Attachment 1283384 Details for Bug 1394862 – rpm lock check patch

[patch] rpm lock check patch

db-5.3.28-rpm-lock-check.patch (text/plain), 1.94 KB, created by Petr Kubat on 2017-05-30 10:22:57 UTC

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Creator: Petr Kubat

Created: 2017-05-30 10:22:57 UTC

Size: 1.94 KB

patch

obsolete

>diff -up db-5.3.28/src/env/env_region.c.rpm db-5.3.28/src/env/env_region.c
>--- db-5.3.28/src/env/env_region.c.rpm	2017-05-30 09:43:39.279622881 +0200
>+++ db-5.3.28/src/env/env_region.c	2017-05-30 09:43:39.280622862 +0200
>@@ -289,7 +289,8 @@ user_map_functions:
> 
> 	if (create_ok &&
> 	    __env_check_recreate(env, renv, signature) == DB_OLD_VERSION &&
>-	    (ret = ENV_PRIMARY_LOCK(env, DB_LOCK_WRITE, 1)) == 0) {
>+	    (ret = ENV_PRIMARY_LOCK(env, DB_LOCK_WRITE, 1)) == 0 &&
>+        (ret = __rpm_lock_check(env)) == 0 ) {
> 		if (FLD_ISSET(dbenv->verbose, DB_VERB_RECOVERY))
> 			__db_msg(env, "Recreating idle environment");
> 		F_SET(infop, REGION_CREATE_OK);
>diff -up db-5.3.28/src/os/os_flock.c.rpm db-5.3.28/src/os/os_flock.c
>--- db-5.3.28/src/os/os_flock.c.rpm	2017-05-30 09:43:39.278622901 +0200
>+++ db-5.3.28/src/os/os_flock.c	2017-05-30 09:59:42.345859622 +0200
>@@ -15,6 +15,46 @@ static int __os_filelocking_notsup __P((
> #endif
> 
> /*
>+ * __rpm_lock_check --
>+ *	Try to acquire and release a lock used by rpm to see
>+ *	if libdb is being updated and it is safe to access
>+ *	its environment files.
>+ */
>+
>+int __rpm_lock_check(env)
>+    ENV *env;
>+{
>+#ifdef HAVE_FCNTL
>+    struct flock info;
>+    int fd;
>+    fd = open("/var/lib/rpm/.rpm.lock", O_RDWR);
>+    if (fd == -1)
>+        return 1;
>+    /* Try to get an exclusive lock on rpm's lock file */
>+    info.l_type = F_WRLCK;
>+    info.l_whence = SEEK_SET;
>+    info.l_start = 0;
>+    info.l_len = 0;
>+    info.l_pid = 0;
>+    if (fcntl(fd, F_SETLK, &info) == -1) {
>+        close(fd);
>+        return 1;
>+    }
>+    /*
>+     * We do not want to hold the lock for the duration
>+     * of the update so release it immediately.
>+     */
>+    info.l_type = F_UNLCK;
>+    fcntl(fd, F_SETLK, &info);
>+    close(fd);
>+    return 0;
>+#else
>+    /* fcntl not supported, fail with error message */
>+    return __os_filelocking_notsup(env);
>+#endif
>+}
>+
>+/*
>  * __os_fdlock --
>  *	Acquire/release a lock on a byte in a file.
>  *

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Attachments on bug 1394862: 1279226 | 1283384 | 1284053 | 1284124 | 1287101 | 1289098 | 1289099