gint system_pipe2(gint pipefds[2], gint flags) {
/* we only support non-blocking sockets, and require
* SOCK_NONBLOCK to be set immediately */
gboolean isBlocking = TRUE;
/* clear non-blocking flags if set to get true type */
if(flags & O_NONBLOCK) {
flags = flags & ~O_NONBLOCK;
isBlocking = FALSE;
}
if(flags & O_CLOEXEC) {
flags = flags & ~O_CLOEXEC;
isBlocking = FALSE;
}
/* check inputs for what we support */
if(isBlocking) {
warning("we only support non-blocking pipes: please bitwise OR 'O_NONBLOCK' with flags");
errno = EINVAL;
return -1;
}
Node* node = _system_switchInShadowContext();
gint handle = node_createDescriptor(node, DT_PIPE);
Channel* channel = (Channel*) node_lookupDescriptor(node, handle);
gint linkedHandle = channel_getLinkedHandle(channel);
_system_switchOutShadowContext(node);
pipefds[0] = handle; /* reader */
pipefds[1] = linkedHandle; /* writer */
return 0;
}
gint system_socketPair(gint domain, gint type, gint protocol, gint fds[2]) {
/* create a pair of connected sockets, i.e. a bi-directional pipe */
if(domain != AF_UNIX) {
errno = EAFNOSUPPORT;
return -1;
}
/* only support non-blocking sockets */
gboolean isBlocking = FALSE;
/* clear non-blocking flags if set to get true type */
gint realType = type;
if(realType & SOCK_NONBLOCK) {
realType = realType & ~SOCK_NONBLOCK;
isBlocking = FALSE;
}
if(realType & SOCK_CLOEXEC) {
realType = realType & ~SOCK_CLOEXEC;
isBlocking = FALSE;
}
if(realType != SOCK_STREAM) {
errno = EPROTONOSUPPORT;
return -1;
}
gint result = 0;
Host* node = _system_switchInShadowContext();
if(isBlocking) {
warning("we only support non-blocking sockets: please bitwise OR 'SOCK_NONBLOCK' with type flags");
errno = EPROTONOSUPPORT;
result = -1;
}
if(result == 0) {
gint handle = host_createDescriptor(node, DT_SOCKETPAIR);
Channel* channel = (Channel*) host_lookupDescriptor(node, handle);
gint linkedHandle = channel_getLinkedHandle(channel);
fds[0] = handle;
fds[1] = linkedHandle;
}
_system_switchOutShadowContext(node);
return result;
}
