mas01cr@401: /* We could go gcc-specific here and use typeof() instead of passing
mas01cr@401:  * in an explicit type.  Answers on a postcard as to whether that's a
mas01cr@401:  * good plan or not. */
mas01cr@401: #define mmap_or_goto_error(type, var, start, length) \
mas01cr@401:   { void *tmp = mmap(0, length, PROT_READ, MAP_SHARED, adb->fd, (start)); \
mas01cr@401:     if(tmp == (void *) -1) { \
mas01cr@401:       goto error; \
mas01cr@401:     } \
mas01cr@401:     var = (type) tmp; \
mas01cr@401:   }
mas01cr@401: 
mas01cr@401: #define maybe_munmap(table, length) \
mas01cr@401:   { if(table) { \
mas01cr@401:       munmap(table, length); \
mas01cr@401:     } \
mas01cr@401:   }
mas01cr@401: 
mas01cr@401: static inline int audiodb_sync_header(adb_t *adb) {
mas01cr@401:   off_t pos;
mas01cr@401:   pos = lseek(adb->fd, (off_t) 0, SEEK_CUR);
mas01cr@401:   if(pos == (off_t) -1) {
mas01cr@401:     goto error;
mas01cr@401:   }
mas01cr@401:   if(lseek(adb->fd, (off_t) 0, SEEK_SET) == (off_t) -1) {
mas01cr@401:     goto error;
mas01cr@401:   }
mas01cr@401:   if(write(adb->fd, adb->header, O2_HEADERSIZE) != O2_HEADERSIZE) {
mas01cr@401:     goto error;
mas01cr@401:   }
mas01cr@401: 
mas01cr@401:   /* can be fsync() if fdatasync() is racily exciting and new */
mas01cr@401:   fdatasync(adb->fd);
mas01cr@401:   if(lseek(adb->fd, pos, SEEK_SET) == (off_t) -1) {
mas01cr@401:     goto error;
mas01cr@401:   }
mas01cr@401:   return 0;
mas01cr@401: 
mas01cr@401:  error:
mas01cr@401:   return 1;
mas01cr@401: }