- Rename getpty() to xgetpty() and adjust callers.

- Rewrite kbd_mode and setconsole - Introduce and use console_make_active() and xopen_xwrite_close() - honour buffer-reservation method as set by the user (dumpkmap, loadkmap) - shrink rtcwake and some console-tools Saves about 270 Bytes
2024-06-25 11:29:31 +00:00 · 2008-05-19 08:18:50 +00:00 · 2008-05-19 08:18:50 +00:00 · ae4342ca3e
commit ae4342ca3e
parent ee56e013cf
18 changed files with 136 additions and 142 deletions
--- a/console-tools/chvt.c
+++ b/console-tools/chvt.c
@ -9,25 +9,17 @@

 #include "libbb.h"

-/* From <linux/vt.h> */
-enum {
-	VT_ACTIVATE = 0x5606,   /* make vt active */
-	VT_WAITACTIVE = 0x5607  /* wait for vt active */
-};
-
 int chvt_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int chvt_main(int argc, char **argv)
 {
-	int fd, num;
+	int num;

 	if (argc != 2) {
 		bb_show_usage();
 	}

-	fd = get_console_fd();
 	num = xatou_range(argv[1], 1, 63);
 	/* double cast suppresses "cast to ptr from int of different size" */
-	xioctl(fd, VT_ACTIVATE, (void *)(ptrdiff_t)num);
-	xioctl(fd, VT_WAITACTIVE, (void *)(ptrdiff_t)num);
+	console_make_active(get_console_fd(), num);
 	return EXIT_SUCCESS;
 }
--- a/console-tools/dumpkmap.c
+++ b/console-tools/dumpkmap.c
@ -7,6 +7,7 @@
 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
 *
 */
+/* no options, no getopt */

 #include "libbb.h"

@ -23,18 +24,17 @@ struct kbentry {
 #define MAX_NR_KEYMAPS 256

 int dumpkmap_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
-int dumpkmap_main(int argc, char **argv)
+int dumpkmap_main(int ATTRIBUTE_UNUSED argc, char ATTRIBUTE_UNUSED **argv)
 {
 	struct kbentry ke;
 	int i, j, fd;
-	char flags[MAX_NR_KEYMAPS];
+	RESERVE_CONFIG_BUFFER(flags,MAX_NR_KEYMAPS);

-	if (argc >= 2 && argv[1][0] == '-')
-		bb_show_usage();
+/*	bb_warn_ignoring_args(argc>=2);*/

 	fd = xopen(CURRENT_VC, O_RDWR);

-	write(1, "bkeymap", 7);
+	write(STDOUT_FILENO, "bkeymap", 7);

 	/* Here we want to set everything to 0 except for indexes:
 	 * [0-2] [4-6] [8-10] [12] */
@ -43,7 +43,7 @@ int dumpkmap_main(int argc, char **argv)
 	flags[3] = flags[7] = flags[11] = 0;

 	/* dump flags */
-	write(1, flags, MAX_NR_KEYMAPS);
+	write(STDOUT_FILENO, flags, MAX_NR_KEYMAPS);

 	for (i = 0; i < MAX_NR_KEYMAPS; i++) {
 		if (flags[i] == 1) {
@ -56,11 +56,14 @@ int dumpkmap_main(int argc, char **argv)
 						(char *)&ke.kb_table,
 						&ke.kb_value)
 				) {
-					write(1, (void*)&ke.kb_value, 2);
+					write(STDOUT_FILENO, (void*)&ke.kb_value, 2);
 				}
 			}
 		}
 	}
-	close(fd);
+	if (ENABLE_FEATURE_CLEAN_UP) {
+		close(fd);
+		RELEASE_CONFIG_BUFFER(flags);
+	}
 	return EXIT_SUCCESS;
 }
--- a/console-tools/kbd_mode.c
+++ b/console-tools/kbd_mode.c
@ -1,6 +1,6 @@
 /* vi: set sw=4 ts=4: */
 /*
- * Mini loadkmap implementation for busybox
+ * Mini kbd_mode implementation for busybox
 *
 * Copyright (C) 2007 Loïc Grenié <loic.grenie@gmail.com>
 *   written using Andries Brouwer <aeb@cwi.nl>'s kbd_mode from
@ -14,54 +14,39 @@
 #include <linux/kd.h>

