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<unistd.h>:
lssek: Probably should be __wur but lseek(fd,SEEK_SET,0) will succeed if
the descriptor is fine.
lseek64: same
setuid: will always succeed given correct privileges, so there might
be places which don't check for it.
setreuid: same
seteuid: same
setgid: same
setregid: same
setegid: same
setresuid: same
setresgid: same
<stdio.h>:
setvbuf: if stream and buffer are fine and other parameters constant,
it cannot really fail.
fseek: see lseek
fseeko: likewise
fgetpos: similarly
fsetpos: likewise
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