1 files changed, 79 insertions, 0 deletions
diff --git a/winsup/testsuite/winsup.api/checksignal.c b/winsup/testsuite/winsup.api/checksignal.c
new file mode 100644
index 000000000..a8b5d3927
--- /dev/null
+++ b/winsup/testsuite/winsup.api/checksignal.c
@@ -0,0 +1,79 @@
+#include <stdio.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <signal.h>
+
+#include "test.h"
+#include "usctest.h"
+
+char *TCID = "checksignal";    	/* Test program identifier. */
+int TST_TOTAL = 3;              /* Total number of test cases. */
+extern int Tst_count;           /* Test Case counter for tst_* routines */
+
+void
+sig_handler (int signo)
+{
+  errno = EINVAL;
+}
+
+int
+main ()
+{
+  int n, ret;
+  int fds[2];
+  char buf[10];
+  struct sigaction act;
+
+  Tst_count = 0;
+
+  if (pipe (fds) < 0)
+    tst_brk (TBROK, NULL, NULL, "Create pipe");
+
+  /* Reset SA_RESTART flag. */
+  while ((ret = sigaction (SIGALRM, NULL, &act)) == EINTR)
+    ;
+  if (ret)
+    tst_brk (TBROK, NULL, NULL, "Get signal action structure");
+  act.sa_flags &= ~SA_RESTART;
+  while ((ret = sigaction (SIGALRM, &act, NULL)) == EINTR)
+    ;
+  if (ret)
+    tst_brk (TBROK, NULL, NULL, "Reset SA_RESTART");
+
+  /* Set signal handler using signal(2) call... */
+  if (signal (SIGALRM, sig_handler) < 0)
+    tst_brk (TBROK, NULL, NULL, "Call signal() to install signal handler");
+  /* ...and check if signal(2) sets SA_RESTART again. */
+  while ((ret = sigaction (SIGALRM, NULL, &act)) == EINTR)
+    ;
+  if (ret)
+    tst_brk (TBROK, NULL, NULL, "Get signal action structure");
+  tst_resm (act.sa_flags & SA_RESTART ? TPASS : TFAIL,
+	    "signal() sets SA_RESTART");
+
+  /* Reset SA_RESTART flag again. */
+  act.sa_handler = sig_handler;
+  act.sa_flags &= ~SA_RESTART;
+  while ((ret = sigaction (SIGALRM, &act, NULL)) == EINTR)
+    ;
+  if (ret)
+    tst_brk (TBROK, NULL, NULL, "Reset SA_RESTART");
+
+  /* Start timer to force a SIGALRM. */
+  alarm (1);
+
+  /* Call read(2) to check if the EINTR errno is correctly preserved,
+     even if the signal handler routine changes errno. */
+  n = read(fds[0], buf, 10);
+  tst_resm (n < 0 && errno == EINTR ? TPASS : TFAIL,
+	    "Set EINTR on interrupted read() call");
+
+  /* Check if another errno is correctly returned (here EBADF). */
+  close (fds[0]);
+  n = read(fds[0], buf, 10);
+  tst_resm (n < 0 && errno == EBADF ? TPASS : TFAIL,
+  	    "Set EBADF on closed file descriptor");
+
+  tst_exit ();
+}