insert user record in ktrace log
Adds a record to the process trace with information supplied by the user. The
record is identified by label and contains
len bytes from memory pointed to by
addr. This call only has an effect if the calling
process is being traced.
Upon successful completion, the value 0 is returned; otherwise the
value -1 is returned and the global variable
errno is set to indicate the error.
- The currently running kernel was compiled without
ktrace(2) support (option KTRACE).
- The length of the label string was longer than
- The specified data length len was bigger than
utrace() system call first appeared in
FreeBSD 2.2. It was added to
OpenBSD in OpenBSD 5.4. The
label argument is an extension.