[R]

1. RAND_MAX
2. READ
3. READA
4. READY_STAT
5. REG
6. RESPONSE
7. RLIMIT_CORE
8. RLIMIT_CPU
9. RLIMIT_DATA
10. RLIMIT_FSIZE
11. RLIMIT_MEMLOCK
12. RLIMIT_NPROC
13. RLIMIT_OFILE
14. RLIMIT_RSS
15. RLIMIT_STACK
16. RLIM_INFINITY
17. RLIM_NLIMITS
18. ROUNDING
19. ROUND_0
20. ROUND_DOWN
21. ROUND_NEAREST
22. ROUND_UP
23. RUSAGE_CHILDREN
24. RUSAGE_SELF
25. R_OK