NAME

     utrace — insert user record in ktrace log

LIBRARY

     Standard C Library (libc, -lc)

SYNOPSIS

     #include <sys/types.h>
     #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.