From f95ca97d1bb94307ee0b8ed95d329dc9d6ccec85 Mon Sep 17 00:00:00 2001
From: John Beppu <beppu@lbox.org>
Date: Thu, 9 Dec 1999 22:10:18 +0000
Subject: findInitPid() has been implemented and it seems to work.
reboot has been changed to take advantage of findInitPid();
---
init/reboot.c | 3 ++-
internal.h | 1 +
reboot.c | 3 ++-
utility.c | 43 ++++++++++++++++++++++++++++++++++---------
4 files changed, 39 insertions(+), 11 deletions(-)
diff --git a/init/reboot.c b/init/reboot.c
index 53a3520e1..17ec9f82f 100644
--- a/init/reboot.c
+++ b/init/reboot.c
@@ -26,5 +26,6 @@
extern int
reboot_main(int argc, char ** argv)
{
- exit( kill(1, SIGUSR2));
+ /* don't assume init's pid == 1 */
+ exit( kill(findInitPid(), SIGUSR2));
}
diff --git a/internal.h b/internal.h
index 830d30eb4..de13bb202 100644
--- a/internal.h
+++ b/internal.h
@@ -157,6 +157,7 @@ extern void write_mtab(char* blockDevice, char* directory,
extern void erase_mtab(const char * name);
extern int check_wildcard_match(const char* text, const char* pattern);
extern long getNum (const char *cp);
+extern pid_t findInitPid();
#if defined BB_MTAB
diff --git a/reboot.c b/reboot.c
index 53a3520e1..17ec9f82f 100644
--- a/reboot.c
+++ b/reboot.c
@@ -26,5 +26,6 @@
extern int
reboot_main(int argc, char ** argv)
{
- exit( kill(1, SIGUSR2));
+ /* don't assume init's pid == 1 */
+ exit( kill(findInitPid(), SIGUSR2));
}
diff --git a/utility.c b/utility.c
index de7a0fbfc..42ee00c50 100644
--- a/utility.c
+++ b/utility.c
@@ -1068,14 +1068,39 @@ extern long getNum (const char *cp)
}
#endif
+#if 1
+/* findInitPid()
+ *
+ * This finds the pid of init (which is not always 1).
+ * Currently, it's implemented by rummaging through the proc filesystem.
+ *
+ * [return]
+ * 0 failure
+ * pid when init's pid is found.
+ */
+extern pid_t
+findInitPid()
+{
+ pid_t init_pid;
+ char filename[256];
+ char buffer[256];
+
+ /* no need to opendir ;) */
+ for (init_pid = 1; init_pid < 65536; init_pid++) {
+ FILE *status;
+
+ sprintf(filename, "/proc/%d/status", init_pid);
+ status = fopen(filename, "r");
+ if (!status) { continue; }
+ fgets(buffer, 256, status);
+ fclose(status);
+
+ if ( (strcmp(&buffer[6], "init\n") == 0)) {
+ return init_pid;
+ }
+ }
+ return 0;
+}
+#endif
/* END CODE */
-
-
-
-
-
-
-
-
-
--
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