3 lssek: Probably should be __wur but lseek(fd,SEEK_SET,0) will succeed if
4 the descriptor is fine.
9 setvbuf: if stream and buffer are fine and other parameters constant,
10 it cannot really fail.
19 atexit: it is guaranteed that a certain number of handlers can be
20 registered, so some calls might need not be checked
22 random functions: one might want to discard a number of results. In any
23 case, no security problem
26 putenv: probably SHOULD be marked, but we'll wait a bit.
31 mbstowcs: probably SHOULD be marked
34 ptsname_r: probably SHOULD be marked