linux创建动态库

/*************************************************************************
> File Name: sharelib.c
> Author: copener
> Mail: hanmingye@foxmail.com
> Created Time: 2015年05月14日 星期四 09时03分18秒
************************************************************************/ #include<stdio.h>
/*
*插入法排序函数
*输入参数:*array是将要排序的数组，length是元素的长度
* */
void insert_sort(int *array, int length){
int i,j;
for(i=; i<length; i++){
int temp;
j=i;
temp = array[j]; while(j>){
if(temp < array[j-]){
array[j]=array[j-];
j--;
}else{
break;
} array[j] = temp;
}
}
return;
} /*
*二分法查找函数
*输入参数:*array是将要查找的数组，item是要查找的元素，length是元素的长度
* */
int binary_search(int *array, int item, int length){
int high, low, mid;
high = length;
low = ;
mid = (high + low)/; while(low < high){
printf("high:%d low:%d mid:%d\r\n",high,low,mid);
if(array[mid] > item){
if(low==(high-) || high == mid ){
return -;
}
printf("array[%d]>%d\r\n",mid,item);
high = mid;
mid = (high + low)/; }else if(array[mid]<item){
if(low==mid || high == (low+)){
return -;
}
printf("array[%d]<%d\r\n",mid,item);
low = mid;
mid = (high + low)/; }else{
return mid;
}
}
return -;
}

oee@copener:~/workspace/test/sharelib$ gcc -shared -fPIC -o sharelib.so sharelib.c
oee@copener:~/workspace/test/sharelib$ ls
sharelib.c sharelib.so

//关于gcc 中的-shared 参数
-shared
Produce a shared object which can then be linked with other objects to form an executable. Not all systems support this option. For
predictable results, you must also specify the same set of options used for compilation (-fpic, -fPIC, or model suboptions) when you
specify this linker option.[] //-shared会与-fPIC参数一起使用来生成动态库文件

/*************************************************************************
> File Name: sharelib.h
> Author: copener
> Mail: hanmingye@foxmail.com
> Created Time: 2015年05月14日 星期四 11时23分18秒
************************************************************************/ extern void insert_sort(int *array, int length);
extern int binary_search(int *array, int item, int length);
extern void bubble_sort(int * array, int length);

/*************************************************************************
> File Name: testapp.c
> Author: copener
> Mail: hanmingye@foxmail.com
> Created Time: 2015年05月14日 星期四 11时25分46秒
************************************************************************/ #include<stdio.h>
#include "sharelib.h" int main(void){
int item;
int pos;
int i;
int array[] ={,,,,}; //排序
insert_sort(array, );
for(i=; i<; i++){
printf("%d ",array[i]);
} //二分法查找
printf("\r\nplease input a number:\r\n");
scanf("%d", &item); pos = binary_search(array, item, );
if(pos == -){
printf("can't find or data not sort!\r\n");
}
else{
printf("done! the position is %d\r\n",(pos+));
} return ;
}

oee@copener:~/workspace/test/sharelib$ gcc -o testapp testapp.c ./sharelib.so
oee@copener:~/workspace/test/sharelib$ ls
sharelib.c sharelib.h sharelib.so testapp testapp.c

oee@copener:~/workspace/test/sharelib$ ./testapp please input a number: input end, processing...
high: low: mid:
array[]>
high: low: mid:
done! the position is