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