os_linux.inline.hpp revision 4802:f2110083203d 
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/os.hpp"
30
31#ifdef TARGET_OS_ARCH_linux_x86
32# include "orderAccess_linux_x86.inline.hpp"
33#endif
34#ifdef TARGET_OS_ARCH_linux_sparc
35# include "orderAccess_linux_sparc.inline.hpp"
36#endif
37#ifdef TARGET_OS_ARCH_linux_zero
38# include "orderAccess_linux_zero.inline.hpp"
39#endif
40#ifdef TARGET_OS_ARCH_linux_arm
41# include "orderAccess_linux_arm.inline.hpp"
42#endif
43#ifdef TARGET_OS_ARCH_linux_ppc
44# include "orderAccess_linux_ppc.inline.hpp"
45#endif
46
47// System includes
48
49#include <unistd.h>
50#include <sys/socket.h>
51#include <sys/poll.h>
52#include <netdb.h>
53
54inline void* os::thread_local_storage_at(int index) {
55  return pthread_getspecific((pthread_key_t)index);
56}
57
58inline const char* os::file_separator() {
59  return "/";
60}
61
62inline const char* os::line_separator() {
63  return "\n";
64}
65
66inline const char* os::path_separator() {
67  return ":";
68}
69
70// File names are case-sensitive on windows only
71inline int os::file_name_strcmp(const char* s1, const char* s2) {
72  return strcmp(s1, s2);
73}
74
75inline bool os::obsolete_option(const JavaVMOption *option) {
76  return false;
77}
78
79inline bool os::uses_stack_guard_pages() {
80  return true;
81}
82
83inline bool os::allocate_stack_guard_pages() {
84  assert(uses_stack_guard_pages(), "sanity check");
85  return true;
86}
87
88
89// On Linux, reservations are made on a page by page basis, nothing to do.
90inline void os::pd_split_reserved_memory(char *base, size_t size,
91                                      size_t split, bool realloc) {
92}
93
94
95// Bang the shadow pages if they need to be touched to be mapped.
96inline void os::bang_stack_shadow_pages() {
97}
98
99inline void os::dll_unload(void *lib) {
100  ::dlclose(lib);
101}
102
103inline const int os::default_file_open_flags() { return 0;}
104
105inline DIR* os::opendir(const char* dirname)
106{
107  assert(dirname != NULL, "just checking");
108  return ::opendir(dirname);
109}
110
111inline int os::readdir_buf_size(const char *path)
112{
113  return NAME_MAX + sizeof(dirent) + 1;
114}
115
116inline jlong os::lseek(int fd, jlong offset, int whence) {
117  return (jlong) ::lseek64(fd, offset, whence);
118}
119
120inline int os::fsync(int fd) {
121  return ::fsync(fd);
122}
123
124inline char* os::native_path(char *path) {
125  return path;
126}
127
128inline int os::ftruncate(int fd, jlong length) {
129  return ::ftruncate64(fd, length);
130}
131
132inline struct dirent* os::readdir(DIR* dirp, dirent *dbuf)
133{
134  dirent* p;
135  int status;
136  assert(dirp != NULL, "just checking");
137
138  // NOTE: Linux readdir_r (on RH 6.2 and 7.2 at least) is NOT like the POSIX
139  // version. Here is the doc for this function:
140  // http://www.gnu.org/manual/glibc-2.2.3/html_node/libc_262.html
141
142  if((status = ::readdir_r(dirp, dbuf, &p)) != 0) {
143    errno = status;
144    return NULL;
145  } else
146    return p;
147}
148
149inline int os::closedir(DIR *dirp) {
150  assert(dirp != NULL, "argument is NULL");
151  return ::closedir(dirp);
152}
153
154// macros for restartable system calls
155
156#define RESTARTABLE(_cmd, _result) do { \
157    _result = _cmd; \
158  } while(((int)_result == OS_ERR) && (errno == EINTR))
159
160#define RESTARTABLE_RETURN_INT(_cmd) do { \
161  int _result; \
162  RESTARTABLE(_cmd, _result); \
163  return _result; \
164} while(false)
165
166inline bool os::numa_has_static_binding()   { return true; }
167inline bool os::numa_has_group_homing()     { return false;  }
168
169inline size_t os::restartable_read(int fd, void *buf, unsigned int nBytes) {
