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-rw-r--r--cpukit/posix/src/sigaction.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/cpukit/posix/src/sigaction.c b/cpukit/posix/src/sigaction.c
index b986d97ba1..a8d48f9f3b 100644
--- a/cpukit/posix/src/sigaction.c
+++ b/cpukit/posix/src/sigaction.c
@@ -43,7 +43,7 @@ int sigaction(
*oact = _POSIX_signals_Vectors[ sig ];
if ( !sig )
- return 0;
+ rtems_set_errno_and_return_minus_one( EINVAL );
if ( !is_valid_signo(sig) )
rtems_set_errno_and_return_minus_one( EINVAL );