> The `ProcessBuilder.pipelineStart()` implementation does not close all of the > file descriptors it uses to create the pipeline of processes. > > The process calling `pipelineStart()` is creating the pipes between the > stages. > As each process is launched, the file descriptor is inherited by the child > process and > the child process `dup`s them to the respective stdin/stdout/stderr fd. > These copies of inherited file descriptors are handled correctly. > > Between the launching of each Process, the file descriptor for the read-side > of the pipe for the output of the previous process is kept open (in the > parent process invoking `pipelineStart`). The file descriptor is correctly > passed to the child and is dup'd to the stdin of the next process. > > However, the open file descriptor in the parent is not closed after it has > been used as the input for the next Process. > The fix is to close the fd after it has been used as the input of the next > process. > > A new test verifies that after `pipelineStart` is complete, the same file > descriptors are open for Unix Pipes as before the test. > The test only runs on Linux using the /proc/<pid>/fd filesystem to identify > open file descriptors. > > The bug fix is in `ProcessBuilder.pipelineStart` and is applicable to all > platforms.
Roger Riggs has updated the pull request incrementally with one additional commit since the last revision: Add TWR for Files.walk of /proc ------------- Changes: - all: https://git.openjdk.org/jdk/pull/9414/files - new: https://git.openjdk.org/jdk/pull/9414/files/0d628d66..845695d8 Webrevs: - full: https://webrevs.openjdk.org/?repo=jdk&pr=9414&range=02 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=9414&range=01-02 Stats: 13 lines in 1 file changed: 1 ins; 0 del; 12 mod Patch: https://git.openjdk.org/jdk/pull/9414.diff Fetch: git fetch https://git.openjdk.org/jdk pull/9414/head:pull/9414 PR: https://git.openjdk.org/jdk/pull/9414
