src/sys/sys/socket.h - diff

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version 1.49, 2000/02/03 09:23:03

version 1.50, 2000/02/18 05:19:25

Line 396 struct cmsghdr {

};

/* given pointer to struct cmsghdr, return pointer to data */

#define CMSG_DATA(cmsg) ((u_char *)((cmsg) + 1))

#define CMSG_DATA(cmsg) \

((u_char *)(cmsg) + CMSG_ALIGN(sizeof(struct cmsghdr)))

* Alignment requirement for CMSG struct manipulation.

* This is different from ALIGN() defined in ARCH/include/param.h.

* XXX think again carefully about architecture dependencies.

#define CMSG_ALIGN(n) (((n) + 3) & ~3)

#define CMSG_ALIGN(n) (((n) + (sizeof(long) - 1)) & ~(sizeof(long) - 1))

/* given pointer to struct cmsghdr, return pointer to next cmsghdr */

#define CMSG_NXTHDR(mhdr, cmsg) \

(((caddr_t)(cmsg) + (cmsg)->cmsg_len + sizeof(struct cmsghdr) > \

(((caddr_t)(cmsg) + CMSG_ALIGN((cmsg)->cmsg_len) + \

CMSG_ALIGN(sizeof(struct cmsghdr)) > \

(((caddr_t)(mhdr)->msg_control) + (mhdr)->msg_controllen)) ? \

(struct cmsghdr *)NULL : \

(struct cmsghdr *)((caddr_t)(cmsg) + CMSG_ALIGN((cmsg)->cmsg_len)))