1 /* 2 * Copyright (c) 1999, 2015, 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 // File names are case-sensitive on windows only 38 inline int os::file_name_strcmp(const char* s1, const char* s2) { 39 return strcmp(s1, s2); 40 } 41 42 inline bool os::obsolete_option(const JavaVMOption *option) { 43 return false; 44 } 45 46 inline bool os::uses_stack_guard_pages() { 47 return true; 48 } 49 50 inline bool os::allocate_stack_guard_pages() { 51 assert(uses_stack_guard_pages(), "sanity check"); 52 return true; 53 } 54 55 56 // On Linux, reservations are made on a page by page basis, nothing to do. 57 inline void os::pd_split_reserved_memory(char *base, size_t size, 58 size_t split, bool realloc) { 59 } 60 61 62 // Bang the shadow pages if they need to be touched to be mapped. 63 inline void os::map_stack_shadow_pages() { 64 } 65 66 inline void os::dll_unload(void *lib) { 67 ::dlclose(lib); 68 } 69 70 inline const int os::default_file_open_flags() { return 0;} 71 72 inline DIR* os::opendir(const char* dirname) 73 { 74 assert(dirname != NULL, "just checking"); 75 return ::opendir(dirname); 76 } 77 78 inline int os::readdir_buf_size(const char *path) 79 { 80 return NAME_MAX + sizeof(dirent) + 1; 81 } 82 83 inline jlong os::lseek(int fd, jlong offset, int whence) { 84 return (jlong) ::lseek64(fd, offset, whence); 85 } 86 87 inline int os::fsync(int fd) { 88 return ::fsync(fd); 89 } 90 91 inline char* os::native_path(char *path) { 92 return path; 93 } 94 95 inline int os::ftruncate(int fd, jlong length) { 96 return ::ftruncate64(fd, length); 97 } 98 99 inline struct dirent* os::readdir(DIR* dirp, dirent *dbuf) 100 { 101 dirent* p; 102 int status; 103 assert(dirp != NULL, "just checking"); 104 105 // NOTE: Linux readdir_r (on RH 6.2 and 7.2 at least) is NOT like the POSIX 106 // version. Here is the doc for this function: 107 // http://www.gnu.org/manual/glibc-2.2.3/html_node/libc_262.html 108 109 if((status = ::readdir_r(dirp, dbuf, &p)) != 0) { 110 errno = status; 111 return NULL; 112 } else 113 return p; 114 } 115 116 inline int os::closedir(DIR *dirp) { 117 assert(dirp != NULL, "argument is NULL"); 118 return ::closedir(dirp); 119 } 120 121 // macros for restartable system calls 122 123 #define RESTARTABLE(_cmd, _result) do { \ 124 _result = _cmd; \ 125 } while(((int)_result == OS_ERR) && (errno == EINTR)) 126 127 #define RESTARTABLE_RETURN_INT(_cmd) do { \ 128 int _result; \ 129 RESTARTABLE(_cmd, _result); \ 130 return _result; \ 131 } while(false) 132 133 inline bool os::numa_has_static_binding() { return true; } 134 inline bool os::numa_has_group_homing() { return false; } 135 136 inline size_t os::restartable_read(int fd, void *buf, unsigned int nBytes) { 137 size_t res; 138 RESTARTABLE( (size_t) ::read(fd, buf, (size_t) nBytes), res); 139 return res; 140 } 141 142 inline size_t os::write(int fd, const void *buf, unsigned int nBytes) { 143 size_t res; 144 RESTARTABLE((size_t) ::write(fd, buf, (size_t) nBytes), res); 145 return res; 146 } 147 148 inline int os::close(int fd) { 149 return ::close(fd); 150 } 151 152 inline int os::socket_close(int fd) { 153 return ::close(fd); 154 } 155 156 inline int os::socket(int domain, int type, int protocol) { 157 return ::socket(domain, type, protocol); 158 } 159 160 inline int os::recv(int fd, char* buf, size_t nBytes, uint flags) { 161 RESTARTABLE_RETURN_INT(::recv(fd, buf, nBytes, flags)); 162 } 163 164 inline int os::send(int fd, char* buf, size_t nBytes, uint flags) { 165 RESTARTABLE_RETURN_INT(::send(fd, buf, nBytes, flags)); 166 } 167 168 inline int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) { 169 return os::send(fd, buf, nBytes, flags); 170 } 171 172 inline int os::connect(int fd, struct sockaddr* him, socklen_t len) { 173 RESTARTABLE_RETURN_INT(::connect(fd, him, len)); 174 } 175 176 inline struct hostent* os::get_host_by_name(char* name) { 177 return ::gethostbyname(name); 178 } 179 180 inline bool os::supports_monotonic_clock() { 181 return Linux::_clock_gettime != NULL; 182 } 183 184 inline void os::exit(int num) { 185 ::exit(num); 186 } 187 188 #endif // OS_LINUX_VM_OS_LINUX_INLINE_HPP