I'm looking for the following dylib file which is included from process loginwindow.

If I run vmmap to inspect loginwindow while it's up and running I get :

user@mycomp / % sudo vmmap -I ``pgrep loginwindow`` | grep libIASUnifiedProgress.dylib

__TEXT                      1c7566000-1c756e000    [   32K    32K     0K     0K] r-x/r-x SM=COW          /usr/lib/libIASUnifiedProgress.dylib
__DATA_CONST                1fdd05628-1fdd06438    [  3600   3600     0K     0K] rw-/rw- SM=COW          /usr/lib/libIASUnifiedProgress.dylib
__DATA                      200ff1f18-200ff27b0    [  2200   2200     0K     0K] rw-/rw- SM=COW          /usr/lib/libIASUnifiedProgress.dylib
__AUTH_CONST                207d4b260-207d4c008    [  3496   3496     0K     0K] rw-/rw- SM=COW          /usr/lib/libIASUnifiedProgress.dylib
__OBJC_CONST                207d4c008-207d4c368    [   864    864     0K     0K] rw-/rw- SM=COW          /usr/lib/libIASUnifiedProgress.dylib
__DATA_DIRTY                20a5b9250-20a5b9460    [   528    528    528     0K] rw-/rw- SM=COW          /usr/lib/libIASUnifiedProgress.dylib

however, the file doesn't appear to be there ... I'm guessing it's some new trick made by Apple, perhaps do you know how can I find it anyway ?


1 Answer 1


On ARM macOS, like on iOS, most of the common dylibs are no longer shipped as separate files, but are bundled into the dyld shared cache. You can usually find the caches in /System/Library/dyld/.

  • Hi and thanks for the help. So, In this case, do you know where can I find the this bundle backed static file ? and after I've found it, would I expect it to be encrypted ?
    – Zohar81
    Commented Mar 21, 2021 at 11:09
  • @Zohar81 added the location. It's not encrypted but extracting dylibs from it is not trivial since it's optimized for code and data sharing
    – Igor Skochinsky
    Commented Mar 21, 2021 at 12:39
  • Do you think that I can link against this library (libIASUnifiedProgress.dylib) from my own project ? I see that in Xcode it's existed as tbd under : ./Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/lib/libIASUnifiedProgress.tbd
    – Zohar81
    Commented Mar 24, 2021 at 7:26
  • Yes, linking against the .tbd should work.
    – Igor Skochinsky
    Commented Mar 24, 2021 at 7:29

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