[v3] fix Signal import on dragonfly OS in fallback

.github/workflows/build_test.yml

@@ -16,6 +16,8 @@ jobs:
         go-version: ${{ matrix.go-version }}
     - name: Checkout code
       uses: actions/checkout@v2
+      with:
+        path: ${{ github.workspace }}/src/github.com/shirou/gopsutil
     - name: Get dependencies
       if: runner.os != 'Windows'
       run: |
@@ -24,13 +26,13 @@ jobs:
           curl https://raw.githubusercontent.com/golang/dep/master/install.sh | sh
           echo "PATH=$GOPATH/bin:$PATH" >> $GITHUB_PATH
         fi
-        cd /home/runner/work/gopsutil/gopsutil/
+        cd $GOPATH/src/github.com/shirou/gopsutil
         dep ensure
         # exclude v3 from being run with ./...
         rm -rf $GOPATH/src/github.com/shirou/gopsutil/v3
     - name: Build Test v2
       run: |
-        make build_test
+        cd $GOPATH/src/github.com/shirou/gopsutil && make build_test
   build_test_v3:
     strategy:
       matrix:

v3/process/process_fallback.go

@@ -4,12 +4,15 @@ package process
 
 import (
 	"context"
+	"syscall"
 
 	"github.com/shirou/gopsutil/v3/cpu"
 	"github.com/shirou/gopsutil/v3/internal/common"
 	"github.com/shirou/gopsutil/v3/net"
 )
 
+type Signal = syscall.Signal
+
 type MemoryMapsStat struct {
 	Path         string `json:"path"`
 	Rss          uint64 `json:"rss"`

v3/process/process_posix.go

@@ -82,7 +82,7 @@ func isMount(path string) bool {
 	if err != nil {
 		return false
 	}
-	if fileInfo.Mode() & os.ModeSymlink != 0 {
+	if fileInfo.Mode()&os.ModeSymlink != 0 {
 		return false
 	}
 	var stat1 unix.Stat_t