1 /*
   2  * Copyright (c) 2008, 2013, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 #include <stdio.h>
  27 #include <stdlib.h>
  28 #include <limits.h>
  29 #include <fcntl.h>
  30 #include <dirent.h>
  31 #include <unistd.h>
  32 #include <pwd.h>
  33 #include <grp.h>
  34 #include <errno.h>
  35 #include <dlfcn.h>
  36 #include <sys/types.h>
  37 #include <sys/stat.h>
  38 #include <sys/statvfs.h>
  39 #include <sys/time.h>
  40 
  41 #ifdef __solaris__
  42 #include <strings.h>
  43 #endif
  44 
  45 #if defined(__linux__) || defined(_AIX)
  46 #include <string.h>
  47 #endif
  48 
  49 #ifdef _ALLBSD_SOURCE
  50 #include <string.h>
  51 
  52 #define stat64 stat
  53 #define statvfs64 statvfs
  54 
  55 #define open64 open
  56 #define fstat64 fstat
  57 #define lstat64 lstat
  58 #define dirent64 dirent
  59 #define readdir64_r readdir_r
  60 #endif
  61 
  62 #include "jni.h"
  63 #include "jni_util.h"
  64 #include "jlong.h"
  65 
  66 #include "sun_nio_fs_UnixNativeDispatcher.h"
  67 
  68 /**
  69  * Size of password or group entry when not available via sysconf
  70  */
  71 #define ENT_BUF_SIZE   1024
  72 
  73 #define RESTARTABLE(_cmd, _result) do { \
  74   do { \
  75     _result = _cmd; \
  76   } while((_result == -1) && (errno == EINTR)); \
  77 } while(0)
  78 
  79 #define RESTARTABLE_RETURN_PTR(_cmd, _result) do { \
  80   do { \
  81     _result = _cmd; \
  82   } while((_result == NULL) && (errno == EINTR)); \
  83 } while(0)
  84 
  85 static jfieldID attrs_st_mode;
  86 static jfieldID attrs_st_ino;
  87 static jfieldID attrs_st_dev;
  88 static jfieldID attrs_st_rdev;
  89 static jfieldID attrs_st_nlink;
  90 static jfieldID attrs_st_uid;
  91 static jfieldID attrs_st_gid;
  92 static jfieldID attrs_st_size;
  93 static jfieldID attrs_st_atime_sec;
  94 static jfieldID attrs_st_atime_nsec;
  95 static jfieldID attrs_st_mtime_sec;
  96 static jfieldID attrs_st_mtime_nsec;
  97 static jfieldID attrs_st_ctime_sec;
  98 static jfieldID attrs_st_ctime_nsec;
  99 
 100 #ifdef _DARWIN_FEATURE_64_BIT_INODE
 101 static jfieldID attrs_st_birthtime_sec;
 102 #endif
 103 
 104 static jfieldID attrs_f_frsize;
 105 static jfieldID attrs_f_blocks;
 106 static jfieldID attrs_f_bfree;
 107 static jfieldID attrs_f_bavail;
 108 
 109 static jfieldID entry_name;
 110 static jfieldID entry_dir;
 111 static jfieldID entry_fstype;
 112 static jfieldID entry_options;
 113 static jfieldID entry_dev;
 114 
 115 /**
 116  * System calls that may not be available at run time.
 117  */
 118 typedef int openat64_func(int, const char *, int, ...);
 119 typedef int fstatat64_func(int, const char *, struct stat64 *, int);
 120 typedef int unlinkat_func(int, const char*, int);
 121 typedef int renameat_func(int, const char*, int, const char*);
 122 typedef int futimesat_func(int, const char *, const struct timeval *);
 123 typedef DIR* fdopendir_func(int);
 124 
 125 static openat64_func* my_openat64_func = NULL;
 126 static fstatat64_func* my_fstatat64_func = NULL;
 127 static unlinkat_func* my_unlinkat_func = NULL;
 128 static renameat_func* my_renameat_func = NULL;
 129 static futimesat_func* my_futimesat_func = NULL;
 130 static fdopendir_func* my_fdopendir_func = NULL;
 131 
 132 /**
 133  * fstatat missing from glibc on Linux. Temporary workaround
 134  * for x86/x64.
 135  */
 136 #if defined(__linux__) && defined(__i386)
 137 #define FSTATAT64_SYSCALL_AVAILABLE
 138 static int fstatat64_wrapper(int dfd, const char *path,
 139                              struct stat64 *statbuf, int flag)
 140 {
 141     #ifndef __NR_fstatat64
 142     #define __NR_fstatat64  300
 143     #endif
 144     return syscall(__NR_fstatat64, dfd, path, statbuf, flag);
 145 }
 146 #endif
 147 
 148 #if defined(__linux__) && defined(__x86_64__)
 149 #define FSTATAT64_SYSCALL_AVAILABLE
 150 static int fstatat64_wrapper(int dfd, const char *path,
 151                              struct stat64 *statbuf, int flag)
 152 {
 153     #ifndef __NR_newfstatat
 154     #define __NR_newfstatat  262
 155     #endif
 156     return syscall(__NR_newfstatat, dfd, path, statbuf, flag);
 157 }
 158 #endif
 159 
 160 /**
 161  * Call this to throw an internal UnixException when a system/library
 162  * call fails
