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ioctl(2)                         System Calls                         ioctl(2)

       ioctl - control device

       #include <unistd.h>
       #include <stropts.h>

       int ioctl(int fildes, int request, /* arg */ ...);

       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 (for example, the general
       terminal interface.) See termio(4I)).

       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.

       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‐

       EINVAL    The  stream  or  multiplexer  referenced  by fildes is linked
                 (directly or indirectly) downstream from a multiplexer.

       The ioctl() function will also fail if the  device  driver  detects  an
       error. 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

       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     The  fildes argument is not associated with a streams device
                  that accepts control functions.

       ENXIO      The request and arg arguments  are  valid  for  this  device
                  driver,  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()

       Streams errors are described in streamio(4I).

       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‐

       streamio(4I), termio(4I), attributes(7), standards(7)

Oracle Solaris 11.4               15 Feb 1996                         ioctl(2)
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