| 17 | } |
| 18 | |
| 19 | int linux_open(uint8_t cpu, enum SysModes mode) { |
| 20 | int fmode; |
| 21 | char fn[32]; |
| 22 | switch (mode) { |
| 23 | case SYS_RDWR: |
| 24 | fmode = O_RDWR; |
| 25 | break; |
| 26 | case SYS_WRONLY: |
| 27 | fmode = O_WRONLY; |
| 28 | break; |
| 29 | case SYS_RDONLY: |
| 30 | default: |
| 31 | fmode = O_RDONLY; |
| 32 | break; |
| 33 | } |
| 34 | if (cpu >= MAX_CORES) { |
| 35 | fprintf(stderr, "%s: only cores 0-%d are supported. requested=%d\n", __func__, MAX_CORES, cpu); |
| 36 | return 0; |
| 37 | } |
| 38 | if (snprintf(fn, sizeof(fn), "/dev/cpu/%d/msr", cpu) == -1) { |
| 39 | fprintf(stderr, "%s: snprintf: %s\n", __func__, strerror(errno)); |
| 40 | return 0; |
| 41 | } |
| 42 | msr_fd[cpu] = open(fn, fmode); |
| 43 | if (-1 == msr_fd[cpu]) { |
| 44 | fprintf(stderr, "open(%s): %s\n", fn, strerror(errno)); |
| 45 | return 0; |
| 46 | } |
| 47 | return 1; |
| 48 | } |
| 49 | |
| 50 | int linux_close(uint8_t cpu) { |
| 51 | int ret; |