utrace — insert user record in ktrace log

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.

[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 (optionsKTRACE).

The utrace() system call first appeared in FreeBSD 2.2. Debian December 11, 2015 UTRACE(2)

Standard C Library (libc, -lc)

utrace — insert user record in ktrace log

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.

kdump(1), ktrace(1), truss(1), ktrace(2), sysdecode_utrace(3)

#include<sys/param.h>#include<sys/time.h>#include<sys/uio.h>#include<sys/ktrace.h>intutrace(constvoid*addr, size_tlen);