警告：忽略使用属性warn_unused_result声明的“ realloc”返回值 [英] warning: ignoring return value of ‘realloc’, declared with attribute warn_unused_result

问题描述

我很好奇，我在PuTTy上的 C 中编程，有人知道我该如何摆脱这种警告？

I'm curious, I'm programming in C on PuTTy, does anyone know how I can get rid of this warning?

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

warning: ignoring return value of ‘realloc’, declared with attribute warn_unused_result [-Wunused-result] realloc(strp->data, nbytes);

                        ^

想要警告我的行的相关代码：

Relevant code to the line it wants to 'warn' me about:

         //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);
         }

预先感谢

推荐答案

调用realloc的正确方法是这样的：

The correct way to call realloc is something like this:

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;

这篇关于警告：忽略使用属性warn_unused_result声明的“ realloc”返回值的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！