Date: Wed, 21 Dec 2005 20:42:25 +0000 From: Tofik Suleymanov <tofik@oxygen.az> To: questions@freebsd.org Subject: sendmsg question Message-ID: <43A9BE31.5080102@oxygen.az>
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I get this from 'man 2 recv' :
ssize_t recvmsg(int s, struct msghdr *msg, int flags);
Where 'struct msghdr' is described in sys/socket.h like:
struct msghdr {
caddr_t msg_name; /* optional address */
u_int msg_namelen; /* size of address */
struct iovec *msg_iov; /* scatter/gather array */
u_int msg_iovlen; /* # elements in msg_iov */
caddr_t msg_control; /* ancillary data, see below */
u_int msg_controllen; /* ancillary data buffer len */
int msg_flags; /* flags on received message */
};
And where 'caddr_t msg_control' is also described in sys/socket.h like:
struct cmsghdr {
u_int cmsg_len; /* data byte count, including hdr */
int cmsg_level; /* originating protocol */
int cmsg_type; /* protocol-specific type */
/* followed by
u_char cmsg_data[]; */
};
I'm obviously missing something, but how can i get the actual data
coming from socket
using this function if 'u_char cmsg_data[]' is commented out in 'struct
cmsghdr' declaration (possibly containing incoming data?)
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