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Oops! Bad Idea! (TM)

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Restore the clamp on the return value from rpc_dtablesize()..  Some programs
(eg: ypserv) use this as an indication of how large svc_fdset is in their
hand-rolled svc_run() loops.  The svc_fdset table is maintained by the
rpc library explicitly for compatability with such programs.  (It uses
a different variable-sized bitmap itself internally)
This commit is contained in:
Peter Wemm 1996-12-30 18:41:20 +00:00
parent a7ccaef83f
commit c5bb6008ce
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=21103
1 changed files with 13 additions and 3 deletions
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16
lib/libc/rpc/rpc_dtablesize.c
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@ -30,7 +30,7 @@
#if defined(LIBC_SCCS) && !defined(lint)
/*static char *sccsid = "from: @(#)rpc_dtablesize.c 1.2 87/08/11 Copyr 1987 Sun Micro";*/
/*static char *sccsid = "from: @(#)rpc_dtablesize.c 2.1 88/07/29 4.0 RPCSRC";*/
static char *rcsid = "rpc_dtablesize.c,v 1.1 1994/08/07 18:36:02 wollman Exp";
static char *rcsid = "$Id$";
#endif
#include <sys/types.h>
@ -40,12 +40,22 @@ static char *rcsid = "rpc_dtablesize.c,v 1.1 1994/08/07 18:36:02 wollman Exp";
* Cache the result of getdtablesize(), so we don't have to do an
* expensive system call every time.
*/
/*
* XXX In FreeBSD 2.x, you can have the maximum number of open file
* descriptors be greater than FD_SETSIZE (which us 256 by default).
*
* Since old programs tend to use this call to determine the first arg
* for select(), having this return > FD_SETSIZE is a Bad Idea(TM)!
*/
int
_rpc_dtablesize()
_rpc_dtablesize(void)
{
static int size;
if (size == 0)
if (size == 0) {
size = getdtablesize();
if (size > FD_SETSIZE)
size = FD_SETSIZE;
}
return (size);
}