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package proc
import (
"io/ioutil"
"path/filepath"
"strconv"
"strings"
"android/soong/finder/fs"
)
// NewProcStatus returns an instance of the ProcStatus that contains memory
// information of the process. The memory information is extracted from the
// "/proc/<pid>/status" text file. This is only available for Linux
// distribution that supports /proc.
func NewProcStatus(pid int, fileSystem fs.FileSystem) (*ProcStatus, error) {
statusFname := filepath.Join("/proc", strconv.Itoa(pid), "status")
r, err := fileSystem.Open(statusFname)
if err != nil {
return &ProcStatus{}, err
}
defer r.Close()
data, err := ioutil.ReadAll(r)
if err != nil {
return &ProcStatus{}, err
}
s := &ProcStatus{
pid: pid,
}
for _, l := range strings.Split(string(data), "\n") {
// If the status file does not contain "key: values", just skip the line
// as the information we are looking for is not needed.
if !strings.Contains(l, ":") {
continue
}
// At this point, we're only considering entries that has key, single value pairs.
kv := strings.SplitN(l, ":", 2)
fillProcStatus(s, strings.TrimSpace(kv[0]), strings.TrimSpace(kv[1]))
}
return s, nil
}
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