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diff --git a/nsprpub/pr/include/md/_openbsd.h b/nsprpub/pr/include/md/_openbsd.h
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+++ b/nsprpub/pr/include/md/_openbsd.h
@@ -0,0 +1,213 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef nspr_openbsd_defs_h___
+#define nspr_openbsd_defs_h___
+
+#include <sys/syscall.h>
+
+#define PR_LINKER_ARCH "openbsd"
+#define _PR_SI_SYSNAME "OPENBSD"
+#if defined(__i386__)
+#define _PR_SI_ARCHITECTURE "x86"
+#elif defined(__alpha__)
+#define _PR_SI_ARCHITECTURE "alpha"
+#elif defined(__amd64__)
+#define _PR_SI_ARCHITECTURE "amd64"
+#elif defined(__powerpc64__)
+#define _PR_SI_ARCHITECTURE "powerpc64"
+#elif defined(__powerpc__)
+#define _PR_SI_ARCHITECTURE "powerpc"
+#elif defined(__aarch64__)
+#define _PR_SI_ARCHITECTURE "aarch64"
+#elif defined(__sparc__)
+#define _PR_SI_ARCHITECTURE "sparc"
+#elif defined(__arm__)
+#define _PR_SI_ARCHITECTURE "arm"
+#endif
+
+#define PR_DLL_SUFFIX ".so"
+
+#define _PR_VMBASE 0x30000000
+#define _PR_STACK_VMBASE 0x50000000
+#define _MD_DEFAULT_STACK_SIZE 65536L
+#define _MD_MMAP_FLAGS MAP_PRIVATE
+
+#undef HAVE_STACK_GROWING_UP
+#define HAVE_DLL
+#define USE_DLFCN
+#define _PR_HAVE_SOCKADDR_LEN
+#define _PR_HAVE_LARGE_OFF_T
+#define _PR_STAT_HAS_ST_ATIMESPEC
+#define _PR_POLL_AVAILABLE
+#define _PR_USE_POLL
+#define _PR_HAVE_SYSV_SEMAPHORES
+#define PR_HAVE_SYSV_NAMED_SHARED_MEMORY
+
+#define _PR_INET6
+#define _PR_HAVE_INET_NTOP
+#define _PR_HAVE_GETHOSTBYNAME2
+#define _PR_HAVE_GETADDRINFO
+#define _PR_INET6_PROBE
+
+#define USE_SETJMP
+
+#ifndef _PR_PTHREADS
+#include <setjmp.h>
+
+#define PR_CONTEXT_TYPE sigjmp_buf
+
+#define CONTEXT(_th) ((_th)->md.context)
+
+#if defined(__i386__) || defined(__sparc__) || defined(__m68k__)
+#define JB_SP_INDEX 2
+#elif defined(__powerpc__)
+#define JB_SP_INDEX 1
+#elif defined(__alpha__)
+#define JB_SP_INDEX 34
+#elif defined(__amd64__)
+#define JB_SP_INDEX 6
+#elif defined(__arm__)
+#define JB_SP_INDEX 23
+#else
+#error "Need to define SP index in jmp_buf here"
+#endif
+#define _MD_GET_SP(_th) (_th)->md.context[JB_SP_INDEX]
+
+#define PR_NUM_GCREGS _JBLEN
+
+/*
+** Initialize a thread context to run "_main()" when started
+*/
+#define _MD_INIT_CONTEXT(_thread, _sp, _main, status) \
+{ \
+ *status = PR_TRUE; \
+ if (sigsetjmp(CONTEXT(_thread), 1)) { \
+ _main(); \
+ } \
+ _MD_GET_SP(_thread) = (unsigned char*) ((_sp) - 64); \
+}
+
+#define _MD_SWITCH_CONTEXT(_thread) \
+ if (!sigsetjmp(CONTEXT(_thread), 1)) { \
+ (_thread)->md.errcode = errno; \
+ _PR_Schedule(); \
+ }
+
+/*
+** Restore a thread context, saved by _MD_SWITCH_CONTEXT
+*/
+#define _MD_RESTORE_CONTEXT(_thread) \
+{ \
+ errno = (_thread)->md.errcode; \
+ _MD_SET_CURRENT_THREAD(_thread); \
+ siglongjmp(CONTEXT(_thread), 1); \
+}
+
