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 +1,27 @@
+/* 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>
+#else
+# include "djbunix.h"
+#endif
+
+int selfpipe_init (void)
+{
+  if (selfpipe_fd >= 0) return (errno = EBUSY, -1) ;
+  sigemptyset(&selfpipe_caught) ;
+#ifdef HASSIGNALFD
+  selfpipe_fd = signalfd(-1, &selfpipe_caught, SFD_NONBLOCK | SFD_CLOEXEC) ;
+#else
+  if (pipenbcoe(selfpipe) < 0) return -1 ;
+#endif
+  return selfpipe_fd ;
+}