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init: remove superfluous forks and messing up with argv[0]

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cttyhack: add stealing of ctty
This commit is contained in:
Denis Vlasenko
2007-12-10 07:06:04 +00:00
parent 191836845e
commit 2afabe8b83
5 changed files with 141 additions and 135 deletions
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22
shell/cttyhack.c
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@ -1,16 +1,18 @@
/* This code is adapted from busybox project
*
/* vi: set sw=4 ts=4: */
/*
* Licensed under GPLv2
*
* Copyright (c) 2007 Denys Vlasenko <vda.linux@googlemail.com>
*/
#include "libbb.h"
/* From <linux/vt.h> */
struct vt_stat {
unsigned short v_active; /* active vt */
unsigned short v_signal; /* signal to send */
unsigned short v_state; /* vt bitmask */
unsigned short v_active; /* active vt */
unsigned short v_signal; /* signal to send */
unsigned short v_state; /* vt bitmask */
};
enum { VT_GETSTATE = 0x5603 }; /* get global vt state info */
enum { VT_GETSTATE = 0x5603 }; /* get global vt state info */
/* From <linux/serial.h> */
struct serial_struct {
@ -26,8 +28,8 @@ struct serial_struct {
char io_type;
char reserved_char[1];
int hub6;
unsigned short closing_wait; /* time to wait before closing */
unsigned short closing_wait2; /* no longer used... */
unsigned short closing_wait; /* time to wait before closing */
unsigned short closing_wait2; /* no longer used... */
unsigned char *iomem_base;
unsigned short iomem_reg_shift;
unsigned int port_high;
@ -66,8 +68,10 @@ int cttyhack_main(int argc, char **argv)
dup2(fd, 1);
dup2(fd, 2);
while (fd > 2) close(fd--);
/* Some other session may have it as ctty. Steal it from them */
ioctl(0, TIOCSCTTY, 1)
}
execvp(argv[0], argv);
BB_EXECVP(argv[0], argv);
bb_perror_msg_and_die("cannot exec '%s'", argv[0]);
}