實作一個跨平台的mysock庫（windows、linux）源代碼下載下傳 1.首先确定自己的作業系統為32位還是64位： 2.編寫測試程式： 3.跨平台代碼分析



root@bfq:~/mysock# uname -a

linux bfq 3.11.0-26-generic#45~precise1-ubuntu smp tue jul 15 04:02:35 utc 2014x86_64x86_64 x86_64 gnu/linux

root@bfq:~/mysock# vim test.c

編譯、執行：

root@bfq:~/mysock# gcc test.c

root@bfq:~/mysock# file a.out

a.out: elf64-bitlsb executable, x86-64, version 1 (sysv), dynamically linked (uses sharedlibs), for gnu/linux 2.6.24,buildid[sha1]=0x69d02236045c81b597e24cb143cfca5909987b80,

not stripped

root@bfq:~/mysock# ./a.out

sizeof(char *)=8

root@bfq:~/mysock# gcc test.c-m32

a.out: elf32-bitlsb executable, intel 80386, version 1 (sysv), dynamically linked (uses sharedlibs), for gnu/linux 2.6.24,buildid[sha1]=0x668431a373c94667857a83c2d92929e8b57cff58,

sizeof(char *)=4

 使用-m32來使得gcc編譯32位程式（在x86_64系統上），使用-m elf_i386參數可以使得64位的ld能夠相容32位的庫 

編譯：

root@bfq:~/mysock#ls

libmysock64.so makefile-lib32 makefile-lib64  makefile-win mysock.c  mysock.h

root@bfq:~/mysock#make -f makefile-lib32

gcc-wall -d__unix -g -m32 -fpic -o mysock.o -c mysock.c

gcc -m32 -shared -o libmysock32.so mysock.o

root@bfq:~/mysock#file libmysock32.so

libmysock32.so:elf32-bit lsb shared object, intel 80386,version 1 (sysv), dynamically linked,buildid[sha1]=0x18b8a6de746679cccfb10306d6bc62955e3566f4,

root@bfq:~/mysock#

root@bfq:~/mysock#make -f makefile-lib64

gcc-wall -d__unix -g -fpic -o mysock.o -c mysock.c

gcc-shared -o libmysock64.so mysock.o

libmysock64.so makefile-lib32 makefile-lib64  makefile-win mysock.c  mysock.h mysock.o

root@bfq:~/mysock#file libmysock64.so

libmysock64.so:elf64-bit lsb shared object, x86-64, version 1(sysv), dynamically linked,buildid[sha1]=0xbec5736775c33f27fe81e88c98f1c26a1edf97b9,

源碼結構：

linux

windows

各種平台的makefile

利用vs開發工具本身可以編譯出lib和dll。

mysock.h

mysock.c