[Valgrind-developers] [valgrind] Bug 413410 - unhandled amd64-darwin syscall: mach:50 (on macOS 10.15)

[Paul F. <pa...@so...>]

https://sourceware.org/cgit/valgrind/commit/?id=2900866885d96b0419145a38d5737de3baaa7773

commit 2900866885d96b0419145a38d5737de3baaa7773
Author: Paul Floyd <pj...@wa...>
Date:   Mon Mar 9 20:42:44 2026 +0100

    Bug 413410 - unhandled amd64-darwin syscall: mach:50 (on macOS 10.15)
    
    Was missing setting AFTER. mach traps are quite different to
    UNIX syscall wrappers so I might have missed some more things.

Diff:
---
 NEWS                                 |  1 +
 coregrind/m_syswrap/syswrap-darwin.c | 12 ++++++++----
 2 files changed, 9 insertions(+), 4 deletions(-)

diff --git a/NEWS b/NEWS
index 08db26971c..35c0b8a474 100644
--- a/NEWS
+++ b/NEWS
@@ -62,6 +62,7 @@ are not entered into bugzilla tend to get forgotten about or ignored.
 406674  False positive when reading bitfield value on code compiled with
         clang 7.0
 413369  unhandled amd64-darwin syscall: unix:151 (getpgid)
+413410  unhandled amd64-darwin syscall: mach:50 (on macOS 10.15)
 487055  memcheck/tests/x86-linux/scalar fails running in Docker
 503238  s390x: Support miscellaneous-instruction-extensions facility 4
 503239  s390x: Support vector-enhancements facility 3
diff --git a/coregrind/m_syswrap/syswrap-darwin.c b/coregrind/m_syswrap/syswrap-darwin.c
index 668f2ef029..b92ca8d977 100644
--- a/coregrind/m_syswrap/syswrap-darwin.c
+++ b/coregrind/m_syswrap/syswrap-darwin.c
@@ -11116,16 +11116,20 @@ POST(kevent_id)
    }
 }
 
-PRE(thread_get_special_reply_port)
-{
-   PRINT("thread_get_special_reply_port()");
-}
 
 POST(thread_get_special_reply_port)
 {
    record_named_port(tid, RES, MACH_PORT_RIGHT_RECEIVE, "special-reply-%p");
    PRINT("special reply port %s", name_for_port(RES));
 }
+
+PRE(thread_get_special_reply_port)
+{
+   PRINT("thread_get_special_reply_port()");
+   AFTER = POST_FN(thread_get_special_reply_port);
+
+}
+
 #endif /* DARWIN_VERS >= DARWIN_10_13 */