POSIX requires that a process calling tcsetpgrp(3) from the background

gets a SIGTTOU signal.  In that case, do not stop.
Portability issue found while testing on commercial Solaris 9/10/11.
Thanks to opencsw.org for providing me with a testing environment.

1 files changed, 18 insertions, 6 deletions

diff --git a/tag.c b/tag.c
index f7ffe2cb..f5051c0b 100644
--- a/tag.c
+++ b/tag.c
@@ -57,6 +57,24 @@ tag_init(void)
 	tag_files.tfd = -1;
 	tag_files.tcpgid = -1;
 
+	/* Clean up when dying from a signal. */
+
+	memset(&sa, 0, sizeof(sa));
+	sigfillset(&sa.sa_mask);
+	sa.sa_handler = tag_signal;
+	sigaction(SIGHUP, &sa, NULL);
+	sigaction(SIGINT, &sa, NULL);
+	sigaction(SIGTERM, &sa, NULL);
+
+	/*
+	 * POSIX requires that a process calling tcsetpgrp(3)
+	 * from the background gets a SIGTTOU signal.
+	 * In that case, do not stop.
+	 */
+
+	sa.sa_handler = SIG_IGN;
+	sigaction(SIGTTOU, &sa, NULL);
+
 	/* Save the original standard output for use by the pager. */
 
 	if ((tag_files.ofd = dup(STDOUT_FILENO)) == -1)
@@ -68,12 +86,6 @@ tag_init(void)
 	    sizeof(tag_files.ofn));
 	(void)strlcpy(tag_files.tfn, "/tmp/man.XXXXXXXXXX",
 	    sizeof(tag_files.tfn));
-	memset(&sa, 0, sizeof(sa));
-	sigfillset(&sa.sa_mask);
-	sa.sa_handler = tag_signal;
-	sigaction(SIGHUP, &sa, NULL);
-	sigaction(SIGINT, &sa, NULL);
-	sigaction(SIGTERM, &sa, NULL);
 	if ((ofd = mkstemp(tag_files.ofn)) == -1)
 		goto fail;
 	if ((tag_files.tfd = mkstemp(tag_files.tfn)) == -1)