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Bow to tradition and correctly implement the bogus-but-hallowed semantics

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of getsockopt never telling how much it might have copied if only the
buffer were big enough.
This commit is contained in:
Garrett Wollman 1998-08-31 18:07:23 +00:00
parent 119cff04ef
commit 9898afa1f1
1 changed files with 6 additions and 5 deletions
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11
sys/kern/uipc_socket.c
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@ -31,7 +31,7 @@
* SUCH DAMAGE.
*
* @(#)uipc_socket.c 8.3 (Berkeley) 4/15/94
* $Id: uipc_socket.c,v 1.43 1998/08/23 03:06:59 wollman Exp $
* $Id: uipc_socket.c,v 1.44 1998/08/31 15:34:55 wollman Exp $
*/
#include <sys/param.h>
@ -1078,13 +1078,14 @@ sooptcopyout(sopt, buf, len)
/*
* Documented get behavior is that we always return a value,
* possibly truncated to fit in the user's buffer.
* We leave the correct length in sopt->sopt_valsize,
* to be copied out in getsockopt(). Note that this
* interface is not idempotent; the entire answer must
* Traditional behavior is that we always tell the user
* precisely how much we copied, rather than something useful
* like the total amount we had available for her.
* Note that this interface is not idempotent; the entire answer must
* generated ahead of time.
*/
valsize = min(len, sopt->sopt_valsize);
sopt->sopt_valsize = len;
sopt->sopt_valsize = valsize;
if (sopt->sopt_val != 0) {
if (sopt->sopt_p != 0)
error = copyout(buf, sopt->sopt_val, valsize);