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punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("len")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("<")]),t._v(" len "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n            "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("return")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Err")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("SystemError")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("::")]),s("span",{pre:!0,attrs:{class:"token constant"}},[t._v("EINVAL")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n        "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n\n        "),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// 加锁")]),t._v("\n        "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("let")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("mut")]),t._v(" inode"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("SpinLockGuard")]),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("<")]),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("RamFSInode")]),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v(">")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("self")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token number"}},[t._v("0")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("lock")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n\n        "),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// 检查当前inode是否为一个文件夹，如果是的话，就返回错误")]),t._v("\n        "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("if")]),t._v(" inode"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("metadata"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("file_type "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("==")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("FileType")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("::")]),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Dir")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n            "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("return")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Err")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("SystemError")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("::")]),s("span",{pre:!0,attrs:{class:"token constant"}},[t._v("EISDIR")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n        "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n\n        "),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// LAB TODO BEGIN")]),t._v("\n\n        "),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// LAB TODO END")]),t._v("\n\n        "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("return")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Ok")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("len"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n    "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n")])])]),s("h2",{attrs:{id:"实现-myramfs"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#实现-myramfs"}},[t._v("#")]),t._v(" 实现 myramfs")]),t._v(" "),s("blockquote",[s("p",[t._v("练习3：模仿 ramfs 实现 my_ramfs，并更正 ramfs")])]),t._v(" "),s("p",[t._v("原 ramfs 其实是有点小问题的，需要在 my_ramfs 更正后再测试，具体如下：")]),t._v(" "),s("h3",{attrs:{id:"open和close"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#open和close"}},[t._v("#")]),t._v(" open和close")]),t._v(" "),s("p",[t._v("测试代码中打开文件调用的"),s("code",[t._v("open")]),t._v("函数，最终会进行系统调用，在 "),s("strong",[t._v("kernel/src/syscall")]),t._v(" 中，标志是"),s("code",[t._v("SYS_OPEN")])]),t._v(" "),s("p",[s("img",{attrs:{src:a(294),alt:"图片1"}})]),t._v(" "),s("p",[t._v("检查文件路径正确后会调用同级目录下的 "),s("strong",[t._v("syscall.rs")]),t._v(" 中的 open 函数")]),t._v(" "),s("p",[t._v("测试代码中的关闭文件调用"),s("code",[t._v("close")]),t._v("函数也和 open 类似，标志为"),s("code",[t._v("SYS_CLOSE")]),t._v("，然后调用 "),s("strong",[t._v("syscall.rs")]),t._v(" 中的 close 函数")]),t._v(" "),s("p",[s("img",{attrs:{src:a(295),alt:"图片2"}})]),t._v(" "),s("p",[t._v("再看 "),s("strong",[t._v("kernel/vfs/mod.rs")]),t._v(" 的"),s("code",[t._v("IndexNode")]),t._v("接口中")]),t._v(" "),s("p",[s("img",{attrs:{src:a(296),alt:"图片3"}})]),t._v(" "),s("p",[t._v("如果文件系统没有具体实现 open 和 close 函数，就返回不支持，所以这就是出错的原因")]),t._v(" "),s("p",[s("strong",[t._v("解决方式：")])]),t._v(" "),s("p",[t._v("在我们模仿的 ramfs 文件系统里，添加 open 和 close 函数的具体实现，如下：")]),t._v(" "),s("div",{staticClass:"language-rust extra-class"},[s("pre",{pre:!0,attrs:{class:"language-rust"}},[s("code",[s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("fn")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token function-definition function"}},[t._v("open")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("&")]),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("self")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" _data"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("&")]),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("mut")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("FilePrivateData")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" _mode"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("&")]),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("super")]),s("span",{pre:!0,attrs:{class:"token module-declaration 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punctuation"}},[t._v("{")]),t._v("\n    "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("return")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Ok")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n")])])]),s("h3",{attrs:{id:"fopen"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#fopen"}},[t._v("#")]),t._v(" fopen")]),t._v(" "),s("p",[t._v("测试代码中我们用到了"),s("code",[t._v("fopen")]),t._v('来打开文件，第二个参数的"w+"的含义可以在 '),s("strong",[t._v("user/libs/libc/src/stdio.c")]),t._v(" 文件中查看，表示读写文件，并且如果文件不存在的话就创建这个文件")]),t._v(" "),s("p",[t._v("fopen 的系统调用也是 SYS_OPEN ，但是和 open 的区别在于：")]),t._v(" "),s("p",[s("img",{attrs:{src:a(297),alt:"图片4"}})]),t._v(" "),s("p",[t._v("fopen 在满足条件的情况下会调用"),s("code",[t._v("truncate")]),t._v("函数，这个函数和 open 、close 一样，也是定义在 "),s("strong",[t._v("vfs/mod.rs")]),t._v(" 中的 IndexNode 接口中，但是没有具体实现，需要文件系统自己实现，如下：")]),t._v(" "),s("p",[s("img",{attrs:{src:a(298),alt:"图片5"}})]),t._v(" "),s("p",[s("strong",[t._v("解决方式：")])]),t._v(" "),s("p",[t._v("所以需要在我们模仿的 ramfs 中，添加 truncate 的具体实现，如下：")]),t._v(" "),s("div",{staticClass:"language-rust extra-class"},[s("pre",{pre:!0,attrs:{class:"language-rust"}},[s("code",[s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("fn")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token function-definition function"}},[t._v("truncate")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("&")]),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("self")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" _len"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("usize")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("->")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Result")]),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("<")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("SystemError")]),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v(">")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n    "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("let")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token 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function"}},[t._v("printf")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token string"}},[t._v('"File opened successfully!\\n"')]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n    "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("const")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("char")]),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("*")]),t._v(" write_ptr "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token string"}},[t._v('"Write str here"')]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n    "),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("write")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("fd"),s("span",{pre:!0,attrs:{class:"token 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function"}},[t._v("close")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("fd"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n    "),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("printf")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token string"}},[t._v('"File closed successfully!