From: Ben Gras <ben@minix3.org>
Date: Mon, 21 Feb 2011 15:05:32 +0000 (+0000)
Subject: mark forked process as such in the kernel p_name
X-Git-Tag: v3.2.0~658
X-Git-Url: http://zhaoyanbai.com/repos/icons/debian/static/man.7.txt?a=commitdiff_plain;h=c6e6aa8850473a822847fb5bde1fa4b82c40341d;p=minix.git

mark forked process as such in the kernel p_name

  . helps debugging output; you can see the difference
    between parent and child easily (it's sometimes
    confusing to see an expected endpoint number with
    an unexpected name, i.e. before exec())
  . when processes crash after fork and before exec, it's
    an instant hint that that's what's going on, instead of
    it being the parent (endpoint numbers don't usually convey
    this)
  . name returns to 'normal' after exec(), so *F isn't visible
    normally at all. (Except for for RS which forks apparently.)
---

diff --git a/kernel/system/do_fork.c b/kernel/system/do_fork.c
index eac87ea00..0b6236196 100644
--- a/kernel/system/do_fork.c
+++ b/kernel/system/do_fork.c
@@ -34,6 +34,7 @@ PUBLIC int do_fork(struct proc * caller, message * m_ptr)
   struct mem_map *map_ptr;	/* virtual address of map inside caller (PM) */
   int gen, r;
   int p_proc;
+  int namelen;
 
   if(!isokendpt(m_ptr->PR_ENDPT, &p_proc))
 	return EINVAL;
@@ -84,6 +85,12 @@ PUBLIC int do_fork(struct proc * caller, message * m_ptr)
   rpc->p_virt_left = 0;		/* disable, clear the process-virtual timers */
   rpc->p_prof_left = 0;
 
+  /* Mark process name as being a forked copy */
+  namelen = strlen(rpc->p_name);
+#define FORKSTR "*F"
+  if(namelen+strlen(FORKSTR) < sizeof(rpc->p_name))
+	strcat(rpc->p_name, FORKSTR);
+
   /* the child process is not runnable until it's scheduled. */
   RTS_SET(rpc, RTS_NO_QUANTUM);
   reset_proc_accounting(rpc);