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::uses_stack_guard_pages() {
43 return true;
44 }
45
46 inline bool os::must_commit_stack_guard_pages() {
47 assert(uses_stack_guard_pages(), "sanity check");
48 return true;
49 }
50
51
52 // On Linux, reservations are made on a page by page basis, nothing to do.
53 inline void os::pd_split_reserved_memory(char *base, size_t size,
54 size_t split, bool realloc) {
55 }
56
57
58 // Bang the shadow pages if they need to be touched to be mapped.
59 inline void os::map_stack_shadow_pages(address sp) {
60 }
61
62 inline void os::dll_unload(void *lib) {
63 ::dlclose(lib);
64 }
65
66 inline const int os::default_file_open_flags() { return 0;}
67
68 inline jlong os::lseek(int fd, jlong offset, int whence) {
69 return (jlong) ::lseek64(fd, offset, whence);
70 }
71
72 inline int os::fsync(int fd) {
73 return ::fsync(fd);
74 }
75
76 inline int os::ftruncate(int fd, jlong length) {
77 return ::ftruncate64(fd, length);
78 }
79
80 // macros for restartable system calls
81
82 #define RESTARTABLE(_cmd, _result) do { \
83 _result = _cmd; \
84 } while(((int)_result == OS_ERR) && (errno == EINTR))
85
86 #define RESTARTABLE_RETURN_INT(_cmd) do { \
87 int _result; \
88 RESTARTABLE(_cmd, _result); \
89 return _result; \
90 } while(false)
91
92 inline bool os::numa_has_static_binding() { return true; }
93 inline bool os::numa_has_group_homing() { return false; }
94
95 inline size_t os::restartable_read(int fd, void *buf, unsigned int nBytes) {
96 size_t res;
97 RESTARTABLE( (size_t) ::read(fd, buf, (size_t) nBytes), res);
98 return res;
99 }
100
101 inline size_t os::write(int fd, const void *buf, unsigned int nBytes) {
102 size_t res;
103 RESTARTABLE((size_t) ::write(fd, buf, (size_t) nBytes), res);
104 return res;
105 }
106
107 inline int os::close(int fd) {
108 return ::close(fd);
109 }
110
111 inline int os::socket_close(int fd) {
112 return ::close(fd);
113 }
114
115 inline int os::socket(int domain, int type, int protocol) {
116 return ::socket(domain, type, protocol);
117 }
118
119 inline int os::recv(int fd, char* buf, size_t nBytes, uint flags) {
120 RESTARTABLE_RETURN_INT(::recv(fd, buf, nBytes, flags));
121 }
122
123 inline int os::send(int fd, char* buf, size_t nBytes, uint flags) {
124 RESTARTABLE_RETURN_INT(::send(fd, buf, nBytes, flags));
125 }
126
127 inline int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) {
128 return os::send(fd, buf, nBytes, flags);
129 }
130
131 inline int os::connect(int fd, struct sockaddr* him, socklen_t len) {
132 RESTARTABLE_RETURN_INT(::connect(fd, him, len));
133 }
134
135 inline struct hostent* os::get_host_by_name(char* name) {
136 return ::gethostbyname(name);
137 }
138
139 inline bool os::supports_monotonic_clock() {
140 return os::Posix::supports_monotonic_clock();
141 }
142
143 inline void os::exit(int num) {
144 ::exit(num);
145 }
146
147 #endif // OS_LINUX_VM_OS_LINUX_INLINE_HPP