Initial commit

.gitignore

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+*.o
+*.so
+tags
+test/test-*

LICENSE

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+Copyright (c) 2013, Sergii Pylypenko
+Copyright (c) 2017, Fredrik Fornwall
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without modification,
+are permitted provided that the following conditions are met:
+
+* Redistributions of source code must retain the above copyright notice, this
+  list of conditions and the following disclaimer.
+
+* Redistributions in binary form must reproduce the above copyright notice, this
+  list of conditions and the following disclaimer in the documentation and/or
+  other materials provided with the distribution.
+
+* Neither the name of the {organization} nor the names of its
+  contributors may be used to endorse or promote products derived from
+  this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
+ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

Makefile

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+CFLAGS += -fpic -shared -std=c11 -Wall -Wextra -Wl,--version-script=exports.txt
+
+libandroid-shmem.so: shmem.c shm.h
+	$(CC) $(CFLAGS) $(LDFLAGS) shmem.c -llog -o $@
+
+install: libandroid-shmem.so shm.h
+	cp libandroid-shmem.so $(PREFIX)/lib/libandroid-shmem.so
+	cp shm.h $(PREFIX)/include/sys/shm.h
+
+clean:
+	rm -f libandroid-shmem.so
+
+.PHONY: install

README.md

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+libandroid-shmem
+================
+System V shared memory (shmget, shmat, shmdt and shmctl) emulation
+on Android using ashmem.
+
+The shared memory segments it creates will be automatically destroyed
+when the creating process destroys them or dies, which differs from
+the System V shared memory behaviour.
+
+Based on previous work in https://github.com/pelya/android-shmem.

build.sh

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+#!/bin/sh
+
+arm-linux-androideabi-gcc \
+	-march=armv7-a \
+	-shared \
+	-fpic \
+	-std=c11 \
+	-Wall \
+	-Wextra \
+	*.c \
+	-I . \
+	-o libandroid-shmem.so \
+	-Wl,--version-script=exports.txt
+

exports.txt

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+{
+	global:
+		shmctl;
+		shmget;
+		shmat;
+		shmdt;
+
+	local: *;         # hide everything else
+};

shm.h

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+#ifndef _SYS_SHM_H
+#define _SYS_SHM_H
+
+#include <linux/shm.h>
+#include <stdint.h>
+#include <sys/types.h>
+
+__BEGIN_DECLS
+
+/* Shared memory control operations. */
+extern int shmctl(int shmid, int cmd, struct shmid_ds* buf);
+
+/* Get shared memory area identifier. */
+extern int shmget(key_t key, size_t size, int shmflg);
+
+/* Attach shared memory segment. */
+extern void *shmat(int shmid, void const* shmaddr, int shmflg);
+
+/* Detach shared memory segment. */
+extern int shmdt(void const* shmaddr);
+
+__END_DECLS
+
+#endif