警告：忽略使用属性warn_unused_result声明的’realloc’的返回值

我很好奇，我正在使用PuTTy编写C语言 ，有谁知道我怎么能摆脱这个警告？

警告：忽略’realloc’的返回值，使用属性warn_unused_result声明[-Wunused-result] realloc（strp-> data，nbytes）;

^ 

它想要’警告’我的线的相关代码：

  //If the previously allocated size is > 0 then we can reallocate //otherwise we have to make a new allocation in memory if(strp->length > 0) { realloc(strp->data, nbytes); } else { *strp = kstralloc(nbytes); } 

提前致谢

Answer 1

调用realloc的正确方法是这样的：

 tmp = realloc(strp->data, nbytes); if (tmp == NULL) { // your realloc didn't work and strp->data still points to the // the original location return EMEMORY; } strp->data = tmp;