 int kbd_mode_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
-int kbd_mode_main(int argc, char **argv)
+int kbd_mode_main(int ATTRIBUTE_UNUSED argc, char **argv)
 {
-	static const char opts[] = "saku";
-
-	const char *opt = argv[1];
-	const char *p;
 	int fd;
-
+	unsigned opt;
+	enum {
+		SCANCODE = (1<<0),
+		ASCII	 = (1<<1),
+		MEDIUMRAW= (1<<2),
+		UNICODE	 = (1<<3)
+	};
+	static const char KD_xxx[] ALIGN1 = "saku";
+	opt = getopt32(argv, KD_xxx);
 	fd = get_console_fd();
-	if (fd < 0) /* get_console_fd() already complained */
+/*	if (fd < 0)
 		return EXIT_FAILURE;
+*/
+	if (!opt) { /* print current setting */
+		const char *mode = "unknown";
+		int m;

-	if (opt == NULL) {
-		/* No arg */
-		const char *msg = "unknown";
-		int mode;
-
-		ioctl(fd, KDGKBMODE, &mode);
-		switch(mode) {
-		case K_RAW:
-			msg = "raw (scancode)";
-			break;
-		case K_XLATE:
-			msg = "default (ASCII)";
-			break;
-		case K_MEDIUMRAW:
-			msg = "mediumraw (keycode)";
-			break;
-		case K_UNICODE:
-			msg = "Unicode (UTF-8)";
-			break;
-		}
-		printf("The keyboard is in %s mode\n", msg);
-	}
-	else if (argc > 2 /* more than 1 arg */
-	 || *opt != '-' /* not an option */
-	 || (p = strchr(opts, opt[1])) == NULL /* not an option we expect */
-	 || opt[2] != '\0' /* more than one option char */
-	) {
-		bb_show_usage();
-		/* return EXIT_FAILURE; - not reached */
-	}
-	else {
-#if K_RAW != 0 || K_XLATE != 1 || K_MEDIUMRAW != 2 || K_UNICODE != 3
-#error kbd_mode must be changed
-#endif
-		/* The options are in the order of the various K_xxx */
-		ioctl(fd, KDSKBMODE, p - opts);
+		ioctl(fd, KDGKBMODE, &m);
+		if (m == K_RAW)
+			mode = "raw (scancode)";
+		else if (m == K_XLATE)
+			mode = "default (ASCII)";
+		else if (m == K_MEDIUMRAW)
+			mode = "mediumraw (keycode)";
+		else if (m == K_UNICODE)
+			mode = "Unicode (UTF-8)";
+		printf("The keyboard is in %s mode\n", mode);
+	} else {
+		opt = opt & UNICODE ? 3 : opt >> 1;
+		xioctl(fd, KDSKBMODE, &opt);
 	}

 	if (ENABLE_FEATURE_CLEAN_UP)
--- a/console-tools/loadkmap.c
+++ b/console-tools/loadkmap.c
@ -26,28 +26,26 @@ struct kbentry {
 #define MAX_NR_KEYMAPS  256

 int loadkmap_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
-int loadkmap_main(int argc, char **argv ATTRIBUTE_UNUSED)
+int loadkmap_main(int ATTRIBUTE_UNUSED argc, char **argv ATTRIBUTE_UNUSED)
 {
 	struct kbentry ke;
 	int i, j, fd;
 	uint16_t ibuff[NR_KEYS];
-	char flags[MAX_NR_KEYMAPS];
-	char buff[7];
+	RESERVE_CONFIG_BUFFER(flags,MAX_NR_KEYMAPS);

-	if (argc != 1)
-		bb_show_usage();
+/*  bb_warn_ignoring_args(argc>=2);*/

 	fd = xopen(CURRENT_VC, O_RDWR);

-	xread(0, buff, 7);
-	if (strncmp(buff, BINARY_KEYMAP_MAGIC, 7))
-		bb_error_msg_and_die("this is not a valid binary keymap");
+	xread(STDIN_FILENO, flags, 7);
+	if (strncmp(flags, BINARY_KEYMAP_MAGIC, 7))
+		bb_error_msg_and_die("not a valid binary keymap");

