diff --git a/Include/osdefs.h b/Include/osdefs.h
index e4ac74e..f914919 100644
--- a/Include/osdefs.h
+++ b/Include/osdefs.h
@@ -44,7 +44,7 @@
 #define DELIM '\n'
 #endif
 
-#if defined(MS_WINDOWS) || defined(__BORLANDC__) || defined(__WATCOMC__) ||  defined(__DJGPP__)
+#if defined(MS_WINDOWS) || defined(__BORLANDC__) || defined(__WATCOMC__) || defined(__DJGPP__) || defined(__TOS_OS2__)
 #define SEP '\\'
 #define ALTSEP '/'
 #define MAXPATHLEN 256
diff --git a/Lib/os.py b/Lib/os.py
index 7f9e696..16d0af9 100644
--- a/Lib/os.py
+++ b/Lib/os.py
@@ -59,6 +59,18 @@
 	import dospath
 	path = dospath
 	del dospath
+elif 'os2' in _names:
+	name = 'os2'
+	curdir = '.'; pardir = '..'; sep = '\\'; pathsep = ';'
+	defpath = '.;C:\\bin'
+	from os2 import *
+	try:
+		from os2 import _exit
+	except ImportError:
+		pass
+	import ntpath
+	path = ntpath
+	del ntpath
 elif 'mac' in _names:
 	name = 'mac'
 	curdir = ':'; pardir = '::'; sep = ':'; pathsep = '\n'
diff --git a/Lib/test/test_select.py b/Lib/test/test_select.py
index 85bfa41..53185b1 100644
--- a/Lib/test/test_select.py
+++ b/Lib/test/test_select.py
@@ -35,7 +35,7 @@
 
 def test():
 	import sys
-	if sys.platform[:3] in ('win', 'mac'):
+	if sys.platform[:3] in ('win', 'mac', 'os2'):
 		if verbose:
 			print "Can't test select easily on", sys.platform
 		return
diff --git a/Lib/test/test_signal.py b/Lib/test/test_signal.py
index 51b120b..2d33635 100644
--- a/Lib/test/test_signal.py
+++ b/Lib/test/test_signal.py
@@ -4,9 +4,8 @@
 import os
 import sys
 
-if sys.platform[:3] == 'win':
-    raise ImportError, "Can't test signal on Windows"
-
+if sys.platform[:3] in ('win', 'os2'):
+    raise ImportError, "Can't test signal on %s" % sys.platform[:3]
 
 if verbose:
 	x = '-x'
diff --git a/Modules/posixmodule.c b/Modules/posixmodule.c
index 58111ef..8679e09 100644
--- a/Modules/posixmodule.c
+++ b/Modules/posixmodule.c
@@ -46,10 +46,16 @@
 disguised Unix interface).  Refer to the library manual and\n\
 corresponding Unix manual entries for more information on calls.";
 
-
-
 #include "Python.h"
 
+#if defined(PYOS_OS2)
+#define  INCL_DOS
+#define  INCL_DOSERRORS
+#define  INCL_DOSPROCESS
+#define  INCL_NOPMAPI
+#include <os2.h>
+#endif
+
 #include <sys/types.h>
 #include <sys/stat.h>
 #ifdef HAVE_SYS_WAIT_H
@@ -68,6 +74,24 @@
 
 /* Various compilers have only certain posix functions */
 /* XXX Gosh I wish these were all moved into config.h */
+#if defined(PYCC_VACPP) && defined(PYOS_OS2)
+  #define HAVE_EXECV      1
+  #define HAVE_GETCWD     1
+  #define HAVE_SYSTEM     1
+  #define HAVE_WAIT       1
+  #define HAVE_KILL       1
+  #define HAVE_PIPE       1
+  #define HAVE_POPEN      1
+
+// #define HAVE_FORK       1
+// #define HAVE_GETEGID    1
+// #define HAVE_GETEUID    1
+// #define HAVE_GETGID     1
+// #define HAVE_GETPPID    1
+// #define HAVE_GETUID     1
+// #define HAVE_OPENDIR    1
+#include <process.h>
+#else
 #ifdef __WATCOMC__		/* Watcom compiler */
 #define HAVE_GETCWD     1
 #define HAVE_OPENDIR    1
@@ -121,6 +145,7 @@
 #endif  /* _MSC_VER */
 #endif  /* __BORLANDC__ */
 #endif  /* ! __WATCOMC__ */
+#endif /* ! __IBMC__ */
 
