svcadm(8)을 검색하려면 섹션에서 8 을 선택하고, 맨 페이지 이름에 svcadm을 입력하고 검색을 누른다.
ioctl(2)
ioctl(2) System Calls ioctl(2)
NAME
ioctl - control device
SYNOPSIS
#include <unistd.h>
#include <stropts.h>
int ioctl(int fildes, int request, /* arg */ ...);
DESCRIPTION
The ioctl() function performs a variety of control functions on devices
and streams. For non-streams files, the functions performed by this
call are device-specific control functions. The request argument and an
optional third argument with varying type are passed to the file desig‐
nated by fildes and are interpreted by the device driver.
For streams files, specific functions are performed by the ioctl()
function as described in streamio(4I).
The fildes argument is an open file descriptor that refers to a device.
The request argument selects the control function to be performed and
depends on the device being addressed. The arg argument represents a
third argument that has additional information that is needed by this
specific device to perform the requested function. The data type of arg
depends upon the particular control request, but it is either an int or
a pointer to a device-specific data structure.
In addition to device-specific and streams functions, generic functions
are provided by more than one device driver. The manual pages in Sec‐
tion 4I cover ioctl requests which apply to a class of drivers or sub‐
systems. For example, see the termio(4I) manual page for documentation
of the general terminal interface.
RETURN VALUES
Upon successful completion, the value returned depends upon the device
control function, but must be a non-negative integer. Otherwise, −1 is
returned and errno is set to indicate the error.
ERRORS
The ioctl() function will fail for any type of file if:
EBADF The fildes argument is not a valid open file descriptor.
EINTR A signal was caught during the execution of the ioctl() func‐
tion.
EINVAL The stream or multiplexer referenced by fildes is linked (di‐
rectly or indirectly) downstream from a multiplexer.
The ioctl() function will also fail if the device driver detects an er‐
ror. In this case, the error is passed through ioctl() without change
to the caller. A particular driver might not have all of the following
error cases. Under the following conditions, requests to device drivers
may fail and set errno to indicate the error.
EFAULT The request argument requires a data transfer to or from a
buffer pointed to by arg, but arg points to an illegal ad‐
dress.
EINVAL The request or arg argument is not valid for this device.
EIO Some physical I/O error has occurred.
ENOLINK The fildes argument is on a remote machine and the link to
that machine is no longer active.
ENOTTY For a streamio(4I) request, the fildes argument is not as‐
sociated with a streams device that accepts control func‐
tions.
For other request values, the request is not valid for the
given filedes, such as specifying a file that is not a spe‐
cial character device, or specifying a request that is not
supported for the given device.
ENXIO The request and arg arguments are valid for this device dri‐
ver, but the service requested can not be performed on this
particular subdevice.
ENODEV The fildes argument refers to a valid streams device, but
the corresponding device driver does not support the ioctl()
function.
Streams errors are described in streamio(4I).
ATTRIBUTES
See attributes(7) for descriptions of the following attributes:
tab() box; cw(2.75i) |cw(2.75i) lw(2.75i) |lw(2.75i) ATTRIBUTE TYPEAT‐
TRIBUTE VALUE _ Interface StabilityCommitted _ StandardSee stan‐
dards(7).
SEE ALSO
streamio(4I), termio(4I), attributes(7), standards(7)
HISTORY
The ioctl() function has been included in all Sun and Oracle releases
of Solaris.
Oracle Solaris 11.4 30 Jan 2023 ioctl(2)