82 lines
2.4 KiB
C++
82 lines
2.4 KiB
C++
/*******************************************************************************
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Copyright(C) Jonas 'Sortie' Termansen 2011.
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This program is free software: you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by the Free
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Software Foundation, either version 3 of the License, or (at your option)
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any later version.
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This program is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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more details.
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You should have received a copy of the GNU General Public License along with
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this program. If not, see <http://www.gnu.org/licenses/>.
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memstat.cpp
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Prints system memory usage information.
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*******************************************************************************/
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#include <err.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <string.h>
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void printbytes(unsigned long long bytes)
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{
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const unsigned BYTES = 0;
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const unsigned KIBI = 1;
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const unsigned MEBI = 2;
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const unsigned GIBI = 3;
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const unsigned TEBI = 4;
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const unsigned PEBI = 5;
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const unsigned EXBI = 6;
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unsigned unit = BYTES;
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if ( (bytes >> 10ULL) & 1023ULL ) { unit = KIBI; }
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if ( (bytes >> 20ULL) & 1023ULL ) { unit = MEBI; }
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if ( (bytes >> 30ULL) & 1023ULL ) { unit = GIBI; }
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if ( (bytes >> 40ULL) & 1023ULL ) { unit = TEBI; }
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if ( (bytes >> 50ULL) & 1023ULL ) { unit = PEBI; }
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if ( (bytes >> 60ULL) & 1023ULL ) { unit = EXBI; }
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switch ( unit )
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{
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case EXBI:
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printf("%llu ZiB ", (bytes >> 60ULL) & 1023ULL);
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case PEBI:
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printf("%llu PiB ", (bytes >> 50ULL) & 1023ULL);
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case TEBI:
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printf("%llu TiB ", (bytes >> 40ULL) & 1023ULL);
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case GIBI:
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printf("%llu GiB ", (bytes >> 30ULL) & 1023ULL);
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case MEBI:
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printf("%llu MiB ", (bytes >> 20ULL) & 1023ULL);
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case KIBI:
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printf("%llu KiB", (bytes >> 10ULL) & 1023ULL);
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break;
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case BYTES:
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printf("%llu B", (bytes >> 0ULL) & 1023ULL);
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}
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}
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int main(int /*argc*/, char* /*argv*/[])
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{
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size_t memused = 0;
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size_t memtotal = 0;
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if ( memstat(&memused, &memtotal) )
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err(1, "memstat");
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printf("memory usage: ");
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printbytes(memused);
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printf(" used / ");
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printbytes(memtotal);
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unsigned percent = ((unsigned long long) memused * 100ULL ) / memtotal;
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printf(" total (%u%s)\n", percent, "%");
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return 0;
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}
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