uadmin − administrative control
int uadmin(int cmd, int fcn, uintptr_t mdep);
The uadmin() function provides control for basic administrative functions. This function 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:
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.
Halt the processor(s).
Halt the processor(s) and turn off the power.
Reboot the system, using the kernel file.
Interactive reboot; user is prompted for bootable program name.
The system stops immediately without any further processing. The action to be taken next is specified by fcn as above.
The system is forced to panic immediately without any further processing and a crash dump is written to the dump device (see dumpadm(1M)). The action to be taken next is specified by fcn as above.
The root file system is mounted again after having been fixed. This should be used only during the startup process.
Suspend the whole system. The
system state is preserved in the state file. The following
three subcommands are available.
Save the system state to the state file with compression of data.
Check if your system supports suspend and resume. Without performing a system suspend/resume, this command checks if this feature is currently available on your system.
Force AD_COMPRESS even when threads of user applications are not suspendable.
completion, the value returned depends on cmd as
0 upon resume.
Otherwise, −1 is returned and errno is set to indicate the error.
The uadmin() function will fail if:
The effective user of the calling process is not super-user.
Suspend/resume ran out of physical memory.
Suspend/resume could not allocate enough space on the root file system to store system information.
Suspend/resume not supported on this platform.
Unable to successfully suspend system.
Suspend already in progress.