[PATCH] posix_fadvise() *returns* error codes but does not set errno

["Erik M. Bray" <erik dot m dot bray at gmail dot com>]

Also updates the fhandler_*::fadvise implementations to adhere to the same
semantics.
---
 winsup/cygwin/fhandler.cc           |  3 +--
 winsup/cygwin/fhandler_disk_file.cc | 16 ++++++----------
 winsup/cygwin/pipe.cc               |  3 +--
 winsup/cygwin/syscalls.cc           |  2 +-
 4 files changed, 9 insertions(+), 15 deletions(-)

diff --git a/winsup/cygwin/fhandler.cc b/winsup/cygwin/fhandler.cc
index d719b7c..858c1fd 100644
--- a/winsup/cygwin/fhandler.cc
+++ b/winsup/cygwin/fhandler.cc
@@ -1764,8 +1764,7 @@ fhandler_base::fsetxattr (const char *name, const void *value, size_t size,
 int
 fhandler_base::fadvise (off_t offset, off_t length, int advice)
 {
-  set_errno (EINVAL);
-  return -1;
+  return EINVAL;
 }
 
 int
diff --git a/winsup/cygwin/fhandler_disk_file.cc b/winsup/cygwin/fhandler_disk_file.cc
index 2144a4c..f46e355 100644
--- a/winsup/cygwin/fhandler_disk_file.cc
+++ b/winsup/cygwin/fhandler_disk_file.cc
@@ -1076,8 +1076,7 @@ fhandler_disk_file::fadvise (off_t offset, off_t length, int advice)
 {
   if (advice < POSIX_FADV_NORMAL || advice > POSIX_FADV_NOREUSE)
     {
-      set_errno (EINVAL);
-      return -1;
+      return EINVAL;
     }
 
   /* Windows only supports advice flags for the whole file.  We're using
@@ -1097,21 +1096,18 @@ fhandler_disk_file::fadvise (off_t offset, off_t length, int advice)
   NTSTATUS status = NtQueryInformationFile (get_handle (), &io,
 					    &fmi, sizeof fmi,
 					    FileModeInformation);
-  if (!NT_SUCCESS (status))
-    __seterrno_from_nt_status (status);
-  else
+  if (NT_SUCCESS (status))
     {
       fmi.Mode &= ~FILE_SEQUENTIAL_ONLY;
       if (advice == POSIX_FADV_SEQUENTIAL)
-	fmi.Mode |= FILE_SEQUENTIAL_ONLY;
+        fmi.Mode |= FILE_SEQUENTIAL_ONLY;
       status = NtSetInformationFile (get_handle (), &io, &fmi, sizeof fmi,
-				     FileModeInformation);
+                                     FileModeInformation);
       if (NT_SUCCESS (status))
-	return 0;
-      __seterrno_from_nt_status (status);
+	    return 0;
     }
 
-  return -1;
+  return geterrno_from_nt_status (status);
 }
 
 int
diff --git a/winsup/cygwin/pipe.cc b/winsup/cygwin/pipe.cc
index 79b7966..8738d34 100644
--- a/winsup/cygwin/pipe.cc
+++ b/winsup/cygwin/pipe.cc
@@ -165,8 +165,7 @@ fhandler_pipe::lseek (off_t offset, int whence)
 int
 fhandler_pipe::fadvise (off_t offset, off_t length, int advice)
 {
-  set_errno (ESPIPE);
-  return -1;
+  return ESPIPE;
 }
 
 int
diff --git a/winsup/cygwin/syscalls.cc b/winsup/cygwin/syscalls.cc
index caa3a77..d0d735b 100644
--- a/winsup/cygwin/syscalls.cc
+++ b/winsup/cygwin/syscalls.cc
@@ -2937,7 +2937,7 @@ posix_fadvise (int fd, off_t offset, off_t len, int advice)
   if (cfd >= 0)
     res = cfd->fadvise (offset, len, advice);
   else
-    set_errno (EBADF);
+    res = EBADF;
   syscall_printf ("%R = posix_fadvice(%d, %D, %D, %d)",
 		  res, fd, offset, len, advice);
   return res;
-- 
2.8.3