pSOSystem System Calls - Read

pNA+ System Calls recvmsg
recvmsg Receives data from a socket.
#include
long recvmsg(
int s, /* socket descriptor */
struct msghdr *msg, /* packet */
int flags /* packet attributes */
)
Description
Arguments
The recvmsg() system call is used to receive data from a socket. This system call is
similar to recvfrom() but requires fewer input parameters. Refer also to recv()
for more details. Note that the MSG_RAWMEM option is not supported by this call.
s Specifies the socket from which data is received. The behavior of the
system call depends on the socket type. Refer to recv() for more information.
msg Points to the structure msghdr, which is defined in the file
with the following format:
struct msghdr {
char *msg_name; /* optional address */
int msg_namelen; /* size of address */
struct iovec *msg_iov; /* scatter/gather array */
int msg_iovlen; /* # elements in msg_iov */
char *msg_accrights; /* access rights */
int msg_accrightslen; /* size of access rights buffer */
};
This structure cannot be packed. The contents of the msghdr fields
are described below.
msg_name If the socket is unconnected, can specify the
source from which it receives data.
msg_namelen Specifies the length of the buffer pointed to by
msg_name.
pSOSystem System Calls 4-51
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