error strerror 函数 用法

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#include 
#include 
#include 

int main (void) {
	FILE* fp = fopen ("none", "r");
	if (! fp) {
		printf ("fopen: %d\n", errno);
		printf ("fopen: %s\n", strerror (errno));
		printf ("fopen: %m\n");
		perror ("fopen");
		return -1;
	}

	fclose (fp);

	return 0;
}

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