 163  */
 164 static void throwUnixException(JNIEnv* env, int errnum) {
 165     jobject x = JNU_NewObjectByName(env, "sun/nio/fs/UnixException",
 166         "(I)V", errnum);
 167     if (x != NULL) {
 168         (*env)->Throw(env, x);
 169     }
 170 }
 171 
 172 /**
 173  * Initialization
 174  */
 175 JNIEXPORT jint JNICALL
 176 Java_sun_nio_fs_UnixNativeDispatcher_init(JNIEnv* env, jclass this)
 177 {
 178     jint capabilities = 0;
 179     jclass clazz;
 180 
 181     clazz = (*env)->FindClass(env, "sun/nio/fs/UnixFileAttributes");
 182     CHECK_NULL_RETURN(clazz, 0);
 183     attrs_st_mode = (*env)->GetFieldID(env, clazz, "st_mode", "I");
 184     CHECK_NULL_RETURN(attrs_st_mode, 0);
 185     attrs_st_ino = (*env)->GetFieldID(env, clazz, "st_ino", "J");
 186     CHECK_NULL_RETURN(attrs_st_ino, 0);
 187     attrs_st_dev = (*env)->GetFieldID(env, clazz, "st_dev", "J");
 188     CHECK_NULL_RETURN(attrs_st_dev, 0);
 189     attrs_st_rdev = (*env)->GetFieldID(env, clazz, "st_rdev", "J");
 190     CHECK_NULL_RETURN(attrs_st_rdev, 0);
 191     attrs_st_nlink = (*env)->GetFieldID(env, clazz, "st_nlink", "I");
 192     CHECK_NULL_RETURN(attrs_st_nlink, 0);
 193     attrs_st_uid = (*env)->GetFieldID(env, clazz, "st_uid", "I");
 194     CHECK_NULL_RETURN(attrs_st_uid, 0);
 195     attrs_st_gid = (*env)->GetFieldID(env, clazz, "st_gid", "I");
 196     CHECK_NULL_RETURN(attrs_st_gid, 0);
 197     attrs_st_size = (*env)->GetFieldID(env, clazz, "st_size", "J");
 198     CHECK_NULL_RETURN(attrs_st_size, 0);
 199     attrs_st_atime_sec = (*env)->GetFieldID(env, clazz, "st_atime_sec", "J");
 200     CHECK_NULL_RETURN(attrs_st_atime_sec, 0);
 201     attrs_st_atime_nsec = (*env)->GetFieldID(env, clazz, "st_atime_nsec", "J");
 202     CHECK_NULL_RETURN(attrs_st_atime_nsec, 0);
 203     attrs_st_mtime_sec = (*env)->GetFieldID(env, clazz, "st_mtime_sec", "J");
 204     CHECK_NULL_RETURN(attrs_st_mtime_sec, 0);
 205     attrs_st_mtime_nsec = (*env)->GetFieldID(env, clazz, "st_mtime_nsec", "J");
 206     CHECK_NULL_RETURN(attrs_st_mtime_nsec, 0);
 207     attrs_st_ctime_sec = (*env)->GetFieldID(env, clazz, "st_ctime_sec", "J");
 208     CHECK_NULL_RETURN(attrs_st_ctime_sec, 0);
 209     attrs_st_ctime_nsec = (*env)->GetFieldID(env, clazz, "st_ctime_nsec", "J");
 210     CHECK_NULL_RETURN(attrs_st_ctime_nsec, 0);
 211 
 212 #ifdef _DARWIN_FEATURE_64_BIT_INODE
 213     attrs_st_birthtime_sec = (*env)->GetFieldID(env, clazz, "st_birthtime_sec", "J");
 214     CHECK_NULL_RETURN(attrs_st_birthtime_sec, 0);
 215 #endif
 216 
 217     clazz = (*env)->FindClass(env, "sun/nio/fs/UnixFileStoreAttributes");
 218     CHECK_NULL_RETURN(clazz, 0);
 219     attrs_f_frsize = (*env)->GetFieldID(env, clazz, "f_frsize", "J");
 220     CHECK_NULL_RETURN(attrs_f_frsize, 0);
 221     attrs_f_blocks = (*env)->GetFieldID(env, clazz, "f_blocks", "J");
 222     CHECK_NULL_RETURN(attrs_f_blocks, 0);
 223     attrs_f_bfree = (*env)->GetFieldID(env, clazz, "f_bfree", "J");
 224     CHECK_NULL_RETURN(attrs_f_bfree, 0);
 225     attrs_f_bavail = (*env)->GetFieldID(env, clazz, "f_bavail", "J");
 226     CHECK_NULL_RETURN(attrs_f_bavail, 0);
 227 
 228     clazz = (*env)->FindClass(env, "sun/nio/fs/UnixMountEntry");
 229     CHECK_NULL_RETURN(clazz, 0);
 230     entry_name = (*env)->GetFieldID(env, clazz, "name", "[B");
 231     CHECK_NULL_RETURN(entry_name, 0);
 232     entry_dir = (*env)->GetFieldID(env, clazz, "dir", "[B");
 233     CHECK_NULL_RETURN(entry_dir, 0);
 234     entry_fstype = (*env)->GetFieldID(env, clazz, "fstype", "[B");
 235     CHECK_NULL_RETURN(entry_fstype, 0);
 236     entry_options = (*env)->GetFieldID(env, clazz, "opts", "[B");
 237     CHECK_NULL_RETURN(entry_options, 0);
 238     entry_dev = (*env)->GetFieldID(env, clazz, "dev", "J");
 239     CHECK_NULL_RETURN(entry_dev, 0);
 240 
 241     /* system calls that might not be available at run time */
 242 
 243 #if (defined(__solaris__) && defined(_LP64)) || defined(_ALLBSD_SOURCE)
 244     /* Solaris 64-bit does not have openat64/fstatat64 */
 245     my_openat64_func = (openat64_func*)dlsym(RTLD_DEFAULT, "openat");
 246     my_fstatat64_func = (fstatat64_func*)dlsym(RTLD_DEFAULT, "fstatat");
 247 #else
