8187443: Forest Consolidation: Move files to unified layout

Reviewed-by: darcy, ihse

src/java.base/linux/native/libjava/ProcessHandleImpl_linux.c

@@ -0,0 +1,271 @@
+/*
+ * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+#include "jni.h"
+#include "jni_util.h"
+#include "java_lang_ProcessHandleImpl.h"
+#include "java_lang_ProcessHandleImpl_Info.h"
+
+#include "ProcessHandleImpl_unix.h"
+
+
+#include <fcntl.h>
+#include <limits.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+
+#include <string.h>
+#include <ctype.h>
+
+/*
+ * Implementation of native ProcessHandleImpl functions for Linux.
+ * See ProcessHandleImpl_unix.c for more details.
+ */
+
+/* Signatures for internal OS specific functions. */
+static long long getBoottime(JNIEnv *env);
+
+/* A static offset in milliseconds since boot. */
+static long long bootTime_ms;
+static long clock_ticks_per_second;
+static int pageSize;
+
+void os_initNative(JNIEnv *env, jclass clazz) {
+    bootTime_ms = getBoottime(env);
+    clock_ticks_per_second = sysconf(_SC_CLK_TCK);
+    pageSize = sysconf(_SC_PAGESIZE);
+}
+
+jint os_getChildren(JNIEnv *env, jlong jpid, jlongArray jarray,
+                    jlongArray jparentArray, jlongArray jstimesArray) {
+    return unix_getChildren(env, jpid, jarray, jparentArray, jstimesArray);
+}
+
+/**
+ * Read /proc/<pid>/stat and return the ppid, total cputime and start time.
+ * -1 is fail;  >=  0 is parent pid
+ * 'total' will contain the running time of 'pid' in nanoseconds.
+ * 'start' will contain the start time of 'pid' in milliseconds since epoch.
+ */
+pid_t os_getParentPidAndTimings(JNIEnv *env, pid_t pid,
+                                jlong *totalTime, jlong* startTime) {
+    FILE* fp;
+    char buffer[2048];
+    int statlen;
+    char fn[32];
+    char* s;
+    int parentPid;
+    long unsigned int utime = 0;      // clock tics
+    long unsigned int stime = 0;      // clock tics
+    long long unsigned int start = 0; // microseconds
+
+    /*
+     * Try to stat and then open /proc/%d/stat
+     */
+    snprintf(fn, sizeof fn, "/proc/%d/stat", pid);
+
+    fp = fopen(fn, "r");
+    if (fp == NULL) {
+        return -1;              // fail, no such /proc/pid/stat
+    }
+
+    /*
+     * The format is: pid (command) state ppid ...
+     * As the command could be anything we must find the right most
+     * ")" and then skip the white spaces that follow it.
+     */
+    statlen = fread(buffer, 1, (sizeof buffer - 1), fp);
+    fclose(fp);
+    if (statlen < 0) {
+        return -1;               // parent pid is not available
+    }
+
+    buffer[statlen] = '\0';
+    s = strchr(buffer, '(');
+    if (s == NULL) {
+        return -1;               // parent pid is not available
+    }
+    // Found start of command, skip to end
+    s++;
+    s = strrchr(s, ')');
+    if (s == NULL) {
+        return -1;               // parent pid is not available
+    }
+    s++;
+
+    // Scan the needed fields from status, retaining only ppid(4),
+    // utime (14), stime(15), starttime(22)
+    if (4 != sscanf(s, " %*c %d %*d %*d %*d %*d %*d %*u %*u %*u %*u %lu %lu %*d %*d %*d %*d %*d %*d %llu",
+            &parentPid, &utime, &stime, &start)) {
+        return 0;              // not all values parsed; return error
+    }
+
+    *totalTime = (utime + stime) * (jlong)(1000000000 / clock_ticks_per_second);
+
+    *startTime = bootTime_ms + ((start * 1000) / clock_ticks_per_second);
+
+    return parentPid;
+}
+
+void os_getCmdlineAndUserInfo(JNIEnv *env, jobject jinfo, pid_t pid) {
+    int fd;
+    int cmdlen = 0;
+    char *cmdline = NULL, *cmdEnd = NULL; // used for command line args and exe
+    char *args = NULL;
+    jstring cmdexe = NULL;
+    char fn[32];
+    struct stat stat_buf;
+
+    /*
+     * Stat /proc/<pid> to get the user id
+     */
+    snprintf(fn, sizeof fn, "/proc/%d", pid);
+    if (stat(fn, &stat_buf) == 0) {
+        unix_getUserInfo(env, jinfo, stat_buf.st_uid);
+        JNU_CHECK_EXCEPTION(env);
+    }
+
+    /*
+     * Try to open /proc/<pid>/cmdline
+     */
+    strncat(fn, "/cmdline", sizeof fn - strnlen(fn, sizeof fn) - 1);
+    if ((fd = open(fn, O_RDONLY)) < 0) {
+        return;
+    }
+
+    do {                // Block to break out of on errors
+        int i, truncated = 0;
+        int count;
+        char *s;
+
+        /*
+         * The path name read by readlink() is limited to PATH_MAX characters.
+         * The content of /proc/<pid>/cmdline is limited to PAGE_SIZE characters.
+         */
+        cmdline = (char*)malloc((PATH_MAX > pageSize ? PATH_MAX : pageSize) + 1);
+        if (cmdline == NULL) {
+            break;
+        }
+
+        /*
+         * On Linux, the full path to the executable command is the link in
+         * /proc/<pid>/exe. But it is only readable for processes we own.
+         */
+        snprintf(fn, sizeof fn, "/proc/%d/exe", pid);
+        if ((cmdlen = readlink(fn, cmdline, PATH_MAX)) > 0) {
+            // null terminate and create String to store for command
+            cmdline[cmdlen] = '\0';
+            cmdexe = JNU_NewStringPlatform(env, cmdline);
+            (*env)->ExceptionClear(env);        // unconditionally clear any exception
+        }
+
+        /*
+         * The command-line arguments appear as a set of strings separated by
+         * null bytes ('\0'), with a further null byte after the last
+         * string. The last string is only null terminated if the whole command
+         * line is not exceeding (PAGE_SIZE - 1) characters.
+         */
+        cmdlen = 0;
+        s = cmdline;
+        while ((count = read(fd, s, pageSize - cmdlen)) > 0) {
+            cmdlen += count;
+            s += count;
+        }
+        if (count < 0) {
+            break;
+        }
+        // We have to null-terminate because the process may have changed argv[]
+        // or because the content in /proc/<pid>/cmdline is truncated.
+        cmdline[cmdlen] = '\0';
+        if (cmdlen == pageSize && cmdline[pageSize - 1] != '\0') {
+            truncated = 1;
+        } else if (cmdlen == 0) {
+            // /proc/<pid>/cmdline was empty. This usually happens for kernel processes
+            // like '[kthreadd]'. We could try to read /proc/<pid>/comm in the future.
+        }
+        if (cmdlen > 0 && (cmdexe == NULL || truncated)) {
+            // We have no exact command or the arguments are truncated.
+            // In this case we save the command line from /proc/<pid>/cmdline.
+            args = (char*)malloc(pageSize + 1);
+            if (args != NULL) {
+                memcpy(args, cmdline, cmdlen + 1);
+                for (i = 0; i < cmdlen; i++) {
+                    if (args[i] == '\0') {
+                        args[i] = ' ';
+                    }
+                }
+            }
+        }
+        i = 0;
+        if (!truncated) {
+            // Count the arguments
+            cmdEnd = &cmdline[cmdlen];
+            for (s = cmdline; *s != '\0' && (s < cmdEnd); i++) {
+                s += strnlen(s, (cmdEnd - s)) + 1;
+            }
+        }
+        unix_fillArgArray(env, jinfo, i, cmdline, cmdEnd, cmdexe, args);
+    } while (0);
+
+    if (cmdline != NULL) {
+        free(cmdline);
+    }
+    if (args != NULL) {
+        free(args);
+    }
+    if (fd >= 0) {
+        close(fd);
+    }
+}
+
+/**
+ * Read the boottime from /proc/stat.
+ */
+static long long getBoottime(JNIEnv *env) {
+    FILE *fp;
+    char *line = NULL;
+    size_t len = 0;
+    long long bootTime = 0;
+
+    fp = fopen("/proc/stat", "r");
+    if (fp == NULL) {
+        return -1;
+    }
+
+    while (getline(&line, &len, fp) != -1) {
+        if (sscanf(line, "btime %llu", &bootTime) == 1) {
+            break;
+        }
+    }
+    free(line);
+
+    if (fp != 0) {
+        fclose(fp);
+    }
+
+    return bootTime * 1000;
+}

