1 /*
2 * Copyright (c) 1999, 2018, 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-insensitive on windows only
38 inline int os::file_name_strncmp(const char* s1, const char* s2, size_t num) {
39 return strncmp(s1, s2, num);
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 int os::ftruncate(int fd, jlong length) {
92 return ::ftruncate64(fd, length);
93 }
94
95 inline struct dirent* os::readdir(DIR* dirp, dirent *dbuf)
96 {
97 assert(dirp != NULL, "just checking");
98 return ::readdir(dirp);
99 }
100
101 inline int os::closedir(DIR *dirp) {
102 assert(dirp != NULL, "argument is NULL");
103 return ::closedir(dirp);
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::connect(int fd, struct sockaddr* him, socklen_t len) {
158 RESTARTABLE_RETURN_INT(::connect(fd, him, len));
159 }
160
161 inline struct hostent* os::get_host_by_name(char* name) {
162 return ::gethostbyname(name);
163 }
164
165 inline bool os::supports_monotonic_clock() {
166 return Linux::_clock_gettime != NULL;
167 }
168
169 inline void os::exit(int num) {
170 ::exit(num);
171 }
172
173 #endif // OS_LINUX_VM_OS_LINUX_INLINE_HPP