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| author | Eric S. Raymond <esr@thyrsus.com> | 2011-03-25 15:01:49 -0400 |
|---|---|---|
| committer | Eric S. Raymond <esr@thyrsus.com> | 2011-03-25 15:01:49 -0400 |
| commit | a2c2a595f2588a53b7c804e688f459e8a1c5efaf (patch) | |
| tree | 687479fc101d84a38a52736bcc3e8ba3df3c4752 /gpsd.h-tail | |
| parent | 398195bc3ec704e1deb6281418bb5ed97ef7c0fe (diff) | |
| download | gpsd-a2c2a595f2588a53b7c804e688f459e8a1c5efaf.tar.gz | |
First cut at shared-memory export. Daemon-side only.
Not configured in by default yet because it produces a strange regression
failure.
Diffstat (limited to 'gpsd.h-tail')
| -rw-r--r-- | gpsd.h-tail | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/gpsd.h-tail b/gpsd.h-tail index 026bc617..f8f46b19 100644 --- a/gpsd.h-tail +++ b/gpsd.h-tail @@ -207,6 +207,11 @@ struct gps_context_t { bool shmTimePPS; # endif /* PPS_ENABLE */ #endif /* NTPSHM_ENABLE */ +#ifdef SHM_EXPORT_ENABLE + /* we don't want the compiler to treat writes to shmexport as dead code, + * and we don't want them reordered either */ + /*@reldef@*/volatile char *shmexport; +#endif }; struct aivdm_context_t { @@ -705,6 +710,18 @@ extern void ecef_to_wgs84fix(/*@out@*/struct gps_fix_t *, double, double, double); extern void clear_dop(/*@out@*/struct dop_t *); +/* shmexport.c */ +#define GPSD_KEY 0x47505344 /* "GPSD" */ +struct shmexport_t +{ + int bookend1; + struct gps_data_t gpsdata; + int bookend2; +}; +extern bool shm_acquire(struct gps_context_t *); +extern void shm_release(struct gps_context_t *); +extern void shm_update(struct gps_context_t *, struct gps_data_t *); + /* srecord.c */ extern void hexdump(size_t, unsigned char *, unsigned char *); extern unsigned char sr_sum(unsigned int, unsigned int, unsigned char *); |