[PATCH 4/6] renice: improve messages specifying what ID is referring to

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This version makes more clear the printed message specially when the
--user option is used.

Old version:
    $ renice 19 10 -u fra -g 1
renice: 10: setpriority: Operation not permitted
renice: 1000: setpriority: Operation not permitted
renice: 1: setpriority: Operation not permitted

    $ renice 19 -u fra
1000: old priority 0, new priority 19

New version:
    $ renice 19 10 -u fra -g 1
renice: failed to set priority for process ID 10: Operation not permitted
renice: failed to set priority for user ID 1000: Operation not permitted
renice: failed to set priority for process group ID 1: Operation not permitted

    $ renice 19 -u fra
user ID 1000 old priority 0, new priority 19

Signed-off-by: Francesco Cosoleto <cosoleto@xxxxxxxxx>
---
 sys-utils/renice.c |   16 +++++++++++-----
 1 files changed, 11 insertions(+), 5 deletions(-)

diff --git a/sys-utils/renice.c b/sys-utils/renice.c
index d804ca9..ff4c443 100644
--- a/sys-utils/renice.c
+++ b/sys-utils/renice.c
@@ -151,25 +151,31 @@ main(int argc, char **argv)
 static int
 donice(int which, int who, int prio) {
 	int oldprio, newprio;
+	const char *idtype = _("process ID");
+
+	if (which == PRIO_USER)
+		idtype = _("user ID");
+	else if (which == PRIO_PGRP)
+		idtype = _("process group ID");
 
 	errno = 0;
 	oldprio = getpriority(which, who);
 	if (oldprio == -1 && errno) {
-		warn(_("%d: getpriority"), who);
+		warn(_("failed to get priority for %s %d"), idtype, who);
 		return 1;
 	}
 	if (setpriority(which, who, prio) < 0) {
-		warn(_("%d: setpriority"), who);
+		warn(_("failed to set priority for %s %d"), idtype, who);
 		return 1;
 	}
 	errno = 0;
 	newprio = getpriority(which, who);
 	if (newprio == -1 && errno) {
-		warn(_("%d: getpriority"), who);
+		warn(_("failed to get priority for %s %d"), idtype, who);
 		return 1;
 	}
 
-	printf(_("%d: old priority %d, new priority %d\n"),
-	       who, oldprio, newprio);
+	printf(_("%s %d old priority %d, new priority %d\n"),
+	       idtype, who, oldprio, newprio);
 	return 0;
 }
-- 
1.7.1

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