From owner-freebsd-current  Tue Jan 30 12:52:21 1996
Return-Path: owner-current
Received: (from root@localhost)
          by freefall.freebsd.org (8.7.3/8.7.3) id MAA28408
          for current-outgoing; Tue, 30 Jan 1996 12:52:21 -0800 (PST)
Received: from godzilla.zeta.org.au (godzilla.zeta.org.au [203.2.228.19])
          by freefall.freebsd.org (8.7.3/8.7.3) with SMTP id MAA28317
          Tue, 30 Jan 1996 12:52:11 -0800 (PST)
Received: (from bde@localhost) by godzilla.zeta.org.au (8.6.9/8.6.9) id HAA25491; Wed, 31 Jan 1996 07:51:31 +1100
Date: Wed, 31 Jan 1996 07:51:31 +1100
From: Bruce Evans <bde@zeta.org.au>
Message-Id: <199601302051.HAA25491@godzilla.zeta.org.au>
To: current@freebsd.org, dyson@freebsd.org
Subject: new pipes fail several tests #1
Sender: owner-current@freebsd.org
Precedence: bulk

The Minix test programs found several bugs in the new pipe code.

#1: read() doesn't return -1/EAGAIN for EOF in non-blocking mode.  See
POSIX.1-1990 6.4.1.2(2).

Bruce

#include <sys/types.h>
#include <assert.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <unistd.h>

#define check(what, expected)	assert((what, expected))

int main(void)
{
  char buf[1];
  int fd[2];
  int r;

  r = pipe(fd);
  check("pipe", r == 0);
  r = fcntl(fd[0], F_SETFL, O_NONBLOCK);
  check("fcntl", r == 0);
  r = read(fd[0], buf, 1);
  printf("read %d bytes, errno = %d\n", r, errno);
  check("read", r == -1);
  check("read", errno == EAGAIN);
  return 0;
}