When the user exits the pager before the pager has drained all input

from man(1), man(1) dies from SIGPIPE.  Exiting man(1) is fine in this
case, generating more output would be pointless, but without handling
SIGPIPE, the exit code from man(1) was wrong and csh(1) printed an
ugly message "Broken pipe".  Fix this by handling SIGPIPE explicitly.
Issue noticed by deraadt@.

1 files changed, 2 insertions, 0 deletions

diff --git a/read.c b/read.c
index abad8e0c..511ce45e 100644
--- a/read.c
+++ b/read.c
@@ -29,6 +29,7 @@
 #include <ctype.h>
 #include <errno.h>
 #include <fcntl.h>
+#include <signal.h>
 #include <stdarg.h>
 #include <stdint.h>
 #include <stdio.h>
@@ -846,6 +847,7 @@ mparse_open(struct mparse *curp, int *fd, const char *file)
 			perror("dup");
 			exit((int)MANDOCLEVEL_SYSERR);
 		}
+		signal(SIGPIPE, SIG_DFL);
 		execlp("gunzip", "gunzip", "-c", file, NULL);
 		perror("exec");
 		exit((int)MANDOCLEVEL_SYSERR);