X-Git-Url: https://git.lttng.org/?p=lttng-tools.git;a=blobdiff_plain;f=src%2Fcommon%2Fcompat%2Fcompat-epoll.c;h=9055f51291475ae31b9508f7197d3eb581d2cc89;hp=794041726ad51226e331c511526c4ff95de128d5;hb=4fb28dfc10106c4095ca3b1155d4da9a04467fd1;hpb=9f32e9bf43a6438c55f35d3c5ed1c378d0c715c4

diff --git a/src/common/compat/compat-epoll.c b/src/common/compat/compat-epoll.c
index 794041726..9055f5129 100644
--- a/src/common/compat/compat-epoll.c
+++ b/src/common/compat/compat-epoll.c
@@ -1,18 +1,8 @@
 /*
- * Copyright (C)  2011 - David Goulet <david.goulet@polymtl.ca>
+ * Copyright (C) 2011 David Goulet <david.goulet@polymtl.ca>
  *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License, version 2 only,
- * as published by the Free Software Foundation.
+ * SPDX-License-Identifier: GPL-2.0-only
  *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; if not, write to the Free Software Foundation, Inc.,
- * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  */
 
 #define _LGPL_SOURCE
@@ -32,7 +22,17 @@
 
 #include "poll.h"
 
-unsigned int poll_max_size;
+/*
+ * Maximum number of fd we can monitor.
+ *
+ * For epoll(7), /proc/sys/fs/epoll/max_user_watches (since Linux 2.6.28) will
+ * be used for the maximum size of the poll set. If this interface is not
+ * available, according to the manpage, the max_user_watches value is 1/25 (4%)
+ * of the available low memory divided by the registration cost in bytes which
+ * is 90 bytes on a 32-bit kernel and 160 bytes on a 64-bit kernel.
+ *
+ */
+static unsigned int poll_max_size;
 
 /*
  * Resize the epoll events structure of the new size.
@@ -68,6 +68,7 @@ error:
 /*
  * Create epoll set and allocate returned events structure.
  */
+LTTNG_HIDDEN
 int compat_epoll_create(struct lttng_poll_event *events, int size, int flags)
 {
 	int ret;
@@ -120,6 +121,7 @@ error:
 /*
  * Add a fd to the epoll set with requesting events.
  */
+LTTNG_HIDDEN
 int compat_epoll_add(struct lttng_poll_event *events, int fd, uint32_t req_events)
 {
 	int ret;
@@ -167,6 +169,7 @@ error:
 /*
  * Remove a fd from the epoll set.
  */
+LTTNG_HIDDEN
 int compat_epoll_del(struct lttng_poll_event *events, int fd)
 {
 	int ret;
@@ -201,6 +204,7 @@ error:
 /*
  * Set an fd's events.
  */
+LTTNG_HIDDEN
 int compat_epoll_mod(struct lttng_poll_event *events, int fd, uint32_t req_events)
 {
 	int ret;
@@ -242,6 +246,7 @@ error:
 /*
  * Wait on epoll set. This is a blocking call of timeout value.
  */
+LTTNG_HIDDEN
 int compat_epoll_wait(struct lttng_poll_event *events, int timeout,
 		bool interruptible)
 {
@@ -296,6 +301,7 @@ error:
 /*
  * Setup poll set maximum size.
  */
+LTTNG_HIDDEN
 int compat_epoll_set_max_size(void)
 {
 	int ret, fd, retval = 0;