Macros starting with 'c' in sys

• claligned sys/param.h:123
• clbase sys/param.h:128
• clrbit sys/param.h:169
• clrbuf sys/buf.h:219
• clrnd sys/param.h:129
• CLRSIG sys/signalvar.h:89
• cltom sys/mbuf.h:65
• CMDBUF sys/sgio.h:147
• CMSG_DATA sys/socket.h:202
• CMSG_FIRSTHDR sys/socket.h:211
• CMSG_NXTHDR sys/socket.h:205
• __CONCAT sys/cdefs.h:60
• crhold sys/ucred.h:53
• CTRL sys/ttydefaults.h:55
• CURSIG sys/signalvar.h:81