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Date: Fri, 20 Sep 1996 14:33:28 -0700 (PDT)
From: Jeffrey Hsu <hsu>
Message-Id: <199609202133.OAA05442@freefall.freebsd.org>
To: dubois@primate.wisc.edu
Subject: Re: libc_r bug
Cc: hackers
Sender: owner-hackers@FreeBSD.ORG
X-Loop: FreeBSD.org
Precedence: bulk

  > What happens, and what do you expect to happen?

The first write gets lost.  This is because the uthreads internal
fd table is not set up for fds which are inherited from the parent
process.  I got around it with the following hack.  This workaround
is bad because it assumes that fd 0, 1, and 2 are valid upon
start-up, which is generally but universally true.  Alternatively,
one could place a call to _thread_fd_table_init() in uthreads_write.c.
Neither solution is very stisfactory.

*** uthread_init.c      1996/08/20 08:21:23     1.3
--- uthread_init.c      1996/09/20 18:18:53
***************
*** 176,186 ****
                         */
                        PANIC("Cannot allocate memory for file descriptor table");
                } else {
                        /*
                         * Enter a loop to initialise the file descriptor
                         * table: 
                         */
!                       for (i = 0; i < _thread_dtablesize; i++) {
                                /* Initialise the file descriptor table: */
                                _thread_fd_table[i] = NULL;
                        }
--- 176,189 ----
                         */
                        PANIC("Cannot allocate memory for file descriptor table");
                } else {
+                       _thread_fd_table_init(0);
+                       _thread_fd_table_init(1);
+                       _thread_fd_table_init(2);
                        /*
                         * Enter a loop to initialise the file descriptor
                         * table: 
                         */
!                       for (i = 2; i < _thread_dtablesize; i++) {
                                /* Initialise the file descriptor table: */
                                _thread_fd_table[i] = NULL;