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FreeBSD 11.0 - man page for utrace (freebsd section 2)

UTRACE(2)						      BSD System Calls Manual							 UTRACE(2)

NAME
utrace -- insert user record in ktrace log
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <sys/param.h> #include <sys/time.h> #include <sys/uio.h> #include <sys/ktrace.h> int utrace(const void *addr, size_t len);
DESCRIPTION
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.
RETURN VALUES
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.
ERRORS
[EINVAL] Specified data length len was bigger than KTR_USER_MAXLEN. [ENOMEM] Insufficient memory to honor the request. [ENOSYS] Currently running kernel was compiled without ktrace(2) support (options KTRACE).
SEE ALSO
kdump(1), ktrace(1), ktrace(2)
HISTORY
The utrace() system call first appeared in FreeBSD 2.2.
BSD
November 1, 2014 BSD