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.hpp"
29 #include "runtime/atomic.inline.hpp"
30 #include "runtime/os.hpp"
31
32 #ifdef TARGET_OS_ARCH_linux_x86
33 # include "orderAccess_linux_x86.inline.hpp"
34 #endif
35 #ifdef TARGET_OS_ARCH_linux_sparc
36 # include "orderAccess_linux_sparc.inline.hpp"
37 #endif
38 #ifdef TARGET_OS_ARCH_linux_zero
39 # include "orderAccess_linux_zero.inline.hpp"
40 #endif
41 #ifdef TARGET_OS_ARCH_linux_arm
42 # include "orderAccess_linux_arm.inline.hpp"
43 #endif
44 #ifdef TARGET_OS_ARCH_linux_ppc
45 # include "orderAccess_linux_ppc.inline.hpp"
46 #endif
47
48 // System includes
49
50 #include <unistd.h>
51 #include <sys/socket.h>
52 #include <sys/poll.h>
53 #include <netdb.h>
54
55 inline void* os::thread_local_storage_at(int index) {
56 return pthread_getspecific((pthread_key_t)index);
57 }
58
59 inline const char* os::file_separator() {
60 return "/";
61 }
62
63 inline const char* os::line_separator() {
64 return "\n";
65 }
66
67 inline const char* os::path_separator() {
68 return ":";
69 }
70
71 // File names are case-sensitive on windows only
72 inline int os::file_name_strcmp(const char* s1, const char* s2) {
73 return strcmp(s1, s2);
74 }
75
76 inline bool os::obsolete_option(const JavaVMOption *option) {
77 return false;
78 }
79
80 inline bool os::uses_stack_guard_pages() {
81 return true;
82 }
83
84 inline bool os::allocate_stack_guard_pages() {
85 assert(uses_stack_guard_pages(), "sanity check");
86 return true;
87 }
88
89
90 // On Linux, reservations are made on a page by page basis, nothing to do.
91 inline void os::pd_split_reserved_memory(char *base, size_t size,
92 size_t split, bool realloc) {
93 }
94
95
96 // Bang the shadow pages if they need to be touched to be mapped.
97 inline void os::bang_stack_shadow_pages() {
98 }
99
100 inline void os::dll_unload(void *lib) {
101 ::dlclose(lib);
102 }
103
104 inline const int os::default_file_open_flags() { return 0;}
105
106 inline DIR* os::opendir(const char* dirname)
107 {
108 assert(dirname != NULL, "just checking");
109 return ::opendir(dirname);
110 }
111
112 inline int os::readdir_buf_size(const char *path)
113 {
114 return NAME_MAX + sizeof(dirent) + 1;
115 }
116
117 inline jlong os::lseek(int fd, jlong offset, int whence) {
118 return (jlong) ::lseek64(fd, offset, whence);
119 }
120
121 inline int os::fsync(int fd) {
122 return ::fsync(fd);
123 }
124
125 inline char* os::native_path(char *path) {
126 return path;
127 }
128
129 inline int os::ftruncate(int fd, jlong length) {
130 return ::ftruncate64(fd, length);
131 }
132
133 inline struct dirent* os::readdir(DIR* dirp, dirent *dbuf)
134 {
135 dirent* p;
136 int status;
137 assert(dirp != NULL, "just checking");
138
139 // NOTE: Linux readdir_r (on RH 6.2 and 7.2 at least) is NOT like the POSIX
140 // version. Here is the doc for this function:
141 // http://www.gnu.org/manual/glibc-2.2.3/html_node/libc_262.html
142
143 if((status = ::readdir_r(dirp, dbuf, &p)) != 0) {
144 errno = status;
145 return NULL;
146 } else
147 return p;
148 }
149
150 inline int os::closedir(DIR *dirp) {
151 assert(dirp != NULL, "argument is NULL");
152 return ::closedir(dirp);
153 }
154
155 // macros for restartable system calls
156
157 #define RESTARTABLE(_cmd, _result) do { \
158 _result = _cmd; \
159 } while(((int)_result == OS_ERR) && (errno == EINTR))
160
161 #define RESTARTABLE_RETURN_INT(_cmd) do { \
162 int _result; \
163 RESTARTABLE(_cmd, _result); \
164 return _result; \
165 } while(false)
166
167 inline bool os::numa_has_static_binding() { return true; }
168 inline bool os::numa_has_group_homing() { return false; }
