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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_NOCOPY /* don't copy, already in object */
61 struct iovec *uio_iov;
65 enum uio_seg uio_segflg;
67 struct thread *uio_td;
73 * N.B.: UIO_MAXIOV must be no less than IOV_MAX from <sys/syslimits.h>
74 * which in turn must be no less than _XOPEN_IOV_MAX from <limits.h>. If
75 * we ever make this tunable (probably pointless), then IOV_MAX should be
76 * removed from <sys/syslimits.h> and applications would be expected to use
77 * sysconf(3) to find out the correct value, or else assume the worst
78 * (_XOPEN_IOV_MAX). Perhaps UIO_MAXIOV should be simply defined as
81 #define UIO_MAXIOV 1024 /* max 1K of iov's */
82 #define UIO_SMALLIOV 8 /* 8 on stack, else malloc */
87 int uiomove(caddr_t, int, struct uio *);
88 int uiomoveco(caddr_t, int, struct uio *, struct vm_object *, int);
89 int uioread(int, struct uio *, struct vm_object *, int *);
90 int copyinfrom(const void *src, void *dst, size_t len, int seg);
91 int copyinstrfrom(const void *src, void *dst, size_t len,
92 size_t *copied, int seg);
96 #include <sys/cdefs.h>
99 ssize_t readv(int, const struct iovec *, int);
100 ssize_t writev(int, const struct iovec *, int);
105 #endif /* !_SYS_UIO_H_ */