 248     my_openat64_func = (openat64_func*) dlsym(RTLD_DEFAULT, "openat64");
 249     my_fstatat64_func = (fstatat64_func*) dlsym(RTLD_DEFAULT, "fstatat64");
 250 #endif
 251     my_unlinkat_func = (unlinkat_func*) dlsym(RTLD_DEFAULT, "unlinkat");
 252     my_renameat_func = (renameat_func*) dlsym(RTLD_DEFAULT, "renameat");
 253     my_futimesat_func = (futimesat_func*) dlsym(RTLD_DEFAULT, "futimesat");
 254     my_fdopendir_func = (fdopendir_func*) dlsym(RTLD_DEFAULT, "fdopendir");
 255 
 256 #if defined(FSTATAT64_SYSCALL_AVAILABLE)
 257     /* fstatat64 missing from glibc */
 258     if (my_fstatat64_func == NULL)
 259         my_fstatat64_func = (fstatat64_func*)&fstatat64_wrapper;
 260 #endif
 261 
 262     /* supports futimes or futimesat */
 263 
 264 #ifdef _ALLBSD_SOURCE
 265     capabilities |= sun_nio_fs_UnixNativeDispatcher_SUPPORTS_FUTIMES;
 266 #else
 267     if (my_futimesat_func != NULL)
 268         capabilities |= sun_nio_fs_UnixNativeDispatcher_SUPPORTS_FUTIMES;
 269 #endif
 270 
 271     /* supports openat, etc. */
 272 
 273     if (my_openat64_func != NULL &&  my_fstatat64_func != NULL &&
 274         my_unlinkat_func != NULL && my_renameat_func != NULL &&
 275         my_futimesat_func != NULL && my_fdopendir_func != NULL)
 276     {
 277         capabilities |= sun_nio_fs_UnixNativeDispatcher_SUPPORTS_OPENAT;
 278     }
 279 
 280     /* supports file birthtime */
 281 
 282 #ifdef _DARWIN_FEATURE_64_BIT_INODE
 283     capabilities |= sun_nio_fs_UnixNativeDispatcher_SUPPORTS_BIRTHTIME;
 284 #endif
 285 
 286     return capabilities;
 287 }
 288 
 289 JNIEXPORT jbyteArray JNICALL
 290 Java_sun_nio_fs_UnixNativeDispatcher_getcwd(JNIEnv* env, jclass this) {
 291     jbyteArray result = NULL;
 292     char buf[PATH_MAX+1];
 293 
 294     /* EINTR not listed as a possible error */
 295     char* cwd = getcwd(buf, sizeof(buf));
 296     if (cwd == NULL) {
 297         throwUnixException(env, errno);
 298     } else {
 299         jsize len = (jsize)strlen(buf);
 300         result = (*env)->NewByteArray(env, len);
 301         if (result != NULL) {
 302             (*env)->SetByteArrayRegion(env, result, 0, len, (jbyte*)buf);
 303         }
 304     }
 305     return result;
 306 }
 307 
 308 JNIEXPORT jbyteArray
 309 Java_sun_nio_fs_UnixNativeDispatcher_strerror(JNIEnv* env, jclass this, jint error)
 310 {
 311     char* msg;
 312     jsize len;
 313     jbyteArray bytes;
 314 
 315 #ifdef _AIX
 316     /* strerror() is not thread-safe on AIX so we have to use strerror_r() */
 317     char buffer[256];
 318     msg = (strerror_r((int)error, buffer, 256) == 0) ? buffer : "Error while calling strerror_r";
 319 #else
 320     msg = strerror((int)error);
 321 #endif
 322     len = strlen(msg);
 323     bytes = (*env)->NewByteArray(env, len);
 324     if (bytes != NULL) {
 325         (*env)->SetByteArrayRegion(env, bytes, 0, len, (jbyte*)msg);
 326     }
 327     return bytes;
 328 }
 329 
 330 JNIEXPORT jint
 331 Java_sun_nio_fs_UnixNativeDispatcher_dup(JNIEnv* env, jclass this, jint fd) {
 332 
 333     int res = -1;
 334 
 335     RESTARTABLE(dup((int)fd), res);
 336     if (res == -1) {
 337         throwUnixException(env, errno);
 338     }
 339     return (jint)res;
 340 }
 341 
 342 JNIEXPORT jlong JNICALL
 343 Java_sun_nio_fs_UnixNativeDispatcher_fopen0(JNIEnv* env, jclass this,
 344     jlong pathAddress, jlong modeAddress)
 345 {
 346     FILE* fp = NULL;
 347     const char* path = (const char*)jlong_to_ptr(pathAddress);
 348     const char* mode = (const char*)jlong_to_ptr(modeAddress);
 349 
 350     do {
 351         fp = fopen(path, mode);
 352     } while (fp == NULL && errno == EINTR);
 353 
 354     if (fp == NULL) {
 355         throwUnixException(env, errno);
 356     }
 357 
 358     return ptr_to_jlong(fp);
 359 }
 360 
 361 JNIEXPORT void JNICALL
 362 Java_sun_nio_fs_UnixNativeDispatcher_fclose(JNIEnv* env, jclass this, jlong stream)
 363 {
 364     FILE* fp = jlong_to_ptr(stream);
 365 
 366     /* NOTE: fclose() wrapper is only used with read-only streams.
 367      * If it ever is used with write streams, it might be better to add
 368      * RESTARTABLE(fflush(fp)) before closing, to make sure the stream
 369      * is completely written even if fclose() failed.
