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