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LINUXÄÚºËÖÐminºÍmaxºêµÄѧϰ

add linux kernel min, max define:
include/linux/kernel.h
/*
 * min()/max() macros that also do
 * strict type-checking.. See the
 * "unnecessary" pointer comparison.
 */
#define min(x,y) \
(__extension__\
({ \
        typeof(x) _x = (x);     \
        typeof(y) _y = (y);     \
        (void) (&_x == &_y);            \
        _x < _y ? _x : _y; })     \
)
#define max(x,y) \
(__extension__\
({ \
        typeof(x) _x = (x);     \
        typeof(y) _y = (y);     \
        (void) (&_x == &_y);            \
        _x > _y ? _x : _y; })     \
)
 
 
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2. ΪºÎÒªÓÃ({  })ÕâÑùµÄ½á¹¹°üΧ´úÂë¿é
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4. (void)(&_x == &_y)ÓÐʲôÓ㬲»ÊÇÍÑÁË¿ã×Ó·ÅÆ¨Ã´
 
 
 
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   ËùÒÔ×îºÃµÄ°ì·¨ÊDZÜÃâÔÚºêµÄʵÌåÀïÈòÎÊý³öÏÖÒ»´ÎÒÔÉÏ¡£ÀϵÄlinuxÓõÄÊÇ x>?y£¬Õâ¸ö>?²Ù×÷·ûÊÇ·µ»ØxºÍyÖнϴóµÄÒ»¸ö£¬²»¹ýGCCµÄÎĵµÀïÒѾ­¾ö¶¨ÅׯúÕâÖÖÀϵÄÓ÷¨ÁË¡£
 
 
2. GCCµÄÀ©Õ¹ÀïÏñ{ }ÕâÖֽṹҲÊÇ¿ÉÒÔÓÐÖµµÄ£¬ÆäÖµ¾ÍÊÇÆäÖÐ×îºóÒ»¸öÓï¾äµÄÖµ£¨°üÀ¨×óÖµ£©£¬ÕâÀïÍâÃæÔÙ¼Ó¸öÀ¨ºÅÊÇΪÁ˱£ÏÕ£¬±ÈÈ磺
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1. HCI²ãЭÒé¸ÅÊö£º
HCIÌṩһÌ×ͳһµÄ·½·¨À´·ÃÎÊBluetoothµ×²ã¡£ÈçͼËùʾ£º
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ÔÚHostÕâÒ»¶Ë£ºapplication,SDP,L2capµÈЭÒé ......

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sudo ifconfig eth0 down
sudo ifconfig eth0 up
sudo /etc/init.d/dhcp3-server restart
sudo /etc/init.d/networking restart
ÎÊÌâ½â¾öºÜ¼òµ¥£¬°ÑÈçϵĸ´Ñ¡¿ò¹´Éϼ´¿É£¬ÐéÄâ»ú¿ª» ......

ÔÚlinuxÏ »ñÈ¡£¬Ð޸ı¾»úIPµØÖ·µÄÁ½¸öº¯Êý

//»ñÈ¡±¾»úIPµØÖ·º¯Êý
QString GetLocalIp()
{
int sock_get_ip;
char ipaddr[50];
struct sockaddr_in *sin;
struct ifreq ifr_ip;
if ((sock_get_ip=socket(AF_INET, SOCK_STREAM, 0)) == -1)
{
printf("socket create failse...GetLocalIp!\n");
return ""; ......

Linux CÓïÑÔѧϰ±Ê¼Ç

1¡¢int    4×Ö½Ú
   long   8×Ö½Ú
   float  4×Ö½Ú
   double 8×Ö½Ú
   long double 16×Ö½Ú
2¡¢Ò»¸ö×Ö·û±äÁ¿Ö»ÄÜ´æ·ÅÒ»¸ö×Ö·û¡¢Ò»¸ö×Ö½Ú´æ·ÅÒ»¸ö×Ö½Ú
   char c;
   c = 'a';    c = '\034'   ......
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