xap_helper.h: add missing headers and avoid reallocarray

These changes are necessary with glibc 2.17 and g++ 4.8.5
on CentOS 7.x.  We don't have to worry about overflow with
realloc(3) here since WORKER_MAX is only USHRT_MAX and
sizeof(pid_t) is 4 bytes on every platform I've encountered.

1 files changed, 5 insertions, 2 deletions

diff --git a/lib/PublicInbox/xap_helper.h b/lib/PublicInbox/xap_helper.h
index 377ff45a..5f04316c 100644
--- a/lib/PublicInbox/xap_helper.h
+++ b/lib/PublicInbox/xap_helper.h
@@ -35,7 +35,10 @@
 #include <limits.h>
 #include <search.h>
 #include <signal.h>
+#include <stddef.h>
+#include <stdint.h>
 #include <stdio.h>
+#include <stdlib.h>
 #include <string.h>
 #include <sysexits.h>
 #include <unistd.h>
@@ -1084,9 +1087,9 @@ static void do_sigttin(void)
                 warnx("workers cannot exceed %zu", (size_t)WORKER_MAX);
                 return;
         }
-        void *p = reallocarray(worker_pids, nworker + 1, sizeof(pid_t));
+        void *p = realloc(worker_pids, (nworker + 1) * sizeof(pid_t));
         if (!p) {
-                warn("reallocarray");
+                warn("realloc worker_pids");
         } else {
                 worker_pids = (pid_t *)p;
                 worker_pids[nworker++] = 0;