in_addr v.s. in_addr_t

There are lots function/macros designed to convert them :



in_addr_t      inet_addr(const char *cp);
in_addr_t      inet_lnaof(struct in_addr in);
struct in_addr inet_makeaddr(in_addr_t net, in_addr_t lna);
in_addr_t      inet_netof(struct in_addr in);
in_addr_t      inet_network(const char *cp);
char          *inet_ntoa(struct in_addr in);

In fact, both in_addr_t, in_addr is defined in netinet/in.h :

#ifndef _IN_ADDR_T

#define _IN_ADDR_T

typedef __uint32_t in_addr_t;

#endif

struct in_addr {

  in_addr_t s_addr;

};

Struct in_addr contain/hide detail of IP address, so if you need to record IP inside your program, use struct in_addr maybe a better idea then in_addr_t.







Reference : http://pubs.opengroup.org/onlinepubs/7908799/xns/arpainet.h.html

Unhandled Lockdown error (-15)

在一個對網路不友善的環境中....(略)

公司的 Linux build machine, 因為沒有登入公司網域, 要連外更新時都是很頭痛的問題, 然後又沒有無線網卡, 也沒法透過我 iPhone 分享的無線網路出去

上次意外發現 Ubuntu 11.10 內建 ipheth 之後, 就解決了這個問題, 透過 USB 走我的 iPhone 出去, 結果昨天晚上 iPhone 白蘋果, 復原後, 今天早上就發現接上去的時候有問題沒法出去了

錯誤的訊息是 : "Unhandled Lockdown error (-15)", 跟上次我遇到的問題不一樣 (上次更新 libimobiledevice 之後就可以動了)

Google 後發現了解法 :

1. 移除~/.config/libimobiledevice, 重新連接一次

2. 安裝 libimobiledevice-utils, 重新 pairing 一次 : idevicepair unpair && idevicepair pair

我做到第一步之後就解了, 要是第一步不行, 以現在沒法連接外網的情況, 我又要手動複製 .deb 了, 這就痛苦了

看了一下 ~/.config/libimobiledevice 下, 好像是些認證的檔案, 也許重刷後這些翻新了, 導致之前配對的過程要重來一次吧

Reference :

https://bugs.launchpad.net/ubuntu/+source/libplist/+bug/877440

Paulo (pauloerweber) wrote on 2011-11-18: #26

The unpair/pair commands worked on my iPad 1st Gen. Later to the commands, I removed ~/.config/libimobiledevice, rebooted the PC and only then connected the iPad (unlocked) on USB. After that, Ubuntu 11.10 was able to mount the iPad, even locked.


almadana (almadana) wrote on 2011-11-22: #27
sudo apt-get install libimobiledevice-utils
idevicepair unpair && idevicepair pair

在一個對網路不友善的環境中

在一個對網路不友善的環境中....(略)

repo 預設會啟動4個 sync thread, 對於我小小的3G連外頻寬是個吃重的負荷, 可以用 -j 指定要用幾個 thread 抓 :

repo sync -j 1

How to manually add a new user account by command line in Mac OSX Snow Leopard

sh-3.2# dscl . -create /Users/svnuser
sh-3.2# dscl . -create /Users/svnuser UserShell /bin/bash
sh-3.2# dscl . -passwd /Users/svnuser passwd
sh-3.2# dscl . -create /Users/svnuser RealName SvnUser
sh-3.2# dscl . -create /Users/svnuser UniqueID 510  
sh-3.2# dscl . -create /Users/svnuser PrimaryGroupID 80
sh-3.2# dscl . -create /Users/svnuser NFSHomeDirectory /Users/svnuser
sh-3.2# cp -R /System/Library/User\ Template/English.lproj/ /Users/svnuser
sh-3.2# chown -R svnuser:staff /Users/svnuser

Refer from :

http://serverfault.com/questions/20702/how-do-i-create-user-accounts-from-the-terminal-in-mac-os-x-10-5

http://osxdaily.com/2007/10/29/how-to-add-a-user-from-the-os-x-command-line-works-with-leopard/