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 jlong os::lseek(int fd, jlong offset, int whence) {
91 return (jlong) ::lseek64(fd, offset, whence);
92 }
93
94 inline int os::fsync(int fd) {
95 return ::fsync(fd);
96 }
97
98 inline char* os::native_path(char *path) {
99 return path;
100 }
101
102 inline int os::ftruncate(int fd, jlong length) {
103 return ::ftruncate64(fd, length);
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::timeout(int fd, long timeout) {
158 julong prevtime,newtime;
159 struct timeval t;
160
161 gettimeofday(&t, NULL);
162 prevtime = ((julong)t.tv_sec * 1000) + t.tv_usec / 1000;
163
164 for(;;) {
165 struct pollfd pfd;
166
167 pfd.fd = fd;
168 pfd.events = POLLIN | POLLERR;
169
170 int res = ::poll(&pfd, 1, timeout);
171
172 if (res == OS_ERR && errno == EINTR) {
173
174 // On Linux any value < 0 means "forever"
175
176 if(timeout >= 0) {
177 gettimeofday(&t, NULL);
178 newtime = ((julong)t.tv_sec * 1000) + t.tv_usec / 1000;
179 timeout -= newtime - prevtime;
180 if(timeout <= 0)
181 return OS_OK;
182 prevtime = newtime;
183 }
184 } else
185 return res;
186 }
187 }
188
189 inline int os::listen(int fd, int count) {
190 return ::listen(fd, count);
191 }
192
193 inline int os::connect(int fd, struct sockaddr* him, socklen_t len) {
194 RESTARTABLE_RETURN_INT(::connect(fd, him, len));
195 }
196
197 inline int os::accept(int fd, struct sockaddr* him, socklen_t* len) {
198 // Linux doc says this can't return EINTR, unlike accept() on Solaris.
199 // But see attachListener_linux.cpp, LinuxAttachListener::dequeue().
200 return (int)::accept(fd, him, len);
201 }
202
203 inline int os::recvfrom(int fd, char* buf, size_t nBytes, uint flags,
204 sockaddr* from, socklen_t* fromlen) {
205 RESTARTABLE_RETURN_INT((int)::recvfrom(fd, buf, nBytes, flags, from, fromlen));
206 }
207
208 inline int os::sendto(int fd, char* buf, size_t len, uint flags,
209 struct sockaddr* to, socklen_t tolen) {
210 RESTARTABLE_RETURN_INT((int)::sendto(fd, buf, len, flags, to, tolen));
211 }
212
213 inline int os::socket_shutdown(int fd, int howto) {
214 return ::shutdown(fd, howto);
215 }
216
217 inline int os::bind(int fd, struct sockaddr* him, socklen_t len) {
218 return ::bind(fd, him, len);
219 }
220
221 inline int os::get_sock_name(int fd, struct sockaddr* him, socklen_t* len) {
222 return ::getsockname(fd, him, len);
223 }
224
225 inline int os::get_host_name(char* name, int namelen) {
226 return ::gethostname(name, namelen);
227 }
228
229 inline struct hostent* os::get_host_by_name(char* name) {
230 return ::gethostbyname(name);
231 }
232
233 inline int os::get_sock_opt(int fd, int level, int optname,
234 char* optval, socklen_t* optlen) {
235 return ::getsockopt(fd, level, optname, optval, optlen);
236 }
237
238 inline int os::set_sock_opt(int fd, int level, int optname,
239 const char* optval, socklen_t optlen) {
240 return ::setsockopt(fd, level, optname, optval, optlen);
241 }
242
243 #endif // OS_LINUX_VM_OS_LINUX_INLINE_HPP