- Add two new system calls: preadv() and pwritev() which are like readv()

  and writev() except that they take an additional offset argument and do
  not change the current file position.  In SAT speak:
  preadv:readv::pread:read and pwritev:writev::pwrite:write.
- Try to reduce code duplication some by merging most of the old
  kern_foov() and dofilefoo() functions into new dofilefoo() functions
  that are called by kern_foov() and kern_pfoov().  The non-v functions
  now all generate a simple uio on the stack from the passed in arguments
  and then call kern_foov().  For example, read() now just builds a uio and
  calls kern_readv() and pwrite() just builds a uio and calls kern_pwritev().

PR:		kern/80362
Submitted by:	Marc Olzheim marcolz at stack dot nl (1)
Approved by:	re (scottl)
MFC after:	1 week

2 files changed, 37 insertions, 2 deletions

diff --git a/sys/compat/freebsd32/freebsd32_misc.c b/sys/compat/freebsd32/freebsd32_misc.c
index d21ced6..de4881e 100644
--- a/sys/compat/freebsd32/freebsd32_misc.c
+++ b/sys/compat/freebsd32/freebsd32_misc.c
@@ -764,6 +764,34 @@ freebsd32_writev(struct thread *td, struct freebsd32_writev_args *uap)
 }
 
 int
+freebsd32_preadv(struct thread *td, struct freebsd32_preadv_args *uap)
+{
+	struct uio *auio;
+	int error;
+
+	error = freebsd32_copyinuio(uap->iovp, uap->iovcnt, &auio);
+	if (error)
+		return (error);
+	error = kern_preadv(td, uap->fd, auio, uap->offset);
+	free(auio, M_IOV);
+	return (error);
+}
+
+int
+freebsd32_pwritev(struct thread *td, struct freebsd32_pwritev_args *uap)
+{
+	struct uio *auio;
+	int error;
+
+	error = freebsd32_copyinuio(uap->iovp, uap->iovcnt, &auio);
+	if (error)
+		return (error);
+	error = kern_pwritev(td, uap->fd, auio, uap->offset);
+	free(auio, M_IOV);
+	return (error);
+}
+
+int
 freebsd32_settimeofday(struct thread *td,
 		       struct freebsd32_settimeofday_args *uap)
 {
diff --git a/sys/compat/freebsd32/syscalls.master b/sys/compat/freebsd32/syscalls.master
index c7fa7af..d861445 100644
--- a/sys/compat/freebsd32/syscalls.master
+++ b/sys/compat/freebsd32/syscalls.master
@@ -482,8 +482,15 @@
 286	AUE_NULL	UNIMPL	nosys
 287	AUE_NULL	UNIMPL	nosys
 288	AUE_NULL	UNIMPL	nosys
-289	AUE_NULL	UNIMPL	nosys
-290	AUE_NULL	UNIMPL	nosys
+; 289 and 290 from NetBSD (OpenBSD: 267 and 268)
+289	AUE_NULL	MSTD	{ ssize_t freebsd32_preadv(int fd, \
+					struct iovec32 *iovp, \
+					u_int iovcnt, off_t offset); }
+; XXX note - bigendian is different
+290	AUE_NULL	MSTD	{ ssize_t freebsd32_pwritev(int fd, \
+					struct iovec32 *iovp, \
+					u_int iovcnt, off_t offset); }
+; XXX note - bigendian is different
 291	AUE_NULL	UNIMPL	nosys
 292	AUE_NULL	UNIMPL	nosys
 293	AUE_NULL	UNIMPL	nosys