UTRACE(2) System Calls Manual UTRACE(2)
utrace -- insert user record in ktrace log
Standard C Library (libc, -lc)
utrace(const char *label, void *addr, size_t len);
Adds a record to the process trace with information supplied by 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, a value of 0 is returned. Otherwise, a value
of -1 is returned and errno is set to indicate the error.
[ENOSYS] Currently running kernel was compiled without
ktrace(2) support (option KTRACE).
[EINVAL] Specified data length len was bigger than
kdump(1), ktrace(1), ktruss(1), fktrace(2), ktrace(2), options(4)
The utrace() system call first appeared in FreeBSD 2.2. It was added to
NetBSD in NetBSD 1.6. The label argument is a NetBSD extension.
NetBSD 6.1.5 December 28, 2000 NetBSD 6.1.5