void tcpflush(tcpsock s, int64_t deadline) {
if(s->type != MILL_TCPCONN)
mill_panic("trying to send to an unconnected socket");
struct mill_tcpconn *conn = (struct mill_tcpconn*)s;
if(!conn->olen) {
errno = 0;
return;
}
char *pos = conn->obuf;
size_t remaining = conn->olen;
while(remaining) {
ssize_t sz = send(conn->fd, pos, remaining, 0);
if(sz == -1) {
if(errno != EAGAIN && errno != EWOULDBLOCK)
return;
int rc = mill_fdwait(conn->fd, FDW_OUT, deadline);
if(rc == 0) {
errno = ETIMEDOUT;
return;
}
mill_assert(rc == FDW_OUT);
continue;
}
pos += sz;
remaining -= sz;
}
conn->olen = 0;
errno = 0;
}
tcpsock tcpaccept(tcpsock s, int64_t deadline) {
if(s->type != MILL_TCPLISTENER)
mill_panic("trying to accept on a socket that isn't listening");
struct mill_tcplistener *l = (struct mill_tcplistener*)s;
while(1) {
/* Try to get new connection (non-blocking). */
int as = accept(l->fd, NULL, NULL);
if (as >= 0) {
mill_tcptune(as);
struct mill_tcpconn *conn = malloc(sizeof(struct mill_tcpconn));
if(!conn) {
close(as);
errno = ENOMEM;
return NULL;
}
tcpconn_init(conn, as);
errno = 0;
return (tcpsock)conn;
}
mill_assert(as == -1);
if(errno != EAGAIN && errno != EWOULDBLOCK)
return NULL;
/* Wait till new connection is available. */
int rc = mill_fdwait(l->fd, FDW_IN, deadline);
if(rc == 0) {
errno = ETIMEDOUT;
return NULL;
}
mill_assert(rc == FDW_IN);
}
}
/* Pause current coroutine for a specified time interval. */
void mill_msleep(long ms, const char *current) {
/* No point in waiting. Still, let's give other coroutines a chance. */
if(ms <= 0) {
yield();
return;
}
/* Do the actual waiting. */
mill_fdwait(-1, 0, ms, current);
}
size_t tcpsend(tcpsock s, const void *buf, size_t len, int64_t deadline) {
if(s->type != MILL_TCPCONN)
mill_panic("trying to send to an unconnected socket");
struct mill_tcpconn *conn = (struct mill_tcpconn*)s;
/* If it fits into the output buffer copy it there and be done. */
if(conn->olen + len <= MILL_TCP_BUFLEN) {
memcpy(&conn->obuf[conn->olen], buf, len);
conn->olen += len;
errno = 0;
return len;
}
/* If it doesn't fit, flush the output buffer first. */
tcpflush(s, deadline);
if(errno != 0)
return 0;
/* Try to fit it into the buffer once again. */
if(conn->olen + len <= MILL_TCP_BUFLEN) {
memcpy(&conn->obuf[conn->olen], buf, len);
conn->olen += len;
errno = 0;
return len;
}
/* The data chunk to send is longer than the output buffer.
