Improve sigreturn decoding on x86 to show RT signal bits too.

This includes decoding of 32-bit sigreturn by 64-bit strace,
which previously wasn't done.

Added a test for it.

Signed-off-by: Denys Vlasenko <dvlasenk@redhat.com>

1 files changed, 30 insertions, 0 deletions

diff --git a/test/sigreturn.c b/test/sigreturn.c
new file mode 100644
index 0000000..246a3ce
--- /dev/null
+++ b/test/sigreturn.c
@@ -0,0 +1,30 @@
+/*
+ * Check that strace output contains RT_1 RT_3 RT_31 RT_32 here:
+ *  rt_sigprocmask(SIG_BLOCK, [CHLD RT_1 RT_3 RT_31 RT_32], NULL, 8) = 0
+ * and here:
+ *  sigreturn() (mask [CHLD RT_1 RT_3 RT_31 RT_32]) = 0
+ *
+ * On x86, both 32-bit and 64-bit strace needs to be checked.
+ */
+#include <stdlib.h>
+#include <unistd.h>
+#include <signal.h>
+
+void null_handler(int sig)
+{
+}
+
+int main(int argc, char *argv[])
+{
+	sigset_t set;
+	sigemptyset(&set);
+	sigaddset(&set, SIGCHLD);
+	sigaddset(&set, 33);
+	sigaddset(&set, 35);
+	sigaddset(&set, 63);
+	sigaddset(&set, 64);
+	sigprocmask(SIG_BLOCK, &set, NULL);
+	signal(SIGWINCH, null_handler);
+	raise(SIGWINCH);
+	return 0;
+}