Support signalfd4 in syscalls2.stp tapset.

* tapset/aux_syscalls.stp (_signalfd4_flags_str): New utility function.
* tapset/syscalls2.stp (syscall.signalfd[.return]): Handle signalfd4 variant
  when available.
* testsuite/systemtap.syscall/signalfd.c: New test.

1 files changed, 35 insertions, 0 deletions

diff --git a/testsuite/systemtap.syscall/signalfd.c b/testsuite/systemtap.syscall/signalfd.c
new file mode 100644
index 00000000..e4621bf9
--- /dev/null
+++ b/testsuite/systemtap.syscall/signalfd.c
@@ -0,0 +1,35 @@
+/* COVERAGE: signalfd */
+#include <sys/signalfd.h>
+#include <sys/syscall.h>
+#include <sys/types.h>
+#include <unistd.h>
+#include <signal.h>
+#include <string.h>
+
+int main()
+{
+  sigset_t mask;
+  int sfd;
+
+  sigemptyset(&mask);
+  sigaddset(&mask, SIGINT);
+  sigaddset(&mask, SIGQUIT);
+  sfd = signalfd(-1, &mask, 0);
+  //staptest// signalfd (-1, XXXX, NNNN) = NNNN
+
+  sigaddset(&mask, SIGUSR1);
+  sigaddset(&mask, SIGUSR2);
+  sfd = signalfd(sfd, &mask, 0);
+  //staptest// signalfd (NNNN, XXXX, NNNN) = NNNN
+
+#if defined(SFD_NONBLOCK) && defined(SFD_CLOEXEC)
+  sfd = signalfd(-1, &mask, SFD_NONBLOCK);
+  //staptest// signalfd4 (-1, XXXX, NNNN, SFD_NONBLOCK) = NNNN
+  sfd = signalfd(-1, &mask, SFD_CLOEXEC);
+  //staptest// signalfd4 (-1, XXXX, NNNN, SFD_CLOEXEC) = NNNN
+  sfd = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC);
+  //staptest// signalfd4 (-1, XXXX, NNNN, SFD_NONBLOCK|SFD_CLOEXEC) = NNNN
+#endif
+
+  return 0;
+}