 370      */
 371     if (fclose(fp) == EOF && errno != EINTR) {
 372         throwUnixException(env, errno);
 373     }
 374 }
 375 
 376 JNIEXPORT jint JNICALL
 377 Java_sun_nio_fs_UnixNativeDispatcher_open0(JNIEnv* env, jclass this,
 378     jlong pathAddress, jint oflags, jint mode)
 379 {
 380     jint fd;
 381     const char* path = (const char*)jlong_to_ptr(pathAddress);
 382 
 383     RESTARTABLE(open64(path, (int)oflags, (mode_t)mode), fd);
 384     if (fd == -1) {
 385         throwUnixException(env, errno);
 386     }
 387     return fd;
 388 }
 389 
 390 JNIEXPORT jint JNICALL
 391 Java_sun_nio_fs_UnixNativeDispatcher_openat0(JNIEnv* env, jclass this, jint dfd,
 392     jlong pathAddress, jint oflags, jint mode)
 393 {
 394     jint fd;
 395     const char* path = (const char*)jlong_to_ptr(pathAddress);
 396 
 397     if (my_openat64_func == NULL) {
 398         JNU_ThrowInternalError(env, "should not reach here");
 399         return -1;
 400     }
 401 
 402     RESTARTABLE((*my_openat64_func)(dfd, path, (int)oflags, (mode_t)mode), fd);
 403     if (fd == -1) {
 404         throwUnixException(env, errno);
 405     }
 406     return fd;
 407 }
 408 
 409 JNIEXPORT void JNICALL
 410 Java_sun_nio_fs_UnixNativeDispatcher_close(JNIEnv* env, jclass this, jint fd) {
 411     int err;
 412     /* TDB - need to decide if EIO and other errors should cause exception */
 413     RESTARTABLE(close((int)fd), err);
 414 }
 415 
 416 JNIEXPORT jint JNICALL
 417 Java_sun_nio_fs_UnixNativeDispatcher_read(JNIEnv* env, jclass this, jint fd,
 418     jlong address, jint nbytes)
 419 {
 420     ssize_t n;
 421     void* bufp = jlong_to_ptr(address);
 422     RESTARTABLE(read((int)fd, bufp, (size_t)nbytes), n);
 423     if (n == -1) {
 424         throwUnixException(env, errno);
 425     }
 426     return (jint)n;
 427 }
 428 
 429 JNIEXPORT jint JNICALL
 430 Java_sun_nio_fs_UnixNativeDispatcher_write(JNIEnv* env, jclass this, jint fd,
 431     jlong address, jint nbytes)
 432 {
 433     ssize_t n;
 434     void* bufp = jlong_to_ptr(address);
 435     RESTARTABLE(write((int)fd, bufp, (size_t)nbytes), n);
 436     if (n == -1) {
 437         throwUnixException(env, errno);
 438     }
 439     return (jint)n;
 440 }
 441 
 442 /**
 443  * Copy stat64 members into sun.nio.fs.UnixFileAttributes
 444  */
 445 static void prepAttributes(JNIEnv* env, struct stat64* buf, jobject attrs) {
 446     (*env)->SetIntField(env, attrs, attrs_st_mode, (jint)buf->st_mode);
 447     (*env)->SetLongField(env, attrs, attrs_st_ino, (jlong)buf->st_ino);
 448     (*env)->SetLongField(env, attrs, attrs_st_dev, (jlong)buf->st_dev);
 449     (*env)->SetLongField(env, attrs, attrs_st_rdev, (jlong)buf->st_rdev);
 450     (*env)->SetIntField(env, attrs, attrs_st_nlink, (jint)buf->st_nlink);
 451     (*env)->SetIntField(env, attrs, attrs_st_uid, (jint)buf->st_uid);
 452     (*env)->SetIntField(env, attrs, attrs_st_gid, (jint)buf->st_gid);
 453     (*env)->SetLongField(env, attrs, attrs_st_size, (jlong)buf->st_size);
 454     (*env)->SetLongField(env, attrs, attrs_st_atime_sec, (jlong)buf->st_atime);
 455     (*env)->SetLongField(env, attrs, attrs_st_mtime_sec, (jlong)buf->st_mtime);
 456     (*env)->SetLongField(env, attrs, attrs_st_ctime_sec, (jlong)buf->st_ctime);
 457 
 458 #ifdef _DARWIN_FEATURE_64_BIT_INODE
 459     (*env)->SetLongField(env, attrs, attrs_st_birthtime_sec, (jlong)buf->st_birthtime);
 460 #endif
 461 
 462 #if (_POSIX_C_SOURCE >= 200809L) || defined(__solaris__)
 463     (*env)->SetLongField(env, attrs, attrs_st_atime_nsec, (jlong)buf->st_atim.tv_nsec);
 464     (*env)->SetLongField(env, attrs, attrs_st_mtime_nsec, (jlong)buf->st_mtim.tv_nsec);
 465     (*env)->SetLongField(env, attrs, attrs_st_ctime_nsec, (jlong)buf->st_ctim.tv_nsec);
 466 #endif
 467 }
 468 
 469 JNIEXPORT void JNICALL
 470 Java_sun_nio_fs_UnixNativeDispatcher_stat0(JNIEnv* env, jclass this,
 471     jlong pathAddress, jobject attrs)
 472 {
 473     int err;
 474     struct stat64 buf;
 475     const char* path = (const char*)jlong_to_ptr(pathAddress);
 476 
 477     RESTARTABLE(stat64(path, &buf), err);
 478     if (err == -1) {
 479         throwUnixException(env, errno);
 480     } else {
 481         prepAttributes(env, &buf, attrs);
 482     }
 483 }
 484 
 485 JNIEXPORT void JNICALL
 486 Java_sun_nio_fs_UnixNativeDispatcher_lstat0(JNIEnv* env, jclass this,
 487     jlong pathAddress, jobject attrs)
 488 {
 489     int err;
 490     struct stat64 buf;
 491     const char* path = (const char*)jlong_to_ptr(pathAddress);
 492 
 493     RESTARTABLE(lstat64(path, &buf), err);
 494     if (err == -1) {
 495         throwUnixException(env, errno);
 496     } else {
 497         prepAttributes(env, &buf, attrs);
 498     }
 499 }
 500 
 501 JNIEXPORT void JNICALL
 502 Java_sun_nio_fs_UnixNativeDispatcher_fstat(JNIEnv* env, jclass this, jint fd,
 503     jobject attrs)
 504 {
 505     int err;
 506     struct stat64 buf;
 507 
 508     RESTARTABLE(fstat64((int)fd, &buf), err);
 509     if (err == -1) {
 510         throwUnixException(env, errno);
 511     } else {
 512         prepAttributes(env, &buf, attrs);
 513     }
 514 }
 515 
 516 JNIEXPORT void JNICALL
 517 Java_sun_nio_fs_UnixNativeDispatcher_fstatat0(JNIEnv* env, jclass this, jint dfd,
 518     jlong pathAddress, jint flag, jobject attrs)
 519 {
 520     int err;
 521     struct stat64 buf;
