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int fd; // 文件描述符 char buf[100]; 想从 fd 读取 50 字节放到 buf 里，但是起始位置不是 0, 该咋写 不要申请额外的内存，然后拷贝到 buf 里
 | 1 htfy96 Apr 9, 2018 fseek |
 | 2 choury Apr 9, 2018 read(fd, buf+50, len) |
 | 3 pkookp8 Apr 10, 2018 via Android man 2 open man lseek man fopen man fseek |
 | 4 Andiry Apr 10, 2018 pread 了解一下 |
 | 5 liuminghao233 Apr 10, 2018 via iPhone 传指针的时候用 buf+50 |
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