struct timeval now, last;
正確用法：gettimeofday(&now, NULL);
錯誤：缺少參數，gettimeofday(&now); ，這會影響其他的timeval資料，可能會寫到 last 變數裡(寫入值可能是：20 FE FF FF)。
2009年9月25日 星期五
2009年9月24日 星期四
sizeof timeval
Tested:
sizeof(struct timeval) =16 bytes on CentOS 64-bit
sizeof(struct timeval) = 8 bytes on Fedora 9 32-bit
2009年9月22日 星期二
FreeBSD ipfw 欄位
FreeBSD ipfw column.
ipfw show
Index Packets Bytes Rule
----- ------- -------- ----------------------------------------------------------
00050 464266 61021795 count udp from any to any via 192.168.1.99
00051 56582 79785701 count tcp from 192.168.1.99 80 to any via 192.168.1.99
65533 3 144 count tcp from 192.168.1.95 to 192.168.1.99 dst-port 23 in
- Packets: How many packets counted.
- Bytes: How many bytes counted. (e.g. The index 65533, 20bytes(IP)+28bytes(TCP)=48bytes, 48*3=144bytes)
2009年9月19日 星期六
to increase PJSUA_MAX_CALLS, PJ_IOQUEUE_MAX_HANDLES
centos 5.3
compiling "pjproject-1.4": (PJSUA_MAX_CALLS, PJ_IOQUEUE_MAX_HANDLES)
cp pjproject-1.4/pjlib/include/pj/config_site.sample.h pjproject-1.4/pjlib/include/pj/config_site.h
vim pjproject-1.4/pjlib/include/pj/config_site.h
#define PJ_CONFIG_MAXIMUM_SPEED 1
Compiling Error:
PJ_IOQUEUE_MAX_HANDLES cannot be greater than FD_SETSIZE
/etc/security/limits.conf
* soft nofile 99999
* soft nofile 99999
[root@ip172 i686-pc-linux-gnu]# grep -R FD_SETSIZE /usr/include/* |grep 1024
/usr/include/bits/typesizes.h:#define __FD_SETSIZE 1024
/usr/include/linux/posix_types.h:#define __FD_SETSIZE 1024
/usr/include/valgrind/vki-linux.h:#define __VKI_FD_SETSIZE 1024
vim /usr/include/bits/typesizes.h
/usr/include/bits/typesizes.h:#define __FD_SETSIZE 10240
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