Macros starting with `p' in bsd/sys

• pack bsd/sys/trace.h:133
• pcred_readlock bsd/sys/proc.h:302
• pcred_unlock bsd/sys/proc.h:306
• pcred_writelock bsd/sys/proc.h:304
• PGRPHASH bsd/sys/proc.h:327
• pgsigio bsd/sys/signalvar.h:93
• PIDHASH bsd/sys/proc.h:323
• powerof2 bsd/sys/param.h:208
• PRC_IS_REDIRECT bsd/sys/protosw.h:315
• __PROJECT_VERSION bsd/sys/cdefs.h:162