From 4091dcd4699cc04d59068f86fa6d5e6c578e4eca Mon Sep 17 00:00:00 2001
From: =?utf8?q?Zbigniew=20J=C4=99drzejewski-Szmek?= <zbyszek@in.waw.pl>
Date: Sat, 15 Aug 2020 19:01:23 +0200
Subject: [PATCH] missing_syscall: fix pidfd_{send_signal,open} numbers for
 alpha

Also order the syscalls by syscall number for easier comparisons with the
kernel headers.

Fixup for 5f152f43d04e5aad6a3f98f45f020a66e3aac717.

(cherry picked from commit 23654cee136862996d92e7f1e9887786ddb3dfe6)
---
 src/basic/missing_syscall.h | 54 ++++++++++++++++++++++---------------
 1 file changed, 32 insertions(+), 22 deletions(-)

diff --git a/src/basic/missing_syscall.h b/src/basic/missing_syscall.h
index 41164ea7d0..9bc431c12f 100644
--- a/src/basic/missing_syscall.h
+++ b/src/basic/missing_syscall.h
@@ -527,39 +527,49 @@ static inline long missing_get_mempolicy(int *mode, unsigned long *nodemask,
 #define get_mempolicy missing_get_mempolicy
 #endif
 
-#if !HAVE_PIDFD_OPEN
-/* may be (invalid) negative number due to libseccomp, see PR 13319 */
-#  if ! (defined __NR_pidfd_open && __NR_pidfd_open >= 0)
-#    if defined __NR_pidfd_open
-#      undef __NR_pidfd_open
-#    endif
-#    define __NR_pidfd_open 434
-#endif
-static inline int pidfd_open(pid_t pid, unsigned flags) {
-#ifdef __NR_pidfd_open
-        return syscall(__NR_pidfd_open, pid, flags);
-#else
-        errno = ENOSYS;
-        return -1;
-#endif
-}
-#endif
-
 #if !HAVE_PIDFD_SEND_SIGNAL
 /* may be (invalid) negative number due to libseccomp, see PR 13319 */
 #  if ! (defined __NR_pidfd_send_signal && __NR_pidfd_send_signal >= 0)
 #    if defined __NR_pidfd_send_signal
 #      undef __NR_pidfd_send_signal
 #    endif
-#    define __NR_pidfd_send_signal 424
-#endif
+/* should be always defined, see kernel 39036cd2727395c3369b1051005da74059a85317 */
+#    if defined(__alpha__)
+#      define __NR_pidfd_send_signal 534
+#    else
+#      define __NR_pidfd_send_signal 424
+#    endif
+#  endif
 static inline int pidfd_send_signal(int fd, int sig, siginfo_t *info, unsigned flags) {
-#ifdef __NR_pidfd_open
+#  ifdef __NR_pidfd_open
         return syscall(__NR_pidfd_send_signal, fd, sig, info, flags);
-#else
+#  else
         errno = ENOSYS;
         return -1;
+#  endif
+}
 #endif
+
+#if !HAVE_PIDFD_OPEN
+/* may be (invalid) negative number due to libseccomp, see PR 13319 */
+#  if ! (defined __NR_pidfd_open && __NR_pidfd_open >= 0)
+#    if defined __NR_pidfd_open
+#      undef __NR_pidfd_open
+#    endif
+/* should be always defined, see kernel 7615d9e1780e26e0178c93c55b73309a5dc093d7 */
+#    if defined(__alpha__)
+#      define __NR_pidfd_open 544
+#    else
+#      define __NR_pidfd_open 434
+#    endif
+#  endif
+static inline int pidfd_open(pid_t pid, unsigned flags) {
+#  ifdef __NR_pidfd_open
+        return syscall(__NR_pidfd_open, pid, flags);
+#  else
+        errno = ENOSYS;
+        return -1;
+#  endif
 }
 #endif
 
-- 
2.25.1