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 // readdir_r has been deprecated since glibc 2.24.
 102 // See https://sourceware.org/bugzilla/show_bug.cgi?id=19056 for more details.
 103 #pragma GCC diagnostic push
 104 #pragma GCC diagnostic ignored "-Wdeprecated-declarations"
 105 
 106   dirent* p;
 107   int status;
 108   assert(dirp != NULL, "just checking");
 109 
 110   // NOTE: Linux readdir_r (on RH 6.2 and 7.2 at least) is NOT like the POSIX
 111   // version. Here is the doc for this function:
 112   // http://www.gnu.org/manual/glibc-2.2.3/html_node/libc_262.html
 113 
 114   if((status = ::readdir_r(dirp, dbuf, &p)) != 0) {
 115     errno = status;
 116     return NULL;
 117   } else
 118     return p;
 119 
 120 #pragma GCC diagnostic pop
 121 }
 122 
 123 inline int os::closedir(DIR *dirp) {
 124   assert(dirp != NULL, "argument is NULL");
 125   return ::closedir(dirp);
 126 }
 127 
 128 // macros for restartable system calls
 129 
 130 #define RESTARTABLE(_cmd, _result) do { \
 131     _result = _cmd; \
 132   } while(((int)_result == OS_ERR) && (errno == EINTR))
 133 
 134 #define RESTARTABLE_RETURN_INT(_cmd) do { \
 135   int _result; \
 136   RESTARTABLE(_cmd, _result); \
 137   return _result; \
 138 } while(false)
 139 
 140 inline bool os::numa_has_static_binding()   { return true; }
 141 inline bool os::numa_has_group_homing()     { return false;  }
 142 
 143 inline size_t os::restartable_read(int fd, void *buf, unsigned int nBytes) {
 144   size_t res;
 145   RESTARTABLE( (size_t) ::read(fd, buf, (size_t) nBytes), res);
 146   return res;
 147 }
 148 
 149 inline size_t os::write(int fd, const void *buf, unsigned int nBytes) {
 150   size_t res;
 151   RESTARTABLE((size_t) ::write(fd, buf, (size_t) nBytes), res);
 152   return res;
 153 }
 154 
 155 inline int os::close(int fd) {
 156   return ::close(fd);
 157 }
 158 
 159 inline int os::socket_close(int fd) {
 160   return ::close(fd);
 161 }
 162 
 163 inline int os::socket(int domain, int type, int protocol) {
 164   return ::socket(domain, type, protocol);
 165 }
 166 
 167 inline int os::recv(int fd, char* buf, size_t nBytes, uint flags) {
 168   RESTARTABLE_RETURN_INT(::recv(fd, buf, nBytes, flags));
 169 }
 170 
 171 inline int os::send(int fd, char* buf, size_t nBytes, uint flags) {
 172   RESTARTABLE_RETURN_INT(::send(fd, buf, nBytes, flags));
 173 }
 174 
 175 inline int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) {
 176   return os::send(fd, buf, nBytes, flags);
 177 }
 178 
 179 inline int os::connect(int fd, struct sockaddr* him, socklen_t len) {
 180   RESTARTABLE_RETURN_INT(::connect(fd, him, len));
 181 }
 182 
 183 inline struct hostent* os::get_host_by_name(char* name) {
 184   return ::gethostbyname(name);
 185 }
 186 
 187 inline bool os::supports_monotonic_clock() {
 188   return Linux::_clock_gettime != NULL;
 189 }
 190 
 191 inline void os::exit(int num) {
 192   ::exit(num);
 193 }
 194 
 195 #endif // OS_LINUX_VM_OS_LINUX_INLINE_HPP
--- EOF ---