在intel的linux的小端機上進行大端編譯1 sigwait() requires one more parameter in Linux.函數參數不同
dbftam_signal= sigwait(&sigset);--- solaris
retval = sigwait(&sigset,&dbftam_signal); ---linux
2 signal 變成sigaction
(void) signal( SIGALRM, ITsigalrm ); --solaris
(void)sigaction(SIGALRM, &sigcntl, (struct sigaction*)NULL);----linux
3 strlcpy()is not defined in Linux. (linux solaris 函數名不同)#ifdef APXAPLINUX
#define strlcpy(dst, src, dstsize) strncpy(dst, src, dstsize)
#endif
4 cftime()is not defined in Linux. 函數名不同#if !defined(APXAPLINUX)
cftime(timeBuf,"%D %T", (const time_t *) ×tamp);
#else /* defined(APXAPLINUX) */
strftime(timeBuf,sizeof(timeBuf), "%D %T", localtime((const time_t *)&DBinuse[dbid].timestamp));
#endif
5 #ifdefAPXAPLINUX 頭文件不同
#include<strstream>
#else
#include<strstream.h>
#endif
6 帶地址的變量 (變成 小端地址定義變量)
• msgrcvreturn only the 4th parameter matches. Need change
• unsignedlong all; /* References the whole word. */
• to
• unsignedlong all; __attribute__((littleendian));
int request __attribute__((littleendian));
scanf("%d",&request);定義小端變量。因為c庫是小端編譯的。小端存（放入內存），小端讀。c庫是 小端編譯。返回值是小端存儲。
notes: int ret_code;
ret_code = SUCCESS;
fprintf(STDERR, "ERROR: send_reorig: send message to ap fail %d\n", ret_code);
fprintf也是c庫函數，但是它的入參，可以大端，可以小端。不用轉7 字節對齊
longlong in Linux• Needto add more padding fields for Linux.
• Codepattern• typedefstruct t_size{
• long f1;
• long long f2;
• }T_SIZE;
• Iccbuild results:• Noerror or warning detected by icc
• Runningresult:• Solaris:sizeof(T_SIZE) = 16
• Linux:sizeof(T_SIZE) = 12
• Solution:• Addpadding fields
• typedefstruct t_size{
• long f1;
• #ifdefAPXAPLINUX
• Long padding;
• #endif
• long long f2;
• }T_SIZE;
8 將int變成socklen_t
#ifndef APXAPLINUX
extern int errno;-----------solaris沒有 這個global變量，linux有
#endif
9 4.1.6 solaris 沒有(__sighandler_t)
#ifdef APXAPLINUX
signal(UXSIG_DEBUG,(__sighandler_t)UXtog_trap_signal);
#else
signal(UXSIG_DEBUG,UXtog_trap_signal);
#endif
Notes: __sighandler_t is notaccepted by sparc build.
11 last parameter in pthread_create 參數不匹配
rc= pthread_create(&id, &attr, (OURTYPE) _UX_thread_entry, (void *) p);
12
// intitalize to hold given restrictions
tcpaddr.sin_addr.s_addr = htonl(INADDR_ANY);
tcpaddr.sin_port = htons(port);
// make bindcall
if ( (retVal= bind(m_scktNum, reinterpret_cast<struct sockaddr *>(&tcpaddr), sizeof(tcpaddr) )) < 0 ) {
ELOG((char*)"CISipSckt::bindToPort(). bind() call failed. Error: %d, %s, port: %d \n", errno, ( strerror(errno) ),port);
}
bind等網絡函數是大端函數，要的就是大端的變量，所以用htonl。如果是大端，這個函數不轉。如果是小端，這個函數會轉.
//理解為rcvaddr是大端編譯的變量
struct sockaddr_in rcvaddr;
//recvfrom是網絡函數，用大端編譯變量
pktLen =recvfrom(dhcpScktNum, dhcpMsgBufPtr, bytesToRead, 0, (struct sockaddr*)&rcvaddr, &rcv_addrlen);
13 : //這個和extern道理一樣，告訴編譯器，入參要變成小端。因為是void *p ，不能確定是類型.如果是char *p;則無所謂.
#ifdef LINUX
#pragma byte_order(push,littleendian)
#endif
void *
createClientThMain(void *arg)
#ifdef LINUX
#pragma byte_order(pop)
#endif
同理，非char*
char* convertDecimalToString(short i);
14 test 大小端的程序
union裡的數據都是從同一個地址的低端開始放置,而長度大於1字節的類型需要考慮大小端(只有char不用考慮大小端)
union
{
charstr;
intdata;
};
data=0x01020304;
if(str==0x01)
{
cout<< "the meachine is big-endian"<<endl;
}
elseif(str==0x04){
cout<<"the meachine is little endia"<<endl;
}