Add openbsd and dragonfly support to shm

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

tools/utils/shm/shm_openbsd.go

@@ -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)
-
-}

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
+}

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
+}

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
+}

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
+}