From c2f7c3e4893b6b5c4494d549b3645e06664bc1b1 Mon Sep 17 00:00:00 2001
From: julian <julian@FreeBSD.org>
Date: Wed, 5 Feb 1997 23:26:09 +0000
Subject: Submitted by:	 John Birrell uthreads update from the author.

---
 lib/libc_r/uthread/uthread_read.c | 37 ++++++++++++++++++++++---------------
 1 file changed, 22 insertions(+), 15 deletions(-)

(limited to 'lib/libc_r/uthread/uthread_read.c')

diff --git a/lib/libc_r/uthread/uthread_read.c b/lib/libc_r/uthread/uthread_read.c
index 9158844..504143d 100644
--- a/lib/libc_r/uthread/uthread_read.c
+++ b/lib/libc_r/uthread/uthread_read.c
@@ -42,22 +42,31 @@
 ssize_t
 read(int fd, void *buf, size_t nbytes)
 {
-	int             nonblock;
-	int             ret;
-	int             status;
-	if (fd < 0 || fd > _thread_dtablesize || _thread_fd_table[fd] == NULL) {
-		_thread_seterrno(_thread_run, EBADF);
-		ret = -1;
-	} else if ((nonblock = _thread_fd_table[fd]->flags & O_NONBLOCK) == 0 && (ret = _thread_fd_lock(fd, FD_READ, NULL, __FILE__, __LINE__)) != 0) {
-		/* Cannot lock file descriptor. */
-	} else {
+	int	ret;
+	int	status;
+
+	/* Lock the file descriptor for read: */
+	if ((ret = _thread_fd_lock(fd, FD_READ, NULL,
+	    __FILE__, __LINE__)) == 0) {
+		/* Perform a non-blocking read syscall: */
 		while ((ret = _thread_sys_read(fd, buf, nbytes)) < 0) {
-			if (nonblock == 0 && (errno == EWOULDBLOCK || errno == EAGAIN)) {
+			if (_thread_fd_table[fd]->flags & O_NONBLOCK == 0 &&
+			    (errno == EWOULDBLOCK || errno == EAGAIN)) {
 				_thread_kern_sig_block(&status);
 				_thread_run->data.fd.fd = fd;
 				_thread_kern_set_timeout(NULL);
-				_thread_kern_sched_state(PS_FDR_WAIT, __FILE__, __LINE__);
-				if (errno == EINTR) {
+
+				/* Reset the interrupted operation flag: */
+				_thread_run->interrupted = 0;
+
+				_thread_kern_sched_state(PS_FDR_WAIT,
+				    __FILE__, __LINE__);
+
+				/*
+				 * Check if the operation was
+				 * interrupted by a signal
+				 */
+				if (_thread_run->interrupted) {
 					ret = -1;
 					break;
 				}
@@ -65,9 +74,7 @@ read(int fd, void *buf, size_t nbytes)
 				break;
 			}
 		}
-		if (nonblock == 0) {
-			_thread_fd_unlock(fd, FD_READ);
-		}
+		_thread_fd_unlock(fd, FD_READ);
 	}
 	return (ret);
 }
-- 
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