src/java.base/linux/native/libjsig/jsig.c

@@ -0,0 +1,230 @@
+/*
+ * Copyright (c) 2001, 2013, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+
+/* CopyrightVersion 1.2 */
+
+/* This is a special library that should be loaded before libc &
+ * libthread to interpose the signal handler installation functions:
+ * sigaction(), signal(), sigset().
+ * Used for signal-chaining. See RFE 4381843.
+ */
+
+#include <signal.h>
+#include <dlfcn.h>
+#include <pthread.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+
+#define bool int
+#define true 1
+#define false 0
+
+#define MASK(sig) ((uint64_t)1 << (sig-1))  // 0 is not a signal.
+// Check whether all signals fit into jvmsigs. -1 as MASK shifts by -1.
+#if (64 < NSIG-1)
+#error "Not all signals can be encoded in jvmsigs. Adapt its type!"
+#endif
+static struct sigaction sact[NSIG]; /* saved signal handlers */
+static uint64_t jvmsigs = 0; /* signals used by jvm */
+
+/* used to synchronize the installation of signal handlers */
+static pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
+static pthread_cond_t cond = PTHREAD_COND_INITIALIZER;
+static pthread_t tid = 0;
+
+typedef void (*sa_handler_t)(int);
+typedef void (*sa_sigaction_t)(int, siginfo_t *, void *);
+typedef sa_handler_t (*signal_t)(int, sa_handler_t);
+typedef int (*sigaction_t)(int, const struct sigaction *, struct sigaction *);
+
+static signal_t os_signal = 0; /* os's version of signal()/sigset() */
+static sigaction_t os_sigaction = 0; /* os's version of sigaction() */
+
+static bool jvm_signal_installing = false;
+static bool jvm_signal_installed = false;
+
+static void signal_lock() {
+  pthread_mutex_lock(&mutex);
+  /* When the jvm is installing its set of signal handlers, threads
+   * other than the jvm thread should wait */
+  if (jvm_signal_installing) {
+    if (tid != pthread_self()) {
+      pthread_cond_wait(&cond, &mutex);
+    }
+  }
+}
+
+static void signal_unlock() {
+  pthread_mutex_unlock(&mutex);
+}
+
+static sa_handler_t call_os_signal(int sig, sa_handler_t disp,
+                                   bool is_sigset) {
+  if (os_signal == NULL) {
+    if (!is_sigset) {
+      os_signal = (signal_t)dlsym(RTLD_NEXT, "signal");
+    } else {
+      os_signal = (signal_t)dlsym(RTLD_NEXT, "sigset");
+    }
+    if (os_signal == NULL) {
+      printf("%s\n", dlerror());
+      exit(0);
+    }
+  }
+  return (*os_signal)(sig, disp);
+}
+
+static void save_signal_handler(int sig, sa_handler_t disp) {
+  sigset_t set;
+  sact[sig].sa_handler = disp;
+  sigemptyset(&set);
+  sact[sig].sa_mask = set;
+  sact[sig].sa_flags = 0;
+}
+
+static sa_handler_t set_signal(int sig, sa_handler_t disp, bool is_sigset) {
+  sa_handler_t oldhandler;
+  bool sigused;
+
+  signal_lock();
+
+  sigused = (sig < NSIG) && ((MASK(sig) & jvmsigs) != 0);
+  if (jvm_signal_installed && sigused) {
+    /* jvm has installed its signal handler for this signal. */
+    /* Save the handler. Don't really install it. */
+    oldhandler = sact[sig].sa_handler;
+    save_signal_handler(sig, disp);
+
+    signal_unlock();
+    return oldhandler;
+  } else if (sig < NSIG && jvm_signal_installing) {
+    /* jvm is installing its signal handlers. Install the new
+     * handlers and save the old ones. jvm uses sigaction().
+     * Leave the piece here just in case. */
+    oldhandler = call_os_signal(sig, disp, is_sigset);
+    save_signal_handler(sig, oldhandler);
+
+    /* Record the signals used by jvm */
+    jvmsigs |= MASK(sig);
+
+    signal_unlock();
+    return oldhandler;
+  } else {
+    /* jvm has no relation with this signal (yet). Install the
+     * the handler. */
+    oldhandler = call_os_signal(sig, disp, is_sigset);
+
+    signal_unlock();
+    return oldhandler;
+  }
+}
+
+sa_handler_t signal(int sig, sa_handler_t disp) {
+  return set_signal(sig, disp, false);
+}
+
+sa_handler_t sigset(int sig, sa_handler_t disp) {
+  return set_signal(sig, disp, true);
+ }
+
+static int call_os_sigaction(int sig, const struct sigaction  *act,
+                             struct sigaction *oact) {
+  if (os_sigaction == NULL) {
+    os_sigaction = (sigaction_t)dlsym(RTLD_NEXT, "sigaction");
+    if (os_sigaction == NULL) {
+      printf("%s\n", dlerror());
+      exit(0);
+    }
+  }
+  return (*os_sigaction)(sig, act, oact);
+}
+
+int sigaction(int sig, const struct sigaction *act, struct sigaction *oact) {
+  int res;
+  bool sigused;
+  struct sigaction oldAct;
+
+  signal_lock();
+
+  sigused = (sig < NSIG) && ((MASK(sig) & jvmsigs) != 0);
+  if (jvm_signal_installed && sigused) {
+    /* jvm has installed its signal handler for this signal. */
+    /* Save the handler. Don't really install it. */
+    if (oact != NULL) {
+      *oact = sact[sig];
+    }
+    if (act != NULL) {
+      sact[sig] = *act;
+    }
+
+    signal_unlock();
+    return 0;
+  } else if (sig < NSIG && jvm_signal_installing) {
+    /* jvm is installing its signal handlers. Install the new
+     * handlers and save the old ones. */
+    res = call_os_sigaction(sig, act, &oldAct);
+    sact[sig] = oldAct;
+    if (oact != NULL) {
+      *oact = oldAct;
+    }
+
+    /* Record the signals used by jvm */
+    jvmsigs |= MASK(sig);
+
+    signal_unlock();
+    return res;
+  } else {
+    /* jvm has no relation with this signal (yet). Install the
+     * the handler. */
+    res = call_os_sigaction(sig, act, oact);
+
+    signal_unlock();
+    return res;
+  }
+}
+
+/* The three functions for the jvm to call into */
+void JVM_begin_signal_setting() {
+  signal_lock();
+  jvm_signal_installing = true;
+  tid = pthread_self();
+  signal_unlock();
+}
+
+void JVM_end_signal_setting() {
+  signal_lock();
+  jvm_signal_installed = true;
+  jvm_signal_installing = false;
+  pthread_cond_broadcast(&cond);
+  signal_unlock();
+}
+
+struct sigaction *JVM_get_signal_action(int sig) {
+  /* Does race condition make sense here? */
+  if ((MASK(sig) & jvmsigs) != 0) {
+    return &sact[sig];
+  }
+  return NULL;
+}

