Fix #183: recv() returns ssize_t, not size_t

We use ECONNRESET to signal the callee of EOF.

Signed-off-by: Joachim Wiberg <troglobit@gmail.com>

src/ipc.c

@@ -171,24 +171,25 @@ int ipc_send(int sd, char *buf, size_t len)
  */
 void *ipc_receive(int sd, char *buf, size_t len)
 {
- size_t sz;
+ ssize_t sz;
 
  sz = recv(sd, buf, len - 1, 0);
- if (!sz) {
- errno = ECONNRESET;
+ if (sz <= 0)
+ if (!sz)
+ errno = ECONNRESET;
  return NULL;
  }
 
  /* successful read */
- if (sz >= sizeof(struct ipc_msg)) {
+ if ((size_t)sz >= sizeof(struct ipc_msg)) {
  struct ipc_msg *msg = (struct ipc_msg *)buf;
 
  /* Make sure to always have at least one NUL, for strlen() */
  buf[sz] = 0;
 
- if (sz == msg->len) {
- char *ptr;
+ if ((size_t)sz == msg->len) {
  size_t i, count;
+ char *ptr;
 
  /* Upper bound: smcroutectl add in1 source group out1 out2 .. out32 */
  count = msg->count;