uaddr

Prints the symbol for a specified address.

_usymaddr uaddr(uintptr_t)

The uaddr function prints the symbol for a specified address, including hexadecimal offset, which enables the same symbol resolution that ustack provides.

Example 8-60 How to use uaddr to obtain the symbol for an address

The example shows how to use the uaddr function to return the symbols for each openat system call when running the date command. The clause is predicated to 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
  5 147861                     openat:entry   libc.so.6`_nl_find_locale                         
  5 147861                     openat:entry   0x0                                               
Mon 20 Feb 18:11:30 GMT 2023