如果 offset 比文件的当前长度更大，下一个写操作就会把文件“撑大（extend）”。这就是所谓的在文件里创造“空洞（hole）”。没有被实际写入文件的所有字节由重复的 0 表示。空洞是否占用硬盘空间是由文件系统（file system）决定的。编辑本段 程序例 include <stdio.h> include <stdlib.h> include...
NAME SYNOPSIS #include <sys/types.h> #include <unistd.h> off_t lseek(intfildes, off_toffset, intwhence); LearnLinux/Unixin-depth with real-world projects through ourLinux/Unix certification course. Enroll and become a certified expert to boost your career. ...
When you develop in C-based languages and an application is compiled with the _LARGE_FILES macro defined, thelseek()API will be mapped to a call to thelseek64()API. Additionally, the data type off_t will be mapped to the type off64_t. ...
In particular, I suspect qemu-img convert -S 0 ... will reproduce this going fast for you in both cases, since ZFS's own notions of compression will eat regions of zeroes just as well as qemu-img scanning for them. 👍 1 Author...
When you develop in C-based languages and an application is compiled with the _LARGE_FILES macro defined, thelseek()API will be mapped to a call to thelseek64()API. Additionally, the data type off_t will be mapped to the type off64_t. ...
When you develop in C-based languages and an application is compiled with the _LARGE_FILES macro defined, the lseek() API will be mapped to a call to the lseek64() API. Additionally, the data type off_t will be mapped to the type off64_t. Using this function with the write(), pw...
When you develop in C-based languages and an application is compiled with the _LARGE_FILES macro defined, the lseek() API will be mapped to a call to the lseek64() API. Additionally, the data type off_t will be mapped to the type off64_t. Using this function with the write(), pw...
When you develop in C-based languages and an application is compiled with the _LARGE_FILES macro defined, the lseek() API will be mapped to a call to the lseek64() API. Additionally, the data type off_t will be mapped to the type off64_t. Using this function with the write(), pw...
When you develop in C-based languages and an application is compiled with the _LARGE_FILES macro defined, the lseek() API will be mapped to a call to the lseek64() API. Additionally, the data type off_t will be mapped to the type off64_t. Using this function with the write(), pw...
When you develop in C-based languages and an application is compiled with the _LARGE_FILES macro defined, the lseek() API will be mapped to a call to the lseek64() API. Additionally, the data type off_t will be mapped to the type off64_t. Using this function with the write(), pw...