[PATCH 1/2] 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_disk_file.cc | 11 +++--------
 winsup/cygwin/pipe.cc               |  3 +--
 winsup/cygwin/syscalls.cc           |  2 +-
 3 files changed, 5 insertions(+), 11 deletions(-)

diff --git a/winsup/cygwin/fhandler_disk_file.cc b/winsup/cygwin/fhandler_disk_file.cc
index 2144a4c..252dc66 100644
--- a/winsup/cygwin/fhandler_disk_file.cc
+++ b/winsup/cygwin/fhandler_disk_file.cc
@@ -1075,10 +1075,7 @@ int
 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
      a simplified test here so that we don't have to ask for the actual
@@ -1097,9 +1094,7 @@ 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)
@@ -1111,7 +1106,7 @@ fhandler_disk_file::fadvise (off_t offset, off_t length, int advice)
       __seterrno_from_nt_status (status);
     }
 
-  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