From 51e158c12aca3c9ac63988611a97c05109b14dc9 Mon Sep 17 00:00:00 2001 From: Rusty Russell Date: Mon, 28 Apr 2014 11:34:33 +0930 Subject: param: hand arguments after -- straight to init The kernel passes any args it doesn't need through to init, except it assumes anything containing '.' belongs to the kernel (for a module). This change means all users can clearly distinguish which arguments are for init. For example, the kernel uses debug ("dee-bug") to mean log everything to the console, where systemd uses the debug from the Scandinavian "day-boog" meaning "fail to boot". If a future versions uses argv[] instead of reading /proc/cmdline, this confusion will be avoided. eg: test 'FOO="this is --foo"' -- 'systemd.debug="true true true"' Gives: argv[0] = '/debug-init' argv[1] = 'test' argv[2] = 'systemd.debug=true true true' envp[0] = 'HOME=/' envp[1] = 'TERM=linux' envp[2] = 'FOO=this is --foo' Signed-off-by: Rusty Russell --- kernel/params.c | 25 ++++++++++++++----------- 1 file changed, 14 insertions(+), 11 deletions(-) (limited to 'kernel/params.c') diff --git a/kernel/params.c b/kernel/params.c index b00142e7f3ba..1e52ca233fd9 100644 --- a/kernel/params.c +++ b/kernel/params.c @@ -177,13 +177,13 @@ static char *next_arg(char *args, char **param, char **val) } /* Args looks like "foo=bar,bar2 baz=fuz wiz". */ -int parse_args(const char *doing, - char *args, - const struct kernel_param *params, - unsigned num, - s16 min_level, - s16 max_level, - int (*unknown)(char *param, char *val, const char *doing)) +char *parse_args(const char *doing, + char *args, + const struct kernel_param *params, + unsigned num, + s16 min_level, + s16 max_level, + int (*unknown)(char *param, char *val, const char *doing)) { char *param, *val; @@ -198,6 +198,9 @@ int parse_args(const char *doing, int irq_was_disabled; args = next_arg(args, ¶m, &val); + /* Stop at -- */ + if (!val && strcmp(param, "--") == 0) + return args; irq_was_disabled = irqs_disabled(); ret = parse_one(param, val, doing, params, num, min_level, max_level, unknown); @@ -208,22 +211,22 @@ int parse_args(const char *doing, switch (ret) { case -ENOENT: pr_err("%s: Unknown parameter `%s'\n", doing, param); - return ret; + return ERR_PTR(ret); case -ENOSPC: pr_err("%s: `%s' too large for parameter `%s'\n", doing, val ?: "", param); - return ret; + return ERR_PTR(ret); case 0: break; default: pr_err("%s: `%s' invalid for parameter `%s'\n", doing, val ?: "", param); - return ret; + return ERR_PTR(ret); } } /* All parsed OK. */ - return 0; + return NULL; } /* Lazy bastard, eh? */ -- cgit v1.2.3-58-ga151