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Date: Wed, 15 Jul 1998 22:26:43 -0500 (CDT)
From: Jay Gramlich <jayg@fgi.net>
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To: FreeBSD-gnats-submit@FreeBSD.ORG
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Subject: ports/7295: Starting programs with bash port causes problems when openfiles is set high
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>Number:         7295
>Category:       ports
>Synopsis:       Starting programs with bash port causes problems when openfiles is set high
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-ports
>State:          open
>Quarter:
>Keywords:
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Wed Jul 15 20:50:01 PDT 1998
>Last-Modified:
>Originator:     Jay Gramlich
>Organization:
>Release:        FreeBSD 2.2.6-RELEASE i386
>Environment:

FreeBSD londo.gramlich.lan 2.2.6-RELEASE FreeBSD 2.2.6-RELEASE #0: Sat Jul 11 15:54:11 CDT 1998     root@londo.gramlich.lan:/usr/src/sys/compile/LONDO  i386


>Description:

When using bash as the running shell and openfiles is set to a large value
(>258?) some programs (rxvt, eterm)  fail on a select call and chew up cpu
time and which makes them appear to not work.  This only happens when
starting the program using bash (not sh or csh) and happens with both
bash 1.x and 2.x.  The effect is listed in another pr concerning rxvt.
I'm not sure if this is a bug in bash or if bash is tickling something else.



>How-To-Repeat:

login as a user with high openfile limits.
Compile and run this program.

---cut---

#include <sys/types.h>
#include <sys/time.h>
#include <fcntl.h>
#include <unistd.h>

int main() {
  fd_set readfds;
  int retval;
  int fd;
  struct itimerval value;
  fd=open("/tmp/testselect",O_CREAT|O_RDWR, 0600);
  if (fd<0) exit(1);
  FD_ZERO(&readfds);
  FD_SET(fd,&readfds);
  value.it_value.tv_usec=0;
  value.it_value.tv_sec=1;
  retval=select(getdtablesize(), &readfds, NULL, NULL, &value.it_value);
  if (retval<0) perror("select");
  printf("select returned: %i\n",retval);
  close(fd);
  unlink("/tmp/testselect");
  exit(0);
}

---cut---

When run under sh or csh the select call succeeds.
Under bash it will fail with 
select:: Bad file descriptor
select returned: -1
If you do a ulimit -n 258 - It works but with ulimit 259 it fail.

>Fix:

Don't use bash to start programs :-)	

>Audit-Trail:
>Unformatted:

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