apps/examples/ltp: port LTP Open POSIX Test Suite to TizenRT

[vivek1-j]

Port 696 LTP tests across 8 OS-specific categories: scheduler (71), pthreads (99), signals (343), condvar (2), stress (10), timers (56), mqueues (92), and semaphores (23).

LTP test runner (ltprun):

• Implemented in ltp_runner.c as a TASH command for batch execution
• Each test runs in a separate task via task_create() + waitpid() to isolate tests that call exit()
• Test index passed as string argument using a static buffer
• Supports: ltprun all/category/test/list/stop with repeat (-r) option
• ltp_register.sh auto-discovers tests during build context phase, filters blacklisted files, and generates ltp_test_registry.h
• Each test main() renamed via -Dmain= compiler flag

Blacklisted tests:

• BLACKWORDS: ~40+ grep patterns excluding files referencing unimplemented POSIX APIs (fork, sigaltstack, sysconf, clock_nanosleep, pthread_mutex_timedlock, pthread_rwlockattr_*, user identity APIs, shared memory, etc.)
• BLACKSRCS: 11 explicit files excluded for using Linux-specific APIs (setrlimit, uname, setitimer, PTHREAD_SCOPE_SYSTEM, SCHED_OTHER, fork)
• Config-dependent blacklists for CONFIG_PTHREAD_CLEANUP, CONFIG_SMP, CONFIG_RR_INTERVAL, CONFIG_FS_NAMED_SEMAPHORES, CONFIG_MQ_MAXMSGSIZE

Patches applied (22 patches, 0001-0023):

Patch	File(s)	Description
0001	pthread_rwlock_unlock	Follow Linux rwlock unlock behavior for TizenRT
0002	Multiple files	Use #ifdef instead of #if for linux guard
0003	stress/threads/sigqueue/s-c.c	Re-init static variable for multiple runs
0004	pthread_cond_wait	Update test case for TizenRT compatibility
0005	pthread_cond_timedwait	Update testcase for TizenRT
0006	pthread_rwlock_*	Fix rwlock initialization requirement
0007	pthread_kill	Add usleep to avoid semcount overturn
0008	sigaction/23-10.c	Fix deadloop in sigaction test
0009	Multiple files	Modify user code for fdcheck compatibility
0010	sem_open/s-c1.c	Fix build warning (static struct row)
0011	tst_process_state.h	Fix proc.h header duplicate inclusion
0012	Multiple files	Fix build errors
0013	affinity.h	Fix errno lvalue in affinity helper
0014	pthread_attr_setschedpolicy	Fix sched policy check for TizenRT
0015	affinity.h	Add TizenRT SMP affinity support
0016	sched_setscheduler/16-1.c	Fix return value check
0017	pthread_setschedparam/5-1.c	Fix deadlock (add usleep and sem_post)
0018	pthread_setschedprio/1-1.c	Add completion print and fflush
0019	schedule, condvar	Fix priority values (150/120 for TizenRT)
0021	signal/6-1.c, 7-1.c	Fix errno lvalue bug (use set_errno())
0022	mq_timedsend/12-1.c	Fix errno lvalue in error_and_exit macro
0023	pthread_mutex_lock/s-c1.c	Fix bool variable name conflict with stdbool.h

Authored-By: Vivek Jainvivek1.j@samsung.com