From owner-freebsd-questions  Sat Feb 15 09:34:09 1997
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Date: Sat, 15 Feb 1997 09:34:44 -0800 (PST)
Message-Id: <199702151734.JAA13816@squirrel.tgsoft.com>
From: mark thompson <thompson@tgsoft.com>
To: freebsd-questions@freebsd.com
Subject: at
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I sometimes like to write at scripts that resubmit themselves, perhaps
one day later (sometimes this is cooler than using cron).

This doesn't work on FreeBSD 2.1.6 (at least on my system) because the
resubmitted script starts out with:

#! /bin/sh
# mail     root 0

and the code in atrun.c does this:

    if (fscanf(stream, "#! /bin/sh\n# mail %8s %d", mailbuf, &send_mail) == 2)
    {
	mailname = mailbuf;
	pentry = getpwnam(mailname);
	if (pentry == NULL || pentry->pw_uid != uid) {
		syslog(LOG_ERR,"Userid %lu mismatch name %s - aborting job %s",
		       (unsigned long) uid, mailname, filename);
		exit(EXIT_FAILURE);
	}
    }

and pukes because 'root' is not my name.

I looked at at.c:

    /* Get the userid to mail to, first by trying getlogin(), which reads
     * /etc/utmp, then from LOGNAME, finally from getpwuid().
     */
    mailname = getlogin();
    if (mailname == NULL)
	mailname = getenv("LOGNAME");

    if ((mailname == NULL) || (mailname[0] == '\0')
	|| (strlen(mailname) > 8) || (getpwnam(mailname)==NULL))
    {
	pass_entry = getpwuid(getuid());
	if (pass_entry != NULL)
	    mailname = pass_entry->pw_name;
    }

obviously, getlogin is succeeding, because LOGNAME is set correctly in
the at job. atrun.c does not do a setlogin. Should it?

-mark

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