linux-kernel - [PATCH 5/9] tools/nolibc: implement poll() based on ppoll()

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Date:   Thu, 21 Jan 2021 08:20:27 +0100
From:   Willy Tarreau <w@....eu>
To:     "Paul E. McKenney" <paulmck@...nel.org>
Cc:     Mark Rutland <mark.rutland@....com>, valentin.schneider@....com,
        linux-kernel@...r.kernel.org, Willy Tarreau <w@....eu>
Subject: [PATCH 5/9] tools/nolibc: implement poll() based on ppoll()

Some architectures like arm64 do not implement poll() and have to
use ppoll() instead.
[This is nolibc's upstream commit 800f75c13ede]

Signed-off-by: Willy Tarreau <w@....eu>
---
 tools/include/nolibc/nolibc.h | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/tools/include/nolibc/nolibc.h b/tools/include/nolibc/nolibc.h
index fdd5524e0e54..833693faf53c 100644
--- a/tools/include/nolibc/nolibc.h
+++ b/tools/include/nolibc/nolibc.h
@@ -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))
-- 
2.28.0