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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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level£ºÑ¡ÏîËùÔÚµÄЭÒé²ã¡£
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optlen£º¶ÔÓÚgetsockopt()£¬×÷ΪÈë¿Ú²ÎÊýʱ£¬Ñ¡ÏîÖµµÄ×î´ó³¤¶È¡£×÷Ϊ³ö¿Ú²ÎÊýʱ£¬Ñ¡ÏîÖµµÄʵ¼Ê³¤¶È¡£¶ÔÓÚsetsockopt()£¬ÏÖÑ¡ÏîµÄ³¤¶È¡£
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EFAULT£ºoptvalÖ¸ÏòµÄÄÚ´æ²¢·ÇÓÐЧµÄ½ø³Ì¿Õ¼ä
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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.¡¡
optnameÖ¸¶¨¿ØÖƵķ½Ê½(Ñ¡ÏîµÄÃû³Æ),ÎÒÃÇÏÂÃæÏêϸ½âÊÍ¡¡
optval»ñµÃ»òÕßÊÇÉèÖÃÌ×½Ó×ÖÑ¡Ïî.¸ù¾ÝÑ¡ÏîÃû³ÆµÄÊý¾Ý
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/*
  Name: SndKit.c
  Copyright: GPLv2
  Author: rockins(ybc2084@163.com)
  Date: 15-10-06 18:22
  Description: implent raw sound record/play
  run: ./SndKit [-h] [-d device] [-c channel] [-b bits] [-f hz] [-l len] <-r|-p file>
  e.g.:
  ./SndKit ......
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