1 /*

     2  * Copyright (c) 1999, 2016, 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.

     8  *

     9  * This code is distributed in the hope that it will be useful, but WITHOUT

    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    12  * version 2 for more details (a copy is included in the LICENSE file that

    13  * accompanied this code).

    14  *

    15  * You should have received a copy of the GNU General Public License version

    16  * 2 along with this work; if not, write to the Free Software Foundation,

    17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    18  *

    19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    20  * or visit www.oracle.com if you need additional information or have any

    21  * questions.

    22  *

    23  */

    24 

    25 #ifndef OS_LINUX_VM_OS_LINUX_INLINE_HPP

    26 #define OS_LINUX_VM_OS_LINUX_INLINE_HPP

    27 

    28 #include "runtime/os.hpp"

    29 

    30 // System includes

    31 

    32 #include <unistd.h>

    33 #include <sys/socket.h>

    34 #include <poll.h>

    35 #include <netdb.h>

    36 

    37 // File names are case-sensitive on windows only

    38 inline int os::file_name_strcmp(const char* s1, const char* s2) {

    39   return strcmp(s1, s2);

    40 }

    41 

    42 inline bool os::obsolete_option(const JavaVMOption *option) {

    43   return false;

    44 }

    45 

    46 inline bool os::uses_stack_guard_pages() {

    47   return true;

    48 }

    49 

    50 inline bool os::must_commit_stack_guard_pages() {

    51   assert(uses_stack_guard_pages(), "sanity check");

    52   return true;

    53 }

    54 

    55 

    56 // On Linux, reservations are made on a page by page basis, nothing to do.

    57 inline void os::pd_split_reserved_memory(char *base, size_t size,

    58                                       size_t split, bool realloc) {

    59 }

    60 

    61 

    62 // Bang the shadow pages if they need to be touched to be mapped.

    63 inline void os::map_stack_shadow_pages(address sp) {

    64 }

    65 

    66 inline void os::dll_unload(void *lib) {

    67   ::dlclose(lib);

    68 }

    69 

    70 inline const int os::default_file_open_flags() { return 0;}

    71 

    72 inline DIR* os::opendir(const char* dirname)

    73 {

    74   assert(dirname != NULL, "just checking");

    75   return ::opendir(dirname);

    76 }

    77 

    78 inline int os::readdir_buf_size(const char *path)

    79 {

    80   return NAME_MAX + sizeof(dirent) + 1;

    81 }

    82 

    83 inline jlong os::lseek(int fd, jlong offset, int whence) {

    84   return (jlong) ::lseek64(fd, offset, whence);

    85 }

    86 

    87 inline int os::fsync(int fd) {

    88   return ::fsync(fd);

    89 }

    90 

    91 inline char* os::native_path(char *path) {

    92   return path;

    93 }

    94 

    95 inline int os::ftruncate(int fd, jlong length) {

    96   return ::ftruncate64(fd, length);

    97 }

    98 

    99 inline struct dirent* os::readdir(DIR* dirp, dirent *dbuf)

   100 {

   101   dirent* p;

   102   int status;

   103   assert(dirp != NULL, "just checking");

   104 

   105   // NOTE: Linux readdir_r (on RH 6.2 and 7.2 at least) is NOT like the POSIX

   106   // version. Here is the doc for this function:

   107   // http://www.gnu.org/manual/glibc-2.2.3/html_node/libc_262.html

   108 

   109   if((status = ::readdir_r(dirp, dbuf, &p)) != 0) {

   110     errno = status;

   111     return NULL;

   112   } else

   113     return p;

   114 }

   115 

   116 inline int os::closedir(DIR *dirp) {

   117   assert(dirp != NULL, "argument is NULL");

   118   return ::closedir(dirp);

   119 }

   120 

   121 // macros for restartable system calls

   122 

   123 #define RESTARTABLE(_cmd, _result) do { \

   124     _result = _cmd; \

   125   } while(((int)_result == OS_ERR) && (errno == EINTR))

   126 

   127 #define RESTARTABLE_RETURN_INT(_cmd) do { \

   128   int _result; \

   129   RESTARTABLE(_cmd, _result); \

   130   return _result; \

   131 } while(false)

   132 

   133 inline bool os::numa_has_static_binding()   { return true; }

   134 inline bool os::numa_has_group_homing()     { return false;  }

   135 

   136 inline size_t os::restartable_read(int fd, void *buf, unsigned int nBytes) {

   137   size_t res;

   138   RESTARTABLE( (size_t) ::read(fd, buf, (size_t) nBytes), res);

   139   return res;

   140 }

   141 

   142 inline size_t os::write(int fd, const void *buf, unsigned int nBytes) {

   143   size_t res;

   144   RESTARTABLE((size_t) ::write(fd, buf, (size_t) nBytes), res);

   145   return res;

   146 }

   147 

   148 inline int os::close(int fd) {

   149   return ::close(fd);

   150 }

   151 

   152 inline int os::socket_close(int fd) {

   153   return ::close(fd);

   154 }

   155 

   156 inline int os::socket(int domain, int type, int protocol) {

   157   return ::socket(domain, type, protocol);

   158 }

   159 

   160 inline int os::recv(int fd, char* buf, size_t nBytes, uint flags) {

   161   RESTARTABLE_RETURN_INT(::recv(fd, buf, nBytes, flags));

   162 }

   163 

   164 inline int os::send(int fd, char* buf, size_t nBytes, uint flags) {

   165   RESTARTABLE_RETURN_INT(::send(fd, buf, nBytes, flags));

   166 }

   167 

   168 inline int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) {

   169   return os::send(fd, buf, nBytes, flags);

   170 }

   171 

   172 inline int os::connect(int fd, struct sockaddr* him, socklen_t len) {

   173   RESTARTABLE_RETURN_INT(::connect(fd, him, len));

   174 }

   175 

   176 inline struct hostent* os::get_host_by_name(char* name) {

   177   return ::gethostbyname(name);

   178 }

   179 

   180 inline bool os::supports_monotonic_clock() {

   181   return Linux::_clock_gettime != NULL;

   182 }

   183 

   184 inline void os::exit(int num) {

   185   ::exit(num);

   186 }

   187 

   188 #endif // OS_LINUX_VM_OS_LINUX_INLINE_HPP