如何获取errno值（C语言）的错误消息？

How can I get error message for errno value (C language)? For example, I can write such file (errno_messages.h):

如何获取errno值(C语言)的错误消息?例如,我可以编写这样的文件(errno_messages.h):

#include <errno.h>

char* get_errno_message(void){
    switch (errno) {
    case 0:
        return "";
        break;
    case EPERM:
        return "Operation not permitted";
        break;
    case ENOENT:
        return "No such file or directory";
        break;
    case ESRCH:
        return "No such process";
        break;
        /* e.t.c. */
    default:        
        break;
    }
}

But maybe such function is exists already?

但也许这种功能已经存在?

Best Regards

2 个解决方案

#1

I think what you're looking for is strerror().

我认为你要找的是strerror()。

#2

Aside of strerror(), a useful function is perror that also directly prints the error out with a given prefix. Often, you will want to do something like

除了strerror()之外,一个有用的函数是perror,它也直接用给定的前缀输出错误。通常,你会想要做类似的事情

int fd = open(filename, O_READ);
if (fd < 0) {
  perror(filename);
  exit(EXIT_FAILURE);
}

#1