59 lines
1.3 KiB
Go
59 lines
1.3 KiB
Go
package main
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import (
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"os"
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"strconv"
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"strings"
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)
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// Process contains an alias that will be returned when queries, and a process
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// name to look for.
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type Process struct {
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Alias string `json:"alias"`
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Process string `json:"process"`
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}
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// ProcessesState is a map of processes' aliases and its statuses.
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type ProcessesState map[string]bool
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func GetProcessesState(procs *[]Process) (ps ProcessesState) {
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ps = make(ProcessesState)
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for _, proc := range *procs {
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pids, err := GetProcessPIDs(proc.Process)
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ps[proc.Alias] = err == nil && len(pids) > 0
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}
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return
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}
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// GetProcessPIDs returns a list of PIDs found for a process.
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func GetProcessPIDs(name string) (pids []int, err error) {
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dir, err := os.ReadDir("/proc/")
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if err != nil {
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return nil, err
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}
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for _, entry := range dir {
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// This line demands a little clarification. Here we are making sure
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// that the first character of a directory name is numeric. In ASCII
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// all numerals are laying within 0x30-0x39 range.
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if entry.IsDir() && entry.Name()[0]>>0x4&0xf == 0x3 {
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cmdline, err := os.ReadFile("/proc/" + entry.Name() + "/cmdline")
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if err != nil {
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return nil, err
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}
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if strings.Contains(string(cmdline), name) {
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pid, err := strconv.Atoi(entry.Name())
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if err != nil {
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continue
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}
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pids = append(pids, pid)
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}
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}
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}
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return pids, nil
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}
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