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_BSD_VM_OS_BSD_INLINE_HPP
26 #define OS_BSD_VM_OS_BSD_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 #ifdef __APPLE__
38
39 #include <stdlib.h>
40
41 inline int os::file_name_strncmp(const char* s1, const char* s2, size_t num) {
42 // Fast path, most of the time the file paths are the same
43 int result = strncmp(s1, s2, num);
44 if (result != 0) {
45 // Slow path, we will have to access the filesystem
46 // to resolve both paths, and then compare them
47 char resolved1[PATH_MAX] = {'\0'};
48 realpath(s1, resolved1);
49 char path2[PATH_MAX] = {'\0'};
50 strncpy(path2, s2, num);
51 char resolved2[PATH_MAX] = {'\0'};
52 realpath(path2, resolved2);
53 result = strcmp(resolved1, resolved2);
54 }
55 return result;
56 }
57
58 #else
59
60 inline int os::file_name_strncmp(const char* s1, const char* s2, size_t num) {
61 return strncmp(s1, s2, num);
62 }
63
64 #endif // __APPLE__
65
66 inline bool os::obsolete_option(const JavaVMOption *option) {
67 return false;
68 }
69
70 inline bool os::uses_stack_guard_pages() {
71 return true;
72 }
73
74 inline bool os::must_commit_stack_guard_pages() {
75 assert(uses_stack_guard_pages(), "sanity check");
76 #if !defined(__FreeBSD__) || __FreeBSD__ < 5
77 // Since FreeBSD 4 uses malloc() for allocating the thread stack
78 // there is no need to do anything extra to allocate the guard pages
79 return false;
80 #else
81 // FreeBSD 5+ uses mmap MAP_STACK for allocating the thread stacks.
82 // Must 'allocate' them or guard pages are ignored.
83 return true;
84 #endif
85 }
86
87
88 // On Bsd, reservations are made on a page by page basis, nothing to do.
89 inline void os::pd_split_reserved_memory(char *base, size_t size,
90 size_t split, bool realloc) {
91 }
92
93
94 // Bang the shadow pages if they need to be touched to be mapped.
95 inline void os::map_stack_shadow_pages(address sp) {
96 }
97
98 inline void os::dll_unload(void *lib) {
99 ::dlclose(lib);
100 }
101
102 inline const int os::default_file_open_flags() { return 0;}
103
104 inline jlong os::lseek(int fd, jlong offset, int whence) {
105 return (jlong) ::lseek(fd, offset, whence);
106 }
107
108 inline int os::fsync(int fd) {
109 return ::fsync(fd);
110 }
111
112 inline int os::ftruncate(int fd, jlong length) {
113 return ::ftruncate(fd, length);
114 }
115
116 // macros for restartable system calls
117
118 #define RESTARTABLE(_cmd, _result) do { \
119 _result = _cmd; \
120 } while(((int)_result == OS_ERR) && (errno == EINTR))
121
122 #define RESTARTABLE_RETURN_INT(_cmd) do { \
123 int _result; \
124 RESTARTABLE(_cmd, _result); \
125 return _result; \
126 } while(false)
127
128 inline bool os::numa_has_static_binding() { return true; }
129 inline bool os::numa_has_group_homing() { return false; }
130
131 inline size_t os::restartable_read(int fd, void *buf, unsigned int nBytes) {
132 size_t res;
133 RESTARTABLE( (size_t) ::read(fd, buf, (size_t) nBytes), res);
134 return res;
135 }
136
137 inline size_t os::write(int fd, const void *buf, unsigned int nBytes) {
138 size_t res;
139 RESTARTABLE((size_t) ::write(fd, buf, (size_t) nBytes), res);
140 return res;
141 }
142
143 inline int os::close(int fd) {
144 return ::close(fd);
145 }
146
147 inline int os::socket_close(int fd) {
148 return ::close(fd);
149 }
150
151 inline int os::socket(int domain, int type, int protocol) {
152 return ::socket(domain, type, protocol);
153 }
154
155 inline int os::recv(int fd, char* buf, size_t nBytes, uint flags) {
156 RESTARTABLE_RETURN_INT(::recv(fd, buf, nBytes, flags));
157 }
158
159 inline int os::send(int fd, char* buf, size_t nBytes, uint flags) {
160 RESTARTABLE_RETURN_INT(::send(fd, buf, nBytes, flags));
161 }
162
163 inline int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) {
164 return os::send(fd, buf, nBytes, flags);
165 }
166
167 inline int os::connect(int fd, struct sockaddr* him, socklen_t len) {
168 RESTARTABLE_RETURN_INT(::connect(fd, him, len));
169 }
170
171 inline struct hostent* os::get_host_by_name(char* name) {
172 return ::gethostbyname(name);
173 }
174
175 inline bool os::supports_monotonic_clock() {
176 #ifdef __APPLE__
177 return true;
178 #else
179 return Bsd::_clock_gettime != NULL;
180 #endif
181 }
182
183 inline void os::exit(int num) {
184 ::exit(num);
185 }
186
187 #endif // OS_BSD_VM_OS_BSD_INLINE_HPP