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authorGravatar Nicolas Carrier <nicolas.carrier@parrot.com>2016-02-04 12:18:01 +0100
committerGravatar Denys Vlasenko <vda.linux@googlemail.com>2016-02-11 14:23:33 +0100
commit29eae728e959a382841bd0a32cc1a8d1bcdc9150 (patch)
tree7ccda1c300308023aa99b0b358db1f0571a0b561 /init/init.c
parent383201e7258c3c1646f6d5cab4e813b5c3b3ecd0 (diff)
downloadbusybox-29eae728e959a382841bd0a32cc1a8d1bcdc9150.tar.gz
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init: make the command-line rewrite optional
When launched as PID 1 and after parsing its arguments, init wipes all all of them except argv[0] and rewrites argv[0] to contain only "init", so that its command-line appears solely as "init" in tools such as ps. This patch adds the FEATURE_INIT_MODIFY_CMDLINE which, if set to n, will make init preserve all its arguments including argv[0], be they parsed or ignored. The original command-line used to launch init can then be retrieved in /proc/1/cmdline on Linux, for example. Signed-off-by: Nicolas Carrier <nicolas.carrier@parrot.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Diffstat (limited to 'init/init.c')
-rw-r--r--init/init.c27
1 files changed, 22 insertions, 5 deletions
diff --git a/init/init.c b/init/init.c
index 2040a59e8..25bfaec8c 100644
--- a/init/init.c
+++ b/init/init.c
@@ -102,6 +102,21 @@
//config:
//config: Note that on Linux, init attempts to detect serial terminal and
//config: sets TERM to "vt102" if one is found.
+//config:
+//config:config FEATURE_INIT_MODIFY_CMDLINE
+//config: bool "Modify the command-line to \"init\""
+//config: default y
+//config: depends on INIT
+//config: help
+//config: When launched as PID 1 and after parsing its arguments, init
+//config: wipes all the arguments but argv[0] and rewrites argv[0] to
+//config: contain only "init", so that its command-line appears solely as
+//config: "init" in tools such as ps.
+//config: If this option is set to Y, init will keep its original behavior,
+//config: otherwise, all the arguments including argv[0] will be preserved,
+//config: be they parsed or ignored by init.
+//config: The original command-line used to launch init can then be
+//config: retrieved in /proc/1/cmdline on Linux, for example.
//applet:IF_INIT(APPLET(init, BB_DIR_SBIN, BB_SUID_DROP))
//applet:IF_FEATURE_INITRD(APPLET_ODDNAME(linuxrc, init, BB_DIR_ROOT, BB_SUID_DROP, linuxrc))
@@ -1138,11 +1153,13 @@ int init_main(int argc UNUSED_PARAM, char **argv)
}
#endif
- /* Make the command line just say "init" - thats all, nothing else */
- strncpy(argv[0], "init", strlen(argv[0]));
- /* Wipe argv[1]-argv[N] so they don't clutter the ps listing */
- while (*++argv)
- nuke_str(*argv);
+ if (ENABLE_FEATURE_INIT_MODIFY_CMDLINE) {
+ /* Make the command line just say "init" - that's all, nothing else */
+ strncpy(argv[0], "init", strlen(argv[0]));
+ /* Wipe argv[1]-argv[N] so they don't clutter the ps listing */
+ while (*++argv)
+ nuke_str(*argv);
+ }
/* Set up signal handlers */
if (!DEBUG_INIT) {