 522     const char* path = (const char*)jlong_to_ptr(pathAddress);
 523 
 524     if (my_fstatat64_func == NULL) {
 525         JNU_ThrowInternalError(env, "should not reach here");
 526         return;
 527     }
 528     RESTARTABLE((*my_fstatat64_func)((int)dfd, path, &buf, (int)flag), err);
 529     if (err == -1) {
 530         throwUnixException(env, errno);
 531     } else {
 532         prepAttributes(env, &buf, attrs);
 533     }
 534 }
 535 
 536 JNIEXPORT void JNICALL
 537 Java_sun_nio_fs_UnixNativeDispatcher_chmod0(JNIEnv* env, jclass this,
 538     jlong pathAddress, jint mode)
 539 {
 540     int err;
 541     const char* path = (const char*)jlong_to_ptr(pathAddress);
 542 
 543     RESTARTABLE(chmod(path, (mode_t)mode), err);
 544     if (err == -1) {
 545         throwUnixException(env, errno);
 546     }
 547 }
 548 
 549 JNIEXPORT void JNICALL
 550 Java_sun_nio_fs_UnixNativeDispatcher_fchmod(JNIEnv* env, jclass this, jint filedes,
 551     jint mode)
 552 {
 553     int err;
 554 
 555     RESTARTABLE(fchmod((int)filedes, (mode_t)mode), err);
 556     if (err == -1) {
 557         throwUnixException(env, errno);
 558     }
 559 }
 560 
 561 
 562 JNIEXPORT void JNICALL
 563 Java_sun_nio_fs_UnixNativeDispatcher_chown0(JNIEnv* env, jclass this,
 564     jlong pathAddress, jint uid, jint gid)
 565 {
 566     int err;
 567     const char* path = (const char*)jlong_to_ptr(pathAddress);
 568 
 569     RESTARTABLE(chown(path, (uid_t)uid, (gid_t)gid), err);
 570     if (err == -1) {
 571         throwUnixException(env, errno);
 572     }
 573 }
 574 
 575 JNIEXPORT void JNICALL
 576 Java_sun_nio_fs_UnixNativeDispatcher_lchown0(JNIEnv* env, jclass this, jlong pathAddress, jint uid, jint gid)
 577 {
 578     int err;
 579     const char* path = (const char*)jlong_to_ptr(pathAddress);
 580 
 581     RESTARTABLE(lchown(path, (uid_t)uid, (gid_t)gid), err);
 582     if (err == -1) {
 583         throwUnixException(env, errno);
 584     }
 585 }
 586 
 587 JNIEXPORT void JNICALL
 588 Java_sun_nio_fs_UnixNativeDispatcher_fchown(JNIEnv* env, jclass this, jint filedes, jint uid, jint gid)
 589 {
 590     int err;
 591 
 592     RESTARTABLE(fchown(filedes, (uid_t)uid, (gid_t)gid), err);
 593     if (err == -1) {
 594         throwUnixException(env, errno);
 595     }
 596 }
 597 
 598 JNIEXPORT void JNICALL
 599 Java_sun_nio_fs_UnixNativeDispatcher_utimes0(JNIEnv* env, jclass this,
 600     jlong pathAddress, jlong accessTime, jlong modificationTime)
 601 {
 602     int err;
 603     struct timeval times[2];
 604     const char* path = (const char*)jlong_to_ptr(pathAddress);
 605 
 606     times[0].tv_sec = accessTime / 1000000;
 607     times[0].tv_usec = accessTime % 1000000;
 608 
 609     times[1].tv_sec = modificationTime / 1000000;
 610     times[1].tv_usec = modificationTime % 1000000;
 611 
 612     RESTARTABLE(utimes(path, &times[0]), err);
 613     if (err == -1) {
 614         throwUnixException(env, errno);
 615     }
 616 }
 617 
 618 JNIEXPORT void JNICALL
 619 Java_sun_nio_fs_UnixNativeDispatcher_futimes(JNIEnv* env, jclass this, jint filedes,
 620     jlong accessTime, jlong modificationTime)
 621 {
 622     struct timeval times[2];
 623     int err = 0;
 624 
 625     times[0].tv_sec = accessTime / 1000000;
 626     times[0].tv_usec = accessTime % 1000000;
 627 
 628     times[1].tv_sec = modificationTime / 1000000;
 629     times[1].tv_usec = modificationTime % 1000000;
 630 
 631 #ifdef _ALLBSD_SOURCE
 632     RESTARTABLE(futimes(filedes, &times[0]), err);
 633 #else
 634     if (my_futimesat_func == NULL) {
 635         JNU_ThrowInternalError(env, "my_ftimesat_func is NULL");
 636         return;
 637     }
 638     RESTARTABLE((*my_futimesat_func)(filedes, NULL, &times[0]), err);
 639 #endif
 640     if (err == -1) {
 641         throwUnixException(env, errno);
 642     }
 643 }
 644 
 645 JNIEXPORT jlong JNICALL
 646 Java_sun_nio_fs_UnixNativeDispatcher_opendir0(JNIEnv* env, jclass this,
 647     jlong pathAddress)
 648 {
 649     DIR* dir;
 650     const char* path = (const char*)jlong_to_ptr(pathAddress);
 651 
 652     /* EINTR not listed as a possible error */
 653     dir = opendir(path);
 654     if (dir == NULL) {
 655         throwUnixException(env, errno);
 656     }
 657     return ptr_to_jlong(dir);
 658 }
 659 
 660 JNIEXPORT jlong JNICALL
 661 Java_sun_nio_fs_UnixNativeDispatcher_fdopendir(JNIEnv* env, jclass this, int dfd) {
 662     DIR* dir;
 663 
 664     if (my_fdopendir_func == NULL) {
 665         JNU_ThrowInternalError(env, "should not reach here");
 666         return (jlong)-1;
 667     }
 668 
 669     /* EINTR not listed as a possible error */
 670     dir = (*my_fdopendir_func)((int)dfd);
 671     if (dir == NULL) {
 672         throwUnixException(env, errno);
 673     }
 674     return ptr_to_jlong(dir);
 675 }
 676 
 677 JNIEXPORT void JNICALL
 678 Java_sun_nio_fs_UnixNativeDispatcher_closedir(JNIEnv* env, jclass this, jlong dir) {
 679     DIR* dirp = jlong_to_ptr(dir);
 680 
 681     if (closedir(dirp) == -1 && errno != EINTR) {
 682         throwUnixException(env, errno);
 683     }
 684 }
 685 
 686 JNIEXPORT jbyteArray JNICALL
 687 Java_sun_nio_fs_UnixNativeDispatcher_readdir(JNIEnv* env, jclass this, jlong value) {
 688     struct dirent64* result;
 689     struct {
 690         struct dirent64 buf;
