Switch io_close(), io_input() from timeouts to deadlines

All users want deadlines.  Move the conversion from deadline to
timeout from callers to io.c, where it becoems an implementation
detail.

include/empio.h

@@ -32,7 +32,7 @@
 
 #ifndef EMPIO_H
 #define EMPIO_H
-#include <sys/time.h>
+#include <time.h>
 
 #define IO_READ		0x1
 #define IO_WRITE	0x2
@@ -43,9 +43,8 @@
 
 extern struct iop *io_open(int, int, int);
 extern void io_init(void);
-extern void io_close(struct iop *, struct timeval *);
-extern void io_timeout(struct timeval *, time_t);
-extern int io_input(struct iop *, struct timeval *);
+extern void io_close(struct iop *, time_t);
+extern int io_input(struct iop *, time_t);
 extern int io_inputwaiting(struct iop *);
 extern int io_outputwaiting(struct iop *);
 extern int io_output(struct iop *, int);

src/lib/empthread/io.c

@@ -65,6 +65,8 @@ struct iop {
     int last_out;
 };
 
+static struct timeval *io_timeout(struct timeval *, time_t);
+
 void
 io_init(void)
 {
@@ -104,14 +106,16 @@ io_open(int fd, int flags, int bufsize)
 }
 
 void
-io_close(struct iop *iop, struct timeval *timeout)
+io_close(struct iop *iop, time_t deadline)
 {
+    struct timeval timeout;
     char buf[IO_BUFSIZE];
     int ret;
 
     while (io_output(iop, 1) > 0) ;
     shutdown(iop->fd, SHUT_WR);
-    while (empth_select(iop->fd, EMPTH_FD_READ, timeout) > 0) {
+    while (empth_select(iop->fd, EMPTH_FD_READ,
+			io_timeout(&timeout, deadline)) > 0) {
 	ret = read(iop->fd, buf, sizeof(buf));
 	if (ret <= 0)
 	    break;
@@ -124,11 +128,14 @@ io_close(struct iop *iop, struct timeval *timeout)
     free(iop);
 }
 
-void
+static struct timeval *
 io_timeout(struct timeval *timeout, time_t deadline)
 {
     struct timeval now;
 
+    if (deadline == (time_t)-1)
+	return NULL;		/* no deadline */
+
     gettimeofday(&now, NULL);
     if (now.tv_sec >= deadline) {
 	/* deadline reached already */
@@ -140,20 +147,24 @@ io_timeout(struct timeval *timeout, time_t deadline)
 	timeout->tv_usec = 999999 - now.tv_usec;
 	/* yes, this is 1usec early; sue me */
     }
+
+    return timeout;
 }
 
 /*
  * Read input from IOP and enqueue it.
- * If TIMEOUT is non-null, wait at most that long for input to arrive.
- * Does not yield the processor when timeout is zero.
+ * Wait at most until DEADLINE for input to arrive.  (time_t)-1 means
+ * wait as long as it takes (no timeout).
+ * Does not yield the processor when DEADLINE is zero.
  * A wait for input can be cut short by empth_wakeup().
  * Return number of bytes read on success, -1 on error.
  * In particular, return zero on timeout, early wakeup or EOF.  Use
  * io_eof() to distinguish timeout and early wakeup from EOF.
  */
 int
-io_input(struct iop *iop, struct timeval *timeout)
+io_input(struct iop *iop, time_t deadline)
 {
+    struct timeval timeout;
     char buf[IO_BUFSIZE];
     int cc;
     int res;
@@ -165,8 +176,9 @@ io_input(struct iop *iop, struct timeval *timeout)
     if (iop->flags & IO_EOF)
 	return 0;
 
-    if (!timeout || timeout->tv_sec || timeout->tv_usec) {
-	res = empth_select(iop->fd, EMPTH_FD_READ, timeout);
+    if (deadline) {
+	res = empth_select(iop->fd, EMPTH_FD_READ,
+			   io_timeout(&timeout, deadline));
 	if (res < 0) {
 	    iop->flags |= IO_ERROR;
 	    return -1;

src/lib/player/accept.c

@@ -95,13 +95,11 @@ player_new(int s)
 struct player *
 player_delete(struct player *lp)
 {
-    struct timeval timeout;
     struct player *back;
 
     if (lp->iop) {
 	/* it's a real player */
-	io_timeout(&timeout, player->curup + minutes(max_idle));
-	io_close(lp->iop, &timeout);
+	io_close(lp->iop, player->curup + minutes(max_idle));
 	lp->iop = NULL;
     }
     back = (struct player *)lp->queue.q_back;

src/lib/player/login.c

@@ -76,7 +76,6 @@ static struct cmndstr login_coms[] = {
 void
 player_login(void *ud)
 {
-    struct timeval timeout;
     char buf[128];
     char space[128];
     int ac;
@@ -90,8 +89,7 @@ player_login(void *ud)
     for (;;) {
 	io_output(player->iop, 1);
 	if (io_gets(player->iop, buf, sizeof(buf)) < 0) {
-	    io_timeout(&timeout, player->curup + minutes(max_idle));
-	    res = io_input(player->iop, &timeout);
+	    res = io_input(player->iop, player->curup + minutes(max_idle));
 	    if (res <= 0) {
 		if (res == 0 && !io_eof(player->iop))
 		    pr_id(player, C_DATA, "idle connection terminated\n");

src/lib/player/recvclient.c

@@ -61,7 +61,6 @@ int
 recvclient(char *cmd, int size)
 {
     int count, res;
-    struct timeval timeout;
 
     count = -1;
     while (!player->aborted) {
@@ -92,8 +91,7 @@ recvclient(char *cmd, int size)
 	if (player->aborted)
 	    break;
 
-	io_timeout(&timeout, player->curup + minutes(max_idle));
-	res = io_input(player->iop, &timeout);
+	res = io_input(player->iop, player->curup + minutes(max_idle));
 	if (res > 0)
 	    ;
 	else if (res < 0)