20135234马启扬-——信息安全系统设计基础第十周学习总结

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#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>

#define BUFFERSIZE 4096
#define COPYMODE 0644

void oops(char *, char *);

int main(int argc, char *argv[])
{
int in_fd, out_fd, n_chars;
char buf[BUFFERSIZE];
if (argc != 3) {
fprintf(stderr, "usage: %s source destination\n", *argv);
exit(1);
}

if ((in_fd = open(argv[1], O_RDONLY)) == -1)
oops("Cannot open ", argv[1]);

if ((out_fd = creat(argv[2], COPYMODE)) == -1)
oops("Cannot creat", argv[2]);

while ((n_chars = read(in_fd, buf, BUFFERSIZE)) > 0)
if (write(out_fd, buf, n_chars) != n_chars)
oops("Write error to ", argv[2]);
if (n_chars == -1)
oops("Read error from ", argv[1]);

if (close(in_fd) == -1 || close(out_fd) == -1)
oops("Error closing files", "");
}

void oops(char *s1, char *s2)
{
fprintf(stderr, "Error: %s ", s1);
perror(s2);
exit(1);
}

20135234马启扬-——信息安全系统设计基础第十周学习总结

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原文地址：http://www.cnblogs.com/mqy123/p/4965861.html