You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
106 lines
2.9 KiB
106 lines
2.9 KiB
2 years ago
|
From 896b3694ca062d747cd67e9e9ba246adb3fc706b Mon Sep 17 00:00:00 2001
|
||
|
|
From: =?UTF-8?q?Ond=C5=99ej=20Lyson=C4=9Bk?= <olysonek@redhat.com>
|
||
|
|
Date: Mon, 5 Aug 2019 13:55:37 +0200
|
||
|
|
Subject: [PATCH 2/2] Repeat pututxline() if it fails with EINTR
|
||
|
|
|
||
|
|
This is a partial fix for rhbz#1688848. We cannot resolve it
|
||
|
|
completely until glibc bug rhbz#1734791 is fixed. See
|
||
|
|
https://bugzilla.redhat.com/show_bug.cgi?id=1688848#c13.
|
||
|
|
|
||
|
|
The maximum number of attempts is currently 2, which might seem
|
||
|
|
low. However setting it to 2 was a decision based on data - see
|
||
|
|
https://bugzilla.redhat.com/show_bug.cgi?id=1688848#c16.
|
||
|
|
|
||
|
|
Resolves: rhbz#1688848
|
||
|
|
---
|
||
|
|
sysdeputil.c | 53 +++++++++++++++++++++++++++++++++++++++++++++-------
|
||
|
|
1 file changed, 46 insertions(+), 7 deletions(-)
|
||
|
|
|
||
|
|
diff --git a/sysdeputil.c b/sysdeputil.c
|
||
|
|
index bd1e8c9..4fbcca7 100644
|
||
|
|
--- a/sysdeputil.c
|
||
|
|
+++ b/sysdeputil.c
|
||
|
|
@@ -1203,6 +1203,8 @@ void
|
||
|
|
vsf_insert_uwtmp(const struct mystr* p_user_str,
|
||
|
|
const struct mystr* p_host_str)
|
||
|
|
{
|
||
|
|
+ int attempts;
|
||
|
|
+
|
||
|
|
if (sizeof(s_utent.ut_line) < 16)
|
||
|
|
{
|
||
|
|
return;
|
||
|
|
@@ -1231,16 +1233,35 @@ vsf_insert_uwtmp(const struct mystr* p_user_str,
|
||
|
|
vsf_sysutil_strcpy(s_utent.ut_host, str_getbuf(p_host_str),
|
||
|
|
sizeof(s_utent.ut_host));
|
||
|
|
s_utent.ut_tv.tv_sec = vsf_sysutil_get_time_sec();
|
||
|
|
- setutxent();
|
||
|
|
- (void) pututxline(&s_utent);
|
||
|
|
- endutxent();
|
||
|
|
- s_uwtmp_inserted = 1;
|
||
|
|
+ for (attempts = 2; attempts > 0; --attempts)
|
||
|
|
+ {
|
||
|
|
+ struct utmpx* p_res;
|
||
|
|
+ setutxent();
|
||
|
|
+ p_res = pututxline(&s_utent);
|
||
|
|
+ /* For now we'll ignore errors other than EINTR and EAGAIN */
|
||
|
|
+ if (p_res != NULL || (errno != EINTR && errno != EAGAIN))
|
||
|
|
+ {
|
||
|
|
+ break;
|
||
|
|
+ }
|
||
|
|
+ }
|
||
|
|
+ if (attempts == 0)
|
||
|
|
+ {
|
||
|
|
+ /* This makes us skip pututxline() in vsf_remove_uwtmp() */
|
||
|
|
+ s_uwtmp_inserted = -1;
|
||
|
|
+ }
|
||
|
|
+ else
|
||
|
|
+ {
|
||
|
|
+ s_uwtmp_inserted = 1;
|
||
|
|
+ endutxent();
|
||
|
|
+ }
|
||
|
|
updwtmpx(WTMPX_FILE, &s_utent);
|
||
|
|
}
|
||
|
|
|
||
|
|
void
|
||
|
|
vsf_remove_uwtmp(void)
|
||
|
|
{
|
||
|
|
+ int attempts;
|
||
|
|
+
|
||
|
|
if (!s_uwtmp_inserted)
|
||
|
|
{
|
||
|
|
return;
|
||
|
|
@@ -1249,9 +1270,27 @@ vsf_remove_uwtmp(void)
|
||
|
|
vsf_sysutil_memclr(s_utent.ut_user, sizeof(s_utent.ut_user));
|
||
|
|
vsf_sysutil_memclr(s_utent.ut_host, sizeof(s_utent.ut_host));
|
||
|
|
s_utent.ut_tv.tv_sec = 0;
|
||
|
|
- setutxent();
|
||
|
|
- (void) pututxline(&s_utent);
|
||
|
|
- endutxent();
|
||
|
|
+ if (s_uwtmp_inserted == 1)
|
||
|
|
+ {
|
||
|
|
+ for (attempts = 2; attempts > 0; --attempts)
|
||
|
|
+ {
|
||
|
|
+ struct utmpx* p_res;
|
||
|
|
+ setutxent();
|
||
|
|
+ p_res = pututxline(&s_utent);
|
||
|
|
+ /* For now we'll ignore errors other than EINTR and EAGAIN */
|
||
|
|
+ if (p_res != NULL || (errno != EINTR && errno != EAGAIN))
|
||
|
|
+ {
|
||
|
|
+ break;
|
||
|
|
+ }
|
||
|
|
+ }
|
||
|
|
+ if (attempts != 0)
|
||
|
|
+ {
|
||
|
|
+ endutxent();
|
||
|
|
+ }
|
||
|
|
+ }
|
||
|
|
+ /* Set s_uwtmp_inserted to 0 regardless of the result of
|
||
|
|
+ * pututxline() to make sure we won't run this function twice.
|
||
|
|
+ */
|
||
|
|
s_uwtmp_inserted = 0;
|
||
|
|
s_utent.ut_tv.tv_sec = vsf_sysutil_get_time_sec();
|
||
|
|
updwtmpx(WTMPX_FILE, &s_utent);
|
||
|
|
--
|
||
|
|
2.20.1
|
||
|
|
|