/*
- * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 2000-2008 Apple Inc. All rights reserved.
*
- * @APPLE_LICENSE_HEADER_START@
- *
- * Copyright (c) 1999-2003 Apple Computer, Inc. All Rights Reserved.
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
*
* This file contains Original Code and/or Modifications of Original Code
* as defined in and that are subject to the Apple Public Source License
* Version 2.0 (the 'License'). You may not use this file except in
- * compliance with the License. Please obtain a copy of the License at
- * http://www.opensource.apple.com/apsl/ and read it before using this
- * file.
+ * compliance with the License. The rights granted to you under the License
+ * may not be used to create, or enable the creation or redistribution of,
+ * unlawful or unlicensed copies of an Apple operating system, or to
+ * circumvent, violate, or enable the circumvention or violation of, any
+ * terms of an Apple operating system software license agreement.
+ *
+ * Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this file.
*
* The Original Code and all software distributed under the License are
* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
* Please see the License for the specific language governing rights and
* limitations under the License.
*
- * @APPLE_LICENSE_HEADER_END@
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
*/
/* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
/*
#ifndef _SYS_UIO_H_
#define _SYS_UIO_H_
+#include <sys/cdefs.h>
+#include <sys/_types.h>
+
/*
- * XXX
- * iov_base should be a void *.
+ * [XSI] The ssize_t and size_t types shall be defined as described
+ * in <sys/types.h>.
*/
-struct iovec {
- char *iov_base; /* Base address. */
- size_t iov_len; /* Length. */
-};
+#include <sys/_types/_size_t.h>
+#include <sys/_types/_ssize_t.h>
-enum uio_rw { UIO_READ, UIO_WRITE };
+/*
+ * [XSI] Structure whose address is passed as the second parameter to the
+ * readv() and writev() functions.
+ */
+#include <sys/_types/_iovec_t.h>
-/* Segment flag values. */
-enum uio_seg {
- UIO_USERSPACE, /* from user data space */
- UIO_USERISPACE, /* from user I space */
- UIO_SYSSPACE, /* from system space */
- UIO_PHYS_USERSPACE /* kernel address is physical, to/from user data space */
-};
+
+#if !defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE)
+/*
+ * IO direction for uio_t.
+ * UIO_READ - data moves into iovec(s) associated with uio_t
+ * UIO_WRITE - data moves out of iovec(s) associated with uio_t
+ */
+enum uio_rw { UIO_READ, UIO_WRITE };
+#endif
#ifdef KERNEL
-struct uio {
- struct iovec *uio_iov;
- int uio_iovcnt;
- off_t uio_offset;
- int uio_resid;
- enum uio_seg uio_segflg;
- enum uio_rw uio_rw;
- struct proc *uio_procp;
+
+/*
+ * XXX This all really wants a uio_internal.h
+ */
+
+#include <sys/kernel_types.h>
+
+
+/*
+ * user / kernel address space type flags.
+ * WARNING - make sure to check when adding flags! Be sure new flags
+ * don't overlap the definitions in uio_internal.h
+ * NOTES -
+ * UIO_USERSPACE is equivalent to UIO_USERSPACE32, but UIO_USERSPACE32
+ * is preferred. UIO_USERSPACE remains for backwards compatibility.
+ * UIO_SYSSPACE is equivalent to UIO_SYSSPACE32, but UIO_SYSSPACE
+ * is preferred.
+ */
+enum uio_seg {
+ UIO_USERSPACE = 0, /* kernel address is virtual, to/from user virtual */
+ UIO_SYSSPACE = 2, /* kernel address is virtual, to/from system virtual */
+ UIO_USERSPACE32 = 5, /* kernel address is virtual, to/from user 32-bit virtual */
+ UIO_USERSPACE64 = 8, /* kernel address is virtual, to/from user 64-bit virtual */
+ UIO_SYSSPACE32 = 11 /* deprecated */
};
+#define UIO_SEG_IS_USER_SPACE( a_uio_seg ) \
+ ( (a_uio_seg) == UIO_USERSPACE64 || (a_uio_seg) == UIO_USERSPACE32 || \
+ (a_uio_seg) == UIO_USERSPACE )
+
+
+__BEGIN_DECLS
+
+/*
+ * uio_create - create an uio_t.
+ * Space is allocated to hold up to a_iovcount number of iovecs. The uio_t
+ * is not fully initialized until all iovecs are added using uio_addiov calls.
+ * a_iovcount is the maximum number of iovecs you may add.
+ */
+uio_t uio_create( int a_iovcount, /* max number of iovecs */
+ off_t a_offset, /* current offset */
+ int a_spacetype, /* type of address space */
+ int a_iodirection ); /* read or write flag */
+
+/*
+ * uio_reset - reset an uio_t.