-	xread(0, flags, MAX_NR_KEYMAPS);
+	xread(STDIN_FILENO, flags, MAX_NR_KEYMAPS);

 	for (i = 0; i < MAX_NR_KEYMAPS; i++) {
 		if (flags[i] == 1) {
-			xread(0, ibuff, NR_KEYS * sizeof(uint16_t));
+			xread(STDIN_FILENO, ibuff, NR_KEYS * sizeof(uint16_t));
 			for (j = 0; j < NR_KEYS; j++) {
 				ke.kb_index = j;
 				ke.kb_table = i;
@ -57,6 +55,9 @@ int loadkmap_main(int argc, char **argv ATTRIBUTE_UNUSED)
 		}
 	}

-	if (ENABLE_FEATURE_CLEAN_UP) close(fd);
-	return 0;
+	if (ENABLE_FEATURE_CLEAN_UP) {
+		close(fd);
+		RELEASE_CONFIG_BUFFER(flags);
+	}
+	return EXIT_SUCCESS;
 }
--- a/console-tools/openvt.c
+++ b/console-tools/openvt.c
@ -61,7 +61,8 @@ static int get_vt_fd(void)
 	for (fd = 0; fd < 3; fd++)
 		if (!not_vt_fd(fd))
 			return fd;
-	/* _only_ O_NONBLOCK: ask for neither read not write perms */
+	/* _only_ O_NONBLOCK: ask for neither read nor write perms */
+	/*FIXME: use? device_open(DEV_CONSOLE,0); */
 	fd = open(DEV_CONSOLE, O_NONBLOCK);
 	if (fd >= 0 && !not_vt_fd(fd))
 		return fd;
@ -93,7 +94,7 @@ static NOINLINE void vfork_child(char **argv)
 		/* CHILD */
 		/* Try to make this VT our controlling tty */
 		setsid(); /* lose old ctty */
-		ioctl(0, TIOCSCTTY, 0 /* 0: don't forcibly steal */);
+		ioctl(STDIN_FILENO, TIOCSCTTY, 0 /* 0: don't forcibly steal */);
 		//bb_error_msg("our sid %d", getsid(0));
 		//bb_error_msg("our pgrp %d", getpgrp());
 		//bb_error_msg("VT's sid %d", tcgetsid(0));
@ -135,14 +136,13 @@ int openvt_main(int argc ATTRIBUTE_UNUSED, char **argv)
 	sprintf(vtname, VC_FORMAT, vtno);
 	/* (Try to) clean up stray open fds above fd 2 */
 	bb_daemonize_or_rexec(DAEMON_CLOSE_EXTRA_FDS | DAEMON_ONLY_SANITIZE, NULL);
-	close(0);
+	close(STDIN_FILENO);
 	/*setsid(); - BAD IDEA: after we exit, child is SIGHUPed... */
 	xopen(vtname, O_RDWR);
-	xioctl(0, VT_GETSTATE, &vtstat);
+	xioctl(STDIN_FILENO, VT_GETSTATE, &vtstat);

 	if (flags & OPT_s) {
-		xioctl(0, VT_ACTIVATE, (void*)(ptrdiff_t)vtno);
-		xioctl(0, VT_WAITACTIVE, (void*)(ptrdiff_t)vtno);
+		console_make_active(STDIN_FILENO, vtno);
 	}

 	if (!argv[0]) {
@ -153,14 +153,16 @@ int openvt_main(int argc ATTRIBUTE_UNUSED, char **argv)
 		/*argv[1] = NULL; - already is */
 	}

-	xdup2(0, STDOUT_FILENO);
-	xdup2(0, STDERR_FILENO);
+	xdup2(STDIN_FILENO, STDOUT_FILENO);
+	xdup2(STDIN_FILENO, STDERR_FILENO);

