1 files changed, 41 insertions, 0 deletions
diff --git a/src/sysdeps/tryselectshorttimeout.c b/src/sysdeps/tryselectshorttimeout.c
new file mode 100644
index 0000000..9049079
--- /dev/null
+++ b/src/sysdeps/tryselectshorttimeout.c
@@ -0,0 +1,41 @@
+/* ISC license. */
+
+#undef _POSIX_C_SOURCE
+#undef _XOPEN_SOURCE
+
+#ifndef _BSD_SOURCE
+#define _BSD_SOURCE
+#endif
+#ifndef _NETBSD_SOURCE
+#define _NETBSD_SOURCE
+#endif
+#ifndef _DARWIN_C_SOURCE
+#define _DARWIN_C_SOURCE
+#endif
+
+#include <sys/types.h>
+#include <sys/time.h>
+#include <sys/select.h>
+#include <unistd.h>
+#include <signal.h>
+
+static void alrm_handler (int sig)
+{
+  (void)sig ;
+  _exit(1) ;
+}
+
+int main (void)
+{
+  struct sigaction action = { .sa_handler = &alrm_handler, .sa_flags = SA_NOCLDSTOP | SA_RESTART } ;
+  struct timeval tv = { .tv_sec = 100000000, .tv_usec = 0 } ;
+  fd_set r, w, x ;
+  FD_ZERO(&r) ;
+  FD_ZERO(&w) ;
+  FD_ZERO(&x) ;
+  sigfillset(&action.sa_mask) ;
+  if (sigaction(SIGALRM, &action, 0) == -1) _exit(111) ;
+  alarm(1) ;
+  if (select(1, &r, &w, &x, &tv) == -1) _exit(errno == EINVAL ? 0 : 111) ;
+  _exit(1) ;
+}