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From: "mlichvar at redhat dot com" <sourceware-bugzilla@sourceware.org>
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Subject: [Bug libc/29417] poll() declared with write-only fds
Date: Wed, 27 Jul 2022 15:18:28 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D29417

--- Comment #2 from Miroslav Lichvar <mlichvar at redhat dot com> ---
FWIW, a poll() function using that declaration triggers a compiler warning:

#include <poll.h>
int poll(struct pollfd *fds, nfds_t nfds, int timeout) {
        return nfds >=3D 1 && fds[0].fd >=3D 0;
}

x.c: In function =E2=80=98poll=E2=80=99:
x.c:4:35: warning: =E2=80=98*fds.fd=E2=80=99 may be used uninitialized [-Wm=
aybe-uninitialized]
    4 |         return nfds >=3D 1 && fds[0].fd >=3D 0;
      |                             ~~~~~~^~~
x.c:3:25: note: accessing argument 1 of a function declared with attribute
=E2=80=98access (write_only, 1, 2)=E2=80=99
    3 | int poll(struct pollfd *fds, nfds_t nfds, int timeout) {
      |          ~~~~~~~~~~~~~~~^~~

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