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 /*

  * Copyright (c) 1999, 2013, Oracle and/or its affiliates. All rights reserved.

  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

  *

  * This code is free software; you can redistribute it and/or modify it

  * under the terms of the GNU General Public License version 2 only, as

  * published by the Free Software Foundation.

  *

  * This code is distributed in the hope that it will be useful, but WITHOUT

  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

  * version 2 for more details (a copy is included in the LICENSE file that

  * accompanied this code).

  *

  * You should have received a copy of the GNU General Public License version

  * 2 along with this work; if not, write to the Free Software Foundation,

  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

  *

  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

  * or visit www.oracle.com if you need additional information or have any

  * questions.

  *

  */

 #ifndef OS_LINUX_VM_OS_LINUX_INLINE_HPP

 #define OS_LINUX_VM_OS_LINUX_INLINE_HPP

 #include "runtime/atomic.inline.hpp"

 #include "runtime/orderAccess.inline.hpp"

 #include "runtime/os.hpp"

 // System includes

 #include <unistd.h>

 #include <sys/socket.h>

 #include <sys/poll.h>

 #include <netdb.h>

 inline void* os::thread_local_storage_at(int index) {

   return pthread_getspecific((pthread_key_t)index);

 }

 inline const char* os::file_separator() {

   return "/";

 }

 inline const char* os::line_separator() {

   return "\n";

 }

 inline const char* os::path_separator() {

   return ":";

 }

 // File names are case-sensitive on windows only

 inline int os::file_name_strcmp(const char* s1, const char* s2) {

   return strcmp(s1, s2);

 }

 inline bool os::obsolete_option(const JavaVMOption *option) {

   return false;

 }

 inline bool os::uses_stack_guard_pages() {

   return true;

 }

 inline bool os::allocate_stack_guard_pages() {

   assert(uses_stack_guard_pages(), "sanity check");

   return true;

 }

 // On Linux, reservations are made on a page by page basis, nothing to do.

 inline void os::pd_split_reserved_memory(char *base, size_t size,

                                       size_t split, bool realloc) {

 }

 // Bang the shadow pages if they need to be touched to be mapped.

 inline void os::bang_stack_shadow_pages() {

 }

 inline void os::dll_unload(void *lib) {

   ::dlclose(lib);

 }

 inline const int os::default_file_open_flags() { return 0;}

 inline DIR* os::opendir(const char* dirname)

 {

   assert(dirname != NULL, "just checking");

   return ::opendir(dirname);

 }

 inline int os::readdir_buf_size(const char *path)

 {

   return NAME_MAX + sizeof(dirent) + 1;

 }

 inline jlong os::lseek(int fd, jlong offset, int whence) {

   return (jlong) ::lseek64(fd, offset, whence);

 }

 inline int os::fsync(int fd) {

   return ::fsync(fd);

 }

 inline char* os::native_path(char *path) {

   return path;

 }

 inline int os::ftruncate(int fd, jlong length) {

   return ::ftruncate64(fd, length);

 }

 inline struct dirent* os::readdir(DIR* dirp, dirent *dbuf)

 {

   dirent* p;

   int status;

   assert(dirp != NULL, "just checking");

   // NOTE: Linux readdir_r (on RH 6.2 and 7.2 at least) is NOT like the POSIX

   // version. Here is the doc for this function:

   // http://www.gnu.org/manual/glibc-2.2.3/html_node/libc_262.html

   if((status = ::readdir_r(dirp, dbuf, &p)) != 0) {

     errno = status;

     return NULL;

   } else

     return p;

 }

 inline int os::closedir(DIR *dirp) {

   assert(dirp != NULL, "argument is NULL");

   return ::closedir(dirp);

 }

 // macros for restartable system calls

 #define RESTARTABLE(_cmd, _result) do { \

     _result = _cmd; \

   } while(((int)_result == OS_ERR) && (errno == EINTR))

 #define RESTARTABLE_RETURN_INT(_cmd) do { \

   int _result; \

   RESTARTABLE(_cmd, _result); \

   return _result; \

 } while(false)

 inline bool os::numa_has_static_binding()   { return true; }

 inline bool os::numa_has_group_homing()     { return false;  }

 inline size_t os::restartable_read(int fd, void *buf, unsigned int nBytes) {

   size_t res;

