s6-softlimit: add -P option for RLIMIT_RTPRIO

Bash ulimit uses -r for this, but in s6-softlimit that was already
taken.  I could have used -R, but Bash uses that for RLIMIT_RTTIME, so
I didn't want to claim that one and create a similarly difficult
decision for somebody adding that in future.  I decided to use -P (for
"priority") as the least bad still-available option.

1 files changed, 6 insertions, 1 deletions

diff --git a/src/daemontools-extras/s6-softlimit.c b/src/daemontools-extras/s6-softlimit.c
index d6112b2..beb7325 100644
--- a/src/daemontools-extras/s6-softlimit.c
+++ b/src/daemontools-extras/s6-softlimit.c
@@ -41,7 +41,7 @@ int main (int argc, char const *const *argv)
   PROG = "s6-softlimit" ;
   for (;;)
   {
-    int opt = subgetopt_r(argc, argv, "hHa:c:d:f:l:m:o:p:r:s:t:", &l) ;
+    int opt = subgetopt_r(argc, argv, "hHa:c:d:f:l:m:o:P:p:r:s:t:", &l) ;
     if (opt == -1) break ;
     switch (opt)
     {
@@ -105,6 +105,11 @@ int main (int argc, char const *const *argv)
         doit(RLIMIT_NPROC, l.arg) ;
 #endif
         break ;
+      case 'P' :
+#ifdef RLIMIT_RTPRIO
+        doit(RLIMIT_RTPRIO, l.arg) ;
+#endif
+        break ;
       case 'r' :
 #ifdef RLIMIT_RSS
         doit(RLIMIT_RSS, l.arg) ;