Import selfpipe code from skalibs 1.2.5

[andersk@mit.edu: Move code to new third/libstddjb directory]
2012-02-26 15:58:37 -05:00
parent 9a3ab83783
commit 77f3a9073f
24 changed files with 697 additions and 0 deletions
@@ -0,0 +1,64 @@
+/* ISC license. */
+
+/* MT-unsafe */
+
+#include <errno.h>
+#include <signal.h>
+#include "sysdeps.h"
+#include "selfpipe-internal.h"
+#include "selfpipe.h"
+
+#ifdef HASSIGNALFD
+
+#include <sys/signalfd.h>
+
+int selfpipe_trapset (sigset_t const *set)
+{
+  sigset_t old ;
+  if (selfpipe_fd < 0) return (errno = EBADF, -1) ;
+  if (sigprocmask(SIG_SETMASK, set, &old) < 0) return -1 ;
+  if (signalfd(selfpipe_fd, set, SFD_NONBLOCK | SFD_CLOEXEC) < 0)
+  {
+    int e = errno ;
+    sigprocmask(SIG_SETMASK, &old, 0) ;
+    errno = e ;
+    return -1 ;
+  }
+  selfpipe_caught = *set ;
+  return 0 ;
+}
+
+#else
+
+#include "sig.h"
+#include "nsig.h"
+
+int selfpipe_trapset (sigset_t const *set)
+{
+  unsigned int i = 1 ;
+  if (selfpipe_fd < 0) return (errno = EBADF, -1) ;
+  for (; i <= NSIG ; i++)
+  {
+    register int h = sigismember(set, i) ;
+    if (h < 0) continue ;
+    if (h)
+    {
+      if (sig_catcha(i, &selfpipe_ssa) < 0) break ;
+    }
+    else if (sigismember(&selfpipe_caught, i))
+    {
+      if (sig_restore(i) < 0) break ;
+    }
+  }
+  if (i <= NSIG)
+  {
+    int e = errno ;
+    sig_restoreto(set, i) ;
+    errno = e ;
+    return -1 ;
+  }
+  selfpipe_caught = *set ;
+  return 0 ;
+}
+
+#endif