On Tue, Aug 26, 2003 at 03:00:23PM -0500 or thereabouts, Charles Howse wrote:
Try this:
% perl
use POSIX qw/:fcntl_h dup2 setsid/;
if (fork) { exit; }
setsid;
my $fd = POSIX::open /dev/null, O_WRONLY or die Can't open
/dev/null: $!\n;
dup2 $fd, 0;
dup2 $fd, 1;
dup2 $fd, 2;
sleep 5;
system sudo mount /dev/fd0 /mnt;
%# wait for an error within 5 seconds or so
If no error appears, I think you forgot the / on /dev/null up
there :-) Make
sure to unmount the floppy afterwards.
If there is an error, it proves that it was/is a kernel message.
Looks good, now...I have to insert this perl code into a bash script as
a function.
This generates a syntax error:
#!/usr/local/bin/bash
Chkflp(){
/usr/bin/perl
add EOF to the end of this line
use POSIX qw/:fcntl_h dup2 setsid/;
if (fork) { exit; }
setsid;
my $fd = POSIX::open /dev/null, O_WRONLY or die Can't open
/dev/null: $!\n;
dup2 $fd, 0;
dup2 $fd, 1;
dup2 $fd, 2;
sleep 5;
put EOF on a new line here
}
remainder of bash script
But I think you misunderstood me.
This script will check to see whether you *can* trap the error. Run it manually
on the command line, wait a few seconds, see if you get an error w/o a floppy in
the drive. If no error, great; put this in bash script:
FloppyInDrive() {
perl 'EOF'
use POSIX;
my $fd = POSIX::open /dev/null, POSIX::O_WRONLY or die can't open /dev/null;
dup2 $fd, $_ for (0, 1, 2);
exec dd if=/dev/fd0 of=/dev/null bs=1k count=1;
EOF
return $?
}
until FloppyInDrive; do echo please insert floppy and press enter; read key; done
--
Something like that. This is how it looks on my Linux box (sorry, no FreeBSD example
yet):
bash-2.05a# FloppyInDrive() {
perl 'EOF'
use POSIX;
my $fd = POSIX::open /dev/null, POSIX::O_WRONLY or die can't open /dev/null;
dup2 $fd, $_ for (0, 1, 2);
exec dd if=/dev/floppy/0 of=/dev/null bs=1k count=1;
EOF
return $?
}
bash-2.05a#
insert floppy
bash-2.05a# until FloppyInDrive; do echo please insert floppy and press enter; read
key; done
eject floppy
bash-2.05a# SysRq : Changing Loglevel
Loglevel set to 9
until FloppyInDrive; do echo please insert floppy and press enter; read key; done
end_request: I/O error, dev 02:00 (floppy), sector 0
please insert floppy and press enter
end_request: I/O error, dev 02:00 (floppy), sector 0
please insert floppy and press enter
insert floppy
eject floppy
bash-2.05a# SysRq : Changing Loglevel
Loglevel set to 3
until FloppyInDrive; do echo please insert floppy and press enter; read key; done
please insert floppy and press enter
please insert floppy and press enter
insert floppy
bash-2.05a#
If the original errors, well, maybe the above will work anyway. Maybe it won't. Oh
well.
-- Josh
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