1 /*
   2  * Copyright (c) 1999, 2014, 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 <sys/poll.h>
  35 #include <netdb.h>
  36 
  37 inline void* os::thread_local_storage_at(int index) {
  38   return pthread_getspecific((pthread_key_t)index);
  39 }
  40 
  41 // File names are case-sensitive on windows only
  42 inline int os::file_name_strcmp(const char* s1, const char* s2) {
  43   return strcmp(s1, s2);
  44 }
  45 
  46 inline bool os::obsolete_option(const JavaVMOption *option) {
  47   return false;
  48 }
  49 
  50 inline bool os::uses_stack_guard_pages() {
  51   return true;
  52 }
  53 
  54 inline bool os::allocate_stack_guard_pages() {
  55   assert(uses_stack_guard_pages(), "sanity check");
  56   return true;
  57 }
  58 
  59 
  60 // On Linux, reservations are made on a page by page basis, nothing to do.
  61 inline void os::pd_split_reserved_memory(char *base, size_t size,
  62                                       size_t split, bool realloc) {
  63 }
  64 
  65 
  66 // Bang the shadow pages if they need to be touched to be mapped.
  67 inline void os::bang_stack_shadow_pages() {
  68 }
  69 
  70 inline void os::dll_unload(void *lib) {
  71   ::dlclose(lib);
  72 }
  73 
  74 inline const int os::default_file_open_flags() { return 0;}
  75 
  76 inline DIR* os::opendir(const char* dirname)
  77 {
  78   assert(dirname != NULL, "just checking");
  79   return ::opendir(dirname);
  80 }
  81 
  82 inline int os::readdir_buf_size(const char *path)
  83 {
  84   return NAME_MAX + sizeof(dirent) + 1;
  85 }
  86 
  87 inline jlong os::lseek(int fd, jlong offset, int whence) {
  88   return (jlong) ::lseek64(fd, offset, whence);
  89 }
  90 
  91 inline int os::fsync(int fd) {
  92   return ::fsync(fd);
  93 }
  94 
  95 inline char* os::native_path(char *path) {
  96   return path;
  97 }
  98 
  99 inline int os::ftruncate(int fd, jlong length) {
 100   return ::ftruncate64(fd, length);
 101 }
 102 
 103 inline struct dirent* os::readdir(DIR* dirp, dirent *dbuf)
 104 {
 105   dirent* p;
 106   int status;
 107   assert(dirp != NULL, "just checking");
 108 
 109   // NOTE: Linux readdir_r (on RH 6.2 and 7.2 at least) is NOT like the POSIX
 110   // version. Here is the doc for this function:
 111   // http://www.gnu.org/manual/glibc-2.2.3/html_node/libc_262.html
 112 
 113   if((status = ::readdir_r(dirp, dbuf, &p)) != 0) {
 114     errno = status;
 115     return NULL;
 116   } else
 117     return p;
 118 }
 119 
 120 inline int os::closedir(DIR *dirp) {
 121   assert(dirp != NULL, "argument is NULL");
 122   return ::closedir(dirp);
 123 }
 124 
 125 // macros for restartable system calls
 126 
 127 #define RESTARTABLE(_cmd, _result) do { \
 128     _result = _cmd; \
 129   } while(((int)_result == OS_ERR) && (errno == EINTR))
 130 
 131 #define RESTARTABLE_RETURN_INT(_cmd) do { \
 132   int _result; \
 133   RESTARTABLE(_cmd, _result); \
 134   return _result; \
 135 } while(false)
 136 
 137 inline bool os::numa_has_static_binding()   { return true; }
 138 inline bool os::numa_has_group_homing()     { return false;  }
 139 
 140 inline size_t os::restartable_read(int fd, void *buf, unsigned int nBytes) {
 141   size_t res;
 142   RESTARTABLE( (size_t) ::read(fd, buf, (size_t) nBytes), res);
 143   return res;
 144 }
 145 
 146 inline size_t os::write(int fd, const void *buf, unsigned int nBytes) {
 147   size_t res;
 148   RESTARTABLE((size_t) ::write(fd, buf, (size_t) nBytes), res);
 149   return res;
 150 }
 151 
 152 inline int os::close(int fd) {
 153   return ::close(fd);
 154 }
 155 
 156 inline int os::socket_close(int fd) {
