sysdeps redesign: first part: minimize clr tests

 Remaining clr:
  emptyregex: can be safely guessed to no
  nullispointer: can't be safely guessed, but do we need the test?
  devurandom: can't be safely guessed
  malloc0: can more or less be safely guessed to no

1 files changed, 10 insertions, 17 deletions

diff --git a/src/sysdeps/trysplice.c b/src/sysdeps/trysplice.c
index 8e8bd72..969c5ea 100644
--- a/src/sysdeps/trysplice.c
+++ b/src/sysdeps/trysplice.c
@@ -1,29 +1,22 @@
 /* ISC license. */
 
+#undef _POSIX_C_SOURCE
+#undef _XOPEN_SOURCE
+
 #ifndef _GNU_SOURCE
 #define _GNU_SOURCE
 #endif
 
-#include <sys/stat.h>
 #include <fcntl.h>
-#include <unistd.h>
-
-#define N 4096
+#include <sys/uio.h>
 
 int main (void)
 {
-  int p[2] ;
-  int fd ;
-  if (pipe(p) < 0) return 111 ;
-  fd = open("./src/sysdeps/trysplice.c", O_RDONLY) ;
-  if (fd < 0) return 111 ;
-
-  for (;;)
-  {
-    ssize_t r = splice(fd, 0, p[1], 0, N, 0) ;
-    if (r < 0) return 1 ;
-    if (!r) break ;
-    if (splice(p[0], 0, 1, 0, r, 0) < r) return 2 ;
-  }
+  char s[2][2] ;
+  struct iovec v[2] = { { .iov_base = s[0], .iov_len = 2 }, { .iov_base = s[1], .iov_len = 2 } } ;
+  loff_t in, out ;
+  ssize_t r = splice(0, &in, 1, &out, 4096, SPLICE_F_MOVE) ;
+  r = tee(0, 1, 4096, SPLICE_F_NONBLOCK) ;
+  r = vmsplice(0, v, 2, 0) ;
   return 0 ;
 }