Macros starting with `b' in sys

• B_ADAPTOR sys/reboot.h:71
• B_CONTROLLER sys/reboot.h:74
• binshash sys/buf.h:191
• binsheadfree sys/buf.h:205
• binstailfree sys/buf.h:211
• B_PARTITION sys/reboot.h:80
• bremfree sys/buf.h:201
• bremhash sys/buf.h:187
• btokmemx sys/malloc.h:231
• btokup sys/malloc.h:232
• B_TYPE sys/reboot.h:83
• BUCKETINDX sys/malloc.h:194
• BUFHASH sys/buf.h:119
• B_UNIT sys/reboot.h:77