src/java.base/linux/native/libnet/linux_close.c

@@ -0,0 +1,458 @@
+/*
+ * Copyright (c) 2001, 2017, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+#include <assert.h>
+#include <limits.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <signal.h>
+#include <pthread.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/time.h>
+#include <sys/resource.h>
+#include <sys/uio.h>
+#include <unistd.h>
+#include <errno.h>
+#include <poll.h>
+#include "jvm.h"
+#include "net_util.h"
+
+/*
+ * Stack allocated by thread when doing blocking operation
+ */
+typedef struct threadEntry {
+    pthread_t thr;                      /* this thread */
+    struct threadEntry *next;           /* next thread */
+    int intr;                           /* interrupted */
+} threadEntry_t;
+
+/*
+ * Heap allocated during initialized - one entry per fd
+ */
+typedef struct {
+    pthread_mutex_t lock;               /* fd lock */
+    threadEntry_t *threads;             /* threads blocked on fd */
+} fdEntry_t;
+
+/*
+ * Signal to unblock thread
+ */
+static int sigWakeup = (__SIGRTMAX - 2);
+
+/*
+ * fdTable holds one entry per file descriptor, up to a certain
+ * maximum.
+ * Theoretically, the number of possible file descriptors can get
+ * large, though usually it does not. Entries for small value file
+ * descriptors are kept in a simple table, which covers most scenarios.
+ * Entries for large value file descriptors are kept in an overflow
+ * table, which is organized as a sparse two dimensional array whose
+ * slabs are allocated on demand. This covers all corner cases while
+ * keeping memory consumption reasonable.
+ */
+
+/* Base table for low value file descriptors */
+static fdEntry_t* fdTable = NULL;
+/* Maximum size of base table (in number of entries). */
+static const int fdTableMaxSize = 0x1000; /* 4K */
+/* Actual size of base table (in number of entries) */
+static int fdTableLen = 0;
+/* Max. theoretical number of file descriptors on system. */
+static int fdLimit = 0;
+
+/* Overflow table, should base table not be large enough. Organized as
+ *   an array of n slabs, each holding 64k entries.
+ */
+static fdEntry_t** fdOverflowTable = NULL;
+/* Number of slabs in the overflow table */
+static int fdOverflowTableLen = 0;
+/* Number of entries in one slab */
+static const int fdOverflowTableSlabSize = 0x10000; /* 64k */
+pthread_mutex_t fdOverflowTableLock = PTHREAD_MUTEX_INITIALIZER;
+
+/*
+ * Null signal handler
+ */
+static void sig_wakeup(int sig) {
+}
+
+/*
+ * Initialization routine (executed when library is loaded)
+ * Allocate fd tables and sets up signal handler.
+ */
+static void __attribute((constructor)) init() {
+    struct rlimit nbr_files;
+    sigset_t sigset;
+    struct sigaction sa;
+    int i = 0;
+
+    /* Determine the maximum number of possible file descriptors. */
+    if (-1 == getrlimit(RLIMIT_NOFILE, &nbr_files)) {
+        fprintf(stderr, "library initialization failed - "
+                "unable to get max # of allocated fds\n");
+        abort();
+    }
+    if (nbr_files.rlim_max != RLIM_INFINITY) {
+        fdLimit = nbr_files.rlim_max;
+    } else {
+        /* We just do not know. */
+        fdLimit = INT_MAX;
+    }
+
+    /* Allocate table for low value file descriptors. */
+    fdTableLen = fdLimit < fdTableMaxSize ? fdLimit : fdTableMaxSize;
+    fdTable = (fdEntry_t*) calloc(fdTableLen, sizeof(fdEntry_t));
+    if (fdTable == NULL) {
+        fprintf(stderr, "library initialization failed - "
+                "unable to allocate file descriptor table - out of memory");
+        abort();
+    } else {
+        for (i = 0; i < fdTableLen; i ++) {
+            pthread_mutex_init(&fdTable[i].lock, NULL);
+        }
+    }
+
+    /* Allocate overflow table, if needed */
+    if (fdLimit > fdTableMaxSize) {
+        fdOverflowTableLen = ((fdLimit - fdTableMaxSize) / fdOverflowTableSlabSize) + 1;
+        fdOverflowTable = (fdEntry_t**) calloc(fdOverflowTableLen, sizeof(fdEntry_t*));
+        if (fdOverflowTable == NULL) {
+            fprintf(stderr, "library initialization failed - "
+                    "unable to allocate file descriptor overflow table - out of memory");
+            abort();
+        }
+    }
+
+    /*
+     * Setup the signal handler
+     */
+    sa.sa_handler = sig_wakeup;
+    sa.sa_flags   = 0;
+    sigemptyset(&sa.sa_mask);
+    sigaction(sigWakeup, &sa, NULL);
+
+    sigemptyset(&sigset);
+    sigaddset(&sigset, sigWakeup);
+    sigprocmask(SIG_UNBLOCK, &sigset, NULL);
+}
+
+/*
+ * Return the fd table for this fd.
+ */
+static inline fdEntry_t *getFdEntry(int fd)
+{
+    fdEntry_t* result = NULL;
+
+    if (fd < 0) {
+        return NULL;
+    }
+
+    /* This should not happen. If it does, our assumption about
+     * max. fd value was wrong. */
+    assert(fd < fdLimit);
+
+    if (fd < fdTableMaxSize) {
+        /* fd is in base table. */
+        assert(fd < fdTableLen);
+        result = &fdTable[fd];
+    } else {
+        /* fd is in overflow table. */
+        const int indexInOverflowTable = fd - fdTableMaxSize;
+        const int rootindex = indexInOverflowTable / fdOverflowTableSlabSize;
+        const int slabindex = indexInOverflowTable % fdOverflowTableSlabSize;
+        fdEntry_t* slab = NULL;
+        assert(rootindex < fdOverflowTableLen);
+        assert(slabindex < fdOverflowTableSlabSize);
+        pthread_mutex_lock(&fdOverflowTableLock);
+        /* Allocate new slab in overflow table if needed */
+        if (fdOverflowTable[rootindex] == NULL) {
+            fdEntry_t* const newSlab =
+                (fdEntry_t*)calloc(fdOverflowTableSlabSize, sizeof(fdEntry_t));
+            if (newSlab == NULL) {
+                fprintf(stderr, "Unable to allocate file descriptor overflow"
+                        " table slab - out of memory");
+                pthread_mutex_unlock(&fdOverflowTableLock);
+                abort();
+            } else {
+                int i;
+                for (i = 0; i < fdOverflowTableSlabSize; i ++) {
+                    pthread_mutex_init(&newSlab[i].lock, NULL);
+                }
+                fdOverflowTable[rootindex] = newSlab;
+            }
+        }
+        pthread_mutex_unlock(&fdOverflowTableLock);
+        slab = fdOverflowTable[rootindex];
+        result = &slab[slabindex];
+    }
+
+    return result;
+
+}
+
+/*
+ * Start a blocking operation :-
+ *    Insert thread onto thread list for the fd.
+ */
+static inline void startOp(fdEntry_t *fdEntry, threadEntry_t *self)
+{
+    self->thr = pthread_self();
+    self->intr = 0;
+
+    pthread_mutex_lock(&(fdEntry->lock));
+    {
+        self->next = fdEntry->threads;
+        fdEntry->threads = self;
