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