1 /*
   2  * Copyright (c) 1999, 2013, 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/atomic.inline.hpp"
  29 #include "runtime/os.hpp"
  30 
  31 #ifdef TARGET_OS_ARCH_linux_x86
  32 # include "orderAccess_linux_x86.inline.hpp"
  33 #endif
  34 #ifdef TARGET_OS_ARCH_linux_sparc
  35 # include "orderAccess_linux_sparc.inline.hpp"
  36 #endif
  37 #ifdef TARGET_OS_ARCH_linux_zero
  38 # include "orderAccess_linux_zero.inline.hpp"
  39 #endif
  40 #ifdef TARGET_OS_ARCH_linux_arm
  41 # include "orderAccess_linux_arm.inline.hpp"
  42 #endif
  43 #ifdef TARGET_OS_ARCH_linux_ppc
  44 # include "orderAccess_linux_ppc.inline.hpp"
  45 #endif
  46 
  47 // System includes
  48 
  49 #include <unistd.h>
  50 #include <sys/socket.h>
  51 #include <sys/poll.h>
  52 #include <netdb.h>
  53 
  54 inline void* os::thread_local_storage_at(int index) {
  55   return pthread_getspecific((pthread_key_t)index);
  56 }
  57 
  58 inline const char* os::file_separator() {
  59   return "/";
  60 }
  61 
  62 inline const char* os::line_separator() {
  63   return "\n";
  64 }
  65 
  66 inline const char* os::path_separator() {
  67   return ":";
  68 }
  69 
  70 // File names are case-sensitive on windows only
  71 inline int os::file_name_strcmp(const char* s1, const char* s2) {
  72   return strcmp(s1, s2);
  73 }
  74 
  75 inline bool os::obsolete_option(const JavaVMOption *option) {
  76   return false;
  77 }
  78 
  79 inline bool os::uses_stack_guard_pages() {
  80   return true;
  81 }
  82 
  83 inline bool os::allocate_stack_guard_pages() {
  84   assert(uses_stack_guard_pages(), "sanity check");
  85   return true;
  86 }
  87 
  88 
  89 // On Linux, reservations are made on a page by page basis, nothing to do.
  90 inline void os::pd_split_reserved_memory(char *base, size_t size,
  91                                       size_t split, bool realloc) {
  92 }
  93 
  94 
  95 // Bang the shadow pages if they need to be touched to be mapped.
  96 inline void os::bang_stack_shadow_pages() {
  97 }
  98 
  99 inline void os::dll_unload(void *lib) {
 100   ::dlclose(lib);
 101 }
 102 
 103 inline const int os::default_file_open_flags() { return 0;}
 104 
 105 inline DIR* os::opendir(const char* dirname)
 106 {
 107   assert(dirname != NULL, "just checking");
 108   return ::opendir(dirname);
 109 }
 110 
 111 inline int os::readdir_buf_size(const char *path)
 112 {
 113   return NAME_MAX + sizeof(dirent) + 1;
 114 }
 115 
 116 inline jlong os::lseek(int fd, jlong offset, int whence) {
 117   return (jlong) ::lseek64(fd, offset, whence);
 118 }
 119 
 120 inline int os::fsync(int fd) {
 121   return ::fsync(fd);
 122 }
 123 
 124 inline char* os::native_path(char *path) {
 125   return path;
 126 }
 127 
 128 inline int os::ftruncate(int fd, jlong length) {
 129   return ::ftruncate64(fd, length);
 130 }
 131 
 132 inline struct dirent* os::readdir(DIR* dirp, dirent *dbuf)
 133 {
 134   dirent* p;
 135   int status;
 136   assert(dirp != NULL, "just checking");
 137 
 138   // NOTE: Linux readdir_r (on RH 6.2 and 7.2 at least) is NOT like the POSIX
 139   // version. Here is the doc for this function:
 140   // http://www.gnu.org/manual/glibc-2.2.3/html_node/libc_262.html
 141 
 142   if((status = ::readdir_r(dirp, dbuf, &p)) != 0) {
 143     errno = status;
 144     return NULL;
 145   } else
 146     return p;
 147 }
 148 
 149 inline int os::closedir(DIR *dirp) {
 150   assert(dirp != NULL, "argument is NULL");
 151   return ::closedir(dirp);
 152 }
 153 
 154 // macros for restartable system calls
 155 
 156 #define RESTARTABLE(_cmd, _result) do { \
 157     _result = _cmd; \
 158   } while(((int)_result == OS_ERR) && (errno == EINTR))
 159 
 160 #define RESTARTABLE_RETURN_INT(_cmd) do { \
 161   int _result; \
 162   RESTARTABLE(_cmd, _result); \
 163   return _result; \
 164 } while(false)
 165 
 166 inline bool os::numa_has_static_binding()   { return true; }
 167 inline bool os::numa_has_group_homing()     { return false;  }
 168 
