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UTRACE(2)                DragonFly System Calls Manual               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/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.

     [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.

DragonFly 5.7-DEVELOPMENT      November 24, 2019     DragonFly 5.7-DEVELOPMENT

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