diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/socketbits.h')
| -rw-r--r-- | sysdeps/unix/sysv/linux/socketbits.h | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/socketbits.h b/sysdeps/unix/sysv/linux/socketbits.h index 1cf44b4347..91deb6c815 100644 --- a/sysdeps/unix/sysv/linux/socketbits.h +++ b/sysdeps/unix/sysv/linux/socketbits.h @@ -126,6 +126,47 @@ struct msghdr int msg_flags; /* Flags on received message. */ }; +/* Structure used for storage of ancillary data object information. */ +struct cmsghdr + { + int cmsg_len; /* Length of data in cmsg_data plus length + of cmsghdr structure. */ + /* XXX Should be type `size_t' according to POSIX.1g. */ + int cmsg_level; /* Originating protocol. */ + int cmsg_type; /* Protocol specific type. */ + unsigned char __cmsg_data[0]; /* Ancillary data. */ + }; + +/* Ancillary data object manipulation macros. */ +#define CMSG_DATA(cmsg) ((cmsg)->__cmsg_data) +#define CMSG_NXTHDR(mhdr, cmsg) __cmsg_nxthdr (mhdr, cmsg) +#define CMSG_FIRSTHDR(mhdr) (mhdr) \ + ((size_t) (mhdr)->msg_controllen >= sizeof (struct cmsghdr) \ + ? (struct cmsghdr *) (mhdr)->msg_control : (struct cmsghdr *) NULL) + + +#ifndef _EXTERN_INLINE +# define _EXTERN_INLINE extern __inline +#endif +extern struct cmsghdr *__cmsg_nxthdr __P ((struct msghdr *__mhdr, + struct cmsghdr *__cmsg)); +_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) + /* No more entries. */ + return NULL; + return (struct cmsghdr *) __p; +} + /* Get socket manipulation related informations from kernel headers. */ #include <asm/socket.h> |