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/usr/include/net-snmp/library/snmpUDPBaseDomain.h is in libsnmp-dev 5.7.3+dfsg-1.8ubuntu3.

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#ifndef SNMPUDPBASEDOMAIN_H
#define SNMPUDPBASEDOMAIN_H

config_require(SocketBase)

#include <net-snmp/library/snmp_transport.h>

#ifdef __cplusplus
extern          "C" {
#endif

/*
 * "Constructor" for transport domain object.  
 */

    void netsnmp_udp_base_ctor(void);

/*
 * Prototypes
 */
    void _netsnmp_udp_sockopt_set(int fd, int local);
    int netsnmp_udpbase_recv(netsnmp_transport *t, void *buf, int size,
                             void **opaque, int *olength);
    int netsnmp_udpbase_send(netsnmp_transport *t, void *buf, int size,
                             void **opaque, int *olength);

#if defined(HAVE_IP_PKTINFO) || defined(HAVE_IP_RECVDSTADDR)
    int netsnmp_udpbase_recvfrom(int s, void *buf, int len,
                                 struct sockaddr *from, socklen_t *fromlen,
                                 struct sockaddr *dstip, socklen_t *dstlen,
                                 int *if_index);
    int netsnmp_udpbase_sendto(int fd, struct in_addr *srcip, int if_index,
                               struct sockaddr *remote, void *data, int len);
#endif

#ifdef __cplusplus
}
#endif

#endif /* SNMPUDPBASEDOMAIN_H */