动态共享库的生成
时间：2010-10-21 来源：Bean_lee
Lib.h
1 #ifndef LIB_H 2 #define LIB_H 3 4 5 void foobar(int i); 6 7 #endif _________________________________________________________ Lib.c 1 #include <stdio.h> 2 3 void foobar(int i) 4 { 5 printf("Printing From Lib.so %d\n",i) ; 6 sleep(-1); 7 8 } __________________________________________________________ program_1.c
1 #include "Lib.h" 2 3 int main() 4 { 5 foobar(1); 6 return 0; 7 } __________________________________________________________
root@libin:~/project/dso# ll 总用量 20 drwxr-xr-x 2 root root 4096 2010-10-21 22:58 ./ drwxr-xr-x 8 libin libin 4096 2010-10-21 22:17 ../ -rw-r--r-- 1 root root 99 2010-10-21 22:42 Lib.c -rw-r--r-- 1 root root 59 2010-10-21 22:18 Lib.h -rw-r--r-- 1 root root 58 2010-10-21 22:30 program_1.c
生成共享对象文件的命令 root@libin:~/project/dso# gcc -fPIC -shared -o Lib.so Lib.c -shared 表示生成共享对象 -fPIC 暂不解释
root@libin:~/project/dso# ll 总用量 28 drwxr-xr-x 2 root root 4096 2010-10-21 22:59 ./ drwxr-xr-x 8 libin libin 4096 2010-10-21 22:17 ../ -rw-r--r-- 1 root root 99 2010-10-21 22:42 Lib.c -rw-r--r-- 1 root root 59 2010-10-21 22:18 Lib.h -rwxr-xr-x 1 root root 6772 2010-10-21 22:59 Lib.so* -rw-r--r-- 1 root root 58 2010-10-21 22:30 program_1.c
这样在当前目录下就生成了共享对象文件Lib.so。这个共享对象文件包含foobar函数。
然后我们就可以编译链接我们的program_1.c root@libin:~/project/dso# gcc -o program program_1.c ./Lib.so root@libin:~/project/dso# ll 总用量 36 drwxr-xr-x 2 root root 4096 2010-10-21 23:00 ./ drwxr-xr-x 8 libin libin 4096 2010-10-21 22:17 ../ -rw-r--r-- 1 root root 99 2010-10-21 22:42 Lib.c -rw-r--r-- 1 root root 59 2010-10-21 22:18 Lib.h -rwxr-xr-x 1 root root 6772 2010-10-21 22:59 Lib.so* -rwxr-xr-x 1 root root 7134 2010-10-21 23:00 program* -rw-r--r-- 1 root root 58 2010-10-21 22:30 program_1.c
1 #ifndef LIB_H 2 #define LIB_H 3 4 5 void foobar(int i); 6 7 #endif _________________________________________________________ Lib.c 1 #include <stdio.h> 2 3 void foobar(int i) 4 { 5 printf("Printing From Lib.so %d\n",i) ; 6 sleep(-1); 7 8 } __________________________________________________________ program_1.c
1 #include "Lib.h" 2 3 int main() 4 { 5 foobar(1); 6 return 0; 7 } __________________________________________________________
root@libin:~/project/dso# ll 总用量 20 drwxr-xr-x 2 root root 4096 2010-10-21 22:58 ./ drwxr-xr-x 8 libin libin 4096 2010-10-21 22:17 ../ -rw-r--r-- 1 root root 99 2010-10-21 22:42 Lib.c -rw-r--r-- 1 root root 59 2010-10-21 22:18 Lib.h -rw-r--r-- 1 root root 58 2010-10-21 22:30 program_1.c
生成共享对象文件的命令 root@libin:~/project/dso# gcc -fPIC -shared -o Lib.so Lib.c -shared 表示生成共享对象 -fPIC 暂不解释
root@libin:~/project/dso# ll 总用量 28 drwxr-xr-x 2 root root 4096 2010-10-21 22:59 ./ drwxr-xr-x 8 libin libin 4096 2010-10-21 22:17 ../ -rw-r--r-- 1 root root 99 2010-10-21 22:42 Lib.c -rw-r--r-- 1 root root 59 2010-10-21 22:18 Lib.h -rwxr-xr-x 1 root root 6772 2010-10-21 22:59 Lib.so* -rw-r--r-- 1 root root 58 2010-10-21 22:30 program_1.c
这样在当前目录下就生成了共享对象文件Lib.so。这个共享对象文件包含foobar函数。
然后我们就可以编译链接我们的program_1.c root@libin:~/project/dso# gcc -o program program_1.c ./Lib.so root@libin:~/project/dso# ll 总用量 36 drwxr-xr-x 2 root root 4096 2010-10-21 23:00 ./ drwxr-xr-x 8 libin libin 4096 2010-10-21 22:17 ../ -rw-r--r-- 1 root root 99 2010-10-21 22:42 Lib.c -rw-r--r-- 1 root root 59 2010-10-21 22:18 Lib.h -rwxr-xr-x 1 root root 6772 2010-10-21 22:59 Lib.so* -rwxr-xr-x 1 root root 7134 2010-10-21 23:00 program* -rw-r--r-- 1 root root 58 2010-10-21 22:30 program_1.c
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