Add support for dup3 to syscall.stp tapset.

* tapset/aux_syscalls.stp (_dup3_flag_str): New helper function.
* tapset/syscalls.stp (syscall.dup2): Add alternatives to handle dup3 also.
* testsuite/systemtap.syscall/dup.c: New testcase.

1 files changed, 43 insertions, 0 deletions

diff --git a/testsuite/systemtap.syscall/dup.c b/testsuite/systemtap.syscall/dup.c
new file mode 100644
index 00000000..862f7e91
--- /dev/null
+++ b/testsuite/systemtap.syscall/dup.c
@@ -0,0 +1,43 @@
+/* COVERAGE: dup dup2 dup3 */
+
+#define _GNU_SOURCE
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h>
+
+int main()
+{
+  dup(2);
+  //staptest// dup (2) = NNNN
+  
+  dup(256);
+  //staptest// dup (256) = -9 (EBADF)
+  
+  dup2(3, 4);
+  //staptest// dup2 (3, 4) = 4
+
+  dup2(255, 256);
+  //staptest// dup2 (255, 256) = -9 (EBADF)
+
+  /* weird corner case oldfd == newfd */
+  dup2(1, 1);
+  //staptest// dup2 (1, 1) = 1
+
+#ifdef O_CLOEXEC
+  dup3 (4, 5, O_CLOEXEC);
+  //staptest// dup3 (4, 5, O_CLOEXEC) = 5
+
+  dup3 (256, 255, O_CLOEXEC);
+  //staptest// dup3 (256, 255, O_CLOEXEC) = -9 (EBADF)
+  
+  dup3 (5, 6, 666);
+  //staptest// dup3 (5, 6, UNKNOWN) = -22 (EINVAL)
+
+  /* corner case not valid for dup3 */
+  dup3 (1, 1, O_CLOEXEC);
+  //staptest// dup3 (1, 1, O_CLOEXEC) = -22 (EINVAL)
+#endif
+
+  return 0;
+}