1 /*
   2  * Copyright (c) 1999, 2015, Oracle and/or its affiliates. All rights reserved.
   3  * Copyright 2012, 2015 SAP AG. All rights reserved.
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This code is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License version 2 only, as
   8  * published by the Free Software Foundation.
   9  *
  10  * This code is distributed in the hope that it will be useful, but WITHOUT
  11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  13  * version 2 for more details (a copy is included in the LICENSE file that
  14  * accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License version
  17  * 2 along with this work; if not, write to the Free Software Foundation,
  18  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  19  *
  20  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  21  * or visit www.oracle.com if you need additional information or have any
  22  * questions.
  23  *
  24  */
  25 
  26 #ifndef OS_AIX_VM_OS_AIX_INLINE_HPP
  27 #define OS_AIX_VM_OS_AIX_INLINE_HPP
  28 
  29 #include "runtime/os.hpp"
  30 
  31 // System includes
  32 
  33 #include <unistd.h>
  34 #include <sys/socket.h>
  35 #include <sys/poll.h>
  36 #include <sys/ioctl.h>
  37 #include <netdb.h>
  38 
  39 // File names are case-sensitive on windows only.
  40 inline int os::file_name_strcmp(const char* s1, const char* s2) {
  41   return strcmp(s1, s2);
  42 }
  43 
  44 inline bool os::obsolete_option(const JavaVMOption *option) {
  45   return false;
  46 }
  47 
  48 inline bool os::uses_stack_guard_pages() {
  49   return true;
  50 }
  51 
  52 // Whether or not calling code should/can commit/uncommit stack pages
  53 // before guarding them. Answer for AIX is definitly no, because memory
  54 // is automatically committed on touch.
  55 inline bool os::allocate_stack_guard_pages() {
  56   assert(uses_stack_guard_pages(), "sanity check");
  57   return false;
  58 }
  59 
  60 // On Aix, reservations are made on a page by page basis, nothing to do.
  61 inline void os::pd_split_reserved_memory(char *base, size_t size,
  62                                          size_t split, bool realloc) {
  63 }
  64 
  65 // Bang the shadow pages if they need to be touched to be mapped.
  66 inline void os::bang_stack_shadow_pages() {
  67 }
  68 
  69 inline void os::dll_unload(void *lib) {
  70   ::dlclose(lib);
  71 }
  72 
  73 inline const int os::default_file_open_flags() { return 0;}
  74 
  75 inline DIR* os::opendir(const char* dirname) {
  76   assert(dirname != NULL, "just checking");
  77   return ::opendir(dirname);
  78 }
  79 
  80 inline int os::readdir_buf_size(const char *path) {
  81   // According to aix sys/limits, NAME_MAX must be retrieved at runtime.
  82   const long my_NAME_MAX = pathconf(path, _PC_NAME_MAX);
  83   return my_NAME_MAX + sizeof(dirent) + 1;
  84 }
  85 
  86 inline jlong os::lseek(int fd, jlong offset, int whence) {
  87   return (jlong) ::lseek64(fd, offset, whence);
  88 }
  89 
  90 inline int os::fsync(int fd) {
  91   return ::fsync(fd);
  92 }
  93 
  94 inline char* os::native_path(char *path) {
  95   return path;
  96 }
  97 
  98 inline int os::ftruncate(int fd, jlong length) {
  99   return ::ftruncate64(fd, length);
 100 }
 101 
 102 inline struct dirent* os::readdir(DIR* dirp, dirent *dbuf) {
 103   dirent* p;
 104   int status;
 105   assert(dirp != NULL, "just checking");
 106 
 107   // NOTE: Linux readdir_r (on RH 6.2 and 7.2 at least) is NOT like the POSIX
 108   // version. Here is the doc for this function:
 109   // http://www.gnu.org/manual/glibc-2.2.3/html_node/libc_262.html
 110 
 111   if((status = ::readdir_r(dirp, dbuf, &p)) != 0) {
 112     errno = status;
 113     return NULL;
 114   } else
 115     return p;
 116 }
 117 
 118 inline int os::closedir(DIR *dirp) {
 119   assert(dirp != NULL, "argument is NULL");
 120   return ::closedir(dirp);
 121 }
 122 
 123 // macros for restartable system calls
 124 
 125 #define RESTARTABLE(_cmd, _result) do { \
 126     _result = _cmd; \
 127   } while(((int)_result == OS_ERR) && (errno == EINTR))
 128 
 129 #define RESTARTABLE_RETURN_INT(_cmd) do { \
 130   int _result; \
 131   RESTARTABLE(_cmd, _result); \
 132   return _result; \
 133 } while(false)
 134 
 135 // We don't have NUMA support on Aix, but we need this for compilation.
 136 inline bool os::numa_has_static_binding()   { ShouldNotReachHere(); return true; }
 137 inline bool os::numa_has_group_homing()     { ShouldNotReachHere(); return false;  }
 138 
 139 inline size_t os::restartable_read(int fd, void *buf, unsigned int nBytes) {
 140   size_t res;
 141   RESTARTABLE( (size_t) ::read(fd, buf, (size_t) nBytes), res);
 142   return res;
 143 }
 144 
 145 inline size_t os::write(int fd, const void *buf, unsigned int nBytes) {
 146   size_t res;
 147   RESTARTABLE((size_t) ::write(fd, buf, (size_t) nBytes), res);
 148   return res;
 149 }
 150 
 151 inline int os::close(int fd) {
 152   return ::close(fd);
 153 }
 154 
 155 inline int os::socket_close(int fd) {
 156   return ::close(fd);
 157 }
 158 
 159 inline int os::socket(int domain, int type, int protocol) {
 160   return ::socket(domain, type, protocol);
 161 }
 162 
 163 inline int os::recv(int fd, char* buf, size_t nBytes, uint flags) {
 164   RESTARTABLE_RETURN_INT(::recv(fd, buf, nBytes, flags));
 165 }
 166 
 167 inline int os::send(int fd, char* buf, size_t nBytes, uint flags) {
 168   RESTARTABLE_RETURN_INT(::send(fd, buf, nBytes, flags));
 169 }
 170 
 171 inline int os::raw_send(int fd, char *buf, size_t nBytes, uint flags) {
 172   return os::send(fd, buf, nBytes, flags);
 173 }
 174 
 175 inline int os::connect(int fd, struct sockaddr *him, socklen_t len) {
 176   RESTARTABLE_RETURN_INT(::connect(fd, him, len));
 177 }
 178 
 179 inline struct hostent* os::get_host_by_name(char* name) {
 180   return ::gethostbyname(name);
 181 }
 182 
 183 inline bool os::supports_monotonic_clock() {
 184   // mread_real_time() is monotonic on AIX (see os::javaTimeNanos() comments)
 185   return true;
 186 }
 187 
 188 inline void os::exit(int num) {
 189   ::exit(num);
 190 }
 191 
 192 #endif // OS_AIX_VM_OS_AIX_INLINE_HPP