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commit 1e9522c61c7a544d59db32cb7fbbd42e6793d848
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Author: Florian Weimer <fweimer@redhat.com>
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Date: Thu Oct 5 18:14:27 2017 +0200
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nscd: Eliminate compilation time dependency in the build output
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Reviewed-by: Carlos O'Donell <carlos@redhat.com>
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diff --git a/nscd/nscd_stat.c b/nscd/nscd_stat.c
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index d7d351c663fa6fe6..27b914aa712e7b8d 100644
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--- a/nscd/nscd_stat.c
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+++ b/nscd/nscd_stat.c
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@@ -35,9 +35,23 @@
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# include <selinux/avc.h>
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#endif /* HAVE_SELINUX */
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+/* We use this to make sure the receiver is the same. The lower 16
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+ bits are reserved for flags indicating compilation variants. This
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+ version needs to be updated if the definition of struct statdata
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+ changes. */
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+#define STATDATA_VERSION 0x01020000U
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-/* We use this to make sure the receiver is the same. */
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-static const char compilation[21] = __DATE__ " " __TIME__;
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+#ifdef HAVE_SELINUX
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+# define STATDATA_VERSION_SELINUX_FLAG 0x0001U
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+#else
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+# define STATDATA_VERSION_SELINUX_FLAG 0x0000U
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+#endif
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+
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+/* All flags affecting the struct statdata layout. */
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+#define STATDATA_VERSION_FLAGS STATDATA_VERSION_SELINUX_FLAG
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+
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+/* The full version number for struct statdata. */
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+#define STATDATA_VERSION_FULL (STATDATA_VERSION | STATDATA_VERSION_FLAGS)
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/* Statistic data for one database. */
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struct dbstat
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@@ -68,10 +82,11 @@ struct dbstat
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uintmax_t addfailed;
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};
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-/* Record for transmitting statistics. */
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+/* Record for transmitting statistics. If this definition changes,
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+ update STATDATA_VERSION above. */
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struct statdata
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{
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- char version[sizeof (compilation)];
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+ unsigned int version; /* Must be STATDATA_VERSION_FULL. */
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int debug_level;
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time_t runtime;
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unsigned long int client_queued;
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@@ -96,7 +111,7 @@ send_stats (int fd, struct database_dyn dbs[lastdb])
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memset (&data, 0, sizeof (data));
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- memcpy (data.version, compilation, sizeof (compilation));
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+ data.version = STATDATA_VERSION_FULL;
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data.debug_level = debug_level;
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data.runtime = time (NULL) - start_time;
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data.client_queued = client_queued;
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@@ -196,7 +211,7 @@ receive_print_stats (void)
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/* Read as much data as we expect. */
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if (TEMP_FAILURE_RETRY (read (fd, &data, sizeof (data))) != sizeof (data)
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- || (memcmp (data.version, compilation, sizeof (compilation)) != 0
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+ || (data.version != STATDATA_VERSION_FULL
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/* Yes, this is an assignment! */
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&& (errno = EINVAL)))
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{
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