+ * Reset the given uio_t to initial values. The uio_t is not fully initialized
+ * until all iovecs are added using uio_add_ov calls.
+ * The a_iovcount value passed in the uio_create is the maximum number of
+ * iovecs you may add.
+ */
+void uio_reset( uio_t a_uio,
+ off_t a_offset, /* current offset */
+ int a_spacetype, /* type of address space */
+ int a_iodirection ); /* read or write flag */
+
+/*
+ * uio_duplicate - allocate a new uio and make a copy of the given uio_t.
+ * may return NULL.
+ */
+uio_t uio_duplicate( uio_t a_uio );
+
+
+/*
+ * uio_free - free a uio_t allocated via uio_create.
+ */
+void uio_free( uio_t a_uio );
+
+/*
+ * uio_addiov - add an iovec to the given uio_t. You may call this up to
+ * the a_iovcount number that was passed to uio_create.
+ * returns 0 if add was successful else non zero.
+ */
+int uio_addiov( uio_t a_uio, user_addr_t a_baseaddr, user_size_t a_length );
+
+/*
+ * uio_getiov - get iovec data associated with the given uio_t. Use
+ * a_index to iterate over each iovec (0 to (uio_iovcnt(uio_t) - 1)).
+ * a_baseaddr_p and a_length_p may be NULL.
+ * returns -1 when a_index is out of range or invalid uio_t.
+ * returns 0 when data is returned.
+ */
+int uio_getiov( uio_t a_uio,
+ int a_index,
+ user_addr_t * a_baseaddr_p,
+ user_size_t * a_length_p );
+
+/*
+ * uio_update - update the given uio_t for a_count of completed IO.
+ * This call adjusts decrements the current iovec length and residual IO,
+ * and increments the current iovec base address and offset value.
+ */
+void uio_update( uio_t a_uio, user_size_t a_count );
+
+/*
+ * uio_resid - return the residual IO value for the given uio_t
+ */
+user_ssize_t uio_resid( uio_t a_uio );
+
+/*
+ * uio_setresid - set the residual IO value for the given uio_t
+ */
+void uio_setresid( uio_t a_uio, user_ssize_t a_value );
+
+/*
+ * uio_iovcnt - return count of active iovecs for the given uio_t
+ */
+int uio_iovcnt( uio_t a_uio );
+
+/*
+ * uio_offset - return the current offset value for the given uio_t
+ */
+off_t uio_offset( uio_t a_uio );
+
+/*
+ * uio_setoffset - set the current offset value for the given uio_t
+ */
+void uio_setoffset( uio_t a_uio, off_t a_offset );
+
+/*
+ * uio_rw - return the read / write flag for the given uio_t
+ */
+int uio_rw( uio_t a_uio );
+
+/*
+ * uio_setrw - set the read / write flag for the given uio_t
+ */
+void uio_setrw( uio_t a_uio, int a_value );
+
+/*
+ * uio_isuserspace - return non zero value if the address space
+ * flag is for a user address space (could be 32 or 64 bit).
+ */
+int uio_isuserspace( uio_t a_uio );
+
+/*
+ * uio_curriovbase - return the base address of the current iovec associated
+ * with the given uio_t. May return 0.
+ */
+user_addr_t uio_curriovbase( uio_t a_uio );
+
+/*
+ * uio_curriovlen - return the length value of the current iovec associated
+ * with the given uio_t.
+ */
+user_size_t uio_curriovlen( uio_t a_uio );
+
/*
* Limits
*/
#define UIO_MAXIOV 1024 /* max 1K of iov's */
#define UIO_SMALLIOV 8 /* 8 on stack, else malloc */
-extern int uiomove __P((caddr_t cp, int n, struct uio *uio));
-extern int uiomove64 __P((unsigned long long cp, int n, struct uio *uio));
-extern int ureadc __P((int c, struct uio *uio));
-extern int uwritec __P((struct uio *uio));
+extern int uiomove(const char * cp, int n, struct uio *uio);
+extern int uiomove64(const __uint64_t cp, int n, struct uio *uio);
+__END_DECLS
#endif /* KERNEL */
#ifndef KERNEL
-#include <sys/cdefs.h>
__BEGIN_DECLS
-ssize_t readv __P((int, const struct iovec *, int));
-ssize_t writev __P((int, const struct iovec *, int));
+ssize_t readv(int, const struct iovec *, int) __DARWIN_ALIAS_C(readv);
+ssize_t writev(int, const struct iovec *, int) __DARWIN_ALIAS_C(writev);
__END_DECLS
#endif /* !KERNEL */
+
#endif /* !_SYS_UIO_H_ */
projects / apple / xnu.git / blobdiff