 #ifndef _MSC_VER
 
@@ -143,13 +168,22 @@
 extern int lstat();
 extern int symlink();
 #else /* !HAVE_UNISTD_H */
+#if defined(PYCC_VACPP)
+extern int mkdir Py_PROTO((char *));
+#else
 #if defined(__WATCOMC__) || defined(_MSC_VER)
 extern int mkdir Py_PROTO((const char *));
 #else
 extern int mkdir Py_PROTO((const char *, mode_t));
 #endif
+#endif
+#if defined(__IBMC__) || defined(__IBMCPP__)
+extern int chdir Py_PROTO((char *));
+extern int rmdir Py_PROTO((char *));
+#else
 extern int chdir Py_PROTO((const char *));
 extern int rmdir Py_PROTO((const char *));
+#endif
 extern int chmod Py_PROTO((const char *, mode_t));
 extern int chown Py_PROTO((const char *, uid_t, gid_t));
 extern char *getcwd Py_PROTO((char *, int));
@@ -310,7 +344,7 @@
 	Py_BEGIN_ALLOW_THREADS
 	res = (*func)(path1, path2);
 	Py_END_ALLOW_THREADS
-	if (res < 0)
+	if (res != 0)
 		return posix_error();
 	Py_INCREF(Py_None);
 	return Py_None;
@@ -480,7 +514,7 @@
 	PyObject *self;
 	PyObject *args;
 {
-	/* XXX Should redo this putting the three versions of opendir
+	/* XXX Should redo this putting the (now four) versions of opendir
 	   in separate files instead of having them all here... */
 #if defined(MS_WIN32) && !defined(HAVE_OPENDIR)
 
@@ -601,6 +635,78 @@
 	return d;
 
 #else
+#if defined(PYOS_OS2)
+
+#ifndef MAX_PATH
+#define MAX_PATH    CCHMAXPATH
+#endif
+    char *name, *pt;
+    int len;
+    PyObject *d, *v;
+    char namebuf[MAX_PATH+5];
+    HDIR  hdir = 1;
+    ULONG srchcnt = 1;
+    FILEFINDBUF3   ep;
+    APIRET rc;
+
+	if (!PyArg_Parse(args, "s#", &name, &len))
+        return NULL;
+    if (len >= MAX_PATH) {
+		PyErr_SetString(PyExc_ValueError, "path too long");
+        return NULL;
+    }
+    strcpy(namebuf, name);
+    for (pt = namebuf; *pt; pt++)
+        if (*pt == '/')
+            *pt = '\\';
+    if (namebuf[len-1] != '\\')
+        namebuf[len++] = '\\';
+    strcpy(namebuf + len, "*.*");
+
+	if ((d = PyList_New(0)) == NULL)
+        return NULL;
+
+    rc = DosFindFirst(namebuf,         // Wildcard Pattern to Match
+                      &hdir,           // Handle to Use While Search Directory
+                      FILE_READONLY | FILE_HIDDEN | FILE_SYSTEM | FILE_DIRECTORY,
+                      &ep, sizeof(ep), // Structure to Receive Directory Entry
+                      &srchcnt,        // Max and Actual Count of Entries Per Iteration
+                      FIL_STANDARD);   // Format of Entry (EAs or Not)
+
+    if (rc != NO_ERROR) {
+        errno = ENOENT;
+        return posix_error();
+    }
+
+    if (srchcnt > 0) { // If Directory is NOT Totally Empty,
+        do {
+            if (ep.achName[0] == '.'
+            && (ep.achName[1] == '\0' || ep.achName[1] == '.' && ep.achName[2] == '\0'))
+                continue; // Skip Over "." and ".." Names
+
+            strcpy(namebuf, ep.achName);
+
+            // Leave Case of Name Alone -- In Native Form
+            // (Removed Forced Lowercasing Code)
+
+            v = PyString_FromString(namebuf);
+            if (v == NULL) {
+                Py_DECREF(d);
+                d = NULL;
+                break;
+            }
+            if (PyList_Append(d, v) != 0) {
+                Py_DECREF(v);
+                Py_DECREF(d);
+                d = NULL;
+                break;
+            }
+            Py_DECREF(v);
+        } while (DosFindNext(hdir, &ep, sizeof(ep), &srchcnt) == NO_ERROR && srchcnt > 0);
+    }
+
+    return d;
+#else
 
 	char *name;
 	PyObject *d, *v;
@@ -642,6 +748,7 @@
 
 	return d;
 