\\n"')]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n\n    "),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("//测试open+close+read")]),t._v("\n    fd"),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("open")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token string"}},[t._v('"/ram/test_0/file_0.txt"')]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("O_WRONLY "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("|")]),t._v(" O_CREAT"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n    "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("if")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("fd"),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("<")]),s("span",{pre:!0,attrs:{class:"token number"}},[t._v("0")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n        "),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("printf")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token string"}},[t._v('"Open file failed!\\n"')]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n        "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("return")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n    "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n    "),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("printf")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token string"}},[t._v('"File opened successfully!\\n"')]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n    "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("char")]),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("*")]),t._v(" buf"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),s("span",{pre:!0,attrs:{class:"token number"}},[t._v("64")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n    "),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("read")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("fd"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("buf"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),s("span",{pre:!0,attrs:{class:"token number"}},[t._v("64")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n    "),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("printf")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token string"}},[t._v('"Having read:%s\\n"')]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("buf"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n    "),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("close")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("fd"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n    "),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("printf")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token string"}},[t._v('"File closed successfully!\\n"')]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n\n    "),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("//测试fopen+fclose+fputs")]),t._v("\n    "),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("printf")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token string"}},[t._v('"\\nTest fopen/fclose/fputs/fgets\\n"')]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n    FILE"),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("*")]),t._v(" file "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("fopen")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token string"}},[t._v('"/ram/test_1/file_0.txt"')]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),s("span",{pre:!0,attrs:{class:"token string"}},[t._v('"w+"')]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n    "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("if")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("file "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("==")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token constant"}},[t._v("NULL")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n        "),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("printf")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token string"}},[t._v('"Fopen file failed!\\n"')]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n        "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("return")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n    "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n    "),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("printf")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token string"}},[t._v('"File opened successfully!\\n"')]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n    "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("const")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("char")]),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("*")]),t._v(" fputs_ptr "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token string"}},[t._v('"Fputs str here"')]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n    "),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("fputs")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("fputs_ptr"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("file"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n    "),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("printf")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token string"}},[t._v('"Having fput: %s\\n"')]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("fputs_ptr"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n    "),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("fclose")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("file"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n    "),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("printf")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token string"}},[t._v('"File closed successfully!\\n"')]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n\n    "),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("//测试fopen+fclose+fgets")]),t._v("\n    file "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("fopen")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token string"}},[t._v('"/ram/test_1/file_0.txt"')]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),s("span",{pre:!0,attrs:{class:"token string"}},[t._v('"r+"')]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n    "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("if")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("file"),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("==")]),s("span",{pre:!0,attrs:{class:"token constant"}},[t._v("NULL")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n        "),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("printf")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token string"}},[t._v('"Fopen file failed!\\n"')]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n        "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("return")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n    "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n    "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("char")]),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("*")]),t._v(" buf1"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),s("span",{pre:!0,attrs:{class:"token number"}},[t._v("64")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n    "),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("fgets")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("buf1"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),s("span",{pre:!0,attrs:{class:"token number"}},[t._v("64")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("file"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n    "),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("printf")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token string"}},[t._v('"Having got: %s\\n"')]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("buf1"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n    "),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("fclose")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("file"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n    "),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("printf")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token string"}},[t._v('"File closed successfully!\\n"')]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n")])])])])}),[],!1,null,null,null);s.default=e.exports}}]);