M4andCursor
57d719f02f
Faster unchanged polls; orphan-core cleanup on listen ports; clearer busy-port errors; cores only from binDir; incremental server list; CSP without Google Fonts; single-instance activates existing window; close-to-tray without kill-others or balloon. Co-authored-by: Cursor <cursoragent@cursor.com>
37 lines
754 B
Go
37 lines
754 B
Go
//go:build !windows
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package singleinstance
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import (
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"fmt"
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"os"
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"path/filepath"
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)
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// Lock uses an exclusive lock file under the user config dir when available.
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func Lock(appName string) (func(), error) {
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if appName == "" {
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appName = "Navis"
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}
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dir, err := os.UserConfigDir()
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if err != nil {
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return func() {}, nil
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}
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path := filepath.Join(dir, appName, "singleinstance.lock")
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if err := os.MkdirAll(filepath.Dir(path), 0o755); err != nil {
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return func() {}, nil
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}
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f, err := os.OpenFile(path, os.O_CREATE|os.O_RDWR, 0o600)
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if err != nil {
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return func() {}, nil
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}
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if err := flockExclusive(f); err != nil {
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_ = f.Close()
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return nil, fmt.Errorf("%w", ErrAlreadyRunning)
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}
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return func() {
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_ = funlock(f)
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_ = f.Close()
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}, nil
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}
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