ubase

commit f308a587400f29391626fe7243256c918cfd120a
parent dfc2f7edac556f9b4e95ba016a6011fff33b2d30
Author: sin <sin@2f30.org>
Date:   Thu, 10 Apr 2014 11:21:12 +0100

Error out if dup2 doesn't return the fd we want

Diffstat:
M
getty.c
 | 
9
++++++---

1 file changed, 6 insertions(+), 3 deletions(-)
diff --git a/getty.c b/getty.c
@@ -65,9 +65,12 @@ main(int argc, char *argv[])
 	fd = open(tty, O_RDWR);
 	if (fd < 0)
 		eprintf("open %s:", tty);
-	dup2(fd, STDIN_FILENO);
-	dup2(fd, STDOUT_FILENO);
-	dup2(fd, STDERR_FILENO);
+	if (dup2(fd, STDIN_FILENO) != STDIN_FILENO)
+		eprintf("dup2:");
+	if (dup2(fd, STDOUT_FILENO) != STDOUT_FILENO)
+		eprintf("dup2:");
+	if (dup2(fd, STDERR_FILENO) != STDERR_FILENO)
+		eprintf("dup2:");
 
 	sa.sa_handler = SIG_DFL;
 	sa.sa_flags = 0;