169
170 inline size_t os::restartable_read(int fd, void *buf, unsigned int nBytes) {
171 size_t res;
172 RESTARTABLE( (size_t) ::read(fd, buf, (size_t) nBytes), res);
173 return res;
174 }
175
176 inline size_t os::write(int fd, const void *buf, unsigned int nBytes) {
177 size_t res;
178 RESTARTABLE((size_t) ::write(fd, buf, (size_t) nBytes), res);
179 return res;
180 }
181
182 inline int os::close(int fd) {
183 return ::close(fd);
184 }
185
186 inline int os::socket_close(int fd) {
187 return ::close(fd);
188 }
189
190 inline int os::socket(int domain, int type, int protocol) {
191 return ::socket(domain, type, protocol);
192 }
193
194 inline int os::recv(int fd, char* buf, size_t nBytes, uint flags) {
195 RESTARTABLE_RETURN_INT(::recv(fd, buf, nBytes, flags));
196 }
197
198 inline int os::send(int fd, char* buf, size_t nBytes, uint flags) {
199 RESTARTABLE_RETURN_INT(::send(fd, buf, nBytes, flags));
200 }
201
202 inline int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) {
203 return os::send(fd, buf, nBytes, flags);
204 }
205
206 inline int os::timeout(int fd, long timeout) {
207 julong prevtime,newtime;
208 struct timeval t;
209
210 gettimeofday(&t, NULL);
211 prevtime = ((julong)t.tv_sec * 1000) + t.tv_usec / 1000;
212
213 for(;;) {
214 struct pollfd pfd;
215
216 pfd.fd = fd;
217 pfd.events = POLLIN | POLLERR;
218
219 int res = ::poll(&pfd, 1, timeout);
220
221 if (res == OS_ERR && errno == EINTR) {
222
223 // On Linux any value < 0 means "forever"
224
225 if(timeout >= 0) {
226 gettimeofday(&t, NULL);
227 newtime = ((julong)t.tv_sec * 1000) + t.tv_usec / 1000;
228 timeout -= newtime - prevtime;
229 if(timeout <= 0)
230 return OS_OK;
231 prevtime = newtime;
232 }
233 } else
234 return res;
235 }
236 }
237
238 inline int os::listen(int fd, int count) {
239 return ::listen(fd, count);
240 }
241
242 inline int os::connect(int fd, struct sockaddr* him, socklen_t len) {
243 RESTARTABLE_RETURN_INT(::connect(fd, him, len));
244 }
245
246 inline int os::accept(int fd, struct sockaddr* him, socklen_t* len) {
247 // Linux doc says this can't return EINTR, unlike accept() on Solaris.
248 // But see attachListener_linux.cpp, LinuxAttachListener::dequeue().
249 return (int)::accept(fd, him, len);
250 }
251
252 inline int os::recvfrom(int fd, char* buf, size_t nBytes, uint flags,
253 sockaddr* from, socklen_t* fromlen) {
254 RESTARTABLE_RETURN_INT((int)::recvfrom(fd, buf, nBytes, flags, from, fromlen));
255 }
256
257 inline int os::sendto(int fd, char* buf, size_t len, uint flags,
258 struct sockaddr* to, socklen_t tolen) {
259 RESTARTABLE_RETURN_INT((int)::sendto(fd, buf, len, flags, to, tolen));
260 }
261
262 inline int os::socket_shutdown(int fd, int howto) {
263 return ::shutdown(fd, howto);
264 }
265
266 inline int os::bind(int fd, struct sockaddr* him, socklen_t len) {
267 return ::bind(fd, him, len);
268 }
269
270 inline int os::get_sock_name(int fd, struct sockaddr* him, socklen_t* len) {
271 return ::getsockname(fd, him, len);
272 }
273
274 inline int os::get_host_name(char* name, int namelen) {
275 return ::gethostname(name, namelen);
276 }
277
278 inline struct hostent* os::get_host_by_name(char* name) {
279 return ::gethostbyname(name);
280 }
281
282 inline int os::get_sock_opt(int fd, int level, int optname,
283 char* optval, socklen_t* optlen) {
284 return ::getsockopt(fd, level, optname, optval, optlen);
285 }
286
287 inline int os::set_sock_opt(int fd, int level, int optname,
288 const char* optval, socklen_t optlen) {
289 return ::setsockopt(fd, level, optname, optval, optlen);
290 }
291 #endif // OS_LINUX_VM_OS_LINUX_INLINE_HPP