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#include <sys/types.h>
#include <sys/systm.h>
The copyin() and copyin_nofault() functions copy len bytes of data from the user-space address uaddr to the kernel-space address kaddr.
The copyout() and copyout_nofault() functions copy len bytes of data from the kernel-space address kaddr to the user-space address uaddr.
The copyin_nofault() and copyout_nofault() functions require that the kernel-space and user-space data be accessible without incurring a page fault. The source and destination addresses must be physically mapped for read and write access, respectively, and neither the source nor destination addresses may be pageable.
The copystr() function copies a NUL-terminated string, at most len bytes long, from kernel-space address kfaddr to kernel-space address kdaddr. The number of bytes actually copied, including the terminating NUL, is returned in *done (if done is non- NULL).
The copyinstr() function copies a NUL-terminated string, at most len bytes long, from user-space address uaddr to kernel-space address kaddr. The number of bytes actually copied, including the terminating NUL, is returned in *done (if done is non- NULL).
COPY (9) | June 15, 2017 |
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“ | Ken Thompson has an automobile which he helped design. Unlike most automobiles, it has neither speedometer, nor gas gauge, nor any of the other numerous idiot lights which plague the modern driver. Rather, if the driver makes a mistake, a giant “?” lights up in the center of the dashboard. “The experienced driver,” says Thompson, “will usually know what's wrong.” | ” |