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dus_ccc_plugin/add.c

@@ -0,0 +1,5 @@
+int add(int a,int b)
+{
+    return (a + b);
+}
+

dus_ccc_plugin/compile.sh

@@ -0,0 +1,7 @@
+#! /bin/bash
+#gcc -fPIC -shared source.c -o libsource.so
+gcc -fPIC -shared sub.c -o libsub.so
+gcc -fPIC -shared mul.c -o libmul.so
+gcc -fPIC -shared add.c -o libadd.so
+gcc -fPIC -shared div.c -o libdiv.so
+gcc -rdynamic -o test test.c -ldl

dus_ccc_plugin/div.c

@@ -0,0 +1,6 @@
+int div(int a, int b)
+{
+	if(b == 0)return -9999999;
+    return (a / b);
+}
+

dus_ccc_plugin/mul.c

@@ -0,0 +1,5 @@
+int mul(int a, int b)
+{
+    return (a * b);
+}
+

dus_ccc_plugin/source.c

@@ -0,0 +1,20 @@
+int add(int a,int b)
+{
+    return (a + b);
+}
+
+int sub(int a, int b)
+{
+    return (a - b);
+}
+
+int mul(int a, int b)
+{
+    return (a * b);
+}
+
+int div(int a, int b)
+{
+	if(b == 0)return -9999999;
+    return (a / b);
+}

dus_ccc_plugin/sub.c

@@ -0,0 +1,5 @@
+int sub(int a, int b)
+{
+    return (a - b);
+}
+

dus_ccc_plugin/test.c

@@ -0,0 +1,76 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <dlfcn.h>
+
+//动态链接库路径
+//#define LIB_CACULATE_PATH "./libsource.so"
+#define LIB_MUL "./libmul.so" // '*'
+#define LIB_SUB "./libsub.so" // '-'
+#define LIB_ADD "./libadd.so" // '+'
+#define LIB_DIV "./libdiv.so" // '/'
+ //函数指针
+typedef int (*CAC_FUNC)(int, int);
+
+int main(){
+    void *handle;
+    char *error;
+	//char *lib_name = LIB_CACULATE_PATH
+    CAC_FUNC cac_func = NULL;
+	char lib_name[4][15] ={LIB_ADD,LIB_SUB,LIB_MUL,LIB_DIV};
+	int a,b;
+	char c;
+	char opt[4][4]={"add","sub","mul","div"}; 
+	int opt_flag;
+	int exit_flag = 1;
+	do{
+		scanf("%d%c%d",&a,&c,&b);
+		switch(c){
+			case '+':
+				//char *lib_name = LIB_ADD;
+				//打开动态链接库
+				//opt = "add";
+				opt_flag = 0;
+				handle = dlopen(lib_name[opt_flag], RTLD_LAZY);
+				break;
+			case '-':
+				//char *lib_name = LIB_SUB;
+				//opt = "sub";
+				opt_flag = 1;
+				handle = dlopen(lib_name[opt_flag], RTLD_LAZY);
+				break;
+			case '*':
+				//char *lib_name = LIB_MUL;
+				//opt = "mul";
+				opt_flag = 2;
+				handle = dlopen(lib_name[opt_flag], RTLD_LAZY);
+				break;
+			case '/':
+				//char *lib_name = LIB_DIV;
+				//opt = "div";
+				opt_flag = 3;
+				handle = dlopen(lib_name[opt_flag], RTLD_LAZY);
+				break;
+			default:
+				printf("exit\n");
+				exit_flag = 0;
+			break;
+		}
+		if (!handle) {
+			//fprintf(stderr, "%s\n", dlerror());
+			printf("load %s error!\n",lib_name[opt_flag]);
+			//exit(EXIT_FAILURE);
+			continue;
+		}
+		//清除之前存在的错误
+		dlerror(); 
+		//获取函数
+		*(void **) (&cac_func) = dlsym(handle, opt[opt_flag]);
+		printf("%d %c %d = %d\n",a,c,b,(*cac_func)(a,b));
+		//关闭动态链接库
+		if (handle)
+			dlclose(handle);
+		//exit(EXIT_SUCCESS);
+	}while(exit_flag != 0);
+	return 0;
+}
+