errshow.c

此源码是著名的教材BeginningLinux Programming中文名字叫Linux程序设计书中的源代码

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <errno.h>

FILE * open_file (char * filename)
{
	FILE	*stream;
	errno = 0;

	stream = fopen (filename, "r");
	if (stream == NULL)
	{
		printf ("can not open the file %s. reason: %s\n", filename, strerror(errno));
		exit (-1);	
	}
	else 
		return stream;
}

int main(void)
{
	char *filename = "test";

	open_file (filename);
	return 0;
}