Process 无权访问由mkfifo创建的文件

当使用FIFO在不同进程之间传输信息时，我发现mkfifo创建的文件不能被进程访问。我不知道如何更改我的程序。请帮助：(

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如果阅读手册页，您会知道

O_create

是

mkfifo（）的无效参数。

：

mkfifo（）生成一个名为pathname的FIFO特殊文件。mode指定FIFO的权限。它由进程的umask以通常的方式修改：所创建文件的权限为（mode&~umask）

权限位标志在

中定义，可以通过阅读

stat（2）

的手册页在系统中查阅。以下是相关列表：

S_IRUSR    00400     owner has read permission
S_IWUSR    00200     owner has write permission
S_IXUSR    00100     owner has execute permission

S_IRGRP    00040     group has read permission
S_IWGRP    00020     group has write permission
S_IXGRP    00010     group has execute permission

S_IROTH    00004     others have read permission
S_IWOTH    00002     others have write permission
S_IXOTH    00001     others have execute permission

因此，通过将正确的权限标志传递给

mkfifo（）

，可以解决您的问题。如果您想要

rw rw

，则可以执行以下操作：

mkfifo("signal", S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH);

S_IRUSR    00400     owner has read permission
S_IWUSR    00200     owner has write permission
S_IXUSR    00100     owner has execute permission

S_IRGRP    00040     group has read permission
S_IWGRP    00020     group has write permission
S_IXGRP    00010     group has execute permission

S_IROTH    00004     others have read permission
S_IWOTH    00002     others have write permission
S_IXOTH    00001     others have execute permission

mkfifo("signal", S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH);