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33 * @(#)uio.h 8.5 (Berkeley) 2/22/94
42 * iov_base should be a void *.
45 char *iov_base; /* Base address. */
46 size_t iov_len; /* Length. */
49 enum uio_rw { UIO_READ, UIO_WRITE };
51 /* Segment flag values. */
53 UIO_USERSPACE, /* from user data space */
54 UIO_SYSSPACE, /* from system space */
55 UIO_USERISPACE, /* from user I space */
56 UIO_NOCOPY /* don't copy, already in object */
62 struct iovec *uio_iov;
66 enum uio_seg uio_segflg;
68 struct thread *uio_td;
74 * N.B.: UIO_MAXIOV must be no less than IOV_MAX from <sys/syslimits.h>
75 * which in turn must be no less than _XOPEN_IOV_MAX from <limits.h>. If
76 * we ever make this tunable (probably pointless), then IOV_MAX should be
77 * removed from <sys/syslimits.h> and applications would be expected to use
78 * sysconf(3) to find out the correct value, or else assume the worst
79 * (_XOPEN_IOV_MAX). Perhaps UIO_MAXIOV should be simply defined as
82 #define UIO_MAXIOV 1024 /* max 1K of iov's */
83 #define UIO_SMALLIOV 8 /* 8 on stack, else malloc */
87 void uio_yield __P((void));
88 int uiomove __P((caddr_t, int, struct uio *));
89 int uiomoveco __P((caddr_t, int, struct uio *, struct vm_object *));
90 int uioread __P((int, struct uio *, struct vm_object *, int *));
91 int copyinfrom __P((const void *src, void *dst, size_t len, int seg));
92 int copyinstrfrom __P((const void *src, void *dst, size_t len,
93 size_t *copied, int seg));
97 #include <sys/cdefs.h>
100 ssize_t readv __P((int, const struct iovec *, int));
101 ssize_t writev __P((int, const struct iovec *, int));
106 #endif /* !_SYS_UIO_H_ */