From 9f884254c7708e5c45656623b738c91b71cc946a Mon Sep 17 00:00:00 2001 From: peter Date: Tue, 6 Apr 1999 04:31:23 +0000 Subject: This is a hack. Cron runs with stdin/out/err pointing to /dev/console, which init thoughtfully revoke()'s when starting a getty on ttyv0. This Cron's popen() was passing these fd's through to cron children (ie: sendmail, *not* normal cron jobs). The side effects were usually not noticed, but it tripped up postfix which did a sanity check to see that stdin/out/err were open, and got EBADF even thought the fd's were in use. I seem to recall sendmail itself has hacks to work around this problem, it had a checkfd012() function, possibly for this same problem. (Postfix has a workaround too now though..) This is a hack, not a fix. It's probably best to check and perhaps close/reopen() /dev/console if needed each time around the event loop. It would probably be useful to actually see any error messages from cron. --- usr.sbin/cron/cron/popen.c | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-) (limited to 'usr.sbin') diff --git a/usr.sbin/cron/cron/popen.c b/usr.sbin/cron/cron/popen.c index 34b2f02..7613f54 100644 --- a/usr.sbin/cron/cron/popen.c +++ b/usr.sbin/cron/cron/popen.c @@ -28,11 +28,12 @@ static char sccsid[] = "@(#)popen.c 5.7 (Berkeley) 2/14/89"; #endif static const char rcsid[] = - "$Id$"; + "$Id: popen.c,v 1.5 1997/09/15 06:39:07 charnier Exp $"; #endif /* not lint */ #include "cron.h" #include +#include #define MAX_ARGS 100 @@ -105,6 +106,9 @@ cron_popen(program, type) /* NOTREACHED */ case 0: /* child */ if (*type == 'r') { + /* Do not share our parent's stdin */ + (void)close(0); + (void)open("/dev/null", O_RDWR); if (pdes[1] != 1) { dup2(pdes[1], 1); dup2(pdes[1], 2); /* stderr, too! */ @@ -116,6 +120,11 @@ cron_popen(program, type) dup2(pdes[0], 0); (void)close(pdes[0]); } + /* Hack: stdout gets revoked */ + (void)close(1); + (void)open("/dev/null", O_RDWR); + (void)close(2); + (void)open("/dev/null", O_RDWR); (void)close(pdes[1]); } #if WANT_GLOBBING -- cgit v1.1