+    }
+    pthread_mutex_unlock(&(fdEntry->lock));
+}
+
+/*
+ * End a blocking operation :-
+ *     Remove thread from thread list for the fd
+ *     If fd has been interrupted then set errno to EBADF
+ */
+static inline void endOp
+    (fdEntry_t *fdEntry, threadEntry_t *self)
+{
+    int orig_errno = errno;
+    pthread_mutex_lock(&(fdEntry->lock));
+    {
+        threadEntry_t *curr, *prev=NULL;
+        curr = fdEntry->threads;
+        while (curr != NULL) {
+            if (curr == self) {
+                if (curr->intr) {
+                    orig_errno = EBADF;
+                }
+                if (prev == NULL) {
+                    fdEntry->threads = curr->next;
+                } else {
+                    prev->next = curr->next;
+                }
+                break;
+            }
+            prev = curr;
+            curr = curr->next;
+        }
+    }
+    pthread_mutex_unlock(&(fdEntry->lock));
+    errno = orig_errno;
+}
+
+/*
+ * Close or dup2 a file descriptor ensuring that all threads blocked on
+ * the file descriptor are notified via a wakeup signal.
+ *
+ *      fd1 < 0    => close(fd2)
+ *      fd1 >= 0   => dup2(fd1, fd2)
+ *
+ * Returns -1 with errno set if operation fails.
+ */
+static int closefd(int fd1, int fd2) {
+    int rv, orig_errno;
+    fdEntry_t *fdEntry = getFdEntry(fd2);
+    if (fdEntry == NULL) {
+        errno = EBADF;
+        return -1;
+    }
+
+    /*
+     * Lock the fd to hold-off additional I/O on this fd.
+     */
+    pthread_mutex_lock(&(fdEntry->lock));
+
+    {
+        /*
+         * And close/dup the file descriptor
+         * (restart if interrupted by signal)
+         */
+        do {
+            if (fd1 < 0) {
+                rv = close(fd2);
+            } else {
+                rv = dup2(fd1, fd2);
+            }
+        } while (rv == -1 && errno == EINTR);
+
+        /*
+         * Send a wakeup signal to all threads blocked on this
+         * file descriptor.
+         */
+        threadEntry_t *curr = fdEntry->threads;
+        while (curr != NULL) {
+            curr->intr = 1;
+            pthread_kill( curr->thr, sigWakeup );
+            curr = curr->next;
+        }
+    }
+
+    /*
+     * Unlock without destroying errno
+     */
+    orig_errno = errno;
+    pthread_mutex_unlock(&(fdEntry->lock));
+    errno = orig_errno;
+
+    return rv;
+}
+
+/*
+ * Wrapper for dup2 - same semantics as dup2 system call except
+ * that any threads blocked in an I/O system call on fd2 will be
+ * preempted and return -1/EBADF;
+ */
+int NET_Dup2(int fd, int fd2) {
+    if (fd < 0) {
+        errno = EBADF;
+        return -1;
+    }
+    return closefd(fd, fd2);
+}
+
+/*
+ * Wrapper for close - same semantics as close system call
+ * except that any threads blocked in an I/O on fd will be
+ * preempted and the I/O system call will return -1/EBADF.
+ */
+int NET_SocketClose(int fd) {
+    return closefd(-1, fd);
+}
+
+/************** Basic I/O operations here ***************/
+
+/*
+ * Macro to perform a blocking IO operation. Restarts
+ * automatically if interrupted by signal (other than
+ * our wakeup signal)
+ */
+#define BLOCKING_IO_RETURN_INT(FD, FUNC) {      \
+    int ret;                                    \
+    threadEntry_t self;                         \
+    fdEntry_t *fdEntry = getFdEntry(FD);        \
+    if (fdEntry == NULL) {                      \
+        errno = EBADF;                          \
+        return -1;                              \
+    }                                           \
+    do {                                        \
+        startOp(fdEntry, &self);                \
+        ret = FUNC;                             \
+        endOp(fdEntry, &self);                  \
+    } while (ret == -1 && errno == EINTR);      \
+    return ret;                                 \
+}
+
+int NET_Read(int s, void* buf, size_t len) {
+    BLOCKING_IO_RETURN_INT( s, recv(s, buf, len, 0) );
+}
+
+int NET_NonBlockingRead(int s, void* buf, size_t len) {
+    BLOCKING_IO_RETURN_INT( s, recv(s, buf, len, MSG_DONTWAIT) );
+}
+
+int NET_ReadV(int s, const struct iovec * vector, int count) {
+    BLOCKING_IO_RETURN_INT( s, readv(s, vector, count) );
+}
+
+int NET_RecvFrom(int s, void *buf, int len, unsigned int flags,
+       struct sockaddr *from, socklen_t *fromlen) {
+    BLOCKING_IO_RETURN_INT( s, recvfrom(s, buf, len, flags, from, fromlen) );
+}
+
+int NET_Send(int s, void *msg, int len, unsigned int flags) {
+    BLOCKING_IO_RETURN_INT( s, send(s, msg, len, flags) );
+}
+
+int NET_WriteV(int s, const struct iovec * vector, int count) {
+    BLOCKING_IO_RETURN_INT( s, writev(s, vector, count) );
+}
+
+int NET_SendTo(int s, const void *msg, int len,  unsigned  int
+       flags, const struct sockaddr *to, int tolen) {
+    BLOCKING_IO_RETURN_INT( s, sendto(s, msg, len, flags, to, tolen) );
+}
+
+int NET_Accept(int s, struct sockaddr *addr, socklen_t *addrlen) {
+    BLOCKING_IO_RETURN_INT( s, accept(s, addr, addrlen) );
+}
+
+int NET_Connect(int s, struct sockaddr *addr, int addrlen) {
+    BLOCKING_IO_RETURN_INT( s, connect(s, addr, addrlen) );
+}
+
+int NET_Poll(struct pollfd *ufds, unsigned int nfds, int timeout) {
+    BLOCKING_IO_RETURN_INT( ufds[0].fd, poll(ufds, nfds, timeout) );
+}
+
+/*
+ * Wrapper for poll(s, timeout).
+ * Auto restarts with adjusted timeout if interrupted by
+ * signal other than our wakeup signal.
+ */
+int NET_Timeout(JNIEnv *env, int s, long timeout, jlong nanoTimeStamp) {
+    jlong prevNanoTime = nanoTimeStamp;
+    jlong nanoTimeout = (jlong)timeout * NET_NSEC_PER_MSEC;
+    fdEntry_t *fdEntry = getFdEntry(s);
+
+    /*
+     * Check that fd hasn't been closed.
+     */
+    if (fdEntry == NULL) {
+        errno = EBADF;
+        return -1;
+    }
+
+    for(;;) {
+        struct pollfd pfd;
+        int rv;
+        threadEntry_t self;
+
+        /*
+         * Poll the fd. If interrupted by our wakeup signal
+         * errno will be set to EBADF.
+         */
+        pfd.fd = s;
+        pfd.events = POLLIN | POLLERR;
+
+        startOp(fdEntry, &self);
+        rv = poll(&pfd, 1, nanoTimeout / NET_NSEC_PER_MSEC);
+        endOp(fdEntry, &self);
+        /*
+         * If interrupted then adjust timeout. If timeout
+         * has expired return 0 (indicating timeout expired).
+         */
+        if (rv < 0 && errno == EINTR) {
+            jlong newNanoTime = JVM_NanoTime(env, 0);
+            nanoTimeout -= newNanoTime - prevNanoTime;
+            if (nanoTimeout < NET_NSEC_PER_MSEC) {
+                return 0;
+            }
+            prevNanoTime = newNanoTime;
+        } else {
+            return rv;
+        }
+    }
+}

