81 struct cmsghdr {  struct
97 #define CMSG_DATA(cmsg)	((void *)((char *)(cmsg) + sizeof(struct cmsghdr)))  argument
98 #define CMSG_SPACE(len) (sizeof(struct cmsghdr) + CMSG_ALIGN(len))
99 #define CMSG_LEN(len) (sizeof(struct cmsghdr) + (len))
101 #define __CMSG_FIRSTHDR(ctl,len) ((len) >= sizeof(struct cmsghdr) ? \
102 				  (struct cmsghdr *)(ctl) : \
103 				  (struct cmsghdr *)NULL)
105 #define CMSG_OK(mhdr, cmsg) ((cmsg)->cmsg_len >= sizeof(struct cmsghdr) && \
127 static inline struct cmsghdr * __cmsg_nxthdr(void *__ctl, __kernel_size_t __size,  in __cmsg_nxthdr()
128 					       struct cmsghdr *__cmsg)  in __cmsg_nxthdr()
130 	struct cmsghdr * __ptr;  in __cmsg_nxthdr()
132 	__ptr = (struct cmsghdr*)(((unsigned char *) __cmsg) +  CMSG_ALIGN(__cmsg->cmsg_len));  in __cmsg_nxthdr()
134 		return (struct cmsghdr *)0;  in __cmsg_nxthdr()
139 static inline struct cmsghdr * cmsg_nxthdr (struct msghdr *__msg, struct cmsghdr *__cmsg)  in cmsg_nxthdr()