preadtest command-line option to enable syscall hacks

435eaffb · Silas Boyd-Wickizer · a2ab32e5 · 435eaffb
--- a/preadtest.cc
+++ b/preadtest.cc
@@ -13,6 +13,8 @@
 #define BSIZE 4096
 #define PSIZE (4*BSIZE)

+static int usekernlet;
+
 static char buf[BSIZE];

 struct ipcctl *ipcctl = (struct ipcctl*)KSHARED;
@@ -57,6 +59,9 @@ main(int ac, char **av)
  int i, k;
  int fd;

+  if (ac > 1)
+    usekernlet = av[1][0] == 'k';
+  
  fd = open("preadtest.x", O_CREATE|O_RDWR);
  if (fd < 0)
    die("open failed");
@@ -75,6 +80,7 @@ main(int ac, char **av)
  }
  t1 = rdtsc();

+  printf(1, "usekernlet %u\n", usekernlet);  
  printf(1, "cycles %lu\n", t1 - t0);
  
  exit();