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listby.go
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listby.go
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/*
not all distros have support for /dev/serial
actual device file is key
by-id or by-path
*/
package listserialports
import (
"os"
"strings"
)
var serialFS = os.DirFS("/dev/serial/")
func ListById() (map[string]string, error) {
lst, errList := ReadDirEntryArr(serialFS, "by-id")
if errList != nil {
return nil, errList
}
dirlist := lst.FilesOnly("/dev/serial/by-id")
result := make(map[string]string)
for _, fname := range dirlist {
target, linkErr := symlinkEval.Eval(fname)
if linkErr == nil { //Just skip non-links
result[strings.Replace(target, "../../", "/dev/", 1)] = fname
}
}
return result, nil
}
func ListByPath() (map[string]string, error) {
lst, errList := ReadDirEntryArr(serialFS, "by-path")
if errList != nil {
return nil, errList
}
dirlist := lst.FilesOnly("/dev/serial/by-path")
result := make(map[string]string)
for _, fname := range dirlist {
target, linkErr := symlinkEval.Eval(fname)
if linkErr == nil { //Just skip non-links
result[strings.Replace(target, "../../", "/dev/", 1)] = fname
}
}
return result, nil
}
//ListDev lists serial ports named directly under /dev/ old fashioned (or minimal system)
func ListByDev() ([]string, error) {
serialDevPrefixes, errPrefixes := ListOfSerialTTYDriverPrefixes()
if errPrefixes != nil {
return []string{}, nil
}
devdir, errList := ReadDirEntryArr(devFS, ".")
if errList != nil {
return []string{}, errList
}
filelist := devdir.FilesOnly("/dev/")
result := []string{}
for _, name := range filelist {
for _, prefix := range serialDevPrefixes {
if strings.HasPrefix(name, prefix) {
result = append(result, name)
}
}
}
return result, nil
}