NAME

uadmin − administrative control

SYNOPSIS

#include <sys/uadmin.h>

int uadmin(int cmd, int fcn, int mdep);

DESCRIPTION

uadmin provides control for basic administrative functions.  This system call is tightly coupled to the system administrative procedures and is not intended for general use.  The argument mdep is provided for machine-dependent use and is not defined here. 

As specified by cmd, the following commands are available:

A_SHUTDOWN
The system is shut down. All user processes are killed, the buffer cache is flushed, and the root file system is unmounted. The action to be taken after the system has been shut down is specified by fcn. The functions are generic; the hardware capabilities vary on specific machines.

AD_HALT Halt the processor and turn off the power. 

AD_BOOT Reboot the system, using /stand/unix. 

AD_IBOOT Interactive reboot; user is prompted for bootable program name. 

A_REBOOT The system stops immediately without any further processing.  The action to be taken next is specified by fcn as above. 

A_REMOUNT The root file system is mounted again after having been fixed.  This should be used only during the startup process. 

uadmin fails if any of the following are true:

EPERM The effective user ID is not super-user. 

DIAGNOSTICS

Upon successful completion, the value returned depends on cmd as follows:

Otherwise, a value of −1 is returned and errno is set to indicate the error.