(fcs, c) /** * ppp_proto_is_valid - checks if PPP protocol is valid * @proto: PPP protocol * * Assumes proto is not compressed. * Protocol is valid if the value is odd and the least significant bit of the * most significant octet is 0 (see RFC 1661, section 2). */ static inline bool ppp_proto_is_valid(u16 proto) { return !!((proto & 0x0101) == 0x0001); } #endif /* _PPP_DEFS_H_ */
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