如何在Linux内核模式下将'\\ n'传递到文件中

Question

I write into a file const char *prefix

vfs_write(filp, prefix, strlen(prefix), &os);
   pos = pos + strlen(prefix);

But it has no '\\n' at the end. I tried to write

vfs_write(filp, '\n', strlen('\n'), &os);
   pos = pos + strlen('\n');

or

vfs_write(filp, 0xAD, strlen(0xAD), &os);
   pos = pos + strlen(0xAD);

or

vfs_write(filp, 0xAD, 1, &os);
   pos = pos + 1;

but it doesn't work.

How should i do that?

Answer 1

尝试使用字符串“ \\ n”而不是字符“ \\ n”。

Answer 2

The newline character is not a string, it's a character . The function wants a pointer to a buffer of bytes (characters) and by providing a character literal you tell the function to use that character as a pointer, so it will read from address '\\n' (ie address 0x0a) which do not contain a valid string.

Instead do eg vfs_write(filp, "\\n", 1, &os);

The string literal "\\n" is a pointer to an constant array of characters, in other words a pointer to a buffer of bytes.