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| -rw-r--r-- | man3/cmsg.3 | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/man3/cmsg.3 b/man3/cmsg.3 index 83bb633ccd..8b2c68fe0e 100644 --- a/man3/cmsg.3 +++ b/man3/cmsg.3 @@ -106,6 +106,12 @@ This is a constant expression. .BR CMSG_DATA () returns a pointer to the data portion of a .IR cmsghdr . +The pointer returned cannot be assumed to be suitably aligned for +accessing arbitrary payload data types. +Applications should not cast it to a pointer type matching the payload, +but should instead use +.BR memcpy (3) +to copy data to or from a suitably declared object. .IP * .BR CMSG_LEN () returns the value to store in the |