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BUILD.md: add some notes about Android 8+ problems to "Common Porting Problems" section

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Leonid Pliushch 2019-02-13 16:48:00 +02:00
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docs/BUILD.md
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@ -120,6 +120,12 @@ Follow the instructions until you get a working build. If a build succeeds after
- SYSV semaphores is not supported by the kernel. Use unnamed POSIX semaphores instead (named semaphores are unimplemented). - SYSV semaphores is not supported by the kernel. Use unnamed POSIX semaphores instead (named semaphores are unimplemented).
- Starting from Android 8, a [Seccomp](https://android-developers.googleblog.com/2017/07/seccomp-filter-in-android-o.html) was enabled for applications. Seccomp forbids usage of some system calls which results in crash with `Bad system call` errors.
- Starting from Android 8, programs cannot use `tcsetattr()` with `TCSAFLUSH` parameter due to SELinux. Use `TCSANOW` instead.
- Starting from Android 9, [Seccomp](https://android-developers.googleblog.com/2017/07/seccomp-filter-in-android-o.html) began to block `setuid()`-related system calls. Since Termux is primarily for single-user non-root usage, setuid/setgid functionality is discouraged anyway.
### dlopen() and RTLD_* flags ### dlopen() and RTLD_* flags
<dlfcn.h> declares <dlfcn.h> declares