o_rdonly
Applications shall specify exactly one of the first three values (file access modes) below in the value of oflag: O_RDONLY: Open for reading only. O_WRONLY: Open for writing only. O_RDWR: Open for reading and writing. The result is undefined if this flag ,O_RDONLY 以只读方式打开文件. O_WRONLY 以只写方式打开文件. O_RDWR 以可读写方式打开文件. 上述三种旗标是互斥的, 也就是不可同时使用, 但可与下列的旗标利用OR(|)运算符组合. O_CREAT 若欲打开的文件不存在则自动建立该文件. O_EXCL 如果O_CREAT 也被设置, 此指令会去检查文件是否存在. 文件若不存在则 ... ,Applications must specify exactly one of the first three values (file access modes) below in the value of oflag: O_RDONLY: Open for reading only. O_WRONLY: Open for writing only. O_RDWR: Open for reading and writing. The result is undefined if this flag i, pathname 参数是要打开或创建的文件名，和 fopen 一样， pathname 既可以是相对路径也可以是绝对路径。 flags 参数有一系列常数值可供选择，可以同时选择多个常数用按位或运算符连接起来，所以这些常数的宏定义都以 O_ 开头，表示or。 必选项：以下三个常数中必须指定一个，且仅允许指定一个。 O_RDONLY ..., 文件操作中的FLAG（O_RDONLY，O_WRONLY ）的值. 复制代码. #include <sys/types.h> #include <sys/stat.h> #include <fcntl.h> void main(void) printf("O_ACCMODE %08x-n", O_ACCMODE ) ; printf("O_RDONLY %08x-n", O_RDONLY ) ; printf("O_, O_RDONLY | O_WRONLY (at least on my Linux machine) is not the same thing as O_RDWR . #define O_RDONLY 00 #define O_WRONLY 01 #define O_RDWR 02. The fact that it works seems like a bug/feature/coincidence rather than "it works because it should work ,5 天前 - The argument flags must include one of the following access modes: O_RDONLY, O_WRONLY, or O_RDWR. These request opening the file read- only, write-only, or read/write, respectively. In addition, zero or more file creation flags and file status fla,#define _O_RDONLY O_RDONLY #define _O_WRONLY O_WRONLY #define _O_RDWR O_RDWR #define _O_APPEND O_APPEND #define _O_CREAT O_CREAT #define _O_TRUNC O_TRUNC #define _O_EXCL O_EXCL #define _O_TEXT O_TEXT #define _O_BINARY O_BINARY #define _O_NOINHERIT ..,Open/fcntl flags begin with O_; kernel-internal flags begin with F. */ /* open-only flags */ #define O_RDONLY 0x0000 /* open for reading only */ #define O_WRONLY 0x0001 /* open for writing only */ #define O_RDWR 0x0002 /* open for reading and writing */ #
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 o_rdonly 相關參考資料
open(3): open file - Linux man page
Applications shall specify exactly one of the first three values (file access modes) below in the value of oflag: O_RDONLY: Open for reading only. O_WRONLY: Open for writing only. O_RDWR: Open for rea... https://linux.die.net C语言open()函数：打开文件函数_C语言中文网
O_RDONLY 以只读方式打开文件. O_WRONLY 以只写方式打开文件. O_RDWR 以可读写方式打开文件. 上述三种旗标是互斥的, 也就是不可同时使用, 但可与下列的旗标利用OR(|)运算符组合. O_CREAT 若欲打开的文件不存在则自动建立该文件. O_EXCL 如果O_CREAT 也被设置, 此指令会去检查文件是否存在. 文件若不存在则 ... http://c.biancheng.net open - The Open Group Library
Applications must specify exactly one of the first three values (file access modes) below in the value of oflag: O_RDONLY: Open for reading only. O_WRONLY: Open for writing only. O_RDWR: Open for read... http://pubs.opengroup.org Linux系统调用之open(), close() - 乔部落格
pathname 参数是要打开或创建的文件名，和 fopen 一样， pathname 既可以是相对路径也可以是绝对路径。 flags 参数有一系列常数值可供选择，可以同时选择多个常数用按位或运算符连接起来，所以这些常数的宏定义都以 O_ 开头，表示or。 必选项：以下三个常数中必须指定一个，且仅允许指定一个。 O_RDONLY ... http://joe.is-programmer.com 文件操作中的FLAG（O_RDONLY，O_WRONLY ）的值- oucaijun - 博客园
文件操作中的FLAG（O_RDONLY，O_WRONLY ）的值. 复制代码. #include <sys/types.h> #include <sys/stat.h> #include <fcntl.h> void main(void) printf("O_ACCMODE %08x-n", O_ACCMODE ) ; printf(&q... http://www.cnblogs.com c++ - Using O_RDWR vs O_RDONLY | O_WRONLY - Stack Overflow
O_RDONLY | O_WRONLY (at least on my Linux machine) is not the same thing as O_RDWR . #define O_RDONLY 00 #define O_WRONLY 01 #define O_RDWR 02. The fact that it works seems like a bug/feature/coincid... https://stackoverflow.com open(2) - Linux manual page - man7.org
5 天前 - The argument flags must include one of the following access modes: O_RDONLY, O_WRONLY, or O_RDWR. These request opening the file read- only, write-only, or read/write, respectively. In additio... http://man7.org Copyright (C) 2009 DJ Delorie, see COPYING.DJ for details ...
#define _O_RDONLY O_RDONLY #define _O_WRONLY O_WRONLY #define _O_RDWR O_RDWR #define _O_APPEND O_APPEND #define _O_CREAT O_CREAT #define _O_TRUNC O_TRUNC #define _O_EXCL O_EXCL #define _O_TEXT O_TEXT ... http://www.delorie.com sysfcntl.h Source
Open/fcntl flags begin with O_; kernel-internal flags begin with F. */ /* open-only flags */ #define O_RDONLY 0x0000 /* open for reading only */ #define O_WRONLY 0x0001 /* open for writing only */ #de... http://unix.superglobalmegacor |