diff options
Diffstat (limited to 'vendor/github.com/cilium/ebpf/internal/cpu.go')
-rw-r--r-- | vendor/github.com/cilium/ebpf/internal/cpu.go | 62 |
1 files changed, 0 insertions, 62 deletions
diff --git a/vendor/github.com/cilium/ebpf/internal/cpu.go b/vendor/github.com/cilium/ebpf/internal/cpu.go deleted file mode 100644 index 3affa1efb..000000000 --- a/vendor/github.com/cilium/ebpf/internal/cpu.go +++ /dev/null @@ -1,62 +0,0 @@ -package internal - -import ( - "fmt" - "os" - "strings" - "sync" -) - -var sysCPU struct { - once sync.Once - err error - num int -} - -// PossibleCPUs returns the max number of CPUs a system may possibly have -// Logical CPU numbers must be of the form 0-n -func PossibleCPUs() (int, error) { - sysCPU.once.Do(func() { - sysCPU.num, sysCPU.err = parseCPUsFromFile("/sys/devices/system/cpu/possible") - }) - - return sysCPU.num, sysCPU.err -} - -func parseCPUsFromFile(path string) (int, error) { - spec, err := os.ReadFile(path) - if err != nil { - return 0, err - } - - n, err := parseCPUs(string(spec)) - if err != nil { - return 0, fmt.Errorf("can't parse %s: %v", path, err) - } - - return n, nil -} - -// parseCPUs parses the number of cpus from a string produced -// by bitmap_list_string() in the Linux kernel. -// Multiple ranges are rejected, since they can't be unified -// into a single number. -// This is the format of /sys/devices/system/cpu/possible, it -// is not suitable for /sys/devices/system/cpu/online, etc. -func parseCPUs(spec string) (int, error) { - if strings.Trim(spec, "\n") == "0" { - return 1, nil - } - - var low, high int - n, err := fmt.Sscanf(spec, "%d-%d\n", &low, &high) - if n != 2 || err != nil { - return 0, fmt.Errorf("invalid format: %s", spec) - } - if low != 0 { - return 0, fmt.Errorf("CPU spec doesn't start at zero: %s", spec) - } - - // cpus is 0 indexed - return high + 1, nil -} |