Always define LD_32_PRELOAD so it works for 32 bits binaries on

64 bits platforms.  Let rtld(1) decide if it needs to honor it
or not.

While here, fix a small bug in error reporting when asprintf(3)
returns an error.

Submitted by:	kib
Reviewed by:	kib (mentor)
MFC after:	1 week

1 files changed, 12 insertions, 1 deletions

diff --git a/usr.bin/stdbuf/stdbuf.c b/usr.bin/stdbuf/stdbuf.c
index b2ade7e..3831b5e 100644
--- a/usr.bin/stdbuf/stdbuf.c
+++ b/usr.bin/stdbuf/stdbuf.c
@@ -32,6 +32,7 @@
 #include <unistd.h>
 
 #define	LIBSTDBUF	"/usr/lib/libstdbuf.so"
+#define	LIBSTDBUF32	"/usr/lib32/libstdbuf.so"
 
 extern char *__progname;
 
@@ -92,7 +93,17 @@ main(int argc, char *argv[])
 		    LIBSTDBUF);
 
 	if (i < 0 || putenv(preload1) == -1)
-		warn("Failed to set environment variable: %s", preload1);
+		warn("Failed to set environment variable: LD_PRELOAD");
+	
+	preload0 = getenv("LD_32_PRELOAD");
+	if (preload0 == NULL)
+		i = asprintf(&preload1, "LD_32_PRELOAD=" LIBSTDBUF32);
+	else
+		i = asprintf(&preload1, "LD_32_PRELOAD=%s:%s", preload0,
+		    LIBSTDBUF32);
+
+	if (i < 0 || putenv(preload1) == -1)
+		warn("Failed to set environment variable: LD_32_PRELOAD");
 
 	execvp(argv[0], argv);
 	err(2, "%s", argv[0]);