51f85ba032
* Use std::sting instead of char[] in the graph drawing functions. This is the only change to the code. Rest is just styling. * Corrected whole code to follow Allman/GNU coding style, with 2 spaces for each indentation step. * Added license headers to all code files * Added vim modelines to all files. They sit on the first line and enable the following settings: 2 space indentation, tab expansion to spaces, line at 80th column, automatic line breaking on "\ !@*+-;:,./?" characters, automatic line break if line exceeds 80 colums. This should keep the code nice and tidy.
71 lines
2.0 KiB
C++
71 lines
2.0 KiB
C++
/* vim: tabstop=2 shiftwidth=2 expandtab textwidth=80 linebreak wrap
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*
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* Copyright 2012 Matthew McCormick
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* Copyright 2015 Pawel 'l0ner' Soltys
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <string>
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#include <fstream>
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#include <unistd.h> // usleep
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#include "cpu.h"
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#include "../luts.h"
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float cpu_percentage( unsigned cpu_usage_delay )
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{
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std::string line;
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size_t substr_start = 0;
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size_t substr_len;
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// cpu stats
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// user, nice, system, idle
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// in that order
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unsigned long long stats[4];
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std::ifstream stat_file( "/proc/stat" );
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getline( stat_file, line );
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stat_file.close();
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// skip "cpu"
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substr_len = line.find_first_of( " ", 3 );
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// parse cpu line
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for( unsigned i=0; i < 4; i++ )
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{
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substr_start = line.find_first_not_of( " ", substr_len );
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substr_len = line.find_first_of( " ", substr_start );
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stats[i] = std::stoll( line.substr( substr_start, substr_len ) );
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}
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usleep( cpu_usage_delay );
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stat_file.open( "/proc/stat" );
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getline( stat_file, line );
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stat_file.close();
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// skip "cpu"
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substr_len = line.find_first_of( " ", 3 );
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// parse cpu line
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for( unsigned i=0; i < 4; i++ )
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{
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substr_start = line.find_first_not_of( " ", substr_len );
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substr_len = line.find_first_of ( " ", substr_start );
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stats[i] = std::stoll( line.substr( substr_start, substr_len ) ) - stats[i];
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}
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return static_cast<float>( stats[0] + stats[1] + stats[2]) /
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static_cast<float>( stats[0] + stats[1] + stats[2] + stats[3] ) * 100.0;
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}
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