From: David van Moolenbroek <david@minix3.org>
Date: Mon, 9 May 2016 09:55:07 +0000 (+0000)
Subject: Do not hide the MSG_NOSIGNAL flag
X-Git-Url: http://zhaoyanbai.com/repos/nsupdate.html?a=commitdiff_plain;h=53d2fa057ee88a709bcc793d3c777acad2c2a2ee;p=minix.git

Do not hide the MSG_NOSIGNAL flag

Instead, filter it in libc for old networking implementations, as
those do not support sending SIGPIPE to user processes anyway.  This
change allows newer socket drivers to implement the flag as per the
specification.

Change-Id: I423bdf28ca60f024a344d0a73e2eab38f1b269da
---

diff --git a/minix/lib/libc/sys/sendmsg.c b/minix/lib/libc/sys/sendmsg.c
index 4d4452cff..846d67dc6 100644
--- a/minix/lib/libc/sys/sendmsg.c
+++ b/minix/lib/libc/sys/sendmsg.c
@@ -96,6 +96,9 @@ ssize_t sendmsg(int sock, const struct msghdr *msg, int flags)
 		return -1;
 	}
 
+	/* For old socket driver implementations, this flag is the default. */
+	flags &= ~MSG_NOSIGNAL;
+
 	r= ioctl(sock, NWIOGUDSSOTYPE, &uds_sotype);
 	if (r != -1 || errno != ENOTTY) {
 		if (r == -1) {
diff --git a/minix/lib/libc/sys/sendto.c b/minix/lib/libc/sys/sendto.c
index 77304f301..c194c8182 100644
--- a/minix/lib/libc/sys/sendto.c
+++ b/minix/lib/libc/sys/sendto.c
@@ -66,6 +66,9 @@ ssize_t sendto(int sock, const void *message, size_t length, int flags,
 	if (r != -1 || (errno != ENOTSOCK && errno != ENOSYS))
 		return r;
 
+	/* For old socket driver implementations, this flag is the default. */
+	flags &= ~MSG_NOSIGNAL;
+
 	r= ioctl(sock, NWIOGTCPOPT, &tcpopt);
 	if (r != -1 || errno != ENOTTY)
 	{
diff --git a/sys/sys/socket.h b/sys/sys/socket.h
index 6b3a1190c..219b90baf 100644
--- a/sys/sys/socket.h
+++ b/sys/sys/socket.h
@@ -521,9 +521,7 @@ struct msghdr {
 #define	MSG_DONTWAIT	0x0080		/* this message should be nonblocking */
 #define	MSG_BCAST	0x0100		/* this message was rcvd using link-level brdcst */
 #define	MSG_MCAST	0x0200		/* this message was rcvd using link-level mcast */
-#if !defined(__minix)
 #define	MSG_NOSIGNAL	0x0400		/* do not generate SIGPIPE on EOF */
-#endif /* !defined(__minix) */
 #if defined(_NETBSD_SOURCE)
 #define	MSG_CMSG_CLOEXEC 0x0800		/* close on exec receiving fd */
 #define	MSG_NBIO	0x1000		/* use non-blocking I/O */