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472fdf |
From 69e1baa7d7f271d294e619148b4a2bae10230b5e Mon Sep 17 00:00:00 2001
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472fdf |
From: Simo Sorce <simo@redhat.com>
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472fdf |
Date: Wed, 6 Mar 2019 10:31:13 -0500
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472fdf |
Subject: [PATCH] Close epoll fd within the lock
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472fdf |
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472fdf |
A race condition may happen where we close the epoll socket, after
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472fdf |
another thread grabbed the lock and is using epoll itself.
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472fdf |
On some kernels this may cause epoll to not fire any event leaving the
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472fdf |
thread stuck forever.
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472fdf |
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472fdf |
Signed-off-by: Simo Sorce <simo@redhat.com>
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
472fdf |
[rharwood@redhat.com: cleanup commit message, adjusted function ordering]
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472fdf |
Reviewed-by: Robbie Harwood <rharwood@redhat.com>
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472fdf |
Merges: #241
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472fdf |
(cherry picked from commit 0ccfd32f8ef16caf65698c5319dfa251d43433af)
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472fdf |
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472fdf |
Squashed with:
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472fdf |
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472fdf |
Reorder functions
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472fdf |
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472fdf |
Keep related functions closer together like before
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472fdf |
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472fdf |
Signed-off-by: Simo Sorce <simo@redhat.com>
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
472fdf |
Reviewed-by: Robbie Harwood <rharwood@redhat.com>
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
472fdf |
Resolves: #242
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472fdf |
(cherry picked from commit 6accc0afead574e11447447c949f2abcb1a34826)
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472fdf |
(cherry picked from commit c33de0c213d570f370fd954869c2ad99901b2cf3)
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472fdf |
[rharwood@redhat.com: I learned an important lesson upstream]
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472fdf |
---
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472fdf |
proxy/src/client/gpm_common.c | 100 ++++++++++++++++++----------------
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472fdf |
1 file changed, 54 insertions(+), 46 deletions(-)
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472fdf |
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472fdf |
diff --git a/proxy/src/client/gpm_common.c b/proxy/src/client/gpm_common.c
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472fdf |
index b482efb..554c91c 100644
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472fdf |
--- a/proxy/src/client/gpm_common.c
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472fdf |
+++ b/proxy/src/client/gpm_common.c
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472fdf |
@@ -139,44 +139,8 @@ static void gpm_close_socket(struct gpm_ctx *gpmctx)
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472fdf |
gpmctx->fd = -1;
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472fdf |
}
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472fdf |
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472fdf |
-static int gpm_grab_sock(struct gpm_ctx *gpmctx)
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472fdf |
+static void gpm_timer_close(struct gpm_ctx *gpmctx)
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472fdf |
{
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472fdf |
- int ret;
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472fdf |
- pid_t p;
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472fdf |
- uid_t u;
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472fdf |
- gid_t g;
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472fdf |
-
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472fdf |
- ret = pthread_mutex_lock(&gpmctx->lock);
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- if (ret) {
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472fdf |
- return ret;
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472fdf |
- }
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472fdf |
-
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472fdf |
- /* Detect fork / setresuid and friends */
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472fdf |
- p = getpid();
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472fdf |
- u = geteuid();
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472fdf |
- g = getegid();
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472fdf |
-
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472fdf |
- if (gpmctx->fd != -1 &&
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472fdf |
- (p != gpmctx->pid || u != gpmctx->uid || g != gpmctx->gid)) {
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472fdf |
- gpm_close_socket(gpmctx);
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472fdf |
- }
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472fdf |
-
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472fdf |
- if (gpmctx->fd == -1) {
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472fdf |
- ret = gpm_open_socket(gpmctx);
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472fdf |
- }
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472fdf |
-
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472fdf |
- if (ret) {
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472fdf |
- pthread_mutex_unlock(&gpmctx->lock);
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472fdf |
- }
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472fdf |
- return ret;
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472fdf |
-}
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472fdf |
-
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472fdf |
-static int gpm_release_sock(struct gpm_ctx *gpmctx)
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472fdf |
-{
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472fdf |
- return pthread_mutex_unlock(&gpmctx->lock);
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472fdf |
-}
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472fdf |
-
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472fdf |
-static void gpm_timer_close(struct gpm_ctx *gpmctx) {
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472fdf |