 691         char name_extra[PATH_MAX + 1 - sizeof result->d_name];
 692     } entry;
 693     struct dirent64* ptr = &entry.buf;
 694     int res;
 695     DIR* dirp = jlong_to_ptr(value);
 696 
 697     /* EINTR not listed as a possible error */
 698     /* TDB: reentrant version probably not required here */
 699     res = readdir64_r(dirp, ptr, &result);
 700 
 701 #ifdef _AIX
 702     /* On AIX, readdir_r() returns EBADF (i.e. '9') and sets 'result' to NULL for the */
 703     /* directory stream end. Otherwise, 'errno' will contain the error code. */
 704     if (res != 0) {
 705         res = (result == NULL && res == EBADF) ? 0 : errno;
 706     }
 707 #endif
 708 
 709     if (res != 0) {
 710         throwUnixException(env, res);
 711         return NULL;
 712     } else {
 713         if (result == NULL) {
 714             return NULL;
 715         } else {
 716             jsize len = strlen(ptr->d_name);
 717             jbyteArray bytes = (*env)->NewByteArray(env, len);
 718             if (bytes != NULL) {
 719                 (*env)->SetByteArrayRegion(env, bytes, 0, len, (jbyte*)(ptr->d_name));
 720             }
 721             return bytes;
 722         }
 723     }
 724 }
 725 
 726 JNIEXPORT void JNICALL
 727 Java_sun_nio_fs_UnixNativeDispatcher_mkdir0(JNIEnv* env, jclass this,
 728     jlong pathAddress, jint mode)
 729 {
 730     const char* path = (const char*)jlong_to_ptr(pathAddress);
 731 
 732     /* EINTR not listed as a possible error */
 733     if (mkdir(path, (mode_t)mode) == -1) {
 734         throwUnixException(env, errno);
 735     }
 736 }
 737 
 738 JNIEXPORT void JNICALL
 739 Java_sun_nio_fs_UnixNativeDispatcher_rmdir0(JNIEnv* env, jclass this,
 740     jlong pathAddress)
 741 {
 742     const char* path = (const char*)jlong_to_ptr(pathAddress);
 743 
 744     /* EINTR not listed as a possible error */
 745     if (rmdir(path) == -1) {
 746         throwUnixException(env, errno);
 747     }
 748 }
 749 
 750 JNIEXPORT void JNICALL
 751 Java_sun_nio_fs_UnixNativeDispatcher_link0(JNIEnv* env, jclass this,
 752     jlong existingAddress, jlong newAddress)
 753 {
 754     int err;
 755     const char* existing = (const char*)jlong_to_ptr(existingAddress);
 756     const char* newname = (const char*)jlong_to_ptr(newAddress);
 757 
 758     RESTARTABLE(link(existing, newname), err);
 759     if (err == -1) {
 760         throwUnixException(env, errno);
 761     }
 762 }
 763 
 764 
 765 JNIEXPORT void JNICALL
 766 Java_sun_nio_fs_UnixNativeDispatcher_unlink0(JNIEnv* env, jclass this,
 767     jlong pathAddress)
 768 {
 769     const char* path = (const char*)jlong_to_ptr(pathAddress);
 770 
 771     /* EINTR not listed as a possible error */
 772     if (unlink(path) == -1) {
 773         throwUnixException(env, errno);
 774     }
 775 }
 776 
 777 JNIEXPORT void JNICALL
 778 Java_sun_nio_fs_UnixNativeDispatcher_unlinkat0(JNIEnv* env, jclass this, jint dfd,
 779                                                jlong pathAddress, jint flags)
 780 {
 781     const char* path = (const char*)jlong_to_ptr(pathAddress);
 782 
 783     if (my_unlinkat_func == NULL) {
 784         JNU_ThrowInternalError(env, "should not reach here");
 785         return;
 786     }
 787 
 788     /* EINTR not listed as a possible error */
 789     if ((*my_unlinkat_func)((int)dfd, path, (int)flags) == -1) {
 790         throwUnixException(env, errno);
 791     }
 792 }
 793 
 794 JNIEXPORT void JNICALL
 795 Java_sun_nio_fs_UnixNativeDispatcher_rename0(JNIEnv* env, jclass this,
 796     jlong fromAddress, jlong toAddress)
 797 {
 798     const char* from = (const char*)jlong_to_ptr(fromAddress);
 799     const char* to = (const char*)jlong_to_ptr(toAddress);
 800 
 801     /* EINTR not listed as a possible error */
 802     if (rename(from, to) == -1) {
 803         throwUnixException(env, errno);
 804     }
 805 }
 806 
 807 JNIEXPORT void JNICALL
 808 Java_sun_nio_fs_UnixNativeDispatcher_renameat0(JNIEnv* env, jclass this,
 809     jint fromfd, jlong fromAddress, jint tofd, jlong toAddress)
 810 {
 811     const char* from = (const char*)jlong_to_ptr(fromAddress);
 812     const char* to = (const char*)jlong_to_ptr(toAddress);
 813 
 814     if (my_renameat_func == NULL) {
 815         JNU_ThrowInternalError(env, "should not reach here");
 816         return;
 817     }
 818 
 819     /* EINTR not listed as a possible error */
 820     if ((*my_renameat_func)((int)fromfd, from, (int)tofd, to) == -1) {
 821         throwUnixException(env, errno);
 822     }
 823 }
 824 
 825 JNIEXPORT void JNICALL
 826 Java_sun_nio_fs_UnixNativeDispatcher_symlink0(JNIEnv* env, jclass this,
 827     jlong targetAddress, jlong linkAddress)
 828 {
 829     const char* target = (const char*)jlong_to_ptr(targetAddress);
 830     const char* link = (const char*)jlong_to_ptr(linkAddress);
 831 
 832     /* EINTR not listed as a possible error */
 833     if (symlink(target, link) == -1) {
 834         throwUnixException(env, errno);
 835     }
 836 }
 837 
 838 JNIEXPORT jbyteArray JNICALL
 839 Java_sun_nio_fs_UnixNativeDispatcher_readlink0(JNIEnv* env, jclass this,
 840     jlong pathAddress)
 841 {
 842     jbyteArray result = NULL;
 843     char target[PATH_MAX+1];
 844     const char* path = (const char*)jlong_to_ptr(pathAddress);
 845 
 846     /* EINTR not listed as a possible error */
 847     int n = readlink(path, target, sizeof(target));
