minix/lib/libc/ip/recvmsg.c

95 lines
1.7 KiB
C

#undef NDEBUG
#include <errno.h>
#include <net/ioctl.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <sys/un.h>
#define DEBUG 0
static ssize_t _uds_recvmsg_conn(int socket, struct msghdr *msg, int flags);
static ssize_t _uds_recvmsg_dgram(int socket, struct msghdr *msg, int flags);
ssize_t recvmsg(int socket, struct msghdr *msg, int flags)
{
int r;
int uds_sotype;
if (msg == NULL) {
errno= EFAULT;
return -1;
}
r= ioctl(socket, NWIOGUDSSOTYPE, &uds_sotype);
if (r != -1 || (errno != ENOTTY && errno != EBADIOCTL))
{
if (r == -1) {
return r;
}
if (uds_sotype == SOCK_DGRAM) {
return _uds_recvmsg_dgram(socket, msg, flags);
} else {
return _uds_recvmsg_conn(socket, msg, flags);
}
}
#if DEBUG
fprintf(stderr, "recvmsg: not implemented for fd %d\n", socket);
#endif
errno= ENOSYS;
return -1;
}
static ssize_t _uds_recvmsg_conn(int socket, struct msghdr *msg, int flags)
{
int r;
if (flags != 0) {
#if DEBUG
fprintf(stderr, "recvmsg(uds): flags not implemented\n");
#endif
errno= ENOSYS;
return -1;
}
r = readv(socket, msg->msg_iov, msg->msg_iovlen);
if (r >= 0 && msg->msg_name && msg->msg_namelen > 0)
{
getpeername(socket, msg->msg_name, &msg->msg_namelen);
}
msg->msg_flags = 0;
return r;
}
static ssize_t _uds_recvmsg_dgram(int socket, struct msghdr *msg, int flags)
{
int r;
if (flags != 0) {
#if DEBUG
fprintf(stderr, "recvmsg(uds): flags not implemented\n");
#endif
errno= ENOSYS;
return -1;
}
r = readv(socket, msg->msg_iov, msg->msg_iovlen);
if (r >= 0 && msg->msg_name && msg->msg_namelen > 0)
{
ioctl(socket, NWIOGUDSFADDR, msg->msg_name);
msg->msg_namelen= sizeof(struct sockaddr_un);
}
msg->msg_flags = 0;
return r;
}