From 6ace082bc2f480eb5138c3fee7526e5136d2c9fe Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Tue, 20 Dec 2022 20:53:52 +0530
Subject: [PATCH] Add openbsd and dragonfly support to shm

---
 tools/utils/shm/shm_fs.go             |  3 +-
 tools/utils/shm/shm_openbsd.go        | 40 ---------------------------
 tools/utils/shm/specific_dragonfly.go | 16 +++++++++++
 tools/utils/shm/specific_linux.go     |  5 +++-
 tools/utils/shm/specific_netbsd.go    |  5 +++-
 tools/utils/shm/specific_openbsd.go   | 21 ++++++++++++++
 6 files changed, 47 insertions(+), 43 deletions(-)
 delete mode 100644 tools/utils/shm/shm_openbsd.go
 create mode 100644 tools/utils/shm/specific_dragonfly.go
 create mode 100644 tools/utils/shm/specific_openbsd.go

diff --git a/tools/utils/shm/shm_fs.go b/tools/utils/shm/shm_fs.go
index dbadff30c..50836b847 100644
--- a/tools/utils/shm/shm_fs.go
+++ b/tools/utils/shm/shm_fs.go
@@ -1,5 +1,5 @@
 // License: GPLv3 Copyright: 2022, Kovid Goyal, <kovid at kovidgoyal.net>
-//go:build linux || netbsd
+//go:build linux || netbsd || openbsd || dragonfly
 
 package shm
 
@@ -12,6 +12,7 @@ import (
 var _ = fmt.Print
 
 func create_temp(pattern string, size uint64) (MMap, error) {
+	pattern = modify_pattern(pattern)
 	ans, err := os.CreateTemp(SHM_DIR, pattern)
 	if err != nil {
 		return nil, err
diff --git a/tools/utils/shm/shm_openbsd.go b/tools/utils/shm/shm_openbsd.go
deleted file mode 100644
index d96f5e3b4..000000000
--- a/tools/utils/shm/shm_openbsd.go
+++ /dev/null
@@ -1,40 +0,0 @@
-// License: GPLv3 Copyright: 2022, Kovid Goyal, <kovid at kovidgoyal.net>
-
-package shm
-
-import (
-	"fmt"
-	"os"
-	"path/filepath"
-)
-
-var _ = fmt.Print
-
-const SHM_DIR = "/tmp"
-
-func create_temp(pattern string) (*os.File, error) {
-	ans, err := os.CreateTemp(SHM_DIR, pattern)
-	if err != nil {
-		return nil, err
-	}
-	return ans, nil
-}
-
-func Open(name string) (*os.File, error) {
-	if !filepath.IsAbs(name) {
-		name = filepath.Join(SHM_DIR, name)
-	}
-	ans, err := os.OpenFile(name, os.O_RDONLY, 0)
-	if err != nil {
-		return nil, err
-	}
-	return ans, nil
-}
-
-func Unlink(name string) error {
-	if !filepath.IsAbs(name) {
-		name = filepath.Join(SHM_DIR, name)
-	}
-	return os.Remove(name)
-
-}
diff --git a/tools/utils/shm/specific_dragonfly.go b/tools/utils/shm/specific_dragonfly.go
new file mode 100644
index 000000000..2b8fdb22c
--- /dev/null
+++ b/tools/utils/shm/specific_dragonfly.go
@@ -0,0 +1,16 @@
+// License: GPLv3 Copyright: 2022, Kovid Goyal, <kovid at kovidgoyal.net>
+
+package shm
+
+import (
+	"fmt"
+)
+
+var _ = fmt.Print
+
+// https://www.dragonflybsd.org/cgi/web-man?command=shm_open&section=3
+const SHM_DIR = "/var/run/shm"
+
+func modify_pattern(pattern string) string {
+	return pattern
+}
diff --git a/tools/utils/shm/specific_linux.go b/tools/utils/shm/specific_linux.go
index 486ef3eca..bc9e94dcf 100644
--- a/tools/utils/shm/specific_linux.go
+++ b/tools/utils/shm/specific_linux.go
@@ -9,4 +9,7 @@ import (
 var _ = fmt.Print
 
 const SHM_DIR = "/dev/shm"
-const SHM_NAME_MAX = 1023
+
+func modify_pattern(pattern string) string {
+	return pattern
+}
diff --git a/tools/utils/shm/specific_netbsd.go b/tools/utils/shm/specific_netbsd.go
index 875b22e54..e8bd8d2c4 100644
--- a/tools/utils/shm/specific_netbsd.go
+++ b/tools/utils/shm/specific_netbsd.go
@@ -9,4 +9,7 @@ import (
 var _ = fmt.Print
 
 const SHM_DIR = "/var/shm"
-const SHM_NAME_MAX = 1023
+
+func modify_pattern(pattern string) string {
+	return pattern
+}
diff --git a/tools/utils/shm/specific_openbsd.go b/tools/utils/shm/specific_openbsd.go
new file mode 100644
index 000000000..b571b593f
--- /dev/null
+++ b/tools/utils/shm/specific_openbsd.go
@@ -0,0 +1,21 @@
+// License: GPLv3 Copyright: 2022, Kovid Goyal, <kovid at kovidgoyal.net>
+
+package shm
+
+import (
+	"fmt"
+)
+
+var _ = fmt.Print
+
+const SHM_DIR = "/tmp"
+
+func modify_pattern(pattern string) string {
+	// https://github.com/openbsd/src/blob/master/lib/libc/gen/shm_open.c
+	if strings.Contains(pattern, "*") {
+		pattern += ".shm"
+	} else {
+		pattern += "*.shm"
+	}
+	return pattern
+}