I've had preliminary success with this patch. More testing needs
to be done, but in the meantime, I would appreciate reviews and
comments. The patched code is available from
http://beta.freebsddiary.org/tmp/uthread_write.c and the patch
appears below.
In short, the logic has been changed to ensure that if __sys_write
returns zero, this value is returned by _write.
The syslog calls are just for debugging and will be removed.
Thank you.
--- uthread_write.c.org Tue Sep 16 12:14:22 2003
+++ uthread_write.c Tue Sep 16 16:38:02 2003
@@ -39,6 +39,7 @@
#include <unistd.h>
#include <pthread.h>
#include "pthread_private.h"
+#include <syslog.h>
ssize_t
_write(int fd, const void *buf, size_t nbytes)
@@ -93,7 +94,7 @@
* write:
*/
if (blocking && ((n < 0 && (errno == EWOULDBLOCK ||
- errno == EAGAIN)) || (n >= 0 && num < nbytes))) {
+ errno == EAGAIN)) || (n > 0 && num < nbytes))) {
curthread->data.fd.fd = fd;
_thread_kern_set_timeout(NULL);
@@ -136,6 +137,15 @@
ret = num;
else
ret = n;
+
+ } else if (n == 0) {
+ ret = 0;
+ if (n == 0) {
+ setlogmask (LOG_UPTO (LOG_NOTICE));
+ openlog("uthread_write.c", LOG_CONS | LOG_PID
| LOG_NDELAY,
LOG_LOCAL1);
+ syslog (LOG_NOTICE, "zero has been returned in
uthread_write.c;
num = '%d'", num);
+ }
+ break;
/* Check if the write has completed: */
} else if (num >= nbytes)
--
Dan Langille : http://www.langille.org/
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