ufunc
Prints the symbol for a specified user space address. An alias for
usym
.
_usymaddr ufunc(uintptr_t)
The ufunc
function is a data recording function that prints the symbol that
corresponds to a specified user space address. The func
function is an alias
for usym
.
Example 7-61 How to use usym to obtain the symbol for an address
The example shows how to use theusym
function to return the
symbols for each openat
system call when running the
date command. The clause is predicated with a check that the process
ID matches the target process. The built-in ucaller
variable is used to
obtain a pointer to the location of the thread at the time the probe is
fired.sudo dtrace -n syscall::openat:entry'/pid == $target/{usym(ucaller);}' -c 'date'
Generates output similar to the following:
CPU ID FUNCTION:NAME
2 147861 openat:entry libc.so.6`_nl_find_locale
Mon 20 Feb 18:12:58 GMT 2023
2 147861 openat:entry 0x0