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struct msghdr
{
void *msg_name;
int msg_namelen;
struct iovec *msg_iov;
unsigned long msg_iovlen;
void *msg_control;
unsigned long msg_controllen;
unsigned msg_flags;
};
struct cmsghdr
{
socklen_t cmsg_len;
int cmsg_level;
int cmsg_type;
};
#define SO_DEBUG 1
#define SO_REUSEADDR 2
#define SO_TYPE 3
#define SO_ERROR 4
#define SO_DONTROUTE 5
#define SO_BROADCAST 6
#define SO_SNDBUF 7
#define SO_RCVBUF 8
#define SO_SNDBUFFORCE 32
#define SO_RCVBUFFORCE 33
#define SO_KEEPALIVE 9
#define SO_OOBINLINE 10
#define SO_NO_CHECK 11
#define SO_PRIORITY 12
#define SO_LINGER 13
#define SO_BSDCOMPAT 14
#define SO_RCVLOWAT 16
#define SO_SNDLOWAT 17
#define SO_RCVTIMEO 18
#define SO_SNDTIMEO 19
#define SO_PASSCRED 20
#define SO_PEERCRED 21
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