170  size_t res;
171  RESTARTABLE( (size_t) ::read(fd, buf, (size_t) nBytes), res);
172  return res;
173}
174
175inline size_t os::write(int fd, const void *buf, unsigned int nBytes) {
176  size_t res;
177  RESTARTABLE((size_t) ::write(fd, buf, (size_t) nBytes), res);
178  return res;
179}
180
181inline int os::close(int fd) {
182  return ::close(fd);
183}
184
185inline int os::socket_close(int fd) {
186  return ::close(fd);
187}
188
189inline int os::socket(int domain, int type, int protocol) {
190  return ::socket(domain, type, protocol);
191}
192
193inline int os::recv(int fd, char* buf, size_t nBytes, uint flags) {
194  RESTARTABLE_RETURN_INT(::recv(fd, buf, nBytes, flags));
195}
196
197inline int os::send(int fd, char* buf, size_t nBytes, uint flags) {
198  RESTARTABLE_RETURN_INT(::send(fd, buf, nBytes, flags));
199}
200
201inline int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) {
202  return os::send(fd, buf, nBytes, flags);
203}
204
205inline int os::timeout(int fd, long timeout) {
206  julong prevtime,newtime;
207  struct timeval t;
208
209  gettimeofday(&t, NULL);
210  prevtime = ((julong)t.tv_sec * 1000)  +  t.tv_usec / 1000;
211
212  for(;;) {
213    struct pollfd pfd;
214
215    pfd.fd = fd;
216    pfd.events = POLLIN | POLLERR;
217
218    int res = ::poll(&pfd, 1, timeout);
219
220    if (res == OS_ERR && errno == EINTR) {
221
222      // On Linux any value < 0 means "forever"
223
224      if(timeout >= 0) {
225        gettimeofday(&t, NULL);
226        newtime = ((julong)t.tv_sec * 1000)  +  t.tv_usec / 1000;
227        timeout -= newtime - prevtime;
228        if(timeout <= 0)
229          return OS_OK;
230        prevtime = newtime;
231      }
232    } else
233      return res;
234  }
235}
236
237inline int os::listen(int fd, int count) {
238  return ::listen(fd, count);
239}
240
241inline int os::connect(int fd, struct sockaddr* him, socklen_t len) {
242  RESTARTABLE_RETURN_INT(::connect(fd, him, len));
243}
244
245inline int os::accept(int fd, struct sockaddr* him, socklen_t* len) {
246  // Linux doc says this can't return EINTR, unlike accept() on Solaris.
247  // But see attachListener_linux.cpp, LinuxAttachListener::dequeue().
248  return (int)::accept(fd, him, len);
249}
250
251inline int os::recvfrom(int fd, char* buf, size_t nBytes, uint flags,
252                        sockaddr* from, socklen_t* fromlen) {
253  RESTARTABLE_RETURN_INT((int)::recvfrom(fd, buf, nBytes, flags, from, fromlen));
254}
255
256inline int os::sendto(int fd, char* buf, size_t len, uint flags,
257                      struct sockaddr* to, socklen_t tolen) {
258  RESTARTABLE_RETURN_INT((int)::sendto(fd, buf, len, flags, to, tolen));
259}
260
261inline int os::socket_shutdown(int fd, int howto) {
262  return ::shutdown(fd, howto);
263}
264
265inline int os::bind(int fd, struct sockaddr* him, socklen_t len) {
266  return ::bind(fd, him, len);
267}
268
269inline int os::get_sock_name(int fd, struct sockaddr* him, socklen_t* len) {
270  return ::getsockname(fd, him, len);
271}
272
273inline int os::get_host_name(char* name, int namelen) {
274  return ::gethostname(name, namelen);
275}
276
277inline struct hostent* os::get_host_by_name(char* name) {
278  return ::gethostbyname(name);
279}
280
281inline int os::get_sock_opt(int fd, int level, int optname,
282                            char* optval, socklen_t* optlen) {
283  return ::getsockopt(fd, level, optname, optval, optlen);
284}
285
286inline int os::set_sock_opt(int fd, int level, int optname,
287                            const char* optval, socklen_t optlen) {
288  return ::setsockopt(fd, level, optname, optval, optlen);
289}
290
291#endif // OS_LINUX_VM_OS_LINUX_INLINE_HPP
292