1From 0a3222338efc108c831fbdd719a47d35f4b0adcd Mon Sep 17 00:00:00 2001
2From: Khem Raj <raj.khem@gmail.com>
3Date: Wed, 18 Aug 2021 06:49:25 +0000
4Subject: [PATCH] aio_linux: Check if syscall exists before using it
5
6Return -ENOSYS if not implememented, fixes build on arches like RISCV32
7Fixes
8tpool/aio_linux.cc:63:20: error: '__NR_io_getevents' was not declared in this scope; did you mean 'io_getevents'?
9   63 |   int ret= syscall(__NR_io_getevents, reinterpret_cast<long>(ctx),
10      |                    ^~~~~~~~~~~~~~~~~
11      |                    io_getevents
12
13Upstream-Staus: Pending
14Signed-off-by: Khem Raj <raj.khem@gmail.com>
15---
16 tpool/aio_linux.cc | 4 ++++
17 1 file changed, 4 insertions(+)
18
19diff --git a/tpool/aio_linux.cc b/tpool/aio_linux.cc
20index 4abc213..da75411 100644
21--- a/tpool/aio_linux.cc
22+++ b/tpool/aio_linux.cc
23@@ -58,6 +58,7 @@ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02111 - 1301 USA*/
24 */
25 static int my_getevents(io_context_t ctx, long min_nr, long nr, io_event *ev)
26 {
27+#ifdef __NR_io_getevents
28   int saved_errno= errno;
29   int ret= syscall(__NR_io_getevents, reinterpret_cast<long>(ctx),
30                    min_nr, nr, ev, 0);
31@@ -67,6 +68,9 @@ static int my_getevents(io_context_t ctx, long min_nr, long nr, io_event *ev)
32     errno= saved_errno;
33   }
34   return ret;
35+#else
36+  return -ENOSYS;
37+#endif
38 }
39
40
41--
422.29.2
43
44