+#endif /* !PYOS_OS2 */
 #endif /* !_MSC_VER */
 #endif /* !MS_WIN32 */
 }
@@ -661,7 +768,7 @@
 	if (!PyArg_ParseTuple(args, "s|i", &path, &mode))
 		return NULL;
 	Py_BEGIN_ALLOW_THREADS
-#if defined(__WATCOMC__) || defined(_MSC_VER)
+#if defined(__WATCOMC__) || defined(_MSC_VER) || defined(PYCC_VACPP)
 	res = mkdir(path);
 #else
 	res = mkdir(path, mode);
@@ -1246,8 +1353,23 @@
 	int pid, sig;
 	if (!PyArg_Parse(args, "(ii)", &pid, &sig))
 		return NULL;
+#if defined(__TOS_OS2__)
+    if (sig == XCPT_SIGNAL_INTR || sig == XCPT_SIGNAL_BREAK) {
+        APIRET rc;
+        if ((rc = DosSendSignalException(pid, sig)) != NO_ERROR)
+            return posix_error();
+
+    } else if (sig == XCPT_SIGNAL_KILLPROC) {
+        APIRET rc;
+        if ((rc = DosKillProcess(DKP_PROCESS, pid)) != NO_ERROR)
+            return posix_error();
+
+    } else
+        return NULL; // Unrecognized Signal Requested
+#else
 	if (kill(pid, sig) == -1)
 		return posix_error();
+#endif
 	Py_INCREF(Py_None);
 	return Py_None;
 }
@@ -1284,6 +1406,108 @@
 "popen(command [, mode='r' [, bufsize]]) -> pipe\n\
 Open a pipe to/from a command returning a file object.";
 
+#if defined(PYOS_OS2)
+int
+async_system(const char *command)
+{
+    char        *p, errormsg[256], args[1024];
+    RESULTCODES  rcodes;
+    APIRET       rc;
+    char        *shell = getenv("COMSPEC");
+    if (!shell)
+        shell = "cmd";
+
+    strcpy(args, shell);
+    p = &args[ strlen(args)+1 ];
+    strcpy(p, "/c ");
+    strcat(p, command);
+    p += strlen(p) + 1;
+    *p = '\0';
+
+    rc = DosExecPgm(errormsg, sizeof(errormsg),
+                    EXEC_ASYNC, // Execute Async w/o Wait for Results
+                    args,
+                    NULL,       // Inherit Parent's Environment
+                    &rcodes, shell);
+    return rc;
+}
+
+FILE *
+popen(const char *command, const char *mode, int pipesize)
+{
+    HFILE    rhan, whan;
+    FILE    *retfd = NULL;
+    APIRET   rc = DosCreatePipe(&rhan, &whan, pipesize);
+
+    if (rc != NO_ERROR)
+        return NULL; // ERROR - Unable to Create Anon Pipe
+
+    if (strchr(mode, 'r') != NULL) { // Treat Command as a Data Source
+        int oldfd = dup(1);      // Save STDOUT Handle in Another Handle
+
+        DosEnterCritSec();       // Stop Other Threads While Changing Handles
+        close(1);                // Make STDOUT Available for Reallocation
+
+        if (dup2(whan, 1) == 0) {      // Connect STDOUT to Pipe Write Side
+            DosClose(whan);            // Close Now-Unused Pipe Write Handle
+
+            if (async_system(command) == NO_ERROR)
+                retfd = fdopen(rhan, "rb"); // And Return Pipe Read Handle
+        }
+
+        dup2(oldfd, 1);          // Reconnect STDOUT to Original Handle
+        DosExitCritSec();        // Now Allow Other Threads to Run
+
+        close(oldfd);            // And Close Saved STDOUT Handle
+        return retfd;            // Return fd of Pipe or NULL if Error
+
+    } else if (strchr(mode, 'w')) { // Treat Command as a Data Sink
+        int oldfd = dup(0);      // Save STDIN Handle in Another Handle
+
+        DosEnterCritSec();       // Stop Other Threads While Changing Handles
+        close(0);                // Make STDIN Available for Reallocation
+
+        if (dup2(rhan, 0) == 0)     { // Connect STDIN to Pipe Read Side
+            DosClose(rhan);           // Close Now-Unused Pipe Read Handle
+
+            if (async_system(command) == NO_ERROR)
+                retfd = fdopen(whan, "wb"); // And Return Pipe Write Handle
+        }
+
+        dup2(oldfd, 0);          // Reconnect STDIN to Original Handle
+        DosExitCritSec();        // Now Allow Other Threads to Run
+
+        close(oldfd);            // And Close Saved STDIN Handle
+        return retfd;            // Return fd of Pipe or NULL if Error
+
+    } else
+        return NULL; // ERROR - Invalid Mode (Neither Read nor Write)
+}
+
+static PyObject *
+posix_popen(self, args)
+	PyObject *self;
+	PyObject *args;
+{
+	char *name;
+	char *mode = "r";
+	int   bufsize = -1;
+	FILE *fp;
+	PyObject *f;
+	if (!PyArg_ParseTuple(args, "s|si", &name, &mode, &bufsize))
+		return NULL;
+	Py_BEGIN_ALLOW_THREADS
+	fp = popen(name, mode, (bufsize > 0) ? bufsize : 4096);
+	Py_END_ALLOW_THREADS
+	if (fp == NULL)
+		return posix_error();
+	f = PyFile_FromFile(fp, name, mode, fclose);
+	if (f != NULL)
+		PyFile_SetBufSize(f, bufsize);
+	return f;
+}
+
+#else
 static PyObject *
 posix_popen(self, args)
 	PyObject *self;
@@ -1306,6 +1530,8 @@
 		PyFile_SetBufSize(f, bufsize);
 	return f;
 }
+#endif
+
 #endif /* HAVE_POPEN */
 