src/java.base/linux/native/libnio/ch/EPoll.c

@@ -0,0 +1,97 @@
+/*
+ * Copyright (c) 2008, 2011, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+#include "jni.h"
+#include "jni_util.h"
+#include "jvm.h"
+#include "jlong.h"
+#include "nio_util.h"
+
+#include "sun_nio_ch_EPoll.h"
+
+#include <dlfcn.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/epoll.h>
+
+JNIEXPORT jint JNICALL
+Java_sun_nio_ch_EPoll_eventSize(JNIEnv* env, jclass this)
+{
+    return sizeof(struct epoll_event);
+}
+
+JNIEXPORT jint JNICALL
+Java_sun_nio_ch_EPoll_eventsOffset(JNIEnv* env, jclass this)
+{
+    return offsetof(struct epoll_event, events);
+}
+
+JNIEXPORT jint JNICALL
+Java_sun_nio_ch_EPoll_dataOffset(JNIEnv* env, jclass this)
+{
+    return offsetof(struct epoll_event, data);
+}
+
+JNIEXPORT jint JNICALL
+Java_sun_nio_ch_EPoll_epollCreate(JNIEnv *env, jclass c) {
+    /*
+     * epoll_create expects a size as a hint to the kernel about how to
+     * dimension internal structures. We can't predict the size in advance.
+     */
+    int epfd = epoll_create(256);
+    if (epfd < 0) {
+       JNU_ThrowIOExceptionWithLastError(env, "epoll_create failed");
+    }
+    return epfd;
+}
+
+JNIEXPORT jint JNICALL
+Java_sun_nio_ch_EPoll_epollCtl(JNIEnv *env, jclass c, jint epfd,
+                                   jint opcode, jint fd, jint events)
+{
+    struct epoll_event event;
+    int res;
+
+    event.events = events;
+    event.data.fd = fd;
+
+    RESTARTABLE(epoll_ctl(epfd, (int)opcode, (int)fd, &event), res);
+
+    return (res == 0) ? 0 : errno;
+}
+
+JNIEXPORT jint JNICALL
+Java_sun_nio_ch_EPoll_epollWait(JNIEnv *env, jclass c,
+                                    jint epfd, jlong address, jint numfds)
+{
+    struct epoll_event *events = jlong_to_ptr(address);
+    int res;
+
+    RESTARTABLE(epoll_wait(epfd, events, numfds, -1), res);
+    if (res < 0) {
+        JNU_ThrowIOExceptionWithLastError(env, "epoll_wait failed");
+    }
+    return res;
+}

