1 /*
2 * Copyright (c) 1999, 2016, 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-sensitive on windows only
38 inline int os::file_name_strcmp(const char* s1, const char* s2) {
39 return strcmp(s1, s2);
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 char* os::native_path(char *path) {
92 return path;
93 }
94
95 inline int os::ftruncate(int fd, jlong length) {
96 return ::ftruncate64(fd, length);
97 }
98
99 inline struct dirent* os::readdir(DIR* dirp, dirent *dbuf)
100 {
101 // readdir_r has been deprecated since glibc 2.24.
102 // See https://sourceware.org/bugzilla/show_bug.cgi?id=19056 for more details.
103 #pragma GCC diagnostic push
104 #pragma GCC diagnostic ignored "-Wdeprecated-declarations"
105
106 dirent* p;
107 int status;
108 assert(dirp != NULL, "just checking");
109
110 // NOTE: Linux readdir_r (on RH 6.2 and 7.2 at least) is NOT like the POSIX
111 // version. Here is the doc for this function:
112 // http://www.gnu.org/manual/glibc-2.2.3/html_node/libc_262.html
113
114 if((status = ::readdir_r(dirp, dbuf, &p)) != 0) {
115 errno = status;
116 return NULL;
117 } else
118 return p;
119
120 #pragma GCC diagnostic pop
121 }
122
123 inline int os::closedir(DIR *dirp) {
124 assert(dirp != NULL, "argument is NULL");
125 return ::closedir(dirp);
126 }
127
128 // macros for restartable system calls
129
130 #define RESTARTABLE(_cmd, _result) do { \
131 _result = _cmd; \
132 } while(((int)_result == OS_ERR) && (errno == EINTR))
133
134 #define RESTARTABLE_RETURN_INT(_cmd) do { \
135 int _result; \
136 RESTARTABLE(_cmd, _result); \
137 return _result; \
138 } while(false)
139
140 inline bool os::numa_has_static_binding() { return true; }
141 inline bool os::numa_has_group_homing() { return false; }
142
143 inline size_t os::restartable_read(int fd, void *buf, unsigned int nBytes) {
144 size_t res;
145 RESTARTABLE( (size_t) ::read(fd, buf, (size_t) nBytes), res);
146 return res;
147 }
148
149 inline size_t os::write(int fd, const void *buf, unsigned int nBytes) {
150 size_t res;
151 RESTARTABLE((size_t) ::write(fd, buf, (size_t) nBytes), res);
152 return res;
153 }
154
155 inline int os::close(int fd) {
156 return ::close(fd);
157 }
158
159 inline int os::socket_close(int fd) {
160 return ::close(fd);
161 }
162
163 inline int os::socket(int domain, int type, int protocol) {
164 return ::socket(domain, type, protocol);
165 }
166
167 inline int os::recv(int fd, char* buf, size_t nBytes, uint flags) {
168 RESTARTABLE_RETURN_INT(::recv(fd, buf, nBytes, flags));
169 }
170
171 inline int os::send(int fd, char* buf, size_t nBytes, uint flags) {
172 RESTARTABLE_RETURN_INT(::send(fd, buf, nBytes, flags));
173 }
174
175 inline int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) {
176 return os::send(fd, buf, nBytes, flags);
177 }
178
179 inline int os::connect(int fd, struct sockaddr* him, socklen_t len) {
180 RESTARTABLE_RETURN_INT(::connect(fd, him, len));
181 }
182
183 inline struct hostent* os::get_host_by_name(char* name) {
184 return ::gethostbyname(name);
185 }
186
187 inline bool os::supports_monotonic_clock() {
188 return Linux::_clock_gettime != NULL;
189 }
190
191 inline void os::exit(int num) {
192 ::exit(num);
193 }
194
195 #endif // OS_LINUX_VM_OS_LINUX_INLINE_HPP
--- EOF ---