nonnull on epoll_wait(2) syscall wrappers?
Alejandro Colomar
alx.manpages@gmail.com
Fri May 19 22:50:52 GMT 2023
Hi Adhemerval,
I was checking the epoll_pwait2(2) man page to see if it needs some
updating for the wrapper you added recently. It seems all's good.
<https://sourceware.org/bugzilla/show_bug.cgi?id=27359>
However, I noticed that there's a difference between the current
manual page and the glibc wrappers for the 3 related functions:
$ grepc -x /sys/epoll.h$ epoll_wait /usr/include/
/usr/include/x86_64-linux-gnu/sys/epoll.h:124:
extern int epoll_wait (int __epfd, struct epoll_event *__events,
int __maxevents, int __timeout)
__attr_access ((__write_only__, 2, 3));
$ grepc -x /sys/epoll.h$ epoll_pwait /usr/include/
/usr/include/x86_64-linux-gnu/sys/epoll.h:134:
extern int epoll_pwait (int __epfd, struct epoll_event *__events,
int __maxevents, int __timeout,
const __sigset_t *__ss)
__attr_access ((__write_only__, 2, 3));
$ grepc -x /sys/epoll.h$ epoll_pwait2 /usr/include/
/usr/include/x86_64-linux-gnu/sys/epoll.h:144:
extern int epoll_pwait2 (int __epfd, struct epoll_event *__events,
int __maxevents, const struct timespec *__timeout,
const __sigset_t *__ss)
__attr_access ((__write_only__, 2, 3));
/usr/include/x86_64-linux-gnu/sys/epoll.h:157:
# define epoll_pwait2 __epoll_pwait2_time64
The man page synopsis is:
SYNOPSIS
#include <sys/epoll.h>
int epoll_wait(int epfd, struct epoll_event *events,
int maxevents, int timeout);
int epoll_pwait(int epfd, struct epoll_event *events,
int maxevents, int timeout,
const sigset_t *_Nullable sigmask);
int epoll_pwait2(int epfd, struct epoll_event *events,
int maxevents, const struct timespec *_Nullable timeout,
const sigset_t *_Nullable sigmask);
I didn't use _Nullable in the events parameter, because I don't think
it can be NULL. Does it make any sense in any case having a NULL
there? Should we use nonnull in glibc?
Cheers,
Alex
--
<http://www.alejandro-colomar.es/>
GPG key fingerprint: A9348594CE31283A826FBDD8D57633D441E25BB5
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