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31 * @(#)uio.h 8.5 (Berkeley) 2/22/94
38 #include <sys/cdefs.h>
39 #include <sys/_types.h>
40 #include <sys/_iovec.h>
42 #ifndef _SSIZE_T_DECLARED
43 typedef __ssize_t ssize_t;
44 #define _SSIZE_T_DECLARED
47 #ifndef _OFF_T_DECLARED
48 typedef __off_t off_t;
49 #define _OFF_T_DECLARED
53 enum uio_rw { UIO_READ, UIO_WRITE };
55 /* Segment flag values. */
57 UIO_USERSPACE, /* from user data space */
58 UIO_SYSSPACE, /* from system space */
59 UIO_NOCOPY /* don't copy, already in object */
66 struct iovec *uio_iov; /* scatter/gather list */
67 int uio_iovcnt; /* length of scatter/gather list */
68 off_t uio_offset; /* offset in target object */
69 ssize_t uio_resid; /* remaining bytes to process */
70 enum uio_seg uio_segflg; /* address space */
71 enum uio_rw uio_rw; /* operation */
72 struct thread *uio_td; /* owner */
78 * N.B.: UIO_MAXIOV must be no less than IOV_MAX from <sys/syslimits.h>
79 * which in turn must be no less than _XOPEN_IOV_MAX from <limits.h>. If
80 * we ever make this tunable (probably pointless), then IOV_MAX should be
81 * removed from <sys/syslimits.h> and applications would be expected to use
82 * sysconf(3) to find out the correct value, or else assume the worst
83 * (_XOPEN_IOV_MAX). Perhaps UIO_MAXIOV should be simply defined as
86 #define UIO_MAXIOV 1024 /* max 1K of iov's */
90 struct bus_dma_segment;
92 struct uio *cloneuio(struct uio *uiop);
93 int copyinfrom(const void * __restrict src, void * __restrict dst,
95 int copyiniov(const struct iovec *iovp, u_int iovcnt, struct iovec **iov,
97 int copyinstrfrom(const void * __restrict src, void * __restrict dst,
98 size_t len, size_t * __restrict copied, int seg);
99 int copyinuio(const struct iovec *iovp, u_int iovcnt, struct uio **uiop);
100 int copyout_map(struct thread *td, vm_offset_t *addr, size_t sz);
101 int copyout_unmap(struct thread *td, vm_offset_t addr, size_t sz);
102 int physcopyin(void *src, vm_paddr_t dst, size_t len);
103 int physcopyout(vm_paddr_t src, void *dst, size_t len);
104 int physcopyin_vlist(struct bus_dma_segment *src, off_t offset,
105 vm_paddr_t dst, size_t len);
106 int physcopyout_vlist(vm_paddr_t src, struct bus_dma_segment *dst,
107 off_t offset, size_t len);
108 int uiomove(void *cp, int n, struct uio *uio);
109 int uiomove_frombuf(void *buf, int buflen, struct uio *uio);
110 int uiomove_fromphys(struct vm_page *ma[], vm_offset_t offset, int n,
112 int uiomove_nofault(void *cp, int n, struct uio *uio);
113 int uiomove_object(struct vm_object *obj, off_t obj_size, struct uio *uio);
118 ssize_t readv(int, const struct iovec *, int);
119 ssize_t writev(int, const struct iovec *, int);
121 ssize_t preadv(int, const struct iovec *, int, off_t);
122 ssize_t pwritev(int, const struct iovec *, int, off_t);
128 #endif /* !_SYS_UIO_H_ */