core/src/main/java/hudson/util/ProcessTree.java [1274:1303]:
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                            long addr = b64 ? m.getLong(0) : to64(m.getInt(0));

                            if (addr == 0) // completed the walk
                                break;

                            // now read the null-terminated string
                            envVars.addLine(readLine(fd, addr, "env["+ n +"]"));
                        }
                    } finally  {
                       LIBC.close(fd); 
                    }
                } catch (IOException | LastErrorException e) {
                    // failed to read. this can happen under normal circumstances (most notably permission denied)
                    // so don't report this as an error.
                }
                return envVars;
            }

            private String readLine(int fd, long addr, String prefix) throws IOException {
                if(LOGGER.isLoggable(FINEST))
                    LOGGER.finest("Reading "+prefix+" at "+addr);

                Memory m = new Memory(1);
                byte ch = 1;
                ByteArrayOutputStream buf = new ByteArrayOutputStream();
                int i = 0;
                while(true) {
                    if (i++ > LINE_LENGTH_LIMIT) {
                        LOGGER.finest("could not find end of line, giving up");
                        throw new IOException("could not find end of line, giving up");
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core/src/main/java/hudson/util/ProcessTree.java [1543:1571]:
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                            long addr = b64 ? m.getLong(0) : to64(m.getInt(0));
                            if (addr == 0) // completed the walk
                                break;

                            // now read the null-terminated string
                            envVars.addLine(readLine(fd, addr, "env["+ n +"]"));
                        }
                    } finally {
                        LIBC.close(fd);
                    }
                } catch (IOException | LastErrorException e) {
                    // failed to read. this can happen under normal circumstances (most notably permission denied)
                    // so don't report this as an error.
                }
                return envVars;
            }

            private String readLine(int fd, long addr, String prefix) throws IOException {
                if(LOGGER.isLoggable(FINEST))
                    LOGGER.finest("Reading "+prefix+" at "+addr);

                Memory m = new Memory(1);
                byte ch = 1;
                ByteArrayOutputStream buf = new ByteArrayOutputStream();
                int i = 0;
                while(true) {
                    if (i++ > LINE_LENGTH_LIMIT) {
                        LOGGER.finest("could not find end of line, giving up");
                        throw new IOException("could not find end of line, giving up");
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