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#include <sys/types.h>
#include <sys/socket.h>
int getsockopt
(int sock, int level, int optname, void *optval, socklen_t *optlen);
int setsockopt
(int sock, int level, int optname, const void *optval, socklen_t optlen);
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levelÖ¸¶¨¿ØÖÆÌ×½Ó×ֵIJã´Î.¿ÉÒÔÈ¡ÈýÖÖÖµ:
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