* miscfuncs.cc (check_iovec_for_read): Don't check buffer when zero length

iov_len.
(check_iovec_for_write): Ditto.
* fhandler.h (fhandler_base::readv): New method.
(fhandler_base::writev): Ditto.
* fhandler.cc (fhandler_base::readv): New method.
(fhandler_base::writev): Ditto.
* syscalls.cc (_read): Delegate to readv(2).
(_write): Ditto, mutatis mutandi.
(readv): Rewrite, based on the old _read code, to use the new
fhandler_base::readv method.  Improve access mode handling and ensure all calls
reach the final strace statement.
(writev): Ditto, mutatis mutandi.
* include/sys/uio.h (struct iovec): Change field types to match SUSv3.
* winsup.h (check_iovec_for_read): New function.
(check_iovec_for_write): Ditto.
* miscfuncs.cc (check_iovec_for_read): Ditto.
(check_iovec_for_write): Ditto.

1 files changed, 3 insertions, 0 deletions

diff --git a/winsup/cygwin/fhandler.h b/winsup/cygwin/fhandler.h
index ec72091e3..a63c0514e 100644
--- a/winsup/cygwin/fhandler.h
+++ b/winsup/cygwin/fhandler.h
@@ -116,6 +116,7 @@ class path_conv;
 class fhandler_disk_file;
 typedef struct __DIR DIR;
 struct dirent;
+struct iovec;
 
 enum bg_check_types
 {
@@ -297,6 +298,8 @@ class fhandler_base
   virtual char const * ttyname () { return get_name(); }
   virtual int __stdcall read (void *ptr, size_t len) __attribute__ ((regparm (3)));
   virtual int write (const void *ptr, size_t len);
+  virtual ssize_t readv (const struct iovec *, int iovcnt, ssize_t tot = -1);
+  virtual ssize_t writev (const struct iovec *, int iovcnt, ssize_t tot = -1);
   virtual __off64_t lseek (__off64_t offset, int whence);
   virtual int lock (int, struct flock *);
   virtual void dump ();