liblog.so: cannot open shared object file

[SDRausty]

Shared memory appears to be important in many issues:

1. Sudo is non functional SDRausty/termux-archlinux#4
2. Succesfully Modified Stock 'makepkg'... SDRausty/TermuxArch#38
3. WebKit Browsers Showing Nothing instead of Web Content SDRausty/TermuxArch#55
4. A few questions about Arch Linux in Termux PRoot SDRausty/TermuxArch#59 (comment)
5. Chromium, Firefox, Epiphany, Libreoffice, localectl, timedatectl... SDRausty/TermuxArch#68

Arch Linux in Termux PRoot:

[19:09 libandroid-shmem ]$ make
cc -fpic -shared -std=c11 -Wall -Wextra -Wl,--version-script=exports.txt  shmem.c -llog -o libandroid-shmem.so
shmem.c:1:10: fatal error: android/log.h: No such file or directory
 #include <android/log.h>
          ^~~~~~~~~~~~~~~
compilation terminated.
make: *** [Makefile:4: libandroid-shmem.so] Error 1
[19:09 libandroid-shmem ]$ l android/log.h
-rw-r--r-- 1 e 4452 Nov 9 09:57 android/log.h
[19:09 libandroid-shmem ]$ cd test/ 
[19:11 test ]$ make
cc -Wall -Wextra -Werror -std=c99 -DSYSV_ASHMEM_TEST_SYSTEM error-codes.c -o test-error-codes
./test-error-codes
shmget: Permission denied
make: *** [Makefile:19: testcase-error-codes] Error 1

Termux:

[21:40 libandroid-shmem ]$ make install cc -fpic -shared -std=c11 -Wall -Wextra -Wl,--version-script=exports.txt shmem.c -llog -o libandroid-shmem.so
install -D libandroid-shmem.so /data/data/com.termux/files/usr/lib/libandroid-shmem.so
install -D shm.h /data/data/com.termux/files/usr/include/sys/shm.h

The Arch Linux in Termux PRoot sudo error has changed:

[23:16 data ]$ env LD_PRELOAD=/data/data/com.termux/files/usr/lib/libandroid-shmem.so startarch su user sudo
sudo: error in /etc/sudo.conf, line 0 while loading plugin "sudoers_policy"
sudo: unable to load /usr/lib/sudo/sudoers.so: /usr/lib/sudo/sudoers.so: cannot stat shared object: Bad file descriptor
sudo: fatal error, unable to load plugins
[23:16 data ]$ env LD_PRELOAD=/data/data/com.termux/files/usr/lib/libandroid-shmem.so startarch l user
Welcome to Arch Linux in Termux!
Install a package: pacman -S package
More  information: pacman [-D|F|Q|R|S|T|U]h
Search   packages: pacman -Ss query
Upgrade  packages: pacman -Syu

Chat: https://gitter.im/termux
Help: info query and man query
IRC:  wiki.archlinux.org/index.php/IRC_channel

[23:17 ~ ]$ sudo
sudo: error in /etc/sudo.conf, line 0 while loading plugin "sudoers_policy"
sudo: unable to load /usr/lib/sudo/sudoers.so: /usr/lib/sudo/sudoers.so: cannot stat shared object: Bad file descriptor
sudo: fatal error, unable to load plugins
[23:17 ~ ]$ env LD_PRELOAD=/data/data/com.termux/files/usr/lib/libandroid-shmem.so sudo
sudo: error while loading shared libraries: liblog.so: cannot open shared object file: No such file or directory

[andymwat]

I'm having the same issue. I downloaded liblog.so from https://github.com/innogames/android-ndk/blob/master/platforms/android-24/arch-arm64/usr/lib/liblog.so, but when I added it to my LD_PRELOAD path, the error changes to:
/bin/sh: error while loading shared libraries: /usr/lib/aarch64-linux-gnu/libc.so: invalid ELF header
When I replace the libc.so in that folder with the one from that repository, it segfaults.

[ghost]

Regarding use of libandroid-shmem in chroot'ed environments, answer is in #6 (comment) (in short: current version cannot be used).