 #ifdef BLOAT
+	{
 	/* Handle -l (login shell) option */
 	const char *prog = argv[0];
 	if (flags & OPT_l)
 		argv[0] = xasprintf("-%s", argv[0]);
+	}
 #endif

 	vfork_child(argv);
@ -168,12 +170,11 @@ int openvt_main(int argc ATTRIBUTE_UNUSED, char **argv)
 		/* We have only one child, wait for it */
 		safe_waitpid(-1, NULL, 0); /* loops on EINTR */
 		if (flags & OPT_s) {
-			xioctl(0, VT_ACTIVATE, (void*)(ptrdiff_t)(vtstat.v_active));
-			xioctl(0, VT_WAITACTIVE, (void*)(ptrdiff_t)(vtstat.v_active));
+			console_make_active(STDIN_FILENO, vtstat.v_active);
 			// Compat: even with -c N (try to) disallocate:
 			// # /usr/app/kbd-1.12/bin/openvt -f -c 9 -ws sleep 5
 			// openvt: could not deallocate console 9
-			xioctl(0, VT_DISALLOCATE, (void*)(ptrdiff_t)vtno);
+			xioctl(STDIN_FILENO, VT_DISALLOCATE, (void*)(ptrdiff_t)vtno);
 		}
 	}
 	return EXIT_SUCCESS;
--- a/console-tools/reset.c
+++ b/console-tools/reset.c
@ -26,7 +26,7 @@ int reset_main(int argc ATTRIBUTE_UNUSED, char **argv ATTRIBUTE_UNUSED)

 	/* no options, no getopt */

-	if (isatty(0) && isatty(1)) {
+	if (isatty(STDIN_FILENO) && isatty(STDOUT_FILENO)) {
 		/* See 'man 4 console_codes' for details:
 		 * "ESC c"			-- Reset
 		 * "ESC ( K"		-- Select user mapping
--- a/console-tools/setconsole.c
+++ b/console-tools/setconsole.c
@ -3,40 +3,34 @@
 *  setconsole.c - redirect system console output
 *
 *  Copyright (C) 2004,2005  Enrik Berkhan <Enrik.Berkhan@inka.de>
+ *  Copyright (C) 2008 Bernhard Fischer
 *
 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
 */

 #include "libbb.h"

-#if ENABLE_FEATURE_SETCONSOLE_LONG_OPTIONS
-static const char setconsole_longopts[] ALIGN1 =
-	"reset\0" No_argument "r"
-	;
-#endif
-
-#define OPT_SETCONS_RESET 1
-
 int setconsole_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
-int setconsole_main(int argc, char **argv)
+int setconsole_main(int ATTRIBUTE_UNUSED argc, char **argv)
 {
-	unsigned long flags;
 	const char *device = CURRENT_TTY;
+	bool reset;

 #if ENABLE_FEATURE_SETCONSOLE_LONG_OPTIONS
+	static const char setconsole_longopts[] ALIGN1 =
+		"reset\0" No_argument "r"
+		;
 	applet_long_options = setconsole_longopts;
 #endif
-	flags = getopt32(argv, "r");
+	/* at most one non-option argument */
+	opt_complementary = "?1";
+	reset = getopt32(argv, "r");

-	if (argc - optind > 1)
-		bb_show_usage();
-
-	if (argc - optind == 1) {
-		if (flags & OPT_SETCONS_RESET)
-			bb_show_usage();
-		device = argv[optind];
+	argv += 1 + reset;
+	if (*argv) {
+		device = *argv;
 	} else {
-		if (flags & OPT_SETCONS_RESET)
+		if (reset)
 			device = DEV_CONSOLE;
 	}

--- a/console-tools/setlogcons.c
+++ b/console-tools/setlogcons.c
@ -17,15 +17,14 @@ int setlogcons_main(int argc ATTRIBUTE_UNUSED, char **argv)
 	struct {
 		char fn;
 		char subarg;
-	} arg;
-
-	arg.fn = 11;    /* redirect kernel messages */
-	arg.subarg = 0; /* to specified console (current as default) */
+	} arg = { 11, /* redirect kernel messages */
+			  0   /* to specified console (current as default) */
+			};

 	if (argv[1])
 		arg.subarg = xatou_range(argv[1], 0, 63);

 	xioctl(xopen(VC_1, O_RDONLY), TIOCLINUX, &arg);

