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tools/nolibc: Implement poll() based on ppoll()

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Some architectures like arm64 do not implement poll() and have to use
ppoll() instead. This commit therefore makes poll() use ppoll() when
available. This is a port of nolibc's upstream commit 800f75c13ede to
the Linux kernel.

Fixes: 66b6f755ad ("rcutorture: Import a copy of nolibc")
Tested-by: Valentin Schneider <valentin.schneider@arm.com>
Tested-by: Mark Rutland <mark.rutland@arm.com> [arm64]
Signed-off-by: Willy Tarreau <w@1wt.eu>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
This commit is contained in:
Willy Tarreau 2021-01-21 08:20:27 +01:00 • committed by Paul E. McKenney
parent be60ca41fb
commit 5b1c827ca3
1 changed files with 10 additions and 0 deletions
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10
tools/include/nolibc/nolibc.h
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@ -1652,7 +1652,17 @@ int sys_pivot_root(const char *new, const char *old)
static __attribute__((unused))
int sys_poll(struct pollfd *fds, int nfds, int timeout)
{
#if defined(__NR_ppoll)
struct timespec t;
if (timeout >= 0) {
t.tv_sec = timeout / 1000;
t.tv_nsec = (timeout % 1000) * 1000000;
}
return my_syscall4(__NR_ppoll, fds, nfds, (timeout >= 0) ? &t : NULL, NULL);
#else
return my_syscall3(__NR_poll, fds, nfds, timeout);
#endif
}
static __attribute__((unused))