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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:
1)SOL_SOCKET:ͨÓÃÌ×½Ó×ÖÑ¡Ïî.
2)IPPROTO_IP:IPÑ¡Ïî.
3)IPPROTO_TCP:TCPÑ¡Ïî.¡¡
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Disk /dev/sda: 160.0 GB, 160040803840 bytes
255 heads, 63 sectors/track, 19457 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
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