其他

.10 在多線程程式中使用libpq    libpq的函數是安全執行緒的，可以在多線程程式中使用libpq。但編譯libpq共用庫時，必須使用特殊的選項才能保證產生的libpq共用庫是安全執行緒的。Libpq提供了一個特殊的函數PQisthreadsafe，應用程式可以調用這個函數確定自己使用的libpq共用庫是不是安全執行緒的。PQisthreadsafe返回1表示libpq共用庫是安全執行緒的，返回0表示libpq共用庫不是安全執行緒的.        int

文章目錄 Message StructureTransport TypesNAT vs. VoIPTransaction layer http://arstechnica.com/business/news/2010/01/voip-in-depth-an-introduction-to-the-sip-protocol-part-1.ars/2 In our last VoIP installment, we looked at the

                                 csdn lidp : http://blog.csdn.net/perfectpdl本文檔描述了怎樣在 Linux (Intel or ARM-based), Windows XP or Vista, or Mac OS X 10.5 (Leopard) 平台上下載及編譯 V8引擎。1. 準備：    所有平台都依賴的包：Subversion 1.4 or higher -

在Asterisk中對某個peer的類型分為3種:peer, user和friend看看voip-info對這三種類型的解釋peer : A SIP entity to which Asterisk sends calls (a SIP provider for example). If you want a user (extension) to have multiple phones, define an extension that calls two SIP peers. The

文章目錄 Registering multiple user devicesThe Via header, forking, loop preventionAn example using proxies User locationLet's step out of the SIP layers and see what we have so far: using the layers, we can now create and

1) Sonus requires all RTP packets (events or voice) to have unique timestamps. The RFCs specifically state that not only is it valid to use the same timestamp for various RTP packets, it is ideal in some cases (like events, for example). 2) The RFC 2

文章目錄 Offer-answer In Part 1 of our SIP primer, I covered the SIP foundation layers starting from the message structure and ending with the SIP transactions. We saw how phone registrations and proxies could work using

MessageDigest 類為應用程式提供資訊摘要演算法的功能，如 MD5 或 SHA 演算法。資訊摘要是安全的單向雜湊函數，它接收任意大小的資料，並輸出固定長度的雜湊值。 MessageDigest 對象開始被初始化。該對象通過使用 update（）方法處理資料。任何時候都可以調用 reset（）方法重設摘要。一旦所有需要更新的資料都已經被更新了，應該調用digest() 方法之一完成雜湊計算。 對於給定數量的更新資料，digest 方法只能被調用一次。在調用 digest

The Asterisk core handles these items internally:PBX Switching - The essence of Asterisk, of course, is a Private Branch Exchange Switching system, connecting calls together between various users and automated tasks. The Switching Core transparently

下述步驟建立一個TCP 連結：   1.伺服器必須準備好接受外部連結，通過調用soket, bind,listen 系統調用完成，稱為被動開啟   2. 用戶端通過調用 connect 進行主動開啟，這引起用戶端tcp發送一個SYN (synchronization)分節,他告訴伺服器用戶端將在待建立的串連中發送的資料的初始序號，比如 SYN j ,標示初始序號為 j,一般情況下SYN分節不帶資料，只包含一個ip頭部，一個tcp頭部及可能有的TCP選項（後續文章會詳細闡述）。   3.

Low Level Operators and Bit Fields   We have seen how pointers give us control over low level memory operations. Many programs (e.g. systems type applications) must actually operate at a low level where individual bytes must be operated on. NOTE:

Things can become more complex in scenarios other than those outlined above. For example, you might use PRACK (defined in RFC 3262), which is a provisional response acknowledgement. There are some cases in which we would like to guarantee the

1 general-header類：為描述訊息基本屬性的通用頭域，可用於請求訊息或響應訊息；通用頭域的網域名稱只有在協議版本改變時才可有效地擴充。不過，通訊中的所有方均認為是“通用頭域”的新的頭域也可認為是通用頭域。不被認可的頭域作為實體頭域。 1.1 Call-ID

一：列檔案清單 1． List (gdb) list line1,line2 二：執行程式 要想運行準備調試的程式，可使用run命令，在它後面可以跟隨發給該程式的任何參數，包括標準輸入和標準輸出說明符(<和>)和外殼萬用字元（*、？、[、]）在內。 如果你使用不帶參數的run命令，gdb就再次使用你給予前一條run命令的參數，這是很有用的。 利用set args 命令就可以修改發送給程式的參數，而使用show args 命令就可以查看其預設參數的列表。 （gdb）set args –

In this section will look at ways in which two processes can communicate. When a process terminates abnormally it usually tries to send a signal indicating what went wrong. C programs (and UNIX) can trap these for diagnostics. Also user specified

文章目錄 ABCs of VoIPKeeping with protocol Private Branch Exchange PBX hardware and softwareCan you hear me now? Codec compatibility Application in the real world Workplace integration Best Practices Conclusions

程式員必須讓擁有依賴關係的進程集協調，這樣才能達到進程的共同目標。可以使用兩種技術來達到協調。第一種技術在具有通訊依賴關係的兩個進程間傳遞資訊。這種技術稱做處理序間通訊（interprocess

#include "smtpd_mock.h"char* strsub (char *instr, unsigned start, unsigned end){ unsigned n = end - start; char * outstr = (char *)malloc(n+1); //bzero(outstr,n+1); strncpy (outstr, instr + start, n); outstr[n] = 0; return outstr;}int setnonblocking(

asctime（將時間和日期以字串格式表示）相關函數        time，ctime，gmtime，localtime表標頭檔        #include<time.h>定義函數        char * asctime(const struct tm * timeptr);函數說明       

構造 HTML/XML tokenizer [HTML]Document::createTokenizer() [HTML]Document::implicitOpen() FrameLoader::begin(const KURL&, bool dispatch, SecurityOrigin*) FrameLoader::receivedFirstData()Tokenizing HTML/XML documentFrom the moment, piece by