-	return 0;
+	return EXIT_SUCCESS;
 }
--- a/include/libbb.h
+++ b/include/libbb.h
@ -281,8 +281,9 @@ extern int recursive_action(const char *fileName, unsigned flags,
 	void* userData, unsigned depth);
 extern int device_open(const char *device, int mode);
 enum { GETPTY_BUFSIZE = 16 }; /* more than enough for "/dev/ttyXXX" */
-extern int getpty(char *line);
+extern int xgetpty(char *line);
 extern int get_console_fd(void);
+extern void console_make_active(int fd, const int vt_num);
 extern char *find_block_device(const char *path);
 /* bb_copyfd_XX print read/write errors and return -1 if they occur */
 extern off_t bb_copyfd_eof(int fd1, int fd2);
@ -590,6 +591,7 @@ extern ssize_t safe_write(int fd, const void *buf, size_t count);
 // if some data was written before error occurred
 extern ssize_t full_write(int fd, const void *buf, size_t count);
 extern void xwrite(int fd, const void *buf, size_t count);
+extern void xopen_xwrite_close(const char* file, const char *str);

 /* Reads and prints to stdout till eof, then closes FILE. Exits on error: */
 extern void xprint_and_close_file(FILE *file);
--- a/include/usage.h
+++ b/include/usage.h
@ -875,7 +875,7 @@
 #define dumpkmap_trivial_usage \
       "> keymap"
 #define dumpkmap_full_usage "\n\n" \
-       "Print out a binary keyboard translation table to standard output"
+       "Print a binary keyboard translation table to standard output"
 #define dumpkmap_example_usage \
       "$ dumpkmap > keymap\n"

--- a/libbb/Kbuild
+++ b/libbb/Kbuild
@ -98,6 +98,7 @@ lib-y += vfork_daemon_rexec.o
 lib-y += warn_ignoring_args.o
 lib-y += wfopen.o
 lib-y += wfopen_input.o
+lib-y += write.o
 lib-y += xatonum.o
 lib-y += xconnect.o
 lib-y += xfuncs.o
--- a/libbb/get_console.c
+++ b/libbb/get_console.c
@ -8,10 +8,8 @@
 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
 */

-//#include <sys/ioctl.h>
 #include "libbb.h"

-
 /* From <linux/kd.h> */
 enum { KDGKBTYPE = 0x4B33 };  /* get keyboard type */

@ -70,3 +68,15 @@ int get_console_fd(void)
 	bb_error_msg("can't open console");
 	return fd;                      /* total failure */
 }
+
+/* From <linux/vt.h> */
+enum {
+	VT_ACTIVATE = 0x5606,   /* make vt active */
+	VT_WAITACTIVE = 0x5607  /* wait for vt active */
+};
+
+void console_make_active(int fd, const int vt_num)
+{
+	xioctl(fd, VT_ACTIVATE, (void *)(ptrdiff_t)vt_num);
+	xioctl(fd, VT_WAITACTIVE, (void *)(ptrdiff_t)vt_num);
+}
--- a/libbb/getpty.c
+++ b/libbb/getpty.c
@ -10,7 +10,7 @@

 #define DEBUG 0

-int getpty(char *line)
+int xgetpty(char *line)
 {
 	int p;
 #if ENABLE_FEATURE_DEVPTS
@ -22,7 +22,7 @@ int getpty(char *line)
 		name = ptsname(p);
 		if (!name) {
 			bb_perror_msg("ptsname error (is /dev/pts mounted?)");
-			return -1;
+			goto fail;
 		}
 		safe_strncpy(line, name, GETPTY_BUFSIZE);
 		return p;
@ -52,7 +52,9 @@ int getpty(char *line)
 		}
 	}
 #endif /* FEATURE_DEVPTS */
-	return -1;
+USE_FEATURE_DEVPTS( fail:)
+	bb_error_msg_and_die("open pty");
+	return -1; /* never get here */
 }


--- a/libbb/write.c
+++ b/libbb/write.c
@ -0,0 +1,20 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * Utility routines.
+ *
+ * Copyright (C) 2008 Bernhard Fischer
+ *
+ * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
+ */
+
+#include "libbb.h"
+
+/* Open file and write string str to it, close file.
+ * Die on any open or write-error.  */
+void xopen_xwrite_close(const char* file, const char* str)
+{
+	int fd = xopen(file, O_WRONLY);
+
+	xwrite(fd, str, strlen(str));
+	close(fd);
+}
--- a/networking/telnetd.c
+++ b/networking/telnetd.c
@ -164,11 +164,7 @@ make_new_session(
 	/*ts->buf2 = ts->buf1 + BUFSIZE;*/

