[PATCH 04/15] prlimit: add warning diagnostic when attempting to change prlimit's limits

[Bernhard Voelker <mail@bernhard-voelker.de>]

[PATCH 04/15] prlimit: add warning diagnostic when attempting to change 
prlimit's limits

Setting the limits of the prlimit process is useless because it will
exit shortly anyway. To help the user not to fall into this trap,
prlimit now displays a warning.

Signed-off-by: Bernhard Voelker <mail@bernhard-voelker.de>
---
  sys-utils/prlimit.c |    7 +++++--
  1 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/sys-utils/prlimit.c b/sys-utils/prlimit.c
index 6943d11..9a52b81 100644
--- a/sys-utils/prlimit.c
+++ b/sys-utils/prlimit.c
@@ -302,10 +302,13 @@ static void do_prlimit(struct prlimit lims[], 
size_t n, int tt_flags)
  	for (i = 0; i < n; i++) {
  		struct rlimit *new = NULL;

-		if (lims[i].modify)
+		if (lims[i].modify) {
+			if (!pid)
+				warnx(_("setting limits of the prlimit process is pointless"));
  			new = &lims[i].rlim;
-		else
+		} else {
  			nshows++;
+		}

  		if (verbose && new) {
  			printf(_("New %s limit: "), lims[i].desc->name);