 
@@ -1840,6 +2066,21 @@
 	PyObject *self;
 	PyObject *args;
 {
+#if defined(PYOS_OS2)
+    HFILE read, write;
+    APIRET rc;
+
+    if (!PyArg_Parse(args, ""))
+        return NULL;
+
+	Py_BEGIN_ALLOW_THREADS
+    rc = DosCreatePipe( &read, &write, 4096);
+	Py_END_ALLOW_THREADS
+    if (rc != NO_ERROR)
+        return posix_error();
+
+    return Py_BuildValue("(ii)", read, write);
+#else
 #if !defined(MS_WIN32)
 	int fds[2];
 	int res;
@@ -1863,6 +2104,7 @@
 		return posix_error();
 	return Py_BuildValue("(ii)", read, write);
 #endif /* MS_WIN32 */
+#endif
 }
 #endif  /* HAVE_PIPE */
 
@@ -2259,9 +2501,14 @@
 #define INITFUNC initnt
 #define MODNAME "nt"
 #else
+#if defined(PYOS_OS2)
+#define INITFUNC initos2
+#define MODNAME "os2"
+#else
 #define INITFUNC initposix
 #define MODNAME "posix"
 #endif
+#endif
 
 void
 INITFUNC()
diff --git a/Modules/selectmodule.c b/Modules/selectmodule.c
index 7655c3c..be0c604 100644
--- a/Modules/selectmodule.c
+++ b/Modules/selectmodule.c
@@ -48,6 +48,11 @@
 
 #include <sys/types.h>
 
+#if defined(PYOS_OS2)
+#include <sys/time.h>
+#include <utils.h>
+#endif
+
 #ifdef MS_WINDOWS
 #include <winsock.h>
 #else
diff --git a/Modules/signalmodule.c b/Modules/signalmodule.c
index e91c3cb..175f6eb 100644
--- a/Modules/signalmodule.c
+++ b/Modules/signalmodule.c
@@ -50,6 +50,11 @@
 #define SIG_ERR ((RETSIGTYPE (*)())-1)
 #endif
 
