From b38100974030617ec4fe5b20b38a045df6e92d2d Mon Sep 17 00:00:00 2001
From: Mike Frysinger
Date: Fri, 1 Jul 2005 01:29:44 +0000
Subject: 2005-06-30 Shaun Jackman <sjackman@gmail.com>
* loginutils/getty.c: (open_tty): Use dup2 instead of close/dup.
---
loginutils/getty.c | 30 ++++++++++++++----------------
1 file changed, 14 insertions(+), 16 deletions(-)
(limited to 'loginutils')
diff --git a/loginutils/getty.c b/loginutils/getty.c
index d123d49..9648a17 100644
--- a/loginutils/getty.c
+++ b/loginutils/getty.c
@@ -25,13 +25,14 @@
#include <fcntl.h>
#include <stdarg.h>
#include <ctype.h>
-#ifdef CONFIG_FEATURE_UTMP
-#include <utmp.h>
-#endif
#include <getopt.h>
#include <termios.h>
#include "busybox.h"
+#ifdef CONFIG_FEATURE_UTMP
+#include <utmp.h>
+#endif
+
#define _PATH_LOGIN "/bin/login"
/* If USE_SYSLOG is undefined all diagnostics go directly to /dev/console. */
@@ -153,7 +154,7 @@ struct options {
/* Storage for things detected while the login name was read. */
-static struct chardata {
+struct chardata {
int erase; /* erase character */
int kill; /* kill character */
int eol; /* end-of-line character */
@@ -233,9 +234,11 @@ static int caps_lock(const char *s);
static int bcode(char *s);
static void error(const char *fmt, ...) __attribute__ ((noreturn));
+#ifdef SYSV_STYLE
#ifdef CONFIG_FEATURE_UTMP
static void update_utmp(char *line);
#endif
+#endif
/* The following is used for understandable diagnostics. */
@@ -552,16 +555,11 @@ static void update_utmp(char *line)
/* open_tty - set up tty as standard { input, output, error } */
static void open_tty(char *tty, struct termio *tp, int local)
{
- /* Get rid of the present standard { output, error} if any. */
-
- (void) close(1);
- (void) close(2);
- errno = 0; /* ignore above errors */
-
/* Set up new standard input, unless we are given an already opened port. */
if (strcmp(tty, "-")) {
struct stat st;
+ int fd;
/* Sanity checks... */
@@ -574,12 +572,11 @@ static void open_tty(char *tty, struct termio *tp, int local)
/* Open the tty as standard input. */
- (void) close(0);
- errno = 0; /* ignore close(2) errors */
-
debug("open(2)\n");
- if (open(tty, O_RDWR | O_NONBLOCK, 0) != 0)
+ fd = open(tty, O_RDWR | O_NONBLOCK, 0);
+ if (dup2(fd, STDIN_FILENO) == -1)
error("/dev/%s: cannot open as standard input: %m", tty);
+ close(fd);
} else {
@@ -592,9 +589,10 @@ static void open_tty(char *tty, struct termio *tp, int local)
error("%s: not open for read/write", tty);
}
- /* Set up standard output and standard error file descriptors. */
+ /* Replace current standard output/error fd's with new ones */
debug("duping\n");
- if (dup(0) != 1 || dup(0) != 2) /* set up stdout and stderr */
+ if (dup2(STDIN_FILENO, STDOUT_FILENO) == -1 ||
+ dup2(STDIN_FILENO, STDERR_FILENO) == -1)
error("%s: dup problem: %m", tty); /* we have a problem */
/*
--
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