From 66b48eea3326f9c652c394128993a275c064932d Mon Sep 17 00:00:00 2001
From: Ben Gras <ben@minix3.org>
Date: Mon, 5 Sep 2005 17:17:58 +0000
Subject: [PATCH] Joren l'Ami 's updates to stdio, minor modification by me too
 (skip doing anything in fflush() if stream is a pipe).

---
 lib/stdio/fflush.c  |  4 ++++
 lib/stdio/fopen.c   |  9 +++++++++
 lib/stdio/freopen.c | 31 +++++++++++++++++++++----------
 3 files changed, 34 insertions(+), 10 deletions(-)

diff --git a/lib/stdio/fflush.c b/lib/stdio/fflush.c
index e99b18416..ce058570d 100755
--- a/lib/stdio/fflush.c
+++ b/lib/stdio/fflush.c
@@ -29,6 +29,10 @@ fflush(FILE *stream)
 	if (io_testflag(stream, _IOREADING)) {
 		/* (void) fseek(stream, 0L, SEEK_CUR); */
 		int adjust = 0;
+		if (io_testflag(stream, _IOFIFO)) {
+			/* Can't seek in a pipe. */
+			return 0;
+		}
 		if (stream->_buf && !io_testflag(stream,_IONBF))
 			adjust = -stream->_count;
 		stream->_count = 0;
diff --git a/lib/stdio/fopen.c b/lib/stdio/fopen.c
index 915dcb2c6..82663f599 100755
--- a/lib/stdio/fopen.c
+++ b/lib/stdio/fopen.c
@@ -9,6 +9,7 @@
 #include	<stdio.h>
 #include	<stdlib.h>
 #include	"loc_incl.h"
+#include	<sys/stat.h>
 
 #define	PMODE		0666
 
@@ -48,6 +49,7 @@ fopen(const char *name, const char *mode)
 	register int i;
 	int rwmode = 0, rwflags = 0;
 	FILE *stream;
+	struct stat st;
 	int fd, flags = 0;
 
 	for (i = 0; __iotab[i] != 0 ; i++) 
@@ -103,6 +105,13 @@ fopen(const char *name, const char *mode)
 
 	if (fd < 0) return (FILE *)NULL;
 
+	if ( fstat( fd, &st ) < 0 ) {
+		_close(fd);
+		return (FILE *)NULL;
+	}
+	
+	if ( st.st_mode & S_IFIFO ) flags |= _IOFIFO;
+	
 	if (( stream = (FILE *) malloc(sizeof(FILE))) == NULL ) {
 		_close(fd);
 		return (FILE *)NULL;
diff --git a/lib/stdio/freopen.c b/lib/stdio/freopen.c
index c237bfaf6..a81137794 100755
--- a/lib/stdio/freopen.c
+++ b/lib/stdio/freopen.c
@@ -9,6 +9,7 @@
 #include	<stdio.h>
 #include	<stdlib.h>
 #include	"loc_incl.h"
+#include	<sys/stat.h>
 
 #define	PMODE		0666
 
@@ -31,6 +32,7 @@ FILE *
 freopen(const char *name, const char *mode, FILE *stream)
 {
 	register int i;
+	struct stat st;
 	int rwmode = 0, rwflags = 0;
 	int fd, flags = stream->_flags & (_IONBF | _IOFBF | _IOLBF | _IOMYBUF);
 
@@ -53,7 +55,7 @@ freopen(const char *name, const char *mode, FILE *stream)
 		rwflags |= O_APPEND | O_CREAT;
 		break;         
 	default:
-		return (FILE *)NULL;
+		goto loser;
 	}
 
 	while (*mode) {
@@ -81,19 +83,28 @@ freopen(const char *name, const char *mode, FILE *stream)
 	}
 
 	if (fd < 0) {
-		for( i = 0; i < FOPEN_MAX; i++) {
-			if (stream == __iotab[i]) {
-				__iotab[i] = 0;
-				break;
-			}
-		}
-		if (stream != stdin && stream != stdout && stream != stderr)
-			free((void *)stream);
-		return (FILE *)NULL;
+		goto loser;
 	}
 
+	if ( fstat( fd, &st ) == 0 ) {
+		if ( st.st_mode & S_IFIFO ) flags |= _IOFIFO;
+	} else {
+		goto loser;
+	}
+	
 	stream->_count = 0;
 	stream->_fd = fd;
 	stream->_flags = flags;
 	return stream;
+
+loser:
+	for( i = 0; i < FOPEN_MAX; i++) {
+		if (stream == __iotab[i]) {
+			__iotab[i] = 0;
+			break;
+		}
+	}
+	if (stream != stdin && stream != stdout && stream != stderr)
+		free((void *)stream);
+	return (FILE *)NULL;	
 }