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| author | Rich Felker <dalias@aerifal.cx> | 2014-02-05 16:55:30 -0500 |
|---|---|---|
| committer | Rich Felker <dalias@aerifal.cx> | 2014-02-05 16:55:30 -0500 |
| commit | fdaaa68d827430caa930e4c966fa8d8a9f8f64c4 (patch) | |
| tree | 204e1429ecf0dfe0d88cc99b614f4baf564106ad | |
| parent | ad87c2eecf70c6f2852a4908b04a6329cbebaf7d (diff) | |
| download | musl-fdaaa68d827430caa930e4c966fa8d8a9f8f64c4.tar.gz musl-fdaaa68d827430caa930e4c966fa8d8a9f8f64c4.tar.xz musl-fdaaa68d827430caa930e4c966fa8d8a9f8f64c4.zip | |
add support for BSD struct tcphdr in netinet/tcp.h
there are two versions of this structure: the BSD version and the GNU version. previously only the GNU version was supported. the only way to support both simultaneously is with an anonymous union, which was a nonstandard extension prior to C11, so some effort is made to avoid breakage with compilers which do not support anonymous unions. this commit is based on a patch by Timo Teräs, but with some changes. in particular, the GNU version of the structure is not exposed unless _GNU_SOURCE is defined; this both avoids namespace pollution and dependency on anonymous unions in the default feature profile.
| -rw-r--r-- | include/netinet/tcp.h | 45 |
1 files changed, 41 insertions, 4 deletions
diff --git a/include/netinet/tcp.h b/include/netinet/tcp.h index 5639b89a..9be2b940 100644 --- a/include/netinet/tcp.h +++ b/include/netinet/tcp.h @@ -44,12 +44,24 @@ #define SOL_TCP 6 #include <sys/types.h> #include <sys/socket.h> -#endif +#include <endian.h> + +typedef u_int32_t tcp_seq; +#define TH_FIN 0x01 +#define TH_SYN 0x02 +#define TH_RST 0x04 +#define TH_PUSH 0x08 +#define TH_ACK 0x10 +#define TH_URG 0x20 + +struct tcphdr { #ifdef _GNU_SOURCE -#include <endian.h> -struct tcphdr -{ +#ifdef __GNUC__ + __extension__ +#endif + union { struct { + u_int16_t source; u_int16_t dest; u_int32_t seq; @@ -78,8 +90,33 @@ struct tcphdr u_int16_t window; u_int16_t check; u_int16_t urg_ptr; + + }; struct { +#endif + + u_int16_t th_sport; + u_int16_t th_dport; + u_int32_t th_seq; + u_int32_t th_ack; +#if __BYTE_ORDER == __LITTLE_ENDIAN + u_int8_t th_x2:4; + u_int8_t th_off:4; +#else + u_int8_t th_off:4; + u_int8_t th_x2:4; +#endif + u_int8_t th_flags; + u_int16_t th_win; + u_int16_t th_sum; + u_int16_t th_urp; + +#ifdef _GNU_SOURCE + }; }; +#endif }; +#endif +#ifdef _GNU_SOURCE #define TCPI_OPT_TIMESTAMPS 1 #define TCPI_OPT_SACK 2 #define TCPI_OPT_WSCALE 4 |