From dea478855f8de7fe0974f5cbb5fa3f5968c46302 Mon Sep 17 00:00:00 2001
From: Denys Vlasenko <vda.linux@googlemail.com>
Date: Fri, 9 Oct 2009 15:40:49 +0200
Subject: hush: support $PPID
function old new delta
get_local_var_value 33 72 +39
hush_main 951 983 +32
block_signals 152 155 +3
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 3/0 up/down: 74/0) Total: 74 bytes
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
---
shell/hush.c | 19 +++++++++++++++----
1 file changed, 15 insertions(+), 4 deletions(-)
diff --git a/shell/hush.c b/shell/hush.c
index ec38023ff..3028d795c 100644
--- a/shell/hush.c
+++ b/shell/hush.c
@@ -484,6 +484,7 @@ struct globals {
line_input_t *line_input_state;
#endif
pid_t root_pid;
+ pid_t root_ppid;
pid_t last_bg_pid;
#if ENABLE_HUSH_JOB
int run_list_level;
@@ -1307,6 +1308,9 @@ static const char *get_local_var_value(const char *name)
struct variable **pp = get_ptr_to_local_var(name);
if (pp)
return strchr((*pp)->varstr, '=') + 1;
+ if (strcmp(name, "PPID") == 0)
+ return utoa(G.root_ppid);
+ // bash compat: UID? EUID?
return NULL;
}
@@ -2687,8 +2691,9 @@ static void re_execute_shell(char ***to_free, const char *s,
if (pp) while (*pp++)
cnt++;
- sprintf(param_buf, "-$%x:%x:%x:%x" IF_HUSH_LOOPS(":%x")
+ sprintf(param_buf, "-$%x:%x:%x:%x:%x" IF_HUSH_LOOPS(":%x")
, (unsigned) G.root_pid
+ , (unsigned) G.root_ppid
, (unsigned) G.last_bg_pid
, (unsigned) G.last_exitcode
, cnt
@@ -6510,7 +6515,7 @@ int hush_main(int argc, char **argv)
* MACHTYPE=i386-pc-linux-gnu
* OSTYPE=linux-gnu
* HOSTNAME=<xxxxxxxxxx>
- * PPID=<NNNNN>
+ * PPID=<NNNNN> - we also do it elsewhere
* EUID=<NNNNN>
* UID=<NNNNN>
* GROUPS=()
@@ -6587,8 +6592,10 @@ int hush_main(int argc, char **argv)
* Note: this form never happens:
* sh ... -c 'builtin' [BARGV...] ""
*/
- if (!G.root_pid)
+ if (!G.root_pid) {
G.root_pid = getpid();
+ G.root_ppid = getppid();
+ }
G.global_argv = argv + optind;
G.global_argc = argc - optind;
if (builtin_argc) {
@@ -6630,6 +6637,8 @@ int hush_main(int argc, char **argv)
case '$':
G.root_pid = bb_strtou(optarg, &optarg, 16);
optarg++;
+ G.root_ppid = bb_strtou(optarg, &optarg, 16);
+ optarg++;
G.last_bg_pid = bb_strtou(optarg, &optarg, 16);
optarg++;
G.last_exitcode = bb_strtou(optarg, &optarg, 16);
@@ -6670,8 +6679,10 @@ int hush_main(int argc, char **argv)
}
} /* option parsing loop */
- if (!G.root_pid)
+ if (!G.root_pid) {
G.root_pid = getpid();
+ G.root_ppid = getppid();
+ }
/* If we are login shell... */
if (argv[0] && argv[0][0] == '-') {
--
cgit v1.2.3-55-g6feb