软件简介

libjio是一个C库做日志，交易为导向的I/O它提供了一个类UNIX的文件操作功能（如打开，读取和写入）
，这是装在一个交易框架，以使文件操作可以提交或回滚是必要的。这是非侵入性，原子，和线程安全的，具有快速崩溃恢复。

示例代码：

include

include

include

include

include

include

define FILENAME “test1”

define TEXT “Hello world!\n”

int main(void)
{
int r;
struct jfs file;
struct jtrans trans;
struct jfsck_result result;

/ check the file is OK /
jfsck(FILENAME, NULL, &result);
jfsck_cleanup(FILENAME, NULL);

/ and open it /
r = jopen(&file, FILENAME, O_RDWR | O_CREAT | O_TRUNC, 0600, 0);
if (r < 0) {
perror(“jopen”);
return 1;
}

/ write two “Hello world”s next to each other /
jtrans_init(&file, &trans);
jtrans_add(&trans, TEXT, strlen(TEXT), 0);
jtrans_add(&trans, TEXT, strlen(TEXT), strlen(TEXT));
r = jtrans_commit(&trans);
if (r < 0) {
perror(“jtrans_commit”);
return 1;
}

/ at this point the file has “Hello world!\nHello world!\n” /

/ now we rollback /
r = jtrans_rollback(&trans);
if (r < 0) {
perror(“jtrans_rollback”);
return 1;
}

/ and now the file is empty! /

jtrans_free(&trans);
jclose(&file);
return 0;
}