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
bytes from memory pointed to by
. 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.