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(CMSG_ALIGN): Define.

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(__cmsg_nxthdr): Use CMSG_ALIGN (fixes a bug) and correct test for availability
of another entry.
This commit is contained in:
Ulrich Drepper 1998-09-28 11:48:04 +00:00
parent 14e6f66eb1
commit 55b375e391
1 changed files with 12 additions and 6 deletions
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18
sysdeps/unix/sysv/linux/socketbits.h
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@ -184,6 +184,11 @@ struct cmsghdr
#define CMSG_FIRSTHDR(mhdr) \
((size_t) (mhdr)->msg_controllen >= sizeof (struct cmsghdr) \
? (struct cmsghdr *) (mhdr)->msg_control : (struct cmsghdr *) NULL)
#define CMSG_ALIGN(len) (((len) + sizeof (size_t) - 1) \
& ~(sizeof (size_t) - 1))
#define CMSG_SPACE(len) (CMSG_ALIGN (len) \
+ CMSG_ALIGN (sizeof (struct cmsghdr)))
#define CMSG_LEN(len) (CMSG_ALIGN (sizeof (struct cmsghdr)) + (len))
#ifndef _EXTERN_INLINE
@ -194,18 +199,19 @@ extern struct cmsghdr *__cmsg_nxthdr __P ((struct msghdr *__mhdr,
_EXTERN_INLINE struct cmsghdr *
__cmsg_nxthdr (struct msghdr *__mhdr, struct cmsghdr *__cmsg)
{
unsigned char *__p;
if ((size_t) __cmsg->cmsg_len < sizeof (struct cmsghdr))
/* The kernel header does this so there may be a reason. */
return NULL;
__p = (((unsigned char *) __cmsg)
+ ((__cmsg->cmsg_len + sizeof (long int) - 1) & ~sizeof (long int)));
if (__p >= (unsigned char *) __mhdr->msg_control + __mhdr->msg_controllen)
__cmsg = (struct cmsghdr *) ((unsigned char *) __cmsg
+ CMSG_ALIGN (__cmsg->cmsg_len));
if ((unsigned char *) (__cmsg + 1) >= ((unsigned char *) __mhdr->msg_control
+ __mhdr->msg_controllen)
|| ((unsigned char *) __cmsg + CMSG_ALIGN (__cmsg->cmsg_len)
>= ((unsigned char *) __mhdr->msg_control + __mhdr->msg_controllen)))
/* No more entries. */
return NULL;
return (struct cmsghdr *) __p;
return __cmsg;
}
/* Socket level message types. This must match the definitions in