utrace(2)

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, sizet_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

The function returns the value 0 if successful; 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 December 28, 2000

BSD