Detach a major and minor number
Synopsis:
#include <sys/rsrcdbmgr.h>
#include <sys/rsrcdbmsg.h>
int rsrcdbmgr_devno_detach( dev_t devno,
int flags );
Arguments:
- devno
- A dev_t object that was returned by
rsrcdbmgr_devno_attach().
- flags
- Presently, there are no flags; pass zero for this argument.
Library:
libc
Use the -l c option to
qcc
to link against this library.
This library is usually included automatically.
Description:
The rsrcdbmgr_devno_detach() function detaches a
device number that was attached with
rsrcdbmgr_devno_attach().
The process that's detaching the device number must be the process that attached it.
Note:
In order to successfully use the
rsrcdbmgr_*() functions to modify
the resource database, your process must have the
PROCMGR_AID_RSRCDBMGR ability enabled.
For more information, see
procmgr_ability().
If you don't detach a device, it's released when the process that attached it terminates.
Returns:
- EOK
- Success.
- -1
- An error occurred
(errno is set).
Errors:
- EINTR
- The call was interrupted by a signal.
- EINVAL
- One of the following occurred:
- The major or minor device number in devno is invalid.
- The device identified by devno isn't registered.
- The calling process isn't the process that attached the device number.
- EPERM
- The calling process doesn't have the required permission; see
procmgr_ability().
Examples:
#include <sys/rsrcdbmgr.h>
#include <sys/rsrcdbmsg.h>
dev_t dev_num;
int flags=0;
…
rsrcdbmgr_devno_detach( dev_num, flags );
Classification:
QNX Neutrino
Safety: |
|
Cancellation point |
Yes |
Interrupt handler |
No |
Signal handler |
Yes |
Thread |
Yes |