 157   return ::close(fd);
 158 }
 159 
 160 inline int os::socket(int domain, int type, int protocol) {
 161   return ::socket(domain, type, protocol);
 162 }
 163 
 164 inline int os::recv(int fd, char* buf, size_t nBytes, uint flags) {
 165   RESTARTABLE_RETURN_INT(::recv(fd, buf, nBytes, flags));
 166 }
 167 
 168 inline int os::send(int fd, char* buf, size_t nBytes, uint flags) {
 169   RESTARTABLE_RETURN_INT(::send(fd, buf, nBytes, flags));
 170 }
 171 
 172 inline int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) {
 173   return os::send(fd, buf, nBytes, flags);
 174 }
 175 
 176 inline int os::timeout(int fd, long timeout) {
 177   julong prevtime,newtime;
 178   struct timeval t;
 179 
 180   gettimeofday(&t, NULL);
 181   prevtime = ((julong)t.tv_sec * 1000)  +  t.tv_usec / 1000;
 182 
 183   for(;;) {
 184     struct pollfd pfd;
 185 
 186     pfd.fd = fd;
 187     pfd.events = POLLIN | POLLERR;
 188 
 189     int res = ::poll(&pfd, 1, timeout);
 190 
 191     if (res == OS_ERR && errno == EINTR) {
 192 
 193       // On Linux any value < 0 means "forever"
 194 
 195       if(timeout >= 0) {
 196         gettimeofday(&t, NULL);
 197         newtime = ((julong)t.tv_sec * 1000)  +  t.tv_usec / 1000;
 198         timeout -= newtime - prevtime;
 199         if(timeout <= 0)
 200           return OS_OK;
 201         prevtime = newtime;
 202       }
 203     } else
 204       return res;
 205   }
 206 }
 207 
 208 inline int os::listen(int fd, int count) {
 209   return ::listen(fd, count);
 210 }
 211 
 212 inline int os::connect(int fd, struct sockaddr* him, socklen_t len) {
 213   RESTARTABLE_RETURN_INT(::connect(fd, him, len));
 214 }
 215 
 216 inline int os::accept(int fd, struct sockaddr* him, socklen_t* len) {
 217   // Linux doc says this can't return EINTR, unlike accept() on Solaris.
 218   // But see attachListener_linux.cpp, LinuxAttachListener::dequeue().
 219   return (int)::accept(fd, him, len);
 220 }
 221 
 222 inline int os::recvfrom(int fd, char* buf, size_t nBytes, uint flags,
 223                         sockaddr* from, socklen_t* fromlen) {
 224   RESTARTABLE_RETURN_INT((int)::recvfrom(fd, buf, nBytes, flags, from, fromlen));
 225 }
 226 
 227 inline int os::sendto(int fd, char* buf, size_t len, uint flags,
 228                       struct sockaddr* to, socklen_t tolen) {
 229   RESTARTABLE_RETURN_INT((int)::sendto(fd, buf, len, flags, to, tolen));
 230 }
 231 
 232 inline int os::socket_shutdown(int fd, int howto) {
 233   return ::shutdown(fd, howto);
 234 }
 235 
 236 inline int os::bind(int fd, struct sockaddr* him, socklen_t len) {
 237   return ::bind(fd, him, len);
 238 }
 239 
 240 inline int os::get_sock_name(int fd, struct sockaddr* him, socklen_t* len) {
 241   return ::getsockname(fd, him, len);
 242 }
 243 
 244 inline int os::get_host_name(char* name, int namelen) {
 245   return ::gethostname(name, namelen);
 246 }
 247 
 248 inline struct hostent* os::get_host_by_name(char* name) {
 249   return ::gethostbyname(name);
 250 }
 251 
 252 inline int os::get_sock_opt(int fd, int level, int optname,
 253                             char* optval, socklen_t* optlen) {
 254   return ::getsockopt(fd, level, optname, optval, optlen);
 255 }
 256 
 257 inline int os::set_sock_opt(int fd, int level, int optname,
 258                             const char* optval, socklen_t optlen) {
 259   return ::setsockopt(fd, level, optname, optval, optlen);
 260 }
 261 
 262 inline bool os::supports_monotonic_clock() {
 263   return Linux::_clock_gettime != NULL;
 264 }
 265 
 266 #endif // OS_LINUX_VM_OS_LINUX_INLINE_HPP