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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{
int sock_mac;
struct ifreq ifr_mac;
char mac_addr[30];
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if( sock_mac == -1)
{
perror("create socket falise...mac\n");
return "";
}
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