shm_open()函数无此文件或目录 [英] shm_open() function no such file or directory

问题描述

我正在尝试使用shm_open()创建一个新的共享内存文件，但是却出现了errno 2(无此文件或目录).

I'm trying to create a new shared memory file using shm_open(), but I'm getting errno 2 (No such file or directory).

shm_open ("/DIAG_public", O_CREAT | O_RDWR, S_IWUSR | S_IRUSR | S_IWGRP | S_IRGRP | S_IROTH);

我尝试创建自己的独立应用程序，以使用相同的名称和选项运行shm_open，并且此 成功...

I've tried creating my own standalone app to run shm_open with the same name and options, and this is successful...

因此请检查/dev/shm是否具有drwxrwxrwt权限，以及运行实际代码的进程是否具有-rwxrwxrwx权限.

So checked that /dev/shm has drwxrwxrwt permissions and that the process running the actual code has -rwxrwxrwx permissions.

此外，mount | grep shm返回:

tmpfs on /dev/shm type tmpfs (rw)

我没有主意...关于可能出什么问题的任何建议?

I'm out of ideas... any suggestions on what could be going wrong?

谢谢.

推荐答案

请确保您实际上正在传递O_CREAT.唯一的错误似乎就是这个错误.

Make sure that you are actually passing O_CREAT. Only that seems to be giving this error.

手册页显示ENOENT仅在两种情况下返回.对于shm_open，尽管只有第一个似乎有效.

Man page says ENOENT is returned only under two conditions. For shm_open only first one seems to be valid though.

man shm_open
ERRORS
       On failure, errno is set to indicate the cause of the error.  Values which may appear in errno include the following:

    ...

        ENOENT An attempt was made to shm_open() a name that did not exist, and O_CREAT was not specified.

        ENOENT An attempt was to made to shm_unlink() a name that does not exist.

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