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84 lines
2.3 KiB
84 lines
2.3 KiB
4 months ago
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/*
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* Copyright © 2013 Intel Corporation
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <string.h>
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#include <errno.h>
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#include "cpu-top.h"
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int cpu_top_init(struct cpu_top *cpu)
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{
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memset(cpu, 0, sizeof(*cpu));
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cpu->nr_cpu = sysconf(_SC_NPROCESSORS_ONLN);
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return 0;
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}
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int cpu_top_update(struct cpu_top *cpu)
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{
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struct cpu_stat *s = &cpu->stat[cpu->count++&1];
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struct cpu_stat *d = &cpu->stat[cpu->count&1];
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uint64_t d_total, d_idle;
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char buf[4096], *b;
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int fd, len = -1;
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fd = open("/proc/stat", 0);
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if (fd < 0)
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return errno;
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len = read(fd, buf, sizeof(buf)-1);
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close(fd);
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if (len < 0)
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return EIO;
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buf[len] = '\0';
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#ifdef __x86_64__
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sscanf(buf, "cpu %lu %lu %lu %lu",
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&s->user, &s->nice, &s->sys, &s->idle);
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#else
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sscanf(buf, "cpu %llu %llu %llu %llu",
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&s->user, &s->nice, &s->sys, &s->idle);
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#endif
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b = strstr(buf, "procs_running");
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if (b)
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cpu->nr_running = atoi(b+sizeof("procs_running")) - 1;
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s->total = s->user + s->nice + s->sys + s->idle;
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if (cpu->count == 1)
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return EAGAIN;
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d_total = s->total - d->total;
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d_idle = s->idle - d->idle;
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cpu->busy = 100 - 100 * d_idle / d_total;
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return 0;
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}
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