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