/*

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 *

 */

#include "runtime/os.hpp"

// System includes

#include <unistd.h>

#include <sys/socket.h>

#include <poll.h>

#include <netdb.h>

// File names are case-insensitive on windows only

inline int os::file_name_strncmp(const char* s1, const char* s2, size_t num) {

  return strncmp(s1, s2, num);

}

inline bool os::uses_stack_guard_pages() {

  return true;

}

inline bool os::must_commit_stack_guard_pages() {

  assert(uses_stack_guard_pages(), "sanity check");

#if !defined(__FreeBSD__) || __FreeBSD__ < 5

  // Since FreeBSD 4 uses malloc() for allocating the thread stack

  // there is no need to do anything extra to allocate the guard pages

  return false;

#else

  // FreeBSD 5+ uses mmap MAP_STACK for allocating the thread stacks.

  // Must 'allocate' them or guard pages are ignored.

  return true;

#endif

}

// On Bsd, reservations are made on a page by page basis, nothing to do.

inline void os::pd_split_reserved_memory(char *base, size_t size,

                                      size_t split, bool realloc) {

}

// Bang the shadow pages if they need to be touched to be mapped.

inline void os::map_stack_shadow_pages(address sp) {

}

inline void os::dll_unload(void *lib) {

  ::dlclose(lib);

}

inline const int os::default_file_open_flags() { return 0;}

inline jlong os::lseek(int fd, jlong offset, int whence) {

  return (jlong) ::lseek(fd, offset, whence);

}

inline int os::fsync(int fd) {

  return ::fsync(fd);

}

inline int os::ftruncate(int fd, jlong length) {

  return ::ftruncate(fd, length);

}

// macros for restartable system calls

#define RESTARTABLE(_cmd, _result) do { \

    _result = _cmd; \

  } while(((int)_result == OS_ERR) && (errno == EINTR))

#define RESTARTABLE_RETURN_INT(_cmd) do { \

  int _result; \

  RESTARTABLE(_cmd, _result); \

  return _result; \

} while(false)

inline bool os::numa_has_static_binding()   { return true; }

inline bool os::numa_has_group_homing()     { return false;  }

inline size_t os::restartable_read(int fd, void *buf, unsigned int nBytes) {

  size_t res;

  RESTARTABLE( (size_t) ::read(fd, buf, (size_t) nBytes), res);

  return res;

}

inline size_t os::write(int fd, const void *buf, unsigned int nBytes) {

  size_t res;

  RESTARTABLE((size_t) ::write(fd, buf, (size_t) nBytes), res);

  return res;

}

inline int os::close(int fd) {

  return ::close(fd);

}

inline int os::socket_close(int fd) {

  return ::close(fd);

}

inline int os::socket(int domain, int type, int protocol) {

  return ::socket(domain, type, protocol);

}

inline int os::recv(int fd, char* buf, size_t nBytes, uint flags) {

  RESTARTABLE_RETURN_INT(::recv(fd, buf, nBytes, flags));

}

inline int os::send(int fd, char* buf, size_t nBytes, uint flags) {

  RESTARTABLE_RETURN_INT(::send(fd, buf, nBytes, flags));

}

inline int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) {

  return os::send(fd, buf, nBytes, flags);

}

inline int os::connect(int fd, struct sockaddr* him, socklen_t len) {

  RESTARTABLE_RETURN_INT(::connect(fd, him, len));

}

inline struct hostent* os::get_host_by_name(char* name) {

  return ::gethostbyname(name);

}

inline bool os::supports_monotonic_clock() {

#ifdef __APPLE__

  return true;

#else

  return Bsd::_clock_gettime != NULL;

#endif

}

inline void os::exit(int num) {

  ::exit(num);

}