【Linux系统调用】使用open、perror、read、write函数来复制文本文件

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#include <stdio.h> #include <unistd.h> #include <sys/types.h> #include <sys/stat.h> #include <fcntl.h>   int main(int argc,char *argv[]) {     int srcfd = open("English.txt", O_RDONLY);     if (srcfd == -1) {         perror("English.txt文件没有正确打开!出错原因");     }     int destfd = open("copyFile.txt", O_WRONLY | O_CREAT, 0644);     if (srcfd == -1) {         perror("copyFile.txt文件没有正确打开!出错原因");     }     char buf[1024] = {0};     int len = 0;     while ((len = read(srcfd, buf, 1024)) > 0) {         write(destfd, buf, len);     }     close(srcfd);     close(destfd);     return 0; }