76 lines
1.9 KiB
Matlab
76 lines
1.9 KiB
Matlab
function host = FindFreeSSH(host_list, wait_time, command)
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% function host = FindFreeSSH(host_list, wait_time, command)
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%
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% Find a free ssh host not running openEMS
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%
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% internal function used by RunOpenEMS
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%
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% host_list: give a list of possible host
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%
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% wait_time: wait x seconds after not finding a free host and rechecking
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% default: 600 seconds
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%
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% command: unix command to check for free host (empty result --> free)
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% default: 'ps -e | grep openEMS'
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%
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% See also RunOpenEMS
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%
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% openEMS matlab interface
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% -----------------------
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% author: Thorsten Liebig
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if (nargin<3)
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% command which should return an empty string if host is available
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command = 'ps -e | grep openEMS';
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end
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if (nargin<2)
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wait_time = 600;
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end
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if ischar(host_list)
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fid=fopen(host_list);
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if (fid==-1)
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error('FindFreeSSH: cant open host file');
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end
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clear host_list;
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host_list = {};
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while 1
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line = fgetl(fid);
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if ischar(line)
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host_list{end+1} = line;
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else
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break;
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end
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end
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fclose(fid);
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elseif ~iscell(host_list)
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error('FindFreeSSH: unknown host list format');
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end
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while 1
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for n = 1:numel(host_list)
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host = host_list{n};
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[status, result] = unix(['ssh ' host ' ' command]);
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if (isempty(result) && status==1)
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disp(['FindFreeSSH:: found a free host: ' host ]);
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return
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elseif (~isempty(result) && status==0)
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disp(['FindFreeSSH:: ' host ' is busy running openEMS ... ' ]);
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else
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disp(['FindFreeSSH:: shh connection to ' host ' failed ... ' ]);
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end
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end
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host = '';
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if (wait_time<=0)
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warning('openEMS:FindFreeSSH',' unable to find a free host ');
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return
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end
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disp([' no free host found waiting for ' num2str(wait_time) ' seconds ... '])
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pause(wait_time)
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end |