   RESTARTABLE( (size_t) ::read(fd, buf, (size_t) nBytes), res);

   return res;

 }

 inline size_t os::write(int fd, const void *buf, unsigned int nBytes) {

   size_t res;

   RESTARTABLE((size_t) ::write(fd, buf, (size_t) nBytes), res);

   return res;

 }

 inline int os::close(int fd) {

   return ::close(fd);

 }

 inline int os::socket_close(int fd) {

   return ::close(fd);

 }

 inline int os::socket(int domain, int type, int protocol) {

   return ::socket(domain, type, protocol);

 }

 inline int os::recv(int fd, char* buf, size_t nBytes, uint flags) {

   RESTARTABLE_RETURN_INT(::recv(fd, buf, nBytes, flags));

 }

 inline int os::send(int fd, char* buf, size_t nBytes, uint flags) {

   RESTARTABLE_RETURN_INT(::send(fd, buf, nBytes, flags));

 }

 inline int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) {

   return os::send(fd, buf, nBytes, flags);

 }

 inline int os::timeout(int fd, long timeout) {

   julong prevtime,newtime;

   struct timeval t;

   gettimeofday(&t, NULL);

   prevtime = ((julong)t.tv_sec * 1000)  +  t.tv_usec / 1000;

   for(;;) {

     struct pollfd pfd;

     pfd.fd = fd;

     pfd.events = POLLIN | POLLERR;

     int res = ::poll(&pfd, 1, timeout);

     if (res == OS_ERR && errno == EINTR) {

       // On Linux any value < 0 means "forever"

       if(timeout >= 0) {

         gettimeofday(&t, NULL);

         newtime = ((julong)t.tv_sec * 1000)  +  t.tv_usec / 1000;

         timeout -= newtime - prevtime;

         if(timeout <= 0)

           return OS_OK;

         prevtime = newtime;

       }

     } else

       return res;

   }

 }

 inline int os::listen(int fd, int count) {

   return ::listen(fd, count);

 }

 inline int os::connect(int fd, struct sockaddr* him, socklen_t len) {

   RESTARTABLE_RETURN_INT(::connect(fd, him, len));

 }

 inline int os::accept(int fd, struct sockaddr* him, socklen_t* len) {

   // Linux doc says this can't return EINTR, unlike accept() on Solaris.

   // But see attachListener_linux.cpp, LinuxAttachListener::dequeue().

   return (int)::accept(fd, him, len);

 }

 inline int os::recvfrom(int fd, char* buf, size_t nBytes, uint flags,

                         sockaddr* from, socklen_t* fromlen) {

   RESTARTABLE_RETURN_INT((int)::recvfrom(fd, buf, nBytes, flags, from, fromlen));

 }

 inline int os::sendto(int fd, char* buf, size_t len, uint flags,

                       struct sockaddr* to, socklen_t tolen) {

   RESTARTABLE_RETURN_INT((int)::sendto(fd, buf, len, flags, to, tolen));

 }

 inline int os::socket_shutdown(int fd, int howto) {

   return ::shutdown(fd, howto);

 }

 inline int os::bind(int fd, struct sockaddr* him, socklen_t len) {

   return ::bind(fd, him, len);

 }

 inline int os::get_sock_name(int fd, struct sockaddr* him, socklen_t* len) {

   return ::getsockname(fd, him, len);

 }

 inline int os::get_host_name(char* name, int namelen) {

   return ::gethostname(name, namelen);

 }

 inline struct hostent* os::get_host_by_name(char* name) {

   return ::gethostbyname(name);

 }

 inline int os::get_sock_opt(int fd, int level, int optname,

                             char* optval, socklen_t* optlen) {

   return ::getsockopt(fd, level, optname, optval, optlen);

 }

 inline int os::set_sock_opt(int fd, int level, int optname,

                             const char* optval, socklen_t optlen) {

   return ::setsockopt(fd, level, optname, optval, optlen);

 }

 #endif // OS_LINUX_VM_OS_LINUX_INLINE_HPP