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authorUlrich Drepper <drepper@gmail.com>2011-04-17 21:51:26 -0400
committerUlrich Drepper <drepper@gmail.com>2011-04-17 21:51:26 -0400
commit75ea32abcde4e1699328354e1804ea94560d2950 (patch)
treee8a166eed29a24667460a4759ac4ae84fe95c3a6 /stdlib/bug-getcontext.c
parent94409c736b216c405c214c041a33b5fab58bd408 (diff)
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Fix FPU context handling in getcontext on x86-64.
fnstenv on x86-64 seems to clear the state. Work around.
Diffstat (limited to 'stdlib/bug-getcontext.c')
-rw-r--r--stdlib/bug-getcontext.c48
1 files changed, 48 insertions, 0 deletions
diff --git a/stdlib/bug-getcontext.c b/stdlib/bug-getcontext.c
new file mode 100644
index 0000000..745aa1f
--- /dev/null
+++ b/stdlib/bug-getcontext.c
@@ -0,0 +1,48 @@
+/* BZ 12420 */
+
+#include <errno.h>
+#include <fenv.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <ucontext.h>
+
+static int
+do_test (void)
+{
+ int except_mask = FE_DIVBYZERO | FE_INVALID | FE_OVERFLOW | FE_UNDERFLOW;
+ int status = feenableexcept (except_mask);
+
+ except_mask = fegetexcept ();
+ if (except_mask == -1)
+ {
+ printf("\nBefore getcontext(): fegetexcept returned: %d\n",
+ except_mask);
+ return 1;
+ }
+
+ ucontext_t ctx;
+ status = getcontext(&ctx);
+ if (status)
+ {
+ printf("\ngetcontext failed, errno: %d.\n", errno);
+ return 1;
+ }
+
+ printf ("\nDone with getcontext()!\n");
+ fflush (NULL);
+
+ int mask = fegetexcept ();
+ if (mask != except_mask)
+ {
+ printf("\nAfter getcontext(): fegetexcept returned: %d, expected: %d.\n",
+ mask, except_mask);
+ return 1;
+ }
+
+ printf("\nAt end fegetexcept() returned %d, expected: %d.\n",
+ mask, except_mask);
+ return 0;
+}
+
+#define TEST_FUNCTION do_test ()
+#include "../test-skeleton.c"