1 /* 2 * Copyright (c) 1999, 2018, 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 <poll.h> 35 #include <netdb.h> 36 37 // File names are case-insensitive on windows only 38 inline int os::file_name_strncmp(const char* s1, const char* s2, size_t num) { 39 return strncmp(s1, s2, num); 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::must_commit_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(address sp) { 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 int os::ftruncate(int fd, jlong length) { 92 return ::ftruncate64(fd, length); 93 } 94 95 inline struct dirent* os::readdir(DIR* dirp, dirent *dbuf) 96 { 97 assert(dirp != NULL, "just checking"); 98 return ::readdir(dirp); 99 } 100 101 inline int os::closedir(DIR *dirp) { 102 assert(dirp != NULL, "argument is NULL"); 103 return ::closedir(dirp); 104 } 105 106 // macros for restartable system calls 107 108 #define RESTARTABLE(_cmd, _result) do { \ 109 _result = _cmd; \ 110 } while(((int)_result == OS_ERR) && (errno == EINTR)) 111 112 #define RESTARTABLE_RETURN_INT(_cmd) do { \ 113 int _result; \ 114 RESTARTABLE(_cmd, _result); \ 115 return _result; \ 116 } while(false) 117 118 inline bool os::numa_has_static_binding() { return true; } 119 inline bool os::numa_has_group_homing() { return false; } 120 121 inline size_t os::restartable_read(int fd, void *buf, unsigned int nBytes) { 122 size_t res; 123 RESTARTABLE( (size_t) ::read(fd, buf, (size_t) nBytes), res); 124 return res; 125 } 126 127 inline size_t os::write(int fd, const void *buf, unsigned int nBytes) { 128 size_t res; 129 RESTARTABLE((size_t) ::write(fd, buf, (size_t) nBytes), res); 130 return res; 131 } 132 133 inline int os::close(int fd) { 134 return ::close(fd); 135 } 136 137 inline int os::socket_close(int fd) { 138 return ::close(fd); 139 } 140 141 inline int os::socket(int domain, int type, int protocol) { 142 return ::socket(domain, type, protocol); 143 } 144 145 inline int os::recv(int fd, char* buf, size_t nBytes, uint flags) { 146 RESTARTABLE_RETURN_INT(::recv(fd, buf, nBytes, flags)); 147 } 148 149 inline int os::send(int fd, char* buf, size_t nBytes, uint flags) { 150 RESTARTABLE_RETURN_INT(::send(fd, buf, nBytes, flags)); 151 } 152 153 inline int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) { 154 return os::send(fd, buf, nBytes, flags); 155 } 156 157 inline int os::connect(int fd, struct sockaddr* him, socklen_t len) { 158 RESTARTABLE_RETURN_INT(::connect(fd, him, len)); 159 } 160 161 inline struct hostent* os::get_host_by_name(char* name) { 162 return ::gethostbyname(name); 163 } 164 165 inline bool os::supports_monotonic_clock() { 166 return Linux::_clock_gettime != NULL; 167 } 168 169 inline void os::exit(int num) { 170 ::exit(num); 171 } 172 173 #endif // OS_LINUX_VM_OS_LINUX_INLINE_HPP