drv_priv(9F) Kernel Functions for Drivers drv_priv(9F)NAME
drv_priv - determine driver privilege
SYNOPSIS
#include <sys/types.h>
#include <sys/cred.h>
#include <sys/ddi.h>
int drv_priv(cred_t *cr);
INTERFACE LEVEL
Architecture independent level 1 (DDI/DKI).
PARAMETERS
cr Pointer to the user credential structure.
DESCRIPTION
drv_priv() provides a general interface to the system privilege policy. It determines whether the credentials supplied by the user creden-
tial structure pointed to by cr identify a process that has the {PRIV_SYS_DEVICES} privilege asserted in its effective set. This function
should be used only when file access modes, special minor device numbers, and the device policy (see privileges(5), add_drv(1M)) are insuf-
ficient to provide protection for the requested driver function. It is intended to replace all calls to suser() and any explicit checks for
effective user ID = 0 in driver code.
RETURN VALUES
This routine returns 0 if it succeeds, EPERM if it fails.
CONTEXT
drv_priv() can be called from user or interrupt context.
SEE ALSO add_drv(1M), update_drv(1M), privileges(5)
Writing Device Drivers
SunOS 5.10 29 Jan 2003 drv_priv(9F)
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drv_priv(9F) Kernel Functions for Drivers drv_priv(9F)NAME
drv_priv - determine driver privilege
SYNOPSIS
#include <sys/types.h>
#include <sys/cred.h>
#include <sys/ddi.h>
int drv_priv(cred_t *cr);
INTERFACE LEVEL
Architecture independent level 1 (DDI/DKI).
PARAMETERS
cr Pointer to the user credential structure.
DESCRIPTION
drv_priv() provides a general interface to the system privilege policy. It determines whether the credentials supplied by the user creden-
tial structure pointed to by cr identify a process that has the {PRIV_SYS_DEVICES} privilege asserted in its effective set. This function
should be used only when file access modes, special minor device numbers, and the device policy (see privileges(5), add_drv(1M)) are insuf-
ficient to provide protection for the requested driver function. It is intended to replace all calls to suser() and any explicit checks for
effective user ID = 0 in driver code.
RETURN VALUES
This routine returns 0 if it succeeds, EPERM if it fails.
CONTEXT
drv_priv() can be called from user or interrupt context.
SEE ALSO add_drv(1M), update_drv(1M), privileges(5)
Writing Device Drivers
SunOS 5.10 29 Jan 2003 drv_priv(9F)
What is the point of this? Whenever I close my shell it appends to the history file without adding this. I have never seen it overwrite my history file.
# When the shell exits, append to the history file instead of overwriting it
shopt -s histappend (3 Replies)