Let's do the sending in-place. */
char *pos = (char*)buf;
size_t remaining = len;
while(remaining) {
ssize_t sz = send(conn->fd, pos, remaining, 0);
if(sz == -1) {
if(errno != EAGAIN && errno != EWOULDBLOCK)
return 0;
int rc = mill_fdwait(conn->fd, FDW_OUT, deadline);
if(rc == 0) {
errno = ETIMEDOUT;
return len - remaining;
}
mill_assert(rc == FDW_OUT);
continue;
}
pos += sz;
remaining -= sz;
}
return len;
}
tcpsock tcpconnect(ipaddr addr, int64_t deadline) {
/* Open a socket. */
int s = socket(mill_ipfamily(addr), SOCK_STREAM, 0);
if(s == -1)
return NULL;
mill_tcptune(s);
/* Connect to the remote endpoint. */
int rc = connect(s, (struct sockaddr*)&addr, mill_iplen(addr));
if(rc != 0) {
mill_assert(rc == -1);
if(errno != EINPROGRESS)
return NULL;
rc = mill_fdwait(s, FDW_OUT, deadline);
if(rc == 0) {
errno = ETIMEDOUT;
return NULL;
}
int err;
socklen_t errsz = sizeof(err);
rc = getsockopt(s, SOL_SOCKET, SO_ERROR, (void*)&err, &errsz);
if(rc != 0) {
err = errno;
close(s);
errno = err;
return NULL;
}
if(err != 0) {
close(s);
errno = err;
return NULL;
}
}
/* Create the object. */
struct mill_tcpconn *conn = malloc(sizeof(struct mill_tcpconn));
if(!conn) {
close(s);
errno = ENOMEM;
return NULL;
}
tcpconn_init(conn, s);
errno = 0;
return (tcpsock)conn;
}
/* Pause current coroutine for a specified time interval. */
void mill_msleep(int64_t deadline, const char *current) {
mill_fdwait(-1, 0, deadline, current);
}
size_t tcprecvlh(tcpsock s, void *buf, size_t lowwater, size_t highwater, int64_t deadline) {
if(s->type != MILL_TCPCONN)
mill_panic("trying to receive from an unconnected socket");
struct mill_tcpconn *conn = (struct mill_tcpconn*)s;
/* The buffer is between lowwater and highwater. */
if(conn->ilen >= lowwater && conn->ilen <= highwater) {
memcpy(buf, &conn->ibuf[conn->ifirst], conn->ilen);
conn->ifirst = 0;
conn->ilen = 0;
errno = 0;
return conn->ilen;
}
/* The buffer is above the highwater. */
if(conn->ilen >= highwater) {
memcpy(buf, &conn->ibuf[conn->ifirst], highwater);
conn->ifirst += highwater;
conn->ilen -= highwater;
errno = 0;
return highwater;
}
/* The buffer is below the lowwater. */
/* Let's move all the data from the buffer first. */
char *pos = (char*)buf;
size_t remaining = highwater;
memcpy(pos, &conn->ibuf[conn->ifirst], conn->ilen);
pos += conn->ilen;
remaining -= conn->ilen;
conn->ifirst = 0;
conn->ilen = 0;
mill_assert(remaining);
while(1) {
if(remaining > MILL_TCP_BUFLEN) {
/* If we still have a lot to read try to read it in one go directly
into the destination buffer. */
ssize_t sz = recv(conn->fd, pos, remaining, 0);
if(!sz) {
errno = ECONNRESET;
return highwater - remaining;
}
if(sz == -1) {
if(errno != EAGAIN && errno != EWOULDBLOCK)
return highwater - remaining;
sz = 0;
}
if(highwater - remaining + (size_t)sz >= lowwater) {
errno = 0;
return highwater - remaining + (size_t)sz;
}
pos += sz;
remaining -= sz;
}
else {
/* If we have just a little to read try to read the full connection
buffer to minimise the number of system calls. */
ssize_t sz = recv(conn->fd, conn->ibuf, MILL_TCP_BUFLEN, 0);
if(!sz) {
errno = ECONNRESET;
return highwater - remaining;
}
if(sz == -1) {
if(errno != EAGAIN && errno != EWOULDBLOCK)
return highwater - remaining;
sz = 0;
}
if(highwater - remaining + (size_t)sz < lowwater) {
memcpy(pos, conn->ibuf, sz);
pos += sz;
remaining -= sz;
conn->ifirst = 0;
conn->ilen = 0;
}
else {
memcpy(pos, conn->ibuf, remaining);
conn->ifirst = remaining;
conn->ilen = sz - remaining;
errno = 0;
return highwater - remaining + (size_t)sz;
}
}
/* Wait till there's more data to read. */
int res = mill_fdwait(conn->fd, FDW_IN, deadline);
if(!res) {
errno = ETIMEDOUT;
return highwater - remaining;
}
}
}