initial check-in, version 0.5.0v0.5.0

1 files changed, 17 insertions, 0 deletions

diff --git a/src/signal/sigsetjmp.c b/src/signal/sigsetjmp.c
new file mode 100644
index 00000000..a6667a27
--- /dev/null
+++ b/src/signal/sigsetjmp.c
@@ -0,0 +1,17 @@
+#include <setjmp.h>
+#include <signal.h>
+#include <stdlib.h>
+
+/* !!! This function will not work unless the compiler performs
+ * tail call optimization. Machine-specific asm versions should
+ * be created instead even though the workaround (tail call)
+ * is entirely non-machine-specific... */
+
+int sigsetjmp(sigjmp_buf buf, int save)
+{
+	long *flag = buf + sizeof(jmp_buf)/sizeof(long);
+	sigset_t *mask = (void *)(flag + 1);
+	if ((*flag = save))
+		sigprocmask (SIG_SETMASK, NULL, mask);
+	return setjmp((void *)buf);
+}