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utrace - insert user record in ktrace log
Standard C Library (libc, -lc)
utrace(const void *addr, size_t len);
Adds a record to the process trace with information supplied by user.
The record 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
[EINVAL] Specified data length len was bigger than
[ENOMEM] Insufficient memory to honor the request.
[ENOSYS] Currently running kernel was compiled without
ktrace(2) support (options KTRACE).
kdump(1), ktrace(1), ktrace(2)
The utrace() system call first appeared in FreeBSD 2.2.