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#include <sys/types.h>
#include <sys/socket.h>
ssize_t recv(int sock, void *buf, size_t len, int flags);
ssize_t recvfrom(int sock, void *buf, size_t len, int flags,
     struct sockaddr *from, socklen_t *fromlen);
ssize_t recvmsg(int sock, struct msghdr *msg, int flags);
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flags£ºÊÇÒÔÏÂÒ»¸ö»òÕß¶à¸ö±êÖ¾µÄ×éºÏÌ壬¿Éͨ¹ýor²Ù×÷Á¬ÔÚÒ»Æð
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#define SO_EE_ORIGIN_NONE    0
#define SO_EE_ORIGIN_LOCAL   1
#define SO_EE_ORIGIN_ICMP    2
#define SO_EE_ORIGIN_ICMP6   3
struct sock_extended_err
{
    u_int32_t ee_errno;   /* error number */
    u_int8_t ee_origin; /* where the error originated */
    u_int8_t ee_type;    /* type */
    u_int8_t ee_code;    /* code */
    u_int8_t ee_pad;
    u_int32_t ee_info;    /* additional information */
    u_int32_t ee_data;    /* other data */
    /* More data may follow */
};
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