1 files changed, 24 insertions, 0 deletions
diff --git a/src/libstddjb/skasigaction.c b/src/libstddjb/skasigaction.c
new file mode 100644
index 0000000..a673fcb
--- /dev/null
+++ b/src/libstddjb/skasigaction.c
@@ -0,0 +1,24 @@
+/* ISC license. */
+
+#include <signal.h>
+#include <skalibs/sysdeps.h>
+#include <skalibs/sig.h>
+
+int skasigaction (int sig, struct skasigaction const *new, struct skasigaction *old)
+{
+  struct sigaction sanew, saold ;
+  if (((new->flags & SKASA_MASKALL) ? sigfillset(&sanew.sa_mask) : sigemptyset(&sanew.sa_mask)) == -1) return -1 ;
+  sanew.sa_handler = new->handler ;
+  sanew.sa_flags = (new->flags & SKASA_NOCLDSTOP) ? SA_NOCLDSTOP : 0 ;
+  if (sigaction(sig, &sanew, &saold) == -1) return -1 ;
+  if (old)
+  {
+    register int r = sigismember(&saold.sa_mask, (sig == SIGTERM) ? SIGPIPE : SIGTERM) ;
+    if (r == -1) return -1 ;
+    old->flags = 0 ;
+    if (r) old->flags |= SKASA_MASKALL ;
+    if (saold.sa_flags & SA_NOCLDSTOP) old->flags |= SKASA_NOCLDSTOP ;
+    old->handler = saold.sa_handler ;
+  }
+  return 0 ;
+}