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copyout(9f)
copyout(9F) Kernel Functions copyout(9F)
NAME
copyout - copy data from a driver to a user program
SYNOPSIS
#include <sys/types.h>
#include <sys/ddi.h>
int copyout(const void *driverbuf, void *userbuf, size_t cn);
INTERFACE LEVEL
This interface is obsolete. ddi_copyout(9F) should be used instead.
PARAMETERS
driverbuf Source address in the driver from which the data is trans‐
ferred.
userbuf Destination address in the user program to which the data
is transferred.
cn Number of bytes moved.
DESCRIPTION
copyout() copies data from driver buffers to user data space.
Addresses that are word-aligned are moved most efficiently. However,
the driver developer is not obligated to ensure alignment. This func‐
tion automatically finds the most efficient move algorithm according to
address alignment.
RETURN VALUES
Under normal conditions, a 0 is returned to indicate a successful copy.
Otherwise, a −1 is returned if one of the following occurs:
o Paging fault; the driver tried to access a page of memory
for which it did not have read or write access.
o Invalid user address, such as a user area or stack area.
o Invalid address that would have resulted in data being
copied into the user block.
o Hardware fault; a hardware error prevented access to the
specified user memory. For example, an uncorrectable parity
or ECC error occurred.
o ADI version mismatch; the hardware detected a mismatch
between the version specified for the destination address
and the actual in-memory version. For more information, see
the adi(3C) man page.
If a −1 is returned to the caller, driver entry point routines should
return EFAULT.
CONTEXT
copyout() can be called from user context only.
EXAMPLES
Example 1 An ioctl() Routine
A driver ioctl(9E) routine (line 10) can be used to get or set device
attributes or registers. In the XX_GETREGS condition (line 17), the
driver copies the current device register values to a user data area
(line 18). If the specified argument contains an invalid address, an
error code is returned.
1 struct device { /* layout of physical device registers */
2 int control; /* physical device control word */
3 int status; /* physical device status word */
4 short recv_char; /* receive character from device */
5 short xmit_char; /* transmit character to device */
6 };
7
8 extern struct device xx_addr[]; /* phys. device regs. location */
9 . . .
10 xx_ioctl(dev_t dev, int cmd, int arg, int mode,
11 cred_t *cred_p, int *rval_p)
12 ...
13 {
14 register struct device *rp = &xx_addr[getminor(dev) >> 4];
15 switch (cmd) {
16
17 case XX_GETREGS: /* copy device regs. to user program */
18 if (copyout(rp, arg, sizeof(struct device)))
19 return(EFAULT);
20 break;
21 ...
22 }
23 ...
24 }
ATTRIBUTES
See attributes(7) for a description of the following attributes:
tab() box; cw(2.75i) |cw(2.75i) lw(2.75i) |lw(2.75i) ATTRIBUTE TYPEAT‐
TRIBUTE VALUE _ Stability LevelObsolete
SEE ALSO
attributes(7), ioctl(9E), bcopy(9F), copyin(9F), ddi_copyin(9F),
ddi_copyout(9F), uiomove(9F)
Writing Device Drivers in Oracle Solaris 11.4
NOTES
Driver writers who intend to support layered ioctls in their ioctl(9E)
routines should use ddi_copyout(9F) instead.
Driver defined locks should not be held across calls to this function.
copyout() should not be used from a streams driver. For more informa‐
tion, see M_COPYIN and M_COPYOUT in STREAMS Programming Guide.
Oracle Solaris 11.4 30 Sep 2015 copyout(9F)