lib: Don't use pointer to set FRCT flags

The fccntl call FRCTSFLAGS was using a pointer to a flags so set
flags, which should just be a regular uint16_t.

For instance, the FRCTLINGER flags can now be turned off using

fccntl(fd, FRCTSFLAGS, FRCTFRESCNTL | FRCTFRTX)

leaving only resource control (flow control, FRCTFRESCNTL) and
retransmission enabled. Note that retransmission (FRCTFRTX) can't be
enabled or disabled on a live flow, it will be set on flow allocation.

Updates the man page for fccntl to add these FRCT options.

Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks>
Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>

3 files changed, 18 insertions, 13 deletions

diff --git a/doc/man/fccntl.3 b/doc/man/fccntl.3
index 492cff46..c4706708 100644
--- a/doc/man/fccntl.3
+++ b/doc/man/fccntl.3
@@ -40,8 +40,8 @@ disables the timeout.
 \fBFLOWGQOSSPEC\fR  - retrieve the current QoS specification of the
 flow. Takes a \fBqosspec_t * \fIqs\fR as third argument.
 
-\fBFLOWSFLAGS\fR    - set flow flags. Takes flow flags as third
-argument. Supported flags are:
+\fBFLOWSFLAGS\fR - set flow flags. Takes flow \fBuint32_t\fR
+\fIflags\fR as third argument. Supported flags are:
 
 .RS 8
 \fIFLOWFRDONLY\fR   - set flow to read-only.
@@ -67,25 +67,30 @@ no partial writes).
 
 .RE
 
-\fBFLOWGFLAGS\fR    - get the current flow flags. Takes an \fBuint32_t
+\fBFLOWGFLAGS\fR    - get the current flow flags. Takes an \fBuint32_t *
 \fIflags\fR as third argument.
 
 \fBFLOWGRXQLEN\fR   - get the current number of packets in the receive
-buffer. Takes a \fBsize_t \fIqlen\fR as third argument.
+buffer. Takes a \fBsize_t \fIqlen\fR * as third argument.
 
 \fBFLOWGTXQLEN\fR   - get the current number of packets in the transmit
-buffer. Takes a \fBsize_t \fIqlen\fR as third argument.
+buffer. Takes a \fBsize_t \fIqlen\fR * as third argument.
 
-\fBFRCTGFLAGS\fR    - get the current flow flags. Takes an \fBuint16_t
+\fBFRCTSFLAGS\fR    - set the current flow flags. Takes an \fBuint16_t
 \fIflags\fR as third argument. Supported flags are:
 
 .RS 8
 \fIFRCTFRESCNTRL\fR - resource control enabled.
 
-\fIFRCTFRTX\fR      - retransmission enabled.
+\fIFRCTFRTX\fR      - retransmission enabled. Cannot be modified and will
+be ignored on set.
+
+\fIFRCTFLINGER\fR   - finish connection on flow deallocation.
 
 .RE
 
+\fBFRCTGFLAGS\fR    - get the current flow flags. Takes an \fBuint16_t *
+\fIflags\fR as third argument.
 
 .SH RETURN VALUE
 
diff --git a/doc/man/flow_alloc.3 b/doc/man/flow_alloc.3
index a357ee19..f67bf97a 100644
--- a/doc/man/flow_alloc.3
+++ b/doc/man/flow_alloc.3
@@ -59,7 +59,8 @@ The \fBflow_join\fR() function allows applications to join a broadcast
 flow provided by a broadcast layer. The dst is the layer name.
 
 The \fBflow_dealloc\fR() function will release any resources
-associated with the flow.
+associated with the flow. This call may block and keep reliable flows
+active until all packets are acknowledged.
 
 A \fBqosspec_t\fR specifies the following QoS characteristics of a
 flow:
diff --git a/src/lib/dev.c b/src/lib/dev.c
index c8b7d93b..4416a03e 100644
--- a/src/lib/dev.c
+++ b/src/lib/dev.c
@@ -853,6 +853,7 @@ int fccntl(int fd,
 {
         uint32_t *        fflags;
         uint16_t *        cflags;
+        uint16_t          csflags;
         va_list           l;
         struct timespec * timeo;
         qosspec_t *       qs;
@@ -963,15 +964,13 @@ int fccntl(int fd,
                 *fflags = flow->oflags;
                 break;
         case FRCTSFLAGS:
-                cflags = va_arg(l, uint16_t *);
-                if (cflags == NULL)
-                        goto einval;
+                csflags = (uint16_t) va_arg(l, uint32_t);
                 if (flow->frcti == NULL)
                         goto eperm;
-                frcti_setflags(flow->frcti, *cflags);
+                frcti_setflags(flow->frcti, csflags);
                 break;
         case FRCTGFLAGS:
-                cflags = (uint16_t *) va_arg(l, int *);
+                cflags = (uint16_t *) va_arg(l, uint32_t *);
                 if (cflags == NULL)
                         goto einval;
                 if (flow->frcti == NULL)