From 6c8507724b4c7f3e4eb93cecc1ff816c2d3714f1 Mon Sep 17 00:00:00 2001
From: Wayne Davison <wayned@samba.org>
Date: Sat, 30 Sep 2006 22:11:20 +0000
Subject: [PATCH] Added exception-checking to a couple select() calls, as
 suggested by Hugh Daschbach.

---
 io.c | 29 +++++++++++++++++++++--------
 1 file changed, 21 insertions(+), 8 deletions(-)

diff --git a/io.c b/io.c
index 2f5ffb0b..55aac4a9 100644
--- a/io.c
+++ b/io.c
@@ -633,13 +633,19 @@ int read_filesfrom_line(int fd, char *fname)
 		if (cnt < 0 && (errno == EWOULDBLOCK
 		  || errno == EINTR || errno == EAGAIN)) {
 			struct timeval tv;
-			fd_set fds;
-			FD_ZERO(&fds);
-			FD_SET(fd, &fds);
+			fd_set r_fds, e_fds;
+			FD_ZERO(&r_fds);
+			FD_SET(fd, &r_fds);
+			FD_ZERO(&e_fds);
+			FD_SET(fd, &e_fds);
 			tv.tv_sec = select_timeout;
 			tv.tv_usec = 0;
-			if (!select(fd+1, &fds, NULL, NULL, &tv))
+			if (!select(fd+1, &r_fds, NULL, &e_fds, &tv))
 				check_timeout();
+			if (FD_ISSET(fd, &e_fds)) {
+				rsyserr(FINFO, errno,
+					"select exception on fd %d", fd);
+			}
 			continue;
 		}
 		if (cnt != 1)
@@ -1036,7 +1042,7 @@ static void sleep_for_bwlimit(int bytes_written)
 static void writefd_unbuffered(int fd,char *buf,size_t len)
 {
 	size_t n, total = 0;
-	fd_set w_fds, r_fds;
+	fd_set w_fds, r_fds, e_fds;
 	int maxfd, count, cnt, using_r_fds;
 	int defer_save = defer_forwarding_messages;
 	struct timeval tv;
@@ -1045,12 +1051,14 @@ static void writefd_unbuffered(int fd,char *buf,size_t len)
 
 	while (total < len) {
 		FD_ZERO(&w_fds);
-		FD_SET(fd,&w_fds);
+		FD_SET(fd, &w_fds);
+		FD_ZERO(&e_fds);
+		FD_SET(fd, &e_fds);
 		maxfd = fd;
 
 		if (msg_fd_in >= 0) {
 			FD_ZERO(&r_fds);
-			FD_SET(msg_fd_in,&r_fds);
+			FD_SET(msg_fd_in, &r_fds);
 			if (msg_fd_in > maxfd)
 				maxfd = msg_fd_in;
 			using_r_fds = 1;
@@ -1062,7 +1070,7 @@ static void writefd_unbuffered(int fd,char *buf,size_t len)
 
 		errno = 0;
 		count = select(maxfd + 1, using_r_fds ? &r_fds : NULL,
-			       &w_fds, NULL, &tv);
+			       &w_fds, &e_fds, &tv);
 
 		if (count <= 0) {
 			if (count < 0 && errno == EBADF)
@@ -1071,6 +1079,11 @@ static void writefd_unbuffered(int fd,char *buf,size_t len)
 			continue;
 		}
 
+		if (FD_ISSET(fd, &e_fds)) {
+			rsyserr(FINFO, errno,
+				"select exception on fd %d", fd);
+		}
+
 		if (using_r_fds && FD_ISSET(msg_fd_in, &r_fds))
 			read_msg_fd();
 
-- 
2.34.1