9.4. Accessing string data at a probe point

General syntax:

kernel_string:string (addr:long)

Copies a string from kernel space at a given address. The validation of this address is only partial.

General syntax:

user_string:string (addr:long)

This function copies a string from user space at a given address. The validation of this address is only partial. In rare cases when userspace data is not accessible, this function returns the string <unknown>.

General syntax:

user_string2:string (addr:long, err_msg:string)

This function is similar to user_string, (Section Section 9.4.2, “user_string”) but allows passing an error message as an argument to be returned if userspace data is not available.

General syntax:

user_string_warn:string (addr:long)

This function copies a string from userspace at given address. It prints a verbose error message on failure.

General syntax:

user_string_quoted:string (addr:long)

This function copies a string from userspace at given address. Any ASCII characters that are not printable are replaced by the corresponding escape sequence in the returned string.