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-rw-r--r--init/init.c41
1 files changed, 21 insertions, 20 deletions
diff --git a/init/init.c b/init/init.c
index 25bfaec8c..6eb76b80e 100644
--- a/init/init.c
+++ b/init/init.c
@@ -16,10 +16,21 @@
16//config: help 16//config: help
17//config: init is the first program run when the system boots. 17//config: init is the first program run when the system boots.
18//config: 18//config:
19//config:config LINUXRC
20//config: bool "Support running init from within an initrd (not initramfs)"
21//config: default y
22//config: select FEATURE_SYSLOG
23//config: help
24//config: Legacy support for running init under the old-style initrd. Allows
25//config: the name linuxrc to act as init, and it doesn't assume init is PID 1.
26//config:
27//config: This does not apply to initramfs, which runs /init as PID 1 and
28//config: requires no special support.
29//config:
19//config:config FEATURE_USE_INITTAB 30//config:config FEATURE_USE_INITTAB
20//config: bool "Support reading an inittab file" 31//config: bool "Support reading an inittab file"
21//config: default y 32//config: default y
22//config: depends on INIT 33//config: depends on INIT || LINUXRC
23//config: help 34//config: help
24//config: Allow init to read an inittab file when the system boot. 35//config: Allow init to read an inittab file when the system boot.
25//config: 36//config:
@@ -46,7 +57,7 @@
46//config:config FEATURE_INIT_SCTTY 57//config:config FEATURE_INIT_SCTTY
47//config: bool "Run commands with leading dash with controlling tty" 58//config: bool "Run commands with leading dash with controlling tty"
48//config: default y 59//config: default y
49//config: depends on INIT 60//config: depends on INIT || LINUXRC
50//config: help 61//config: help
51//config: If this option is enabled, init will try to give a controlling 62//config: If this option is enabled, init will try to give a controlling
52//config: tty to any command which has leading hyphen (often it's "-/bin/sh"). 63//config: tty to any command which has leading hyphen (often it's "-/bin/sh").
@@ -61,40 +72,29 @@
61//config:config FEATURE_INIT_SYSLOG 72//config:config FEATURE_INIT_SYSLOG
62//config: bool "Enable init to write to syslog" 73//config: bool "Enable init to write to syslog"
63//config: default y 74//config: default y
64//config: depends on INIT 75//config: depends on INIT || LINUXRC
65//config: 76//config:
66//config:config FEATURE_EXTRA_QUIET 77//config:config FEATURE_EXTRA_QUIET
67//config: bool "Be _extra_ quiet on boot" 78//config: bool "Be _extra_ quiet on boot"
68//config: default y 79//config: default y
69//config: depends on INIT 80//config: depends on INIT || LINUXRC
70//config: help 81//config: help
71//config: Prevent init from logging some messages to the console during boot. 82//config: Prevent init from logging some messages to the console during boot.
72//config: 83//config:
73//config:config FEATURE_INIT_COREDUMPS 84//config:config FEATURE_INIT_COREDUMPS
74//config: bool "Support dumping core for child processes (debugging only)" 85//config: bool "Support dumping core for child processes (debugging only)"
75//config: default y 86//config: default y
76//config: depends on INIT 87//config: depends on INIT || LINUXRC
77//config: help 88//config: help
78//config: If this option is enabled and the file /.init_enable_core 89//config: If this option is enabled and the file /.init_enable_core
79//config: exists, then init will call setrlimit() to allow unlimited 90//config: exists, then init will call setrlimit() to allow unlimited
80//config: core file sizes. If this option is disabled, processes 91//config: core file sizes. If this option is disabled, processes
81//config: will not generate any core files. 92//config: will not generate any core files.
82//config: 93//config:
83//config:config FEATURE_INITRD
84//config: bool "Support running init from within an initrd (not initramfs)"
85//config: default y
86//config: depends on INIT
87//config: help
88//config: Legacy support for running init under the old-style initrd. Allows
89//config: the name linuxrc to act as init, and it doesn't assume init is PID 1.
90//config:
91//config: This does not apply to initramfs, which runs /init as PID 1 and
92//config: requires no special support.
93//config:
94//config:config INIT_TERMINAL_TYPE 94//config:config INIT_TERMINAL_TYPE
95//config: string "Initial terminal type" 95//config: string "Initial terminal type"
96//config: default "linux" 96//config: default "linux"
97//config: depends on INIT 97//config: depends on INIT || LINUXRC
98//config: help 98//config: help
99//config: This is the initial value set by init for the TERM environment 99//config: This is the initial value set by init for the TERM environment
100//config: variable. This variable is used by programs which make use of 100//config: variable. This variable is used by programs which make use of
@@ -106,7 +106,7 @@
106//config:config FEATURE_INIT_MODIFY_CMDLINE 106//config:config FEATURE_INIT_MODIFY_CMDLINE
107//config: bool "Modify the command-line to \"init\"" 107//config: bool "Modify the command-line to \"init\""
108//config: default y 108//config: default y
109//config: depends on INIT 109//config: depends on INIT || LINUXRC
110//config: help 110//config: help
111//config: When launched as PID 1 and after parsing its arguments, init 111//config: When launched as PID 1 and after parsing its arguments, init
112//config: wipes all the arguments but argv[0] and rewrites argv[0] to 112//config: wipes all the arguments but argv[0] and rewrites argv[0] to
@@ -119,9 +119,10 @@
119//config: retrieved in /proc/1/cmdline on Linux, for example. 119//config: retrieved in /proc/1/cmdline on Linux, for example.
120 120
121//applet:IF_INIT(APPLET(init, BB_DIR_SBIN, BB_SUID_DROP)) 121//applet:IF_INIT(APPLET(init, BB_DIR_SBIN, BB_SUID_DROP))
122//applet:IF_FEATURE_INITRD(APPLET_ODDNAME(linuxrc, init, BB_DIR_ROOT, BB_SUID_DROP, linuxrc)) 122//applet:IF_LINUXRC(APPLET_ODDNAME(linuxrc, init, BB_DIR_ROOT, BB_SUID_DROP, linuxrc))
123 123
124//kbuild:lib-$(CONFIG_INIT) += init.o 124//kbuild:lib-$(CONFIG_INIT) += init.o
125//kbuild:lib-$(CONFIG_LINUXRC) += init.o
125 126
126#define DEBUG_SEGV_HANDLER 0 127#define DEBUG_SEGV_HANDLER 0
127 128
@@ -1057,7 +1058,7 @@ int init_main(int argc UNUSED_PARAM, char **argv)
1057 if (!DEBUG_INIT) { 1058 if (!DEBUG_INIT) {
1058 /* Expect to be invoked as init with PID=1 or be invoked as linuxrc */ 1059 /* Expect to be invoked as init with PID=1 or be invoked as linuxrc */
1059 if (getpid() != 1 1060 if (getpid() != 1
1060 && (!ENABLE_FEATURE_INITRD || applet_name[0] != 'l') /* not linuxrc? */ 1061 && (!ENABLE_LINUXRC || applet_name[0] != 'l') /* not linuxrc? */
1061 ) { 1062 ) {
1062 bb_error_msg_and_die("must be run as PID 1"); 1063 bb_error_msg_and_die("must be run as PID 1");
1063 } 1064 }