Thanks for your confirmation. There is another error when I compile libpcap-1.0.0-ring. The error is: " xscale-linux-gcc -O2 -fPIC -I. -I ../../kernel -I ../lib -DHAVE_CONFIG_H -D_U_="__attribute__((unused))" -c bpf_filter.c bpf_filter.c:1: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘.’ token make: *** [bpf_filter.o] Error 1 "
The content of bpf_filter.c is: link ./bpf/net/bpf_filter.c I have two questions: (1) What's the mean of this line in C language? (2) How to solve this error? Thanks! 在2010-05-07 17:29:15，"saxon elf" <[email protected]> 写道： Hi Sam: The rdtsc function used to get system time more precision which hardware system base on the Intel / AMD Arch. And this form of code " asm volatile("rdtsc":"=A" (a)); " not support ARM arch. And in the PF_RING kernel code, there have some preprocesser to use the rdtsc but the user space code does not use it, so if you compile the PF_RING kernel code successfully I think you can comment this line too. Good luck. Hi Luca, I comment the line about “asm” in pfring.c, and now the rdtsc() function becomes: " unsigned long long rdtsc() { unsigned long long a; // asm volatile("rdtsc":"=A" (a)); return(a); } " It can pass the compile. I have searched other *.h && *.c files, and there is no place to invoke rdtsc(). So I guess it doesn't matter to comment this line. But I still need your confirmation about my guess. Thanks very much! BR. Sam
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