Add fallback for kcmp() in case __NR_kcmp is undefined

IA64 is missing this syscall as of linux-4.2.
This works around it until the necessary kernel patch gets merged.

diff --git a/src/basic/missing.h b/src/basic/missing.h
index bc6fbc539440b80a92aae543f40f39fd0abf7962..a073e89da4c993e68928457b43dd775997b807d1 100644 (file)
--- a/src/basic/missing.h
+++ b/src/basic/missing.h
@@ -1026,7 +1026,12 @@ static inline int renameat2(int oldfd, const char *oldname, int newfd, const cha
 
 #if !HAVE_DECL_KCMP
 static inline int kcmp(pid_t pid1, pid_t pid2, int type, unsigned long idx1, unsigned long idx2) {
+#if defined(__NR_kcmp)
         return syscall(__NR_kcmp, pid1, pid2, type, idx1, idx2);
+#else
+        errno = ENOSYS;
+        return -1;
+#endif
 }
 #endif