if (gpmctx->timerfd < 0) {
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472fdf |
return;
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472fdf |
}
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472fdf |
@@ -248,7 +212,59 @@ static int gpm_epoll_setup(struct gpm_ctx *gpmctx) {
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return ret;
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}
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472fdf |
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472fdf |
-static int gpm_epoll_wait(struct gpm_ctx *gpmctx, uint32_t event_flags) {
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472fdf |
+static int gpm_release_sock(struct gpm_ctx *gpmctx)
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472fdf |
+{
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472fdf |
+ gpm_epoll_close(gpmctx);
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472fdf |
+ gpm_timer_close(gpmctx);
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472fdf |
+ return pthread_mutex_unlock(&gpmctx->lock);
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472fdf |
+}
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472fdf |
+
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
472fdf |
+static int gpm_grab_sock(struct gpm_ctx *gpmctx)
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
472fdf |
+{
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
472fdf |
+ int ret;
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
472fdf |
+ pid_t p;
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
472fdf |
+ uid_t u;
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
472fdf |
+ gid_t g;
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
472fdf |
+
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
472fdf |
+ ret = pthread_mutex_lock(&gpmctx->lock);
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
472fdf |
+ if (ret) {
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
472fdf |
+ return ret;
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
472fdf |
+ }
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
472fdf |
+
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
472fdf |
+ /* Detect fork / setresuid and friends */
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
472fdf |
+ p = getpid();
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
472fdf |
+ u = geteuid();
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
472fdf |
+ g = getegid();
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
472fdf |
+
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
472fdf |
+ if (gpmctx->fd != -1 &&
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
472fdf |
+ (p != gpmctx->pid || u != gpmctx->uid || g != gpmctx->gid)) {
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
472fdf |
+ gpm_close_socket(gpmctx);
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
472fdf |
+ }
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
472fdf |
+
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
472fdf |
+ if (gpmctx->fd == -1) {
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
472fdf |
+ ret = gpm_open_socket(gpmctx);
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
472fdf |
+ if (ret) {
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
472fdf |
+ goto done;
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
472fdf |
+ }
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
472fdf |
+ }
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
472fdf |
+
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
472fdf |
+ /* setup timer */
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
472fdf |
+ ret = gpm_timer_setup(gpmctx, RESPONSE_TIMEOUT);
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
472fdf |
+ if (ret) {
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
472fdf |
+ goto done;
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
472fdf |
+ }
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
472fdf |
+ /* create epoll fd as well */
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
472fdf |
+ ret = gpm_epoll_setup(gpmctx);
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
472fdf |
+
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
472fdf |
+done:
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
472fdf |
+ if (ret) {
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
472fdf |
+ gpm_release_sock(gpmctx);
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
472fdf |
+ }
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
472fdf |
+ return ret;
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
472fdf |
+}
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
472fdf |
+
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
472fdf |
+static int gpm_epoll_wait(struct gpm_ctx *gpmctx, uint32_t event_flags)
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
472fdf |
+{
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
472fdf |
int ret;
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
472fdf |
int epoll_ret;
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
472fdf |
struct epoll_event ev;
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
472fdf |
@@ -526,11 +542,6 @@ static int gpm_send_recv_loop(struct gpm_ctx *gpmctx, char *send_buffer,
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
472fdf |
int ret;
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
472fdf |
int retry_count;
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
472fdf |
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
472fdf |
- /* setup timer */
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
472fdf |
- ret = gpm_timer_setup(gpmctx, RESPONSE_TIMEOUT);
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
472fdf |
- if (ret)
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
472fdf |
- return ret;
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
472fdf |
-
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
472fdf |
for (retry_count = 0; retry_count < MAX_TIMEOUT_RETRY; retry_count++) {
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
472fdf |
/* send to proxy */
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
472fdf |
ret = gpm_send_buffer(gpmctx, send_buffer, send_length);
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
472fdf |
@@ -757,9 +768,6 @@ int gpm_make_call(int proc, union gp_rpc_arg *arg, union gp_rpc_res *res)
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
472fdf |
}
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
472fdf |
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
472fdf |
done:
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
472fdf |
- gpm_timer_close(gpmctx);
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
472fdf |
- gpm_epoll_close(gpmctx);
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
472fdf |
-
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
472fdf |
if (sockgrab) {
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
472fdf |
gpm_release_sock(gpmctx);
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
472fdf |
}
|