termux-packages/packages/python/multiprocessing.patch

diff -uNr Python-3.10.1/Lib/multiprocessing/heap.py Python-3.10.1.mod/Lib/multiprocessing/heap.py
--- Python-3.10.1/Lib/multiprocessing/heap.py      2022-02-07 11:51:46.427116300 +0800
+++ Python-3.10.1.mod/Lib/multiprocessing/heap.py  2022-02-07 11:52:48.432577700 +0800
@@ -70,7 +70,7 @@
         """
 
         if sys.platform == 'linux':
-            _dir_candidates = ['/dev/shm']
+            _dir_candidates = []
         else:
             _dir_candidates = []
 

diff -uNr Python-3.10.1/Modules/_multiprocessing/multiprocessing.c Python-3.10.1.mod/Modules/_multiprocessing/multiprocessing.c
--- Python-3.10.1/Modules/_multiprocessing/multiprocessing.c        2021-12-07 02:23:39.000000000 +0800
+++ Python-3.10.1.mod/Modules/_multiprocessing/multiprocessing.c    2022-02-10 03:05:11.249248300 +0800
@@ -172,7 +172,7 @@
     _MULTIPROCESSING_RECV_METHODDEF
     _MULTIPROCESSING_SEND_METHODDEF
 #endif
-#if !defined(POSIX_SEMAPHORES_NOT_ENABLED) && !defined(__ANDROID__)
+#if !defined(POSIX_SEMAPHORES_NOT_ENABLED)
     _MULTIPROCESSING_SEM_UNLINK_METHODDEF
 #endif
     {NULL}

diff -uNr Python-3.10.1/Modules/_multiprocessing/posixshmem.c Python-3.10.1.mod/Modules/_multiprocessing/posixshmem.c
--- Python-3.10.1/Modules/_multiprocessing/posixshmem.c     2021-12-07 02:23:39.000000000 +0800
+++ Python-3.10.1.mod/Modules/_multiprocessing/posixshmem.c 2022-02-10 01:37:03.547649100 +0800
@@ -11,6 +11,9 @@
 #include <sys/mman.h>
 #endif
 
+int shm_open(const char *, int, mode_t);
+int shm_unlink(const char *);
+
 /*[clinic input]
 module _posixshmem
 [clinic start generated code]*/

diff -uNr Python-3.10.1/Modules/_multiprocessing/posix-shm-extension.c Python-3.10.1.mod/Modules/_multiprocessing/posix-shm-extension.c
--- Python-3.10.1/Modules/_multiprocessing/posix-shm-extension.c        1970-01-01 08:00:00.000000000 +0800
+++ Python-3.10.1.mod/Modules/_multiprocessing/posix-shm-extension.c    2022-02-12 13:25:30.306949200 +0800
@@ -0,0 +1,76 @@
+/* This file is a port of posix shared memory for Python3 on Termux Android, 
+   based on musl-libc which is licensed under the following standard MIT 
+   license. The ported files are listed as following.
+
+   File(s): src/mman/shm_open.c
+
+   Copyright © 2005-2020 Rich Felker, et al.
+
+   Permission is hereby granted, free of charge, to any person obtaining
+   a copy of this software and associated documentation files (the
+   "Software"), to deal in the Software without restriction, including
+   without limitation the rights to use, copy, modify, merge, publish,
+   distribute, sublicense, and/or sell copies of the Software, and to
+   permit persons to whom the Software is furnished to do so, subject to
+   the following conditions:
+
+   The above copyright notice and this permission notice shall be
+   included in all copies or substantial portions of the Software.
+
+   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+   EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+   MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+   IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+   CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+   TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+   SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#include <fcntl.h>     // open()
+#include <string.h>    // strlen(), memcpy()
+#include <errno.h>     // errno
+#include <limits.h>    // NAME_MAX
+#include <unistd.h>    // unlink()
+
+#define SHM_PREFIX "@TERMUX_PREFIX@/tmp/shm."
+
+static __inline__ char *__strchrnul(const char *s, int c)
+{
+    c = (unsigned char)c;
+    if (!c) return (char *)s + strlen(s);
+    for (; *s && *(unsigned char *)s != c; s++);
+    return (char *)s;
+}
+
+static char *__shm_mapname(const char *name, char *buf)
+{
+    char *p;
+    while (*name == '/') name++;
+    if (*(p = __strchrnul(name, '/')) || p==name ||
+        (p-name <= 2 && name[0]=='.' && p[-1]=='.')) {
+        errno = EINVAL;
+        return 0;
+    }
+    if (p-name > NAME_MAX-4) {
+        errno = ENAMETOOLONG;
+        return 0;
+    }
+    memcpy(buf, SHM_PREFIX, strlen(SHM_PREFIX));
+    memcpy(buf+strlen(SHM_PREFIX), name, p-name+1);
+    return buf;
+}
+
+int shm_open(const char *name, int flag, mode_t mode)
+{
+    char buf[NAME_MAX+strlen(SHM_PREFIX)+1];
+    if (!(name = __shm_mapname(name, buf))) return -1;
+    int fd = open(name, flag|O_NOFOLLOW|O_CLOEXEC|O_NONBLOCK, mode);
+    return fd;
+}
+
+int shm_unlink(const char *name)
+{
+    char buf[NAME_MAX+strlen(SHM_PREFIX)+1];
+    if (!(name = __shm_mapname(name, buf))) return -1;
+    return unlink(name);
+}

diff -uNr Python-3.10.1/setup.py Python-3.10.1.mod/setup.py
--- Python-3.10.1/setup.py      2021-12-07 02:23:39.000000000 +0800
+++ Python-3.10.1.mod/setup.py  2022-02-10 17:26:38.314970000 +0800
@@ -1846,12 +1846,14 @@
                 sysconfig.get_config_var('POSIX_SEMAPHORES_NOT_ENABLED')):
                 multiprocessing_srcs.append('_multiprocessing/semaphore.c')
         self.add(Extension('_multiprocessing', multiprocessing_srcs,
+                           libraries=["android-posix-semaphore"],
                            include_dirs=["Modules/_multiprocessing"]))
 
         if (not MS_WINDOWS and
            sysconfig.get_config_var('HAVE_SHM_OPEN') and
            sysconfig.get_config_var('HAVE_SHM_UNLINK')):
-            posixshmem_srcs = ['_multiprocessing/posixshmem.c']
+            posixshmem_srcs = ['_multiprocessing/posixshmem.c', 
+                               '_multiprocessing/posix-shm-extension.c']
             libs = []
             if sysconfig.get_config_var('SHM_NEEDS_LIBRT'):
                 # need to link with librt to get shm_open()