+#if defined(PYOS_OS2)
+#define NSIG 12
+#include <process.h>
+#endif
+
 #ifndef NSIG
 #ifdef _SIGMAX
 #define NSIG (_SIGMAX + 1)	/* For QNX */
diff --git a/Modules/socketmodule.c b/Modules/socketmodule.c
index 5819346..4de1301 100644
--- a/Modules/socketmodule.c
+++ b/Modules/socketmodule.c
@@ -91,10 +91,25 @@
 #include <unistd.h>
 #endif
 
-#ifndef MS_WINDOWS
+#if !defined(MS_WINDOWS) && !defined(PYOS_OS2)
 extern int gethostname(); /* For Solaris, at least */
 #endif
 
+#if defined(PYCC_VACPP)
+#include <types.h>
+#include <io.h>
+#include <sys/ioctl.h>
+#include <utils.h>
+#include <ctype.h>
+#endif
+
+#if defined(PYOS_OS2)
+#define  INCL_DOS
+#define  INCL_DOSERRORS
+#define  INCL_NOPMAPI
+#include <os2.h>
+#endif
+
 #include <sys/types.h>
 #include "mytime.h"
 
@@ -136,6 +151,12 @@
 #define FORCE_ANSI_FUNC_DEFS
 #endif
 
+#if defined(PYOS_OS2)
+#define close soclose
+#define NO_DUP /* Sockets are Not Actual File Handles under OS/2 */
+#define FORCE_ANSI_FUNC_DEFS
+#endif
+
 #ifdef FORCE_ANSI_FUNC_DEFS
 #define BUILD_FUNC_DEF_1( fnname, arg1type, arg1name )	\
 fnname( arg1type arg1name )
@@ -198,6 +219,36 @@
 	}
 	else
 #endif
+
+#if defined(PYOS_OS2)
+    if (sock_errno() != NO_ERROR) {
+        APIRET rc;
+        ULONG  msglen;
+        char   outbuf[100];
+        int    myerrorcode = sock_errno();
+
+        /* Retrieve Socket-Related Error Message from MPTN.MSG File */
+        rc = DosGetMessage(NULL, 0, outbuf, sizeof(outbuf),
+                           myerrorcode - SOCBASEERR + 26, "mptn.msg", &msglen);
+        if (rc == NO_ERROR) {
+            PyObject *v;
+
+            outbuf[msglen] = '\0'; /* OS/2 Doesn't Guarantee a Terminator */
+            if (strlen(outbuf) > 0) { /* If Non-Empty Msg, Trim CRLF */
+                char *lastc = &outbuf[ strlen(outbuf)-1 ];
+                while (lastc > outbuf && isspace(*lastc))
+                    *lastc-- = '\0'; /* Trim Trailing Whitespace (CRLF) */
+            }
+            v = Py_BuildValue("(is)", myerrorcode, outbuf);
+            if (v != NULL) {
+                PyErr_SetObject(PySocket_Error, v);
+                Py_DECREF(v);
+            }
+            return NULL;
+        }
+    }
+#endif
+
 	return PyErr_SetFromErrno(PySocket_Error);
 }
 
@@ -527,16 +578,21 @@
 		return NULL;
 	Py_BEGIN_ALLOW_THREADS
 #ifndef MS_WINDOWS
+#ifdef PYOS_OS2
+	block = !block;
+	ioctl(s->sock_fd, FIONBIO, (caddr_t)&block, sizeof(block));
+#else /* !PYOS_OS2 */
 	delay_flag = fcntl (s->sock_fd, F_GETFL, 0);
 	if (block)
 		delay_flag &= (~O_NDELAY);
 	else
 		delay_flag |= O_NDELAY;
 	fcntl (s->sock_fd, F_SETFL, delay_flag);
-#else
+#endif /* !PYOS_OS2 */
+#else /* MS_WINDOWS */
 	block = !block;
 	ioctlsocket(s->sock_fd, FIONBIO, (u_long*)&block);
-#endif
+#endif /* MS_WINDOWS */
 	Py_END_ALLOW_THREADS
 
 	Py_INCREF(Py_None);
@@ -883,7 +939,11 @@
 	Py_BEGIN_ALLOW_THREADS
 	n = recvfrom(s->sock_fd, PyString_AsString(buf), len, flags,
 #ifndef MS_WINDOWS
+   #if defined(PYOS_OS2)
+		     (struct sockaddr *)addrbuf, &addrlen
+   #else
 		     (ANY *)addrbuf, &addrlen
+   #endif
 #else
 		     (struct sockaddr *)addrbuf, &addrlen
 #endif
@@ -1388,22 +1448,57 @@
 