src/java.base/linux/native/libnio/ch/EPollArrayWrapper.c

@@ -0,0 +1,160 @@
+/*
+ * Copyright (c) 2005, 2016, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+#include "jni.h"
+#include "jni_util.h"
+#include "jvm.h"
+#include "jlong.h"
+
+#include "sun_nio_ch_EPollArrayWrapper.h"
+
+#include <unistd.h>
+#include <sys/time.h>
+#include <sys/epoll.h>
+
+#define RESTARTABLE(_cmd, _result) do { \
+  do { \
+    _result = _cmd; \
+  } while((_result == -1) && (errno == EINTR)); \
+} while(0)
+
+
+static int
+iepoll(int epfd, struct epoll_event *events, int numfds, jlong timeout)
+{
+    jlong start, now;
+    int remaining = timeout;
+    struct timeval t;
+    int diff;
+
+    gettimeofday(&t, NULL);
+    start = t.tv_sec * 1000 + t.tv_usec / 1000;
+
+    for (;;) {
+        int res = epoll_wait(epfd, events, numfds, remaining);
+        if (res < 0 && errno == EINTR) {
+            if (remaining >= 0) {
+                gettimeofday(&t, NULL);
+                now = t.tv_sec * 1000 + t.tv_usec / 1000;
+                diff = now - start;
+                remaining -= diff;
+                if (diff < 0 || remaining <= 0) {
+                    return 0;
+                }
+                start = now;
+            }
+        } else {
+            return res;
+        }
+    }
+}
+
+JNIEXPORT void JNICALL
+Java_sun_nio_ch_EPollArrayWrapper_init(JNIEnv *env, jclass this)
+{
+}
+
+JNIEXPORT jint JNICALL
+Java_sun_nio_ch_EPollArrayWrapper_epollCreate(JNIEnv *env, jobject this)
+{
+    /*
+     * epoll_create expects a size as a hint to the kernel about how to
+     * dimension internal structures. We can't predict the size in advance.
+     */
+    int epfd = epoll_create(256);
+    if (epfd < 0) {
+       JNU_ThrowIOExceptionWithLastError(env, "epoll_create failed");
+    }
+    return epfd;
+}
+
+JNIEXPORT jint JNICALL
+Java_sun_nio_ch_EPollArrayWrapper_sizeofEPollEvent(JNIEnv* env, jclass this)
+{
+    return sizeof(struct epoll_event);
+}
+
+JNIEXPORT jint JNICALL
+Java_sun_nio_ch_EPollArrayWrapper_offsetofData(JNIEnv* env, jclass this)
+{
+    return offsetof(struct epoll_event, data);
+}
+
+JNIEXPORT void JNICALL
+Java_sun_nio_ch_EPollArrayWrapper_epollCtl(JNIEnv *env, jobject this, jint epfd,
+                                           jint opcode, jint fd, jint events)
+{
+    struct epoll_event event;
+    int res;
+
+    event.events = events;
+    event.data.fd = fd;
+
+    RESTARTABLE(epoll_ctl(epfd, (int)opcode, (int)fd, &event), res);
+
+    /*
+     * A channel may be registered with several Selectors. When each Selector
+     * is polled a EPOLL_CTL_DEL op will be inserted into its pending update
+     * list to remove the file descriptor from epoll. The "last" Selector will
+     * close the file descriptor which automatically unregisters it from each
+     * epoll descriptor. To avoid costly synchronization between Selectors we
+     * allow pending updates to be processed, ignoring errors. The errors are
+     * harmless as the last update for the file descriptor is guaranteed to
+     * be EPOLL_CTL_DEL.
+     */
+    if (res < 0 && errno != EBADF && errno != ENOENT && errno != EPERM) {
+        JNU_ThrowIOExceptionWithLastError(env, "epoll_ctl failed");
+    }
+}
+
+JNIEXPORT jint JNICALL
+Java_sun_nio_ch_EPollArrayWrapper_epollWait(JNIEnv *env, jobject this,
+                                            jlong address, jint numfds,
+                                            jlong timeout, jint epfd)
+{
+    struct epoll_event *events = jlong_to_ptr(address);
+    int res;
+
+    if (timeout <= 0) {           /* Indefinite or no wait */
+        RESTARTABLE(epoll_wait(epfd, events, numfds, timeout), res);
+    } else {                      /* Bounded wait; bounded restarts */
+        res = iepoll(epfd, events, numfds, timeout);
+    }
+
+    if (res < 0) {
+        JNU_ThrowIOExceptionWithLastError(env, "epoll_wait failed");
+    }
+    return res;
+}
+
+JNIEXPORT void JNICALL
+Java_sun_nio_ch_EPollArrayWrapper_interrupt(JNIEnv *env, jobject this, jint fd)
+{
+    int fakebuf[1];
+    fakebuf[0] = 1;
+    if (write(fd, fakebuf, 1) < 0) {
+        JNU_ThrowIOExceptionWithLastError(env,"write to interrupt fd failed");
+    }
+}

src/java.base/linux/native/libnio/ch/EPollPort.c

@@ -0,0 +1,76 @@
+/*
+ * Copyright (c) 2008, 2009, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+#include "jni.h"
+#include "jni_util.h"
+#include "jvm.h"
+#include "jlong.h"
+#include "nio_util.h"
+
+#include "sun_nio_ch_EPollPort.h"
+
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+
+JNIEXPORT void JNICALL
+Java_sun_nio_ch_EPollPort_socketpair(JNIEnv* env, jclass clazz, jintArray sv) {
+    int sp[2];
+    if (socketpair(PF_UNIX, SOCK_STREAM, 0, sp) == -1) {
+        JNU_ThrowIOExceptionWithLastError(env, "socketpair failed");
+    } else {
+        jint res[2];
+        res[0] = (jint)sp[0];
+        res[1] = (jint)sp[1];
+        (*env)->SetIntArrayRegion(env, sv, 0, 2, &res[0]);
+    }
+}
+
+JNIEXPORT void JNICALL
+Java_sun_nio_ch_EPollPort_interrupt(JNIEnv *env, jclass c, jint fd) {
+    int res;
+    int buf[1];
+    buf[0] = 1;
+    RESTARTABLE(write(fd, buf, 1), res);
+    if (res < 0) {
+        JNU_ThrowIOExceptionWithLastError(env, "write failed");
+    }
+}
+
+JNIEXPORT void JNICALL
+Java_sun_nio_ch_EPollPort_drain1(JNIEnv *env, jclass cl, jint fd) {
+    int res;
+    char buf[1];
+    RESTARTABLE(read(fd, buf, 1), res);
+    if (res < 0) {
+        JNU_ThrowIOExceptionWithLastError(env, "drain1 failed");
+    }
+}
+
+JNIEXPORT void JNICALL
+Java_sun_nio_ch_EPollPort_close0(JNIEnv *env, jclass c, jint fd) {
+    int res;
+    RESTARTABLE(close(fd), res);
+}

