asometh

# aso method feature tests

aso fcntl note{ fcntl(F_SETLCK[W]) work }end link{
		#include <sys/types.h>
		#include <unistd.h>
		#include <fcntl.h>

		int main()
		{
			struct flock	lock;

			lock.l_type = F_WRLCK;
			lock.l_whence = SEEK_SET;
			lock.l_start = 0;
			lock.l_len = 1;
			return fcntl(1, F_SETLKW, &lock) < 0;
		}
}end

aso semaphore note{ semget semop semctl work }end link{
		#include <sys/types.h>
		#include <sys/stat.h>
		#include <unistd.h>
		#include <fcntl.h>
		#include <sys/ipc.h>
		#include <sys/sem.h>

		int main()
		{
			int		id;
			struct sembuf	sem;

			if ((id = semget(IPC_PRIVATE, 16, IPC_CREAT|IPC_EXCL|S_IRUSR|S_IWUSR)) < 0)
				return 1;
			sem.sem_num = 0;
			sem.sem_op = 1;
			sem.sem_flg = 0;
			if (semop(id, &sem, 1) < 0)
				return 1;
			if (semctl(id, 0, IPC_RMID) < 0)
				return 1;
			return 0;
		}
}end