 #endif /* MS_WINDOWS */
 
+#if defined(PYOS_OS2)
+
+/* Additional initialization and cleanup for OS/2 */
+
+static void
+OS2cleanup()
+{
+    /* No cleanup is necessary for OS/2 Sockets */
+}
+
+static int
+OS2init()
+{
+    char reason[64];
+    int rc = sock_init();
+
+    if (rc == 0) {
+		atexit(OS2cleanup);
+        return 1; // Indicate Success
+    }
+
+    sprintf(reason, "OS/2 TCP/IP Error# %d", sock_errno());
+    PyErr_SetString(PyExc_ImportError, reason);
+
+	return 0;  // Indicate Failure
+}
+
+#endif /* PYOS_OS2 */
+
 
 /* Initialize this module.
-   This is called when the first 'import socket' is done,
-   via a table in config.c, if config.c is compiled with USE_SOCKET
-   defined.
-
-   For MS_WINDOWS (which means any Windows variant), this module
-   is actually called "_socket", and there's a wrapper "socket.py"
-   which implements some missing functionality (such as makefile(),
-   dup() and fromfd()).  The import of "_socket" may fail with an
-   ImportError exception if initialization of WINSOCK fails.  When
-   WINSOCK is initialized succesfully, a call to WSACleanup() is
-   scheduled to be made at exit time.  */
+ *   This is called when the first 'import socket' is done,
+ *   via a table in config.c, if config.c is compiled with USE_SOCKET
+ *   defined.
+ *
+ *   For MS_WINDOWS (which means any Windows variant), this module
+ *   is actually called "_socket", and there's a wrapper "socket.py"
+ *   which implements some missing functionality (such as makefile(),
+ *   dup() and fromfd()).  The import of "_socket" may fail with an
+ *   ImportError exception if initialization of WINSOCK fails.  When
+ *   WINSOCK is initialized succesfully, a call to WSACleanup() is
+ *   scheduled to be made at exit time.
+ *
+ *   For OS/2, this module is also called "_socket" and uses a wrapper
+ *   "socket.py" which implements that functionality that is missing
+ *   when PC operating systems don't put socket descriptors in the
+ *   operating system's filesystem layer.
+ */
 
 void
-#ifdef MS_WINDOWS
+#if defined(MS_WINDOWS) || defined(PYOS_OS2)
 init_socket()
 #else
 initsocket()
@@ -1415,7 +1510,13 @@
 		return;
 	m = Py_InitModule("_socket", PySocket_methods);
 #else
+  #if defined(__TOS_OS2__)
+	if (!OS2init())
+		return;
+	m = Py_InitModule("_socket", PySocket_methods);
+  #else
 	m = Py_InitModule("socket", PySocket_methods);
+  #endif
 #endif
 	d = PyModule_GetDict(m);
 	PySocket_Error = PyErr_NewException("socket.error", NULL, NULL);
diff --git a/Modules/timemodule.c b/Modules/timemodule.c
index e8de0ac..6390c40 100644
--- a/Modules/timemodule.c
+++ b/Modules/timemodule.c
@@ -59,7 +59,7 @@
 
 #ifdef HAVE_FTIME
 #include <sys/timeb.h>
-#ifndef MS_WINDOWS
+#if !defined(MS_WINDOWS) && !defined(PYOS_OS2)
 extern int ftime();
 #endif /* MS_WINDOWS */
 #endif /* HAVE_FTIME */
@@ -85,6 +85,18 @@
 #undef HAVE_CLOCK /* We have our own version down below */
 #endif /* MS_WIN32 */
 
