implicit declaration of function ‘usleep’ [-Wimplicit-function-declaration]

这个错误提示表明在代码中使用了未声明的函数‘usleep’，导致出现了隐式声明错误。该错误可能是由于缺少对头文件'unisted.h'的包含引起的。 usleep函数是一个标准库函数，用于在微秒级别暂停程序的执行。要解决这个错误，可以在代码中包含'unisted.h'头文件，以便声明usleep函数。例如：
#include <unistd.h>
int main() {
usleep(1000);
return 0;
}<em>1</em><em>2</em><em>3</em>
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