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

5 files changed, 30 insertions, 33 deletions

diff --git a/src/sysdeps/tryaccept4.c b/src/sysdeps/tryaccept4.c
index 98a75e6..ea3baaa 100644
--- a/src/sysdeps/tryaccept4.c
+++ b/src/sysdeps/tryaccept4.c
@@ -11,6 +11,10 @@
 #define _GNU_SOURCE
 #endif
 
+#ifndef _DEFAULT_SOURCE
+#define _DEFAULT_SOURCE
+#endif
+
 #include <sys/socket.h>
 #include <sys/stat.h>
 #include <fcntl.h>
diff --git a/src/sysdeps/trygetrandom.c b/src/sysdeps/trygetrandom.c
index 8abe3dd..cc2426b 100644
--- a/src/sysdeps/trygetrandom.c
+++ b/src/sysdeps/trygetrandom.c
@@ -1,24 +1,10 @@
 /* ISC license. */
 
-#undef _POSIX_C_SOURCE
-#undef _XOPEN_SOURCE
-
-#ifndef _GNU_SOURCE
-#define _GNU_SOURCE
-#endif
-
-#include <sys/types.h>
-#include <unistd.h>
-#include <sys/syscall.h>
-
-static int getrandom (void *buf, size_t buflen, unsigned int flags)
-{
-  return syscall(SYS_getrandom, buf, buflen, flags) ;
-}
+#include <sys/random.h>
 
 int main (void)
 {
   char buf[4] ;
-  if (getrandom(buf, 4, 0) < 0) return 1 ;
+  if (getrandom(buf, 4, GRND_NONBLOCK) < 0) return 1 ;
   return 0 ;
 }
diff --git a/src/sysdeps/trypipe2.c b/src/sysdeps/trypipe2.c
index 0b8cb3c..173b815 100644
--- a/src/sysdeps/trypipe2.c
+++ b/src/sysdeps/trypipe2.c
@@ -12,6 +12,9 @@
 #ifndef _BSD_SOURCE
 #define _BSD_SOURCE
 #endif
+#ifndef _DEFAULT_SOURCE
+#define _DEFAULT_SOURCE
+#endif
 #ifndef _NETBSD_SOURCE
 #define _NETBSD_SOURCE
 #endif
diff --git a/src/sysdeps/tryppoll.c b/src/sysdeps/tryppoll.c
index 1502f2c..18f7615 100644
--- a/src/sysdeps/tryppoll.c
+++ b/src/sysdeps/tryppoll.c
@@ -1,9 +1,20 @@
 /* ISC license. */
 
+#undef _POSIX_C_SOURCE
+#undef _XOPEN_SOURCE
+
+#ifndef _BSD_SOURCE
+#define _BSD_SOURCE
+#endif
+
 #ifndef _GNU_SOURCE
 #define _GNU_SOURCE
 #endif
 
+#ifndef _DEFAULT_SOURCE
+#define _DEFAULT_SOURCE
+#endif
+
 #include <sys/stat.h>
 #include <fcntl.h>
 #include <time.h>
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 ;
 }