Porting to OS/2: Case #20 CMSG_ALIGN, CMSG_SPACE and CMSG_LEN macros

OS/2 kLIBC has been missing some control message such as CMSG_ALIGN, CMSG_SPACE and CMSG_LEN macros until 0.6.6.

They should be like this,

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#define CMSG_ALIGN( len ) _ALIGN( len ) #define CMSG_SPACE( len ) ( CMSG_ALIGN( sizeof( struct cmsghdr )) + \                             CMSG_ALIGN( len )) #define CMSG_LEN( len ) ( CMSG_ALIGN( sizeof( struct cmsghdr )) + ( len ))

Here, struct msghdr is in sys/socket.h.

See the following link for a detail.

https://github.com/komh/os2compat/blob/master/network/cmsg.h