Recent changes such as the Makefile.in overhaul and the introduction of
feature-driven linking broke the Android build. This commit fixes the
breakage:
- detects the presence of gettid() in configure.ac and only defines
gettid() in serval.c if HAVE_GETTID is not defined
- builds libserval.so not libservald.so on Android, to avoid a conflict
on the module name "servald" in Android.mk
- renames cli_cleanup() to command_cleanup(), defines it in
commandline.h instead of cli.h, and supplies it in android.c
- supplies the 'keyring' global in android.c
- removes log_stderr.c from the Android build, since it conflicted with
log.c
The CLI and server main loop now have no conditional JNI code. All JNI
code has been moved into separate source files, which #include the new
"jni_common.h" instead of <jni.h>. The "cli.h" header no longer
includes <jni.h>, so the rest of the Serval source code is now
unaffected by JNI definitions.
The 'cf_limbo' global variable is now thread-local, so that each thread
has its own independent copy of the loaded configuration. The JNI
server entry point now calls cf_init() once. The new 'cf_initialised'
flag prevents clobbering the config state by redundant calls to
cf_init().
The CLI "stop" command now sends SIGHUP to the specific thread in which
the server is running. This is achieved by writing the PID and TID
(Linux Thread ID) into the pidfile, separated by a space, on systems
that support the Linux gettid() and tgkill() system calls. The server's
signal handler has been overhauled, and its logging improved.
Recent addition of the GCC __attribute__(alloc_size) to some functions
in mem.h broke the build when using Clang 3.5. This commit introduces
configure-time checks for all GCC attributes used in the Serval source
code, and adapts accordingly.
