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-rw-r--r--src/runtime/sys_darwin_amd64.s6
1 files changed, 6 insertions, 0 deletions
diff --git a/src/runtime/sys_darwin_amd64.s b/src/runtime/sys_darwin_amd64.s
index ba81fcc35c..3ba673c5ec 100644
--- a/src/runtime/sys_darwin_amd64.s
+++ b/src/runtime/sys_darwin_amd64.s
@@ -437,6 +437,12 @@ TEXT runtime·fcntl_trampoline(SB),NOSPLIT,$0
MOVL 0(DI), DI // arg 1 fd
XORL AX, AX // vararg: say "no float args"
CALL libc_fcntl(SB)
+ TESTL AX, AX
+ JGT noerr
+ CALL libc_error(SB)
+ MOVL (AX), AX
+ NEGL AX // caller expects negative errno value
+noerr:
POPQ BP
RET