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Date: Tue, 30 May 2000 13:41:53 -0700 (PDT)
From: Archie Cobbs <archie@whistle.com>
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To: FreeBSD-gnats-submit@freebsd.org
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Subject: kern/18909: select(2) timeout limited to 100000000 seconds
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>Number:         18909
>Category:       kern
>Synopsis:       select(2) timeout limited to 100000000 seconds
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Tue May 30 13:50:00 PDT 2000
>Closed-Date:
>Last-Modified:
>Originator:     Archie Cobbs
>Release:        FreeBSD 3.4-RELEASE i386
>Organization:
Whistle Communications, Inc.
>Environment:

	3.4-REL, 4.0-stable, 5.0-current

>Description:

	select(2) returns EINVAL if the timeout is specified for
	longer than 100000000 seconds.

	Is this according to some specification? If so, nevermind,
	but please document this limitation in the man page. As it
	stands, there's nothing in the man page that indicates there
	is such an arbitrary limitation.

	Otherwise, it should support up to the maximum possible value
	that can be specified in a struct timeval.

>How-To-Repeat:

#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/time.h>
#include <unistd.h>
#include <string.h>
#include <err.h>

void
main(int ac, char *av[]) {
	struct timeval tv;
	fd_set fds;
	int r;

	switch (ac) {
	default:
		errx(1, "usage: xx [secs]");
	case 2:
		tv.tv_sec = strtol(av[1], 0, NULL);
		break;
	case 1:
		tv.tv_sec = 100000001;
		break;
	}
	tv.tv_usec = 0;

	FD_ZERO(&fds);
	FD_SET(0, &fds);

	r = select(1, &fds, NULL, NULL, &tv);
	if (r < 0)
		err(1, "select");
}


>Fix:

	Either allow all valid struct timeval's, or else please
	document this shortcoming in the man page.


>Release-Note:
>Audit-Trail:
>Unformatted:


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