12-15-2011
What computers shut off for the night??? Are you sure its not the printers they switch off?
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#include <sys/ipc.h>
#include <sys/msg.h>
int main()
{
int qid;
int t;
struct msgbuf mesg;
qid=msgget(IPC_PRIVATE,IPC_CREAT);
mesg.mtype=1L;
mesg.mtext=1;
t=msgsnd(qid,&mesg,1,0);
printf("%d",t);
}
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enable(1) General Commands Manual enable(1)
NAME
enable, disable - enable/disable LP printers
SYNOPSIS
printers
[reason]] printers
DESCRIPTION
The command activates the named printers, enabling them to print requests taken by Use to find the status of printers (see lp(1) and
lpstat(1)).
deactivates the named printers, disabling them from printing requests taken by By default, any requests that are currently printing on the
designated printers are reprinted in their entirety either on the same printer or on another member of the same class. Use to find the
status of printers.
Options
recognizes the following options:
Cancel any requests that are currently printing
on any of the designated printers.
Associate a reason with the deactivation of the printers. This reason applies to all printers mentioned up to the next option.
If the option is not present or the option is given without a reason, a default reason is used. reason is reported
by The maximum length of the reason message is 80 bytes. reason message of length greater than 80 bytes is truncated
to 80 bytes.
EXTERNAL INFLUENCES
Environment Variables
determines the language in which messages are displayed.
If is not specified or is null, it defaults to (see lang(5)).
If any internationalization variable contains an invalid setting, all internationalization variables default to (see environ(5)).
International Code Set Support
Single- and multibyte character code sets are supported.
EXAMPLES
Enable printer to accept requests:
Deactivate printer and cancel any logged jobs:
WARNINGS
If the restrict cancel feature (selected by the option -- see lpadmin(1M)) is enabled, and the user is neither administrator nor the owner
of the currently printing request on the designated printer, ignores the option.
and perform their operation on the local system only.
FILES
SEE ALSO
lp(1), lpstat(1), accept(1M), lpadmin(1M), lpsched(1M), rcancel(1M), rlp(1M), rlpdaemon(1M), rlpstat(1M).
enable(1)