1 files changed, 113 insertions, 0 deletions
diff --git a/winsup/cygwin/testsuite/winsup.api/devzero.c b/winsup/cygwin/testsuite/winsup.api/devzero.c
new file mode 100644
index 000000000..85a2615b1
--- /dev/null
+++ b/winsup/cygwin/testsuite/winsup.api/devzero.c
@@ -0,0 +1,113 @@
+#include <stdio.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <fcntl.h>
+#include <sys/mman.h>
+
+main()
+{
+  int fd, r, w, l;
+  char buf[1024];
+  char *v;
+
+  fd = open("/dev/zero", O_RDONLY);
+  if (fd < 0)
+    {
+      fprintf(stderr, "Unable to open /dev/zero for reading\n");
+      perror("The error was");
+      exit(1);
+    }
+
+  l = read(fd, buf, 1024);
+  if (l != 1024)
+    {
+      fprintf(stderr, "Asked to read 1024 bytes, got %d\n", l);
+      exit(1);
+    }
+
+  for (r=0; r<1024; r++)
+    if (buf[r] != 0)
+      {
+	fprintf(stderr, "/dev/zero returned a byte of %02x at offset %d\n",
+		buf[r], r);
+	exit(1);
+      }
+
+  l = lseek(fd, 4096, 0);
+  if (l != 0)
+    {
+      fprintf(stderr, "l == %d\n", l);
+      exit(1);
+    }
+
+  l = close(fd);
+  if (l != 0)
+    {
+      fprintf(stderr, "close: returned %d\n", l);
+      perror("The error was");
+      exit(1);
+    }
+
+  fd = open("/dev/zero", O_WRONLY);
+  if (fd < 0)
+    {
+      fprintf(stderr, "Unable to open /dev/zero for writing\n");
+      perror("The error was");
+      exit(1);
+    }
+
+  l = write(fd, buf, 1024);
+  if (l != 1024)
+    {
+      fprintf(stderr, "Asked to write 1024 bytes, got %d\n", l);
+      exit(1);
+    }
+
+  l = close(fd);
+  if (l != 0)
+    {
+      fprintf(stderr, "close: returned %d\n", l);
+      perror("The error was");
+      exit(1);
+    }
+
+  fd = open("/dev/zero", O_RDWR);
+  v = (char *)mmap(0, 65536, PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0);
+  if (v == (char *)-1)
+    {
+      fprintf(stderr, "mmap r/w /dev/zero failed\n");
+      perror("The error was");
+      exit(1);
+    }
+
+  for (r=0; r<65536; r++)
+    if (v[r] != 0)
+      {
+	fprintf(stderr, "mmap'd r/w /dev/zero has byte %d at offset %d\n",
+		v[r], r);
+	exit(1);
+      }
+  munmap(v, 65536);
+  close(fd);
+
+  fd = open("/dev/zero", O_RDONLY);
+  v = (char *)mmap(0, 65536, PROT_READ, MAP_SHARED, fd, 0);
+  if (v == (char *)-1)
+    {
+      fprintf(stderr, "mmap /dev/zero r/o failed\n");
+      perror("The error was");
+      exit(1);
+    }
+
+  for (r=0; r<65536; r++)
+    if (v[r] != 0)
+      {
+	fprintf(stderr, "mmap'd r/o /dev/zero has byte %d at offset %d\n",
+		v[r], r);
+	exit(1);
+      }
+  munmap(v, 65536);
+  close(fd);
+
+  exit(0);
+}