1 /*
   2  * Copyright (c) 1999, 2018, 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-insensitive on windows only
  38 inline int os::file_name_strncmp(const char* s1, const char* s2, size_t num) {
  39   return strncmp(s1, s2, num);
  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   assert(dirp != NULL, "just checking");
 102   return ::readdir(dirp);
 103 }
 104 
 105 inline int os::closedir(DIR *dirp) {
 106   assert(dirp != NULL, "argument is NULL");
 107   return ::closedir(dirp);
 108 }
 109 
 110 // macros for restartable system calls
 111 
 112 #define RESTARTABLE(_cmd, _result) do { \
 113     _result = _cmd; \
 114   } while(((int)_result == OS_ERR) && (errno == EINTR))
 115 
 116 #define RESTARTABLE_RETURN_INT(_cmd) do { \
 117   int _result; \
 118   RESTARTABLE(_cmd, _result); \
 119   return _result; \
 120 } while(false)
 121 
 122 inline bool os::numa_has_static_binding()   { return true; }
 123 inline bool os::numa_has_group_homing()     { return false;  }
 124 
 125 inline size_t os::restartable_read(int fd, void *buf, unsigned int nBytes) {
 126   size_t res;
 127   RESTARTABLE( (size_t) ::read(fd, buf, (size_t) nBytes), res);
 128   return res;
 129 }
 130 
 131 inline size_t os::write(int fd, const void *buf, unsigned int nBytes) {
 132   size_t res;
 133   RESTARTABLE((size_t) ::write(fd, buf, (size_t) nBytes), res);
 134   return res;
 135 }
 136 
 137 inline int os::close(int fd) {
 138   return ::close(fd);
 139 }
 140 
 141 inline int os::socket_close(int fd) {
 142   return ::close(fd);
 143 }
 144 
 145 inline int os::socket(int domain, int type, int protocol) {
 146   return ::socket(domain, type, protocol);
 147 }
 148 
 149 inline int os::recv(int fd, char* buf, size_t nBytes, uint flags) {
 150   RESTARTABLE_RETURN_INT(::recv(fd, buf, nBytes, flags));
 151 }
 152 
 153 inline int os::send(int fd, char* buf, size_t nBytes, uint flags) {
 154   RESTARTABLE_RETURN_INT(::send(fd, buf, nBytes, flags));
 155 }
 156 
 157 inline int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) {
 158   return os::send(fd, buf, nBytes, flags);
 159 }
 160 
 161 inline int os::connect(int fd, struct sockaddr* him, socklen_t len) {
 162   RESTARTABLE_RETURN_INT(::connect(fd, him, len));
 163 }
 164 
 165 inline struct hostent* os::get_host_by_name(char* name) {
 166   return ::gethostbyname(name);
 167 }
 168 
 169 inline bool os::supports_monotonic_clock() {
 170   return Linux::_clock_gettime != NULL;
 171 }
 172 
 173 inline void os::exit(int num) {
 174   ::exit(num);
 175 }
 176 
 177 #endif // OS_LINUX_VM_OS_LINUX_INLINE_HPP
--- EOF ---