[PATCH 3/3] gssd: base the size of the fd array on the RLIMIT_NOFILE limit.

[Neil Brown <neilb@suse.de>]

We have previously raised the size of the 'pollarray' once (32 -> 256)
and I have had another request to make it bigger.
Rather than changing the hard-coded value, make it depend on
RLIMIT_NOFILE.  This is an upper limit on the size of the array
that can be passed to poll() anyway.

Signed-off-by: NeilBrown <neilb@suse.de>
---
 utils/gssd/gssd_proc.c |    5 +++++
 1 file changed, 5 insertions(+)

diff --git a/utils/gssd/gssd_proc.c b/utils/gssd/gssd_proc.c
index 425b582..e32b2f0 100644
--- a/utils/gssd/gssd_proc.c
+++ b/utils/gssd/gssd_proc.c
@@ -52,6 +52,7 @@
 #include <sys/socket.h>
 #include <arpa/inet.h>
 #include <sys/fsuid.h>
+#include <sys/resource.h>
 
 #include <stdio.h>
 #include <stdlib.h>
@@ -483,9 +484,13 @@ fail_keep_client:
 void
 init_client_list(void)
 {
+	struct rlimit rlim;
 	TAILQ_INIT(&clnt_list);
 	/* Eventually plan to grow/shrink poll array: */
 	pollsize = FD_ALLOC_BLOCK;
+	if (getrlimit(RLIMIT_NOFILE, &rlim) < 0 &&
+	    rlim.rlim_cur != RLIM_INFINITY)
+		pollsize = rlim.rlim_cur;
 	pollarray = calloc(pollsize, sizeof(struct pollfd));
 }