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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>
This commit is contained in:
Florian Weimer 2017-10-05 18:14:27 +02:00
parent 644d38570a
commit 1e9522c61c
2 changed files with 32 additions and 6 deletions
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11
ChangeLog
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@ -1,3 +1,14 @@
2017-10-05 Florian Weimer <fweimer@redhat.com>
nscd: Eliminate compilation time dependency in the build output.
* nscd/nscd_stat.c (STATDATA_VERSION)
(STATDATA_VERSION_SELINUX_FLAG, STATDATA_VERSION_FLAGS)
(STATDATA_VERSION_FULL): New macro definitions.
(compilation): Remove.
(struct statdata): Adjust version member.
(send_stats): Set version from STATDATA_VERSION_FULL.
(receive_print_stats): Verify version against STATDATA_VERSION_FULL.
2017-10-05 Joseph Myers <joseph@codesourcery.com>
* configure.ac (--enable-add-ons): Remove option.

27
nscd/nscd_stat.c
View File

@ -35,9 +35,23 @@
# include <selinux/avc.h>
#endif /* HAVE_SELINUX */
/* We use this to make sure the receiver is the same. The lower 16
bits are reserved for flags indicating compilation variants. This
version needs to be updated if the definition of struct statdata
changes. */
#define STATDATA_VERSION 0x01020000U
/* We use this to make sure the receiver is the same. */
static const char compilation[21] = __DATE__ " " __TIME__;
#ifdef HAVE_SELINUX
# define STATDATA_VERSION_SELINUX_FLAG 0x0001U
#else
# define STATDATA_VERSION_SELINUX_FLAG 0x0000U
#endif
/* All flags affecting the struct statdata layout. */
#define STATDATA_VERSION_FLAGS STATDATA_VERSION_SELINUX_FLAG
/* The full version number for struct statdata. */
#define STATDATA_VERSION_FULL (STATDATA_VERSION | STATDATA_VERSION_FLAGS)
/* Statistic data for one database. */
struct dbstat
@ -68,10 +82,11 @@ struct dbstat
uintmax_t addfailed;
};
/* Record for transmitting statistics. */
/* Record for transmitting statistics. If this definition changes,
update STATDATA_VERSION above. */
struct statdata
{
char version[sizeof (compilation)];
unsigned int version; /* Must be STATDATA_VERSION_FULL. */
int debug_level;
time_t runtime;
unsigned long int client_queued;
@ -96,7 +111,7 @@ send_stats (int fd, struct database_dyn dbs[lastdb])
memset (&data, 0, sizeof (data));
memcpy (data.version, compilation, sizeof (compilation));
data.version = STATDATA_VERSION_FULL;
data.debug_level = debug_level;
data.runtime = time (NULL) - start_time;
data.client_queued = client_queued;
@ -196,7 +211,7 @@ receive_print_stats (void)
/* Read as much data as we expect. */
if (TEMP_FAILURE_RETRY (read (fd, &data, sizeof (data))) != sizeof (data)
|| (memcmp (data.version, compilation, sizeof (compilation)) != 0
|| (data.version != STATDATA_VERSION_FULL
/* Yes, this is an assignment! */
&& (errno = EINVAL)))
{