copy(9) - NetBSD Manual Pages

COPY(9)                NetBSD Kernel Developer's Manual                COPY(9)


NAME
copy, copyin, copyout, copystr, copyinstr, copyoutstr -- kernel space to/from user space copy functions
SYNOPSIS
#include <sys/types.h> #include <sys/systm.h> int copyin(const void *uaddr, void *kaddr, size_t len); int copyout(const void *kaddr, void *uaddr, size_t len); int copystr(const void *kfaddr, void *kdaddr, size_t len, size_t *done); int copyinstr(const void *uaddr, void *kaddr, size_t len, size_t *done); int copyoutstr(const void *kaddr, void *uaddr, size_t len, size_t *done); int copyin_proc(struct proc *p, const void *uaddr, void *kaddr, size_t len); int copyout_proc(struct proc *p, const void *kaddr, void *uaddr, size_t len); int ioctl_copyin(int ioctlflags, const void *src, void *dst, size_t len); int ioctl_copyout(int ioctlflags, const void *src, void *dst, size_t len);
DESCRIPTION
The copy functions are designed to copy contiguous data from one address to another. All but copystr() copy data from user-space to kernel-space or vice-versa. The copy routines provide the following functionality: copyin() Copies len bytes of data from the user-space address uaddr in the current process to the kernel-space address kaddr. copyout() Copies len bytes of data from the kernel-space address kaddr to the user-space address uaddr in the current process. copystr() Copies a NUL-terminated string, at most len bytes long, from kernel-space address kfaddr to kernel-space address kdaddr. If the done argument is non-NULL, the number of bytes actually copied, including the terminating NUL, is returned in *done. copyinstr() Copies a NUL-terminated string, at most len bytes long, from user-space address uaddr in the current process to kernel-space address kaddr. If the done argument is non- NULL, the number of bytes actually copied, including the terminating NUL, is returned in *done. copyoutstr() Copies a NUL-terminated string, at most len bytes long, from kernel-space address kaddr to user-space address uaddr in the current process. If the done argument is non-NULL, the number of bytes actually copied, including the terminating NUL, is returned in *done. copyin_proc() Like copyin(), except it operates on the address space of the process p. copyout_proc() Like copyout(), except it operates on the address space of the process p. ioctl_copyin() Like copyin(), except it operates on kernel adresses when the FKIOCTL flag is passed in ioctlflags from the ioctl call. ioctl_copyout() Like copyout(), except it operates on kernel adresses when the FKIOCTL flag is passed in ioctlflags from the ioctl call.
RETURN VALUES
The copy functions return 0 on success or EFAULT if a bad address is encountered. In addition, the copystr(), copyinstr(), and copyoutstr() functions return ENAMETOOLONG if the string is longer than len bytes.
SEE ALSO
fetch(9), store(9) NetBSD 7.1_STABLE August 28, 2005 NetBSD 7.1_STABLE

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