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ksyms.go
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/
ksyms.go
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package ebpf
import (
"bufio"
"os"
"sort"
"github.com/StackVista/stackstate-agent/pkg/process/util"
"github.com/pkg/errors"
)
// VerifyKernelFuncs ensures all kernel functions exist in ksyms located at provided path.
func VerifyKernelFuncs(path string, requiredKernelFuncs []string) ([]string, error) {
missing := make(util.SSBytes, len(requiredKernelFuncs))
for i, f := range requiredKernelFuncs {
missing[i] = []byte(f)
}
sort.Sort(missing)
f, err := os.Open(path)
if err != nil {
return nil, errors.Wrapf(err, "error reading kallsyms file from: %s", path)
}
defer f.Close()
scanner := bufio.NewScanner(f)
scanner.Split(bufio.ScanWords)
for scanner.Scan() && len(missing) > 0 {
if i := missing.Search(scanner.Bytes()); i < len(missing) {
missing = append(missing[:i], missing[i+1:]...)
}
}
missingStrs := make([]string, len(missing))
for i := range missing {
missingStrs[i] = string(missing[i])
}
return missingStrs, nil
}