+#if defined(PYOS_OS2)
+#define  INCL_DOS
+#define  INCL_DOSERRORS
+#define  INCL_NOPMAPI
+#include <os2.h>
+#endif
+
+#if defined(PYCC_VACPP)
+#include <time.h>
+#define timezone _timezone
+#endif
+
 /* Forward declarations */
 static int floatsleep Py_PROTO((double));
 static double floattime Py_PROTO(());
@@ -588,10 +600,18 @@
 	Sleep((int)(secs*1000));
 	Py_END_ALLOW_THREADS
 #else /* !MS_WIN32 */
+#ifdef PYOS_OS2
+	/* This Sleep *IS* Interruptable by Exceptions */
+	if (DosSleep(secs * 1000) != NO_ERROR) {
+		PyErr_SetFromErrno(PyExc_IOError);
+		return -1;
+	}
+#else /* !PYOS_OS2 */
 	/* XXX Can't interrupt this sleep */
 	Py_BEGIN_ALLOW_THREADS
 	sleep((int)secs);
 	Py_END_ALLOW_THREADS
+#endif /* !PYOS_OS2 */
 #endif /* !MS_WIN32 */
 #endif /* !MSDOS */
 #endif /* !__WATCOMC__ */
diff --git a/Python/importdl.c b/Python/importdl.c
index 7f35d13..b11e1e3 100644
--- a/Python/importdl.c
+++ b/Python/importdl.c
@@ -47,6 +47,7 @@
    _AIX		-- AIX style dynamic linking
    MS_WIN32	-- Windows NT style dynamic linking (using DLLs)
    MS_WIN16	-- Windows 16-bit dynamic linking (using DLLs)
+   PYOS_OS2 -- IBM OS/2 dynamic linking (using DLLs)
    _DL_FUNCPTR_DEFINED	-- if the typedef dl_funcptr has been defined
    USE_MAC_DYNAMIC_LOADING -- Mac CFM shared libraries
    SHORT_EXT	-- short extension for dynamic module, e.g. ".so"
@@ -76,6 +77,17 @@
 #define LONG_EXT "module.sl"
 #endif 
 
+#if defined(PYOS_OS2)
+#define DYNAMIC_LINK
+#define  INCL_DOSERRORS
+#define  INCL_DOSMODULEMGR
+#include <os2.h>
+typedef int (* APIENTRY dl_funcptr)();
+#define _DL_FUNCPTR_DEFINED 1
+#define SHORT_EXT ".pyd"
+#define LONG_EXT ".dll"
+#endif
+
 #if defined(__NetBSD__)
 #define DYNAMIC_LINK
 #define USE_SHLIB
@@ -458,6 +470,32 @@
 		p = GetProcAddress(hDLL, funcname);
 	}
 #endif /* MS_WIN16 */
+
+#if defined(PYOS_OS2)
+	{
+		APIRET  rc;
+		HMODULE hDLL;
+        char failreason[256];
+
+		rc = DosLoadModule(failreason,
+                           sizeof(failreason),
+                           pathname,
+                           &hDLL);
+
+		if (rc != NO_ERROR) {
+			char errBuf[256];
+			sprintf(errBuf,
+				"DLL load failed, rc = %d, problem '%s': %s", rc, failreason);
+			PyErr_SetString(PyExc_ImportError, errBuf);
+			return NULL;
+		}
+
+        rc = DosQueryProcAddr(hDLL, 0L, funcname, &p);
+        if (rc != NO_ERROR)
+            p = NULL; /* Signify Failure to Acquire Entrypoint */
+	}
+#endif /* PYOS_OS2 */
+
 #ifdef USE_DL
 	p =  dl_loadmod(Py_GetProgramName(), pathname, funcname);
 #endif /* USE_DL */
diff --git a/Python/thread.c b/Python/thread.c
index 1698b07..f441752 100644
--- a/Python/thread.c
+++ b/Python/thread.c
@@ -149,6 +149,10 @@
 #include "thread_nt.h"
 #endif
 
+#ifdef OS2_THREADS
+#include "thread_os2.h"
+#endif
+
 /*
 #ifdef FOOBAR_THREADS
 #include "thread_foobar.h"
diff --git a/Python/thread_os2.h b/Python/thread_os2.h
index 314b4cb..d52b236 100644
--- a/Python/thread_os2.h
+++ b/Python/thread_os2.h
@@ -56,7 +56,7 @@
   int aThread;
   int success = 1;
 
-  aThread = _beginthread(func,4096,arg);
+  aThread = _beginthread(func,NULL,65536,arg);
 
   if( aThread == -1 ) {
     success = 0;
@@ -210,7 +210,7 @@
 
 }
 
-void down_sema(type_sema aSemaphore, int waitflag)
+int down_sema(type_sema aSemaphore, int waitflag)
 {
   return -1;
 }