 169 inline size_t os::restartable_read(int fd, void *buf, unsigned int nBytes) {
 170   size_t res;
 171   RESTARTABLE( (size_t) ::read(fd, buf, (size_t) nBytes), res);
 172   return res;
 173 }
 174 
 175 inline size_t os::write(int fd, const void *buf, unsigned int nBytes) {
 176   size_t res;
 177   RESTARTABLE((size_t) ::write(fd, buf, (size_t) nBytes), res);
 178   return res;
 179 }
 180 
 181 inline int os::close(int fd) {
 182   return ::close(fd);
 183 }
 184 
 185 inline int os::socket_close(int fd) {
 186   return ::close(fd);
 187 }
 188 
 189 inline int os::socket(int domain, int type, int protocol) {
 190   return ::socket(domain, type, protocol);
 191 }
 192 
 193 inline int os::recv(int fd, char* buf, size_t nBytes, uint flags) {
 194   RESTARTABLE_RETURN_INT(::recv(fd, buf, nBytes, flags));
 195 }
 196 
 197 inline int os::send(int fd, char* buf, size_t nBytes, uint flags) {
 198   RESTARTABLE_RETURN_INT(::send(fd, buf, nBytes, flags));
 199 }
 200 
 201 inline int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) {
 202   return os::send(fd, buf, nBytes, flags);
 203 }
 204 
 205 inline int os::timeout(int fd, long timeout) {
 206   julong prevtime,newtime;
 207   struct timeval t;
 208 
 209   gettimeofday(&t, NULL);
 210   prevtime = ((julong)t.tv_sec * 1000)  +  t.tv_usec / 1000;
 211 
 212   for(;;) {
 213     struct pollfd pfd;
 214 
 215     pfd.fd = fd;
 216     pfd.events = POLLIN | POLLERR;
 217 
 218     int res = ::poll(&pfd, 1, timeout);
 219 
 220     if (res == OS_ERR && errno == EINTR) {
 221 
 222       // On Linux any value < 0 means "forever"
 223 
 224       if(timeout >= 0) {
 225         gettimeofday(&t, NULL);
 226         newtime = ((julong)t.tv_sec * 1000)  +  t.tv_usec / 1000;
 227         timeout -= newtime - prevtime;
 228         if(timeout <= 0)
 229           return OS_OK;
 230         prevtime = newtime;
 231       }
 232     } else
 233       return res;
 234   }
 235 }
 236 
 237 inline int os::listen(int fd, int count) {
 238   return ::listen(fd, count);
 239 }
 240 
 241 inline int os::connect(int fd, struct sockaddr* him, socklen_t len) {
 242   RESTARTABLE_RETURN_INT(::connect(fd, him, len));
 243 }
 244 
 245 inline int os::accept(int fd, struct sockaddr* him, socklen_t* len) {
 246   // Linux doc says this can't return EINTR, unlike accept() on Solaris.
 247   // But see attachListener_linux.cpp, LinuxAttachListener::dequeue().
 248   return (int)::accept(fd, him, len);
 249 }
 250 
 251 inline int os::recvfrom(int fd, char* buf, size_t nBytes, uint flags,
 252                         sockaddr* from, socklen_t* fromlen) {
 253   RESTARTABLE_RETURN_INT((int)::recvfrom(fd, buf, nBytes, flags, from, fromlen));
 254 }
 255 
 256 inline int os::sendto(int fd, char* buf, size_t len, uint flags,
 257                       struct sockaddr* to, socklen_t tolen) {
 258   RESTARTABLE_RETURN_INT((int)::sendto(fd, buf, len, flags, to, tolen));
 259 }
 260 
 261 inline int os::socket_shutdown(int fd, int howto) {
 262   return ::shutdown(fd, howto);
 263 }
 264 
 265 inline int os::bind(int fd, struct sockaddr* him, socklen_t len) {
 266   return ::bind(fd, him, len);
 267 }
 268 
 269 inline int os::get_sock_name(int fd, struct sockaddr* him, socklen_t* len) {
 270   return ::getsockname(fd, him, len);
 271 }
 272 
 273 inline int os::get_host_name(char* name, int namelen) {
 274   return ::gethostname(name, namelen);
 275 }
 276 
 277 inline struct hostent* os::get_host_by_name(char* name) {
 278   return ::gethostbyname(name);
 279 }
 280 
 281 inline int os::get_sock_opt(int fd, int level, int optname,
 282                             char* optval, socklen_t* optlen) {
 283   return ::getsockopt(fd, level, optname, optval, optlen);
 284 }
 285 
 286 inline int os::set_sock_opt(int fd, int level, int optname,
 287                             const char* optval, socklen_t optlen) {
 288   return ::setsockopt(fd, level, optname, optval, optlen);
 289 }
 290 
 291 #endif // OS_LINUX_VM_OS_LINUX_INLINE_HPP