 848     if (n == -1) {
 849         throwUnixException(env, errno);
 850     } else {
 851         jsize len;
 852         if (n == sizeof(target)) {
 853             n--;
 854         }
 855         target[n] = '\0';
 856         len = (jsize)strlen(target);
 857         result = (*env)->NewByteArray(env, len);
 858         if (result != NULL) {
 859             (*env)->SetByteArrayRegion(env, result, 0, len, (jbyte*)target);
 860         }
 861     }
 862     return result;
 863 }
 864 
 865 JNIEXPORT jbyteArray JNICALL
 866 Java_sun_nio_fs_UnixNativeDispatcher_realpath0(JNIEnv* env, jclass this,
 867     jlong pathAddress)
 868 {
 869     jbyteArray result = NULL;
 870     char resolved[PATH_MAX+1];
 871     const char* path = (const char*)jlong_to_ptr(pathAddress);
 872 
 873     /* EINTR not listed as a possible error */
 874     if (realpath(path, resolved) == NULL) {
 875         throwUnixException(env, errno);
 876     } else {
 877         jsize len = (jsize)strlen(resolved);
 878         result = (*env)->NewByteArray(env, len);
 879         if (result != NULL) {
 880             (*env)->SetByteArrayRegion(env, result, 0, len, (jbyte*)resolved);
 881         }
 882     }
 883     return result;
 884 }
 885 
 886 JNIEXPORT void JNICALL
 887 Java_sun_nio_fs_UnixNativeDispatcher_access0(JNIEnv* env, jclass this,
 888     jlong pathAddress, jint amode)
 889 {
 890     int err;
 891     const char* path = (const char*)jlong_to_ptr(pathAddress);
 892 
 893     RESTARTABLE(access(path, (int)amode), err);
 894     if (err == -1) {
 895         throwUnixException(env, errno);
 896     }
 897 }
 898 
 899 JNIEXPORT void JNICALL
 900 Java_sun_nio_fs_UnixNativeDispatcher_statvfs0(JNIEnv* env, jclass this,
 901     jlong pathAddress, jobject attrs)
 902 {
 903     int err;
 904     struct statvfs64 buf;
 905     const char* path = (const char*)jlong_to_ptr(pathAddress);
 906 
 907 
 908     RESTARTABLE(statvfs64(path, &buf), err);
 909     if (err == -1) {
 910         throwUnixException(env, errno);
 911     } else {
 912 #ifdef _AIX
 913         /* AIX returns ULONG_MAX in buf.f_blocks for the /proc file system. */
 914         /* This is too big for a Java signed long and fools various tests.  */
 915         if (buf.f_blocks == ULONG_MAX) {
 916             buf.f_blocks = 0;
 917         }
 918         /* The number of free or available blocks can never exceed the total number of blocks */
 919         if (buf.f_blocks == 0) {
 920             buf.f_bfree = 0;
 921             buf.f_bavail = 0;
 922         }
 923 #endif
 924         (*env)->SetLongField(env, attrs, attrs_f_frsize, long_to_jlong(buf.f_frsize));
 925         (*env)->SetLongField(env, attrs, attrs_f_blocks, long_to_jlong(buf.f_blocks));
 926         (*env)->SetLongField(env, attrs, attrs_f_bfree,  long_to_jlong(buf.f_bfree));
 927         (*env)->SetLongField(env, attrs, attrs_f_bavail, long_to_jlong(buf.f_bavail));
 928     }
 929 }
 930 
 931 JNIEXPORT jlong JNICALL
 932 Java_sun_nio_fs_UnixNativeDispatcher_pathconf0(JNIEnv* env, jclass this,
 933     jlong pathAddress, jint name)
 934 {
 935     long err;
 936     const char* path = (const char*)jlong_to_ptr(pathAddress);
 937 
 938     err = pathconf(path, (int)name);
 939     if (err == -1) {
 940         throwUnixException(env, errno);
 941     }
 942     return (jlong)err;
 943 }
 944 
 945 JNIEXPORT jlong JNICALL
 946 Java_sun_nio_fs_UnixNativeDispatcher_fpathconf(JNIEnv* env, jclass this,
 947     jint fd, jint name)
 948 {
 949     long err;
 950 
 951     err = fpathconf((int)fd, (int)name);
 952     if (err == -1) {
 953         throwUnixException(env, errno);
 954     }
 955     return (jlong)err;
 956 }
 957 
 958 JNIEXPORT void JNICALL
 959 Java_sun_nio_fs_UnixNativeDispatcher_mknod0(JNIEnv* env, jclass this,
 960     jlong pathAddress, jint mode, jlong dev)
 961 {
 962     int err;
 963     const char* path = (const char*)jlong_to_ptr(pathAddress);
 964 
 965     RESTARTABLE(mknod(path, (mode_t)mode, (dev_t)dev), err);
 966     if (err == -1) {
 967         throwUnixException(env, errno);
 968     }
 969 }
 970 
 971 JNIEXPORT jbyteArray JNICALL
 972 Java_sun_nio_fs_UnixNativeDispatcher_getpwuid(JNIEnv* env, jclass this, jint uid)
 973 {
 974     jbyteArray result = NULL;
 975     int buflen;
 976     char* pwbuf;
 977 
 978     /* allocate buffer for password record */
 979     buflen = (int)sysconf(_SC_GETPW_R_SIZE_MAX);
 980     if (buflen == -1)
 981         buflen = ENT_BUF_SIZE;
 982     pwbuf = (char*)malloc(buflen);
 983     if (pwbuf == NULL) {
 984         JNU_ThrowOutOfMemoryError(env, "native heap");
 985     } else {
 986         struct passwd pwent;
 987         struct passwd* p = NULL;
 988         int res = 0;
 989 
 990         errno = 0;
 991         #ifdef __solaris__
 992             RESTARTABLE_RETURN_PTR(getpwuid_r((uid_t)uid, &pwent, pwbuf, (size_t)buflen), p);
 993         #else
 994             RESTARTABLE(getpwuid_r((uid_t)uid, &pwent, pwbuf, (size_t)buflen, &p), res);
 995         #endif
 996 
 997         if (res != 0 || p == NULL || p->pw_name == NULL || *(p->pw_name) == '\0') {
 998             /* not found or error */
 999             if (errno == 0)
1000                 errno = ENOENT;
1001             throwUnixException(env, errno);
1002         } else {
1003             jsize len = strlen(p->pw_name);
