[PATCH] libibumad: document the setting of errno for umad_send and umad_recv

[Ira Weiny <ira.weiny-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>]

Signed-off-by: Ira Weiny <ira.weiny-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
---
 man/umad_recv.3 |    3 ++-
 man/umad_send.3 |    3 ++-
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/man/umad_recv.3 b/man/umad_recv.3
index e233411..56e4ca7 100644
--- a/man/umad_recv.3
+++ b/man/umad_recv.3
@@ -55,7 +55,8 @@ be returned.
 
 .SH "RETURN VALUE"
 .B umad_recv()
-returns non negative receiving agentid on success, and a negative value on error as follows:
+on success return the agentid; on error, errno is set and a negative value is
+returned as follows:
  -EINVAL      invalid port handle or agentid or *length is less than the minimum supported
  -EIO         receive operation failed
  -EWOULDBLOCK non blocking read can't be fulfilled
diff --git a/man/umad_send.3 b/man/umad_send.3
index feb33af..b85bc56 100644
--- a/man/umad_send.3
+++ b/man/umad_send.3
@@ -39,7 +39,8 @@ makes kernel wait forever for the reply.
 indicates the number of times the MAD will be retried before giving up.
 .SH "RETURN VALUE"
 .B umad_send()
-returns 0 on success, and a negative value on error as follows:
+returns 0 on success; on error, errno is set and a negative value is returned
+as follows:
  -EINVAL invalid port handle or agentid
  -EIO    send operation failed
 .SH "AUTHOR"
-- 
1.7.1

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