src/java.base/linux/native/libnio/fs/LinuxNativeDispatcher.c

@@ -0,0 +1,232 @@
+/*
+ * Copyright (c) 2008, 2012, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+#include "jni.h"
+#include "jni_util.h"
+#include "jvm.h"
+#include "jlong.h"
+
+#include <stdio.h>
+#include <string.h>
+#include <dlfcn.h>
+#include <errno.h>
+#include <mntent.h>
+
+#include "sun_nio_fs_LinuxNativeDispatcher.h"
+
+typedef size_t fgetxattr_func(int fd, const char* name, void* value, size_t size);
+typedef int fsetxattr_func(int fd, const char* name, void* value, size_t size, int flags);
+typedef int fremovexattr_func(int fd, const char* name);
+typedef int flistxattr_func(int fd, char* list, size_t size);
+
+fgetxattr_func* my_fgetxattr_func = NULL;
+fsetxattr_func* my_fsetxattr_func = NULL;
+fremovexattr_func* my_fremovexattr_func = NULL;
+flistxattr_func* my_flistxattr_func = NULL;
+
+static jfieldID entry_name;
+static jfieldID entry_dir;
+static jfieldID entry_fstype;
+static jfieldID entry_options;
+
+static void throwUnixException(JNIEnv* env, int errnum) {
+    jobject x = JNU_NewObjectByName(env, "sun/nio/fs/UnixException",
+        "(I)V", errnum);
+    if (x != NULL) {
+        (*env)->Throw(env, x);
+    }
+}
+
+JNIEXPORT void JNICALL
+Java_sun_nio_fs_LinuxNativeDispatcher_init(JNIEnv *env, jclass clazz)
+{
+    my_fgetxattr_func = (fgetxattr_func*)dlsym(RTLD_DEFAULT, "fgetxattr");
+    my_fsetxattr_func = (fsetxattr_func*)dlsym(RTLD_DEFAULT, "fsetxattr");
+    my_fremovexattr_func = (fremovexattr_func*)dlsym(RTLD_DEFAULT, "fremovexattr");
+    my_flistxattr_func = (flistxattr_func*)dlsym(RTLD_DEFAULT, "flistxattr");
+
+    clazz = (*env)->FindClass(env, "sun/nio/fs/UnixMountEntry");
+    CHECK_NULL(clazz);
+    entry_name = (*env)->GetFieldID(env, clazz, "name", "[B");
+    CHECK_NULL(entry_name);
+    entry_dir = (*env)->GetFieldID(env, clazz, "dir", "[B");
+    CHECK_NULL(entry_dir);
+    entry_fstype = (*env)->GetFieldID(env, clazz, "fstype", "[B");
+    CHECK_NULL(entry_fstype);
+    entry_options = (*env)->GetFieldID(env, clazz, "opts", "[B");
+    CHECK_NULL(entry_options);
+}
+
+JNIEXPORT jint JNICALL
+Java_sun_nio_fs_LinuxNativeDispatcher_fgetxattr0(JNIEnv* env, jclass clazz,
+    jint fd, jlong nameAddress, jlong valueAddress, jint valueLen)
+{
+    size_t res = -1;
+    const char* name = jlong_to_ptr(nameAddress);
+    void* value = jlong_to_ptr(valueAddress);
+
+    if (my_fgetxattr_func == NULL) {
+        errno = ENOTSUP;
+    } else {
+        /* EINTR not documented */
+        res = (*my_fgetxattr_func)(fd, name, value, valueLen);
+    }
+    if (res == (size_t)-1)
+        throwUnixException(env, errno);
+    return (jint)res;
+}
+
+JNIEXPORT void JNICALL
+Java_sun_nio_fs_LinuxNativeDispatcher_fsetxattr0(JNIEnv* env, jclass clazz,
+    jint fd, jlong nameAddress, jlong valueAddress, jint valueLen)
+{
+    int res = -1;
+    const char* name = jlong_to_ptr(nameAddress);
+    void* value = jlong_to_ptr(valueAddress);
+
+    if (my_fsetxattr_func == NULL) {
+        errno = ENOTSUP;
+    } else {
+        /* EINTR not documented */
+        res = (*my_fsetxattr_func)(fd, name, value, valueLen, 0);
+    }
+    if (res == -1)
+        throwUnixException(env, errno);
+}
+
+JNIEXPORT void JNICALL
+Java_sun_nio_fs_LinuxNativeDispatcher_fremovexattr0(JNIEnv* env, jclass clazz,
+    jint fd, jlong nameAddress)
+{
+    int res = -1;
+    const char* name = jlong_to_ptr(nameAddress);
+
+    if (my_fremovexattr_func == NULL) {
+        errno = ENOTSUP;
+    } else {
+        /* EINTR not documented */
+        res = (*my_fremovexattr_func)(fd, name);
+    }
+    if (res == -1)
+        throwUnixException(env, errno);
+}
+
+JNIEXPORT jint JNICALL
+Java_sun_nio_fs_LinuxNativeDispatcher_flistxattr(JNIEnv* env, jclass clazz,
+    jint fd, jlong listAddress, jint size)
+{
+    size_t res = -1;
+    char* list = jlong_to_ptr(listAddress);
+
+    if (my_flistxattr_func == NULL) {
+        errno = ENOTSUP;
+    } else {
+        /* EINTR not documented */
+        res = (*my_flistxattr_func)(fd, list, (size_t)size);
+    }
+    if (res == (size_t)-1)
+        throwUnixException(env, errno);
+    return (jint)res;
+}
+
+JNIEXPORT jlong JNICALL
+Java_sun_nio_fs_LinuxNativeDispatcher_setmntent0(JNIEnv* env, jclass this, jlong pathAddress,
+                                                 jlong modeAddress)
+{
+    FILE* fp = NULL;
+    const char* path = (const char*)jlong_to_ptr(pathAddress);
+    const char* mode = (const char*)jlong_to_ptr(modeAddress);
+
+    do {
+        fp = setmntent(path, mode);
+    } while (fp == NULL && errno == EINTR);
+    if (fp == NULL) {
+        throwUnixException(env, errno);
+    }
+    return ptr_to_jlong(fp);
+}
+
+JNIEXPORT jint JNICALL
+Java_sun_nio_fs_LinuxNativeDispatcher_getmntent(JNIEnv* env, jclass this,
+    jlong value, jobject entry)
+{
+    struct mntent ent;
+    char buf[1024];
+    int buflen = sizeof(buf);
+    struct mntent* m;
+    FILE* fp = jlong_to_ptr(value);
+    jsize len;
+    jbyteArray bytes;
+    char* name;
+    char* dir;
+    char* fstype;
+    char* options;
+
+    m = getmntent_r(fp, &ent, (char*)&buf, buflen);
+    if (m == NULL)
+        return -1;
+    name = m->mnt_fsname;
+    dir = m->mnt_dir;
+    fstype = m->mnt_type;
+    options = m->mnt_opts;
+
+    len = strlen(name);
+    bytes = (*env)->NewByteArray(env, len);
+    if (bytes == NULL)
+        return -1;
+    (*env)->SetByteArrayRegion(env, bytes, 0, len, (jbyte*)name);
+    (*env)->SetObjectField(env, entry, entry_name, bytes);
+
+    len = strlen(dir);
+    bytes = (*env)->NewByteArray(env, len);
+    if (bytes == NULL)
+        return -1;
+    (*env)->SetByteArrayRegion(env, bytes, 0, len, (jbyte*)dir);
+    (*env)->SetObjectField(env, entry, entry_dir, bytes);
+
+    len = strlen(fstype);
+    bytes = (*env)->NewByteArray(env, len);
+    if (bytes == NULL)
+        return -1;
+    (*env)->SetByteArrayRegion(env, bytes, 0, len, (jbyte*)fstype);
+    (*env)->SetObjectField(env, entry, entry_fstype, bytes);
+
+    len = strlen(options);
+    bytes = (*env)->NewByteArray(env, len);
+    if (bytes == NULL)
+        return -1;
+    (*env)->SetByteArrayRegion(env, bytes, 0, len, (jbyte*)options);
+    (*env)->SetObjectField(env, entry, entry_options, bytes);
+
+    return 0;
+}
+
+JNIEXPORT void JNICALL
+Java_sun_nio_fs_LinuxNativeDispatcher_endmntent(JNIEnv* env, jclass this, jlong stream)
+{
+    FILE* fp = jlong_to_ptr(stream);
+    /* FIXME - man page doesn't explain how errors are returned */
+    endmntent(fp);
+}