 	/* Got a new connection, set up a tty. */
-	fd = getpty(tty_name);
-	if (fd < 0) {
-		bb_error_msg("can't create pty");
-		return NULL;
-	}
+	fd = xgetpty(tty_name);
 	if (fd > maxfd)
 		maxfd = fd;
 	ts->ptyfd = fd;
--- a/scripts/defconfig
+++ b/scripts/defconfig
@ -516,7 +516,7 @@ CONFIG_FEATURE_MOUNT_FSTAB=y
 CONFIG_PIVOT_ROOT=y
 CONFIG_RDATE=y
 CONFIG_READPROFILE=y
-# CONFIG_RTCWAKE is not set
+CONFIG_RTCWAKE=y
 CONFIG_SETARCH=y
 CONFIG_SWAPONOFF=y
 CONFIG_SWITCH_ROOT=y
@ -534,10 +534,10 @@ CONFIG_FEATURE_MOUNT_LOOP=y
 #
 CONFIG_ADJTIMEX=y
 # CONFIG_BBCONFIG is not set
-# CONFIG_CHAT is not set
-# CONFIG_FEATURE_CHAT_NOFAIL is not set
+CONFIG_CHAT=y
+CONFIG_FEATURE_CHAT_NOFAIL=y
 # CONFIG_FEATURE_CHAT_TTY_HIFI is not set
-# CONFIG_FEATURE_CHAT_IMPLICIT_CR is not set
+CONFIG_FEATURE_CHAT_IMPLICIT_CR=y
 # CONFIG_FEATURE_CHAT_SWALLOW_OPTS is not set
 # CONFIG_FEATURE_CHAT_SEND_ESCAPES is not set
 # CONFIG_FEATURE_CHAT_VAR_ABORT_LEN is not set
--- a/util-linux/rtcwake.c
+++ b/util-linux/rtcwake.c
@ -30,7 +30,7 @@

 static time_t rtc_time;

-static int may_wakeup(const char *rtcname)
+static bool may_wakeup(const char *rtcname)
 {
 	ssize_t ret;
 	char buf[128];
@ -42,7 +42,7 @@ static int may_wakeup(const char *rtcname)
 	snprintf(buf, sizeof(buf), SYS_RTC_PATH, rtcname);
 	ret = open_read_close(buf, buf, sizeof(buf));
 	if (ret < 0)
-		return 0;
+		return false;

 	/* wakeup events could be disabled or not supported */
 	return strncmp(buf, "enabled\n", 8) == 0;
@ -89,15 +89,6 @@ static void setup_alarm(int fd, time_t *wakeup)
 	}
 }

-static void suspend_system(const char *suspend)
-{
-	FILE *f = xfopen(SYS_POWER_PATH, "w");
-	fprintf(f, "%s\n", suspend);
-	fflush(f);
-	/* this executes after wake from suspend */
-	fclose(f);
-}
-
 #define RTCWAKE_OPT_AUTO         0x01
 #define RTCWAKE_OPT_LOCAL        0x02
 #define RTCWAKE_OPT_UTC          0x04
@ -185,7 +176,7 @@ int rtcwake_main(int argc ATTRIBUTE_UNUSED, char **argv)
 	usleep(10 * 1000);

 	if (strcmp(suspend, "on"))
-		suspend_system(suspend);
+		xopen_xwrite_close(SYS_POWER_PATH, suspend);
 	else {
 		/* "fake" suspend ... we'll do the delay ourselves */
 		unsigned long data;
--- a/util-linux/script.c
+++ b/util-linux/script.c
@ -69,10 +69,7 @@ int script_main(int argc ATTRIBUTE_UNUSED, char **argv)
 		shell = DEFAULT_SHELL;
 	}

-	pty = getpty(pty_line);
-	if (pty < 0) {
-		bb_perror_msg_and_die("can't get pty");
-	}
+	pty = xgetpty(pty_line);

 	/* get current stdin's tty params */
 	attr_ok = tcgetattr(0, &tt);