+/* Machine-dependent (MD) data structures */
+
+struct _MDThread {
+ PR_CONTEXT_TYPE context;
+ int id;
+ int errcode;
+};
+
+struct _MDThreadStack {
+ PRInt8 notused;
+};
+
+struct _MDLock {
+ PRInt8 notused;
+};
+
+struct _MDSemaphore {
+ PRInt8 notused;
+};
+
+struct _MDCVar {
+ PRInt8 notused;
+};
+
+struct _MDSegment {
+ PRInt8 notused;
+};
+
+/*
+ * md-specific cpu structure field
+ */
+#define _PR_MD_MAX_OSFD FD_SETSIZE
+
+struct _MDCPU_Unix {
+ PRCList ioQ;
+ PRUint32 ioq_timeout;
+ PRInt32 ioq_max_osfd;
+ PRInt32 ioq_osfd_cnt;
+#ifndef _PR_USE_POLL
+ fd_set fd_read_set, fd_write_set, fd_exception_set;
+ PRInt16 fd_read_cnt[_PR_MD_MAX_OSFD],fd_write_cnt[_PR_MD_MAX_OSFD],
+ fd_exception_cnt[_PR_MD_MAX_OSFD];
+#else
+ struct pollfd *ioq_pollfds;
+ int ioq_pollfds_size;
+#endif /* _PR_USE_POLL */
+};
+
+#define _PR_IOQ(_cpu) ((_cpu)->md.md_unix.ioQ)
+#define _PR_ADD_TO_IOQ(_pq, _cpu) PR_APPEND_LINK(&_pq.links, &_PR_IOQ(_cpu))
+#define _PR_FD_READ_SET(_cpu) ((_cpu)->md.md_unix.fd_read_set)
+#define _PR_FD_READ_CNT(_cpu) ((_cpu)->md.md_unix.fd_read_cnt)
+#define _PR_FD_WRITE_SET(_cpu) ((_cpu)->md.md_unix.fd_write_set)
+#define _PR_FD_WRITE_CNT(_cpu) ((_cpu)->md.md_unix.fd_write_cnt)
+#define _PR_FD_EXCEPTION_SET(_cpu) ((_cpu)->md.md_unix.fd_exception_set)
+#define _PR_FD_EXCEPTION_CNT(_cpu) ((_cpu)->md.md_unix.fd_exception_cnt)
+#define _PR_IOQ_TIMEOUT(_cpu) ((_cpu)->md.md_unix.ioq_timeout)
+#define _PR_IOQ_MAX_OSFD(_cpu) ((_cpu)->md.md_unix.ioq_max_osfd)
+#define _PR_IOQ_OSFD_CNT(_cpu) ((_cpu)->md.md_unix.ioq_osfd_cnt)
+#define _PR_IOQ_POLLFDS(_cpu) ((_cpu)->md.md_unix.ioq_pollfds)
+#define _PR_IOQ_POLLFDS_SIZE(_cpu) ((_cpu)->md.md_unix.ioq_pollfds_size)
+
+#define _PR_IOQ_MIN_POLLFDS_SIZE(_cpu) 32
+
+struct _MDCPU {
+ struct _MDCPU_Unix md_unix;
+};
+
+#define _MD_INIT_LOCKS()
+#define _MD_NEW_LOCK(lock) PR_SUCCESS
+#define _MD_FREE_LOCK(lock)
+#define _MD_LOCK(lock)
+#define _MD_UNLOCK(lock)
+#define _MD_INIT_IO()
+#define _MD_IOQ_LOCK()
+#define _MD_IOQ_UNLOCK()
+
+#define _MD_INIT_RUNNING_CPU(cpu) _MD_unix_init_running_cpu(cpu)
+#define _MD_INIT_THREAD _MD_InitializeThread
+#define _MD_EXIT_THREAD(thread)
+#define _MD_SUSPEND_THREAD(thread) _MD_suspend_thread
+#define _MD_RESUME_THREAD(thread) _MD_resume_thread
+#define _MD_CLEAN_THREAD(_thread)
+
+#endif /* ! _PR_PTHREADS */
+
+extern void _MD_EarlyInit(void);
+
+#define _MD_EARLY_INIT _MD_EarlyInit
+#define _MD_FINAL_INIT _PR_UnixInit
+#define _PR_HAVE_CLOCK_MONOTONIC
+
+/*
+ * We wrapped the select() call. _MD_SELECT refers to the built-in,
+ * unwrapped version.
+ */
+#define _MD_SELECT(nfds,r,w,e,tv) syscall(SYS_select,nfds,r,w,e,tv)
+#include <poll.h>
+#define _MD_POLL(fds,nfds,timeout) syscall(SYS_poll,fds,nfds,timeout)
+
+#if OpenBSD1_3 == 1L
+typedef unsigned int nfds_t;
+#endif
+
+#endif /* nspr_openbsd_defs_h___ */