errno.c

scounix编译通过,c/s完整实现

/*检查errno和perror的使用*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
extern int	errno ;

void main(int argc, char *argv[])
{
	int n_char = 0, buffer[10];
	printf("n_char = %d\t errno +%d \n", n_char, errno);
	n_char = write(1, "Enter a word ", 14);
	n_char = read(3, buffer, 10);
	printf("\nn_char = %d \t errno = %d \n", n_char, errno);
	if ( n_char == -1)
	{
		perror(argv[0]);
		exit(1);
	}

	n_char = write(1, buffer, n_char);
}