add tracing feature for package gproc (#1923)

example/trace/processes/gcmd/main.go

@@ -0,0 +1,25 @@
+package main
+
+import (
+	"context"
+
+	"github.com/gogf/gf/v2/frame/g"
+	"github.com/gogf/gf/v2/os/gcmd"
+	"github.com/gogf/gf/v2/os/gctx"
+	"github.com/gogf/gf/v2/os/gproc"
+)
+
+var (
+	Main = &gcmd.Command{
+		Name:  "main",
+		Brief: "main process",
+		Func: func(ctx context.Context, parser *gcmd.Parser) (err error) {
+			g.Log().Debug(ctx, `this is main process`)
+			return gproc.ShellRun(ctx, `go run sub/sub.go`)
+		},
+	}
+)
+
+func main() {
+	Main.Run(gctx.New())
+}

example/trace/processes/gcmd/sub/sub.go

@@ -0,0 +1,24 @@
+package main
+
+import (
+	"context"
+
+	"github.com/gogf/gf/v2/frame/g"
+	"github.com/gogf/gf/v2/os/gcmd"
+	"github.com/gogf/gf/v2/os/gctx"
+)
+
+var (
+	Sub = &gcmd.Command{
+		Name:  "sub",
+		Brief: "sub process",
+		Func: func(ctx context.Context, parser *gcmd.Parser) (err error) {
+			g.Log().Debug(ctx, `this is sub process`)
+			return nil
+		},
+	}
+)
+
+func main() {
+	Sub.Run(gctx.New())
+}