src/java.base/linux/native/libnio/fs/LinuxWatchService.c

@@ -0,0 +1,153 @@
+/*
+ * Copyright (c) 2008, 2011, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+#include "jni.h"
+#include "jni_util.h"
+#include "jvm.h"
+#include "jlong.h"
+
+#include <stdlib.h>
+#include <dlfcn.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <poll.h>
+#include <sys/inotify.h>
+
+#include "sun_nio_fs_LinuxWatchService.h"
+
+static void throwUnixException(JNIEnv* env, int errnum) {
+    jobject x = JNU_NewObjectByName(env, "sun/nio/fs/UnixException",
+        "(I)V", errnum);
+    if (x != NULL) {
+        (*env)->Throw(env, x);
+    }
+}
+
+JNIEXPORT jint JNICALL
+Java_sun_nio_fs_LinuxWatchService_eventSize(JNIEnv *env, jclass clazz)
+{
+    return (jint)sizeof(struct inotify_event);
+}
+
+JNIEXPORT jintArray JNICALL
+Java_sun_nio_fs_LinuxWatchService_eventOffsets(JNIEnv *env, jclass clazz)
+{
+    jintArray result = (*env)->NewIntArray(env, 5);
+    if (result != NULL) {
+        jint arr[5];
+        arr[0] = (jint)offsetof(struct inotify_event, wd);
+        arr[1] = (jint)offsetof(struct inotify_event, mask);
+        arr[2] = (jint)offsetof(struct inotify_event, cookie);
+        arr[3] = (jint)offsetof(struct inotify_event, len);
+        arr[4] = (jint)offsetof(struct inotify_event, name);
+        (*env)->SetIntArrayRegion(env, result, 0, 5, arr);
+    }
+    return result;
+}
+
+
+JNIEXPORT jint JNICALL
+Java_sun_nio_fs_LinuxWatchService_inotifyInit
+    (JNIEnv* env, jclass clazz)
+{
+    int ifd = inotify_init();
+    if (ifd == -1) {
+        throwUnixException(env, errno);
+    }
+    return (jint)ifd;
+}
+
+JNIEXPORT jint JNICALL
+Java_sun_nio_fs_LinuxWatchService_inotifyAddWatch
+    (JNIEnv* env, jclass clazz, jint fd, jlong address, jint mask)
+{
+    int wfd = -1;
+    const char* path = (const char*)jlong_to_ptr(address);
+
+    wfd = inotify_add_watch((int)fd, path, mask);
+    if (wfd == -1) {
+        throwUnixException(env, errno);
+    }
+    return (jint)wfd;
+}
+
+JNIEXPORT void JNICALL
+Java_sun_nio_fs_LinuxWatchService_inotifyRmWatch
+    (JNIEnv* env, jclass clazz, jint fd, jint wd)
+{
+    int err = inotify_rm_watch((int)fd, (int)wd);
+    if (err == -1)
+        throwUnixException(env, errno);
+}
+
+JNIEXPORT void JNICALL
+Java_sun_nio_fs_LinuxWatchService_configureBlocking
+    (JNIEnv* env, jclass clazz, jint fd, jboolean blocking)
+{
+    int flags = fcntl(fd, F_GETFL);
+
+    if ((blocking == JNI_FALSE) && !(flags & O_NONBLOCK))
+        fcntl(fd, F_SETFL, flags | O_NONBLOCK);
+    else if ((blocking == JNI_TRUE) && (flags & O_NONBLOCK))
+        fcntl(fd, F_SETFL, flags & ~O_NONBLOCK);
+}
+
+JNIEXPORT void JNICALL
+Java_sun_nio_fs_LinuxWatchService_socketpair
+    (JNIEnv* env, jclass clazz, jintArray sv)
+{
+    int sp[2];
+    if (socketpair(PF_UNIX, SOCK_STREAM, 0, sp) == -1) {
+        throwUnixException(env, errno);
+    } else {
+        jint res[2];
+        res[0] = (jint)sp[0];
+        res[1] = (jint)sp[1];
+        (*env)->SetIntArrayRegion(env, sv, 0, 2, &res[0]);
+    }
+}
+
+JNIEXPORT jint JNICALL
+Java_sun_nio_fs_LinuxWatchService_poll
+    (JNIEnv* env, jclass clazz, jint fd1, jint fd2)
+{
+    struct pollfd ufds[2];
+    int n;
+
+    ufds[0].fd = fd1;
+    ufds[0].events = POLLIN;
+    ufds[1].fd = fd2;
+    ufds[1].events = POLLIN;
+
+    n = poll(&ufds[0], 2, -1);
+    if (n == -1) {
+        if (errno == EINTR) {
+            n = 0;
+        } else {
+            throwUnixException(env, errno);
+        }
+     }
+    return (jint)n;
+}