1 /*
   2  * Copyright (c) 1999, 2019, 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_OS_LINUX_INLINE_HPP
  26 #define OS_LINUX_OS_LINUX_INLINE_HPP
  27 
  28 #include "runtime/os.hpp"
  29 #include "os_posix.inline.hpp"
  30 
  31 // System includes
  32 
  33 #include <unistd.h>
  34 #include <sys/socket.h>
  35 #include <poll.h>
  36 #include <netdb.h>
  37 
  38 inline bool os::uses_stack_guard_pages() {
  39   return true;
  40 }
  41 
  42 inline bool os::must_commit_stack_guard_pages() {
  43   assert(uses_stack_guard_pages(), "sanity check");
  44   return true;
  45 }
  46 
  47 
  48 // On Linux, reservations are made on a page by page basis, nothing to do.
  49 inline void os::pd_split_reserved_memory(char *base, size_t size,
  50                                       size_t split, bool realloc) {
  51 }
  52 
  53 
  54 // Bang the shadow pages if they need to be touched to be mapped.
  55 inline void os::map_stack_shadow_pages(address sp) {
  56 }
  57 
  58 inline void os::dll_unload(void *lib) {
  59   ::dlclose(lib);
  60 }
  61 
  62 inline jlong os::lseek(int fd, jlong offset, int whence) {
  63   return (jlong) ::lseek64(fd, offset, whence);
  64 }
  65 
  66 inline int os::fsync(int fd) {
  67   return ::fsync(fd);
  68 }
  69 
  70 inline int os::ftruncate(int fd, jlong length) {
  71   return ::ftruncate64(fd, length);
  72 }
  73 
  74 // macros for restartable system calls
  75 
  76 #define RESTARTABLE(_cmd, _result) do { \
  77     _result = _cmd; \
  78   } while(((int)_result == OS_ERR) && (errno == EINTR))
  79 
  80 #define RESTARTABLE_RETURN_INT(_cmd) do { \
  81   int _result; \
  82   RESTARTABLE(_cmd, _result); \
  83   return _result; \
  84 } while(false)
  85 
  86 inline bool os::numa_has_static_binding()   { return true; }
  87 inline bool os::numa_has_group_homing()     { return false;  }
  88 
  89 inline size_t os::write(int fd, const void *buf, unsigned int nBytes) {
  90   size_t res;
  91   RESTARTABLE((size_t) ::write(fd, buf, (size_t) nBytes), res);
  92   return res;
  93 }
  94 
  95 inline int os::close(int fd) {
  96   return ::close(fd);
  97 }
  98 
  99 inline int os::socket_close(int fd) {
 100   return ::close(fd);
 101 }
 102 
 103 inline int os::socket(int domain, int type, int protocol) {
 104   return ::socket(domain, type, protocol);
 105 }
 106 
 107 inline int os::recv(int fd, char* buf, size_t nBytes, uint flags) {
 108   RESTARTABLE_RETURN_INT(::recv(fd, buf, nBytes, flags));
 109 }
 110 
 111 inline int os::send(int fd, char* buf, size_t nBytes, uint flags) {
 112   RESTARTABLE_RETURN_INT(::send(fd, buf, nBytes, flags));
 113 }
 114 
 115 inline int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) {
 116   return os::send(fd, buf, nBytes, flags);
 117 }
 118 
 119 inline int os::connect(int fd, struct sockaddr* him, socklen_t len) {
 120   RESTARTABLE_RETURN_INT(::connect(fd, him, len));
 121 }
 122 
 123 inline struct hostent* os::get_host_by_name(char* name) {
 124   return ::gethostbyname(name);
 125 }
 126 
 127 inline bool os::supports_monotonic_clock() {
 128   return os::Posix::supports_monotonic_clock();
 129 }
 130 
 131 inline void os::exit(int num) {
 132   ::exit(num);
 133 }
 134 
 135 #endif // OS_LINUX_OS_LINUX_INLINE_HPP