1004             result = (*env)->NewByteArray(env, len);
1005             if (result != NULL) {
1006                 (*env)->SetByteArrayRegion(env, result, 0, len, (jbyte*)(p->pw_name));
1007             }
1008         }
1009         free(pwbuf);
1010     }
1011 
1012     return result;
1013 }
1014 
1015 
1016 JNIEXPORT jbyteArray JNICALL
1017 Java_sun_nio_fs_UnixNativeDispatcher_getgrgid(JNIEnv* env, jclass this, jint gid)
1018 {
1019     jbyteArray result = NULL;
1020     int buflen;
1021     int retry;
1022 
1023     /* initial size of buffer for group record */
1024     buflen = (int)sysconf(_SC_GETGR_R_SIZE_MAX);
1025     if (buflen == -1)
1026         buflen = ENT_BUF_SIZE;
1027 
1028     do {
1029         struct group grent;
1030         struct group* g = NULL;
1031         int res = 0;
1032 
1033         char* grbuf = (char*)malloc(buflen);
1034         if (grbuf == NULL) {
1035             JNU_ThrowOutOfMemoryError(env, "native heap");
1036             return NULL;
1037         }
1038 
1039         errno = 0;
1040         #ifdef __solaris__
1041             RESTARTABLE_RETURN_PTR(getgrgid_r((gid_t)gid, &grent, grbuf, (size_t)buflen), g);
1042         #else
1043             RESTARTABLE(getgrgid_r((gid_t)gid, &grent, grbuf, (size_t)buflen, &g), res);
1044         #endif
1045 
1046         retry = 0;
1047         if (res != 0 || g == NULL || g->gr_name == NULL || *(g->gr_name) == '\0') {
1048             /* not found or error */
1049             if (errno == ERANGE) {
1050                 /* insufficient buffer size so need larger buffer */
1051                 buflen += ENT_BUF_SIZE;
1052                 retry = 1;
1053             } else {
1054                 if (errno == 0)
1055                     errno = ENOENT;
1056                 throwUnixException(env, errno);
1057             }
1058         } else {
1059             jsize len = strlen(g->gr_name);
1060             result = (*env)->NewByteArray(env, len);
1061             if (result != NULL) {
1062                 (*env)->SetByteArrayRegion(env, result, 0, len, (jbyte*)(g->gr_name));
1063             }
1064         }
1065 
1066         free(grbuf);
1067 
1068     } while (retry);
1069 
1070     return result;
1071 }
1072 
1073 JNIEXPORT jint JNICALL
1074 Java_sun_nio_fs_UnixNativeDispatcher_getpwnam0(JNIEnv* env, jclass this,
1075     jlong nameAddress)
1076 {
1077     jint uid = -1;
1078     int buflen;
1079     char* pwbuf;
1080 
1081     /* allocate buffer for password record */
1082     buflen = (int)sysconf(_SC_GETPW_R_SIZE_MAX);
1083     if (buflen == -1)
1084         buflen = ENT_BUF_SIZE;
1085     pwbuf = (char*)malloc(buflen);
1086     if (pwbuf == NULL) {
1087         JNU_ThrowOutOfMemoryError(env, "native heap");
1088     } else {
1089         struct passwd pwent;
1090         struct passwd* p = NULL;
1091         int res = 0;
1092         const char* name = (const char*)jlong_to_ptr(nameAddress);
1093 
1094         errno = 0;
1095         #ifdef __solaris__
1096             RESTARTABLE_RETURN_PTR(getpwnam_r(name, &pwent, pwbuf, (size_t)buflen), p);
1097         #else
1098             RESTARTABLE(getpwnam_r(name, &pwent, pwbuf, (size_t)buflen, &p), res);
1099         #endif
1100 
1101         if (res != 0 || p == NULL || p->pw_name == NULL || *(p->pw_name) == '\0') {
1102             /* not found or error */
1103             if (errno != 0 && errno != ENOENT && errno != ESRCH)
1104                 throwUnixException(env, errno);
1105         } else {
1106             uid = p->pw_uid;
1107         }
1108         free(pwbuf);
1109     }
1110 
1111     return uid;
1112 }
1113 
1114 JNIEXPORT jint JNICALL
1115 Java_sun_nio_fs_UnixNativeDispatcher_getgrnam0(JNIEnv* env, jclass this,
1116     jlong nameAddress)
1117 {
1118     jint gid = -1;
1119     int buflen, retry;
1120 
1121     /* initial size of buffer for group record */
1122     buflen = (int)sysconf(_SC_GETGR_R_SIZE_MAX);
1123     if (buflen == -1)
1124         buflen = ENT_BUF_SIZE;
1125 
1126     do {
1127         struct group grent;
1128         struct group* g = NULL;
1129         int res = 0;
1130         char *grbuf;
1131         const char* name = (const char*)jlong_to_ptr(nameAddress);
1132 
1133         grbuf = (char*)malloc(buflen);
1134         if (grbuf == NULL) {
1135             JNU_ThrowOutOfMemoryError(env, "native heap");
1136             return -1;
1137         }
1138 
1139         errno = 0;
1140         #ifdef __solaris__
1141             RESTARTABLE_RETURN_PTR(getgrnam_r(name, &grent, grbuf, (size_t)buflen), g);
1142         #else
1143             RESTARTABLE(getgrnam_r(name, &grent, grbuf, (size_t)buflen, &g), res);
1144         #endif
1145 
1146         retry = 0;
1147         if (res != 0 || g == NULL || g->gr_name == NULL || *(g->gr_name) == '\0') {
1148             /* not found or error */
1149             if (errno != 0 && errno != ENOENT && errno != ESRCH) {
1150                 if (errno == ERANGE) {
1151                     /* insufficient buffer size so need larger buffer */
1152                     buflen += ENT_BUF_SIZE;
1153                     retry = 1;
1154                 } else {
1155                     throwUnixException(env, errno);
1156                 }
1157             }
1158         } else {
1159             gid = g->gr_gid;
1160         }
1161 
1162         free(grbuf);
1163 
1164     } while (retry);
1165 
1166     return gid;
1167 }