3 lssek: Probably should be __wur but lseek(fd,SEEK_SET,0) will succeed if
4 the descriptor is fine.
7 setuid: will always succeed given correct privileges, so there might
8 be places which don't check for it.
20 setvbuf: if stream and buffer are fine and other parameters constant,
21 it cannot really fail.
30 atexit: it is guaranteed that a certain number of handlers can be
31 registered, so some calls might need not be checked
33 random functions: one might want to discard a number of results. In any
34 case, no security problem
37 putenv: probably SHOULD be marked, but we'll wait a bit.
42 mbstowcs: probably SHOULD be marked
45 ptsname_r: probably SHOULD be marked