Introduce Path#isSpecialFile, FileSystem#isSpecialFile, and FileStatus#isSpecialFile to help disambiguate between a regular file and a special file, since the file size of a special file cannot be trusted.

--
MOS_MIGRATED_REVID=105903622

2 files changed, 30 insertions, 0 deletions

diff --git a/src/main/java/com/google/devtools/build/lib/unix/FileStatus.java b/src/main/java/com/google/devtools/build/lib/unix/FileStatus.java
index e227f95cb9..9a63feeb55 100644
--- a/src/main/java/com/google/devtools/build/lib/unix/FileStatus.java
+++ b/src/main/java/com/google/devtools/build/lib/unix/FileStatus.java
@@ -259,4 +259,23 @@ public class FileStatus {
     return (i & 0x7FFFFFFF) - (long) (i & 0x80000000);
   }
 
+  public static boolean isFile(int rawType) {
+    int type = rawType & S_IFMT;
+    return type == S_IFREG || isSpecialFile(rawType);
+  }
+
+  public static boolean isSpecialFile(int rawType) {
+    int type = rawType & S_IFMT;
+    return type == S_IFSOCK || type == S_IFBLK || type == S_IFCHR || type == S_IFIFO;
+  }
+
+  public static boolean isDirectory(int rawType) {
+    int type = rawType & S_IFMT;
+    return type == S_IFDIR;
+  }
+
+  public static boolean isSymbolicLink(int rawType) {
+    int type = rawType & S_IFMT;
+    return type == S_IFLNK;
+  }
 }
diff --git a/src/main/java/com/google/devtools/build/lib/unix/FilesystemUtils.java b/src/main/java/com/google/devtools/build/lib/unix/FilesystemUtils.java
index 525942f44e..0cab41ca4f 100644
--- a/src/main/java/com/google/devtools/build/lib/unix/FilesystemUtils.java
+++ b/src/main/java/com/google/devtools/build/lib/unix/FilesystemUtils.java
@@ -14,6 +14,7 @@
 
 package com.google.devtools.build.lib.unix;
 
+import com.google.common.annotations.VisibleForTesting;
 import com.google.common.hash.HashCode;
 import com.google.devtools.build.lib.UnixJniLoader;
 
@@ -373,6 +374,16 @@ public final class FilesystemUtils {
    */
   public static native boolean remove(String path) throws IOException;
 
+  /**
+   * Native wrapper around POSIX mkfifo(3) C library call.
+   *
+   * @param path the name of the pipe to create.
+   * @param mode the mode with which to create the pipe.
+   * @throws IOException if the mkfifo failed.
+   */
+  @VisibleForTesting
+  public static native void mkfifo(String path, int mode) throws IOException;
+
   /********************************************************************
    *                                                                  *
    *                  Linux extended file attributes                  *