Ripped from Fedora

Add support for RLIMIT_NICE/RLIMIT_RTPRIO and add missing documentation
for many other options

--- builtins/ulimit.def
+++ builtins/ulimit.def
@@ -24,7 +24,7 @@
 $BUILTIN ulimit
 $FUNCTION ulimit_builtin
 $DEPENDS_ON !_MINIX
-$SHORT_DOC ulimit [-SHacdfilmnpqstuvx] [limit]
+$SHORT_DOC ulimit [-SHacdefilmnpqrstuvx] [limit]
 Ulimit provides control over the resources available to processes
 started by the shell, on systems that allow such control.  If an
 option is given, it is interpreted as follows:
@@ -34,18 +34,20 @@
     -a	all current limits are reported
     -c	the maximum size of core files created
     -d	the maximum size of a process's data segment
+    -e	the maximum scheduling priority (`nice')
     -f	the maximum size of files created by the shell
-    -i  the maximum number of pending signals
+    -i	the maximum number of pending signals
     -l	the maximum size a process may lock into memory
     -m	the maximum resident set size
     -n	the maximum number of open file descriptors
     -p	the pipe buffer size
-    -q  the maximum number of bytes in POSIX message queues
+    -q	the maximum number of bytes in POSIX message queues
+    -r	the maximum rt priority
     -s	the maximum stack size
     -t	the maximum amount of cpu time in seconds
     -u	the maximum number of user processes
     -v	the size of virtual memory
-    -x  the maximum number of file locks
+    -x	the maximum number of file locks
 
 If LIMIT is given, it is the new value of the specified resource;
 the special LIMIT values `soft', `hard', and `unlimited' stand for
@@ -202,6 +204,9 @@
 #ifdef RLIMIT_DATA
   { 'd',	RLIMIT_DATA,  1024,	"data seg size",	"kbytes" },
 #endif
+#ifdef RLIMIT_NICE
+  { 'e',	RLIMIT_NICE,  1,	"max nice",	(char *)NULL},
+#endif
   { 'f',	RLIMIT_FILESIZE, 1024,	"file size",		"blocks" },
 #ifdef RLIMIT_SIGPENDING
   { 'i',	RLIMIT_SIGPENDING, 1,	"pending signals",	(char *)NULL },
@@ -217,6 +222,9 @@
 #ifdef RLIMIT_MSGQUEUE
   { 'q',	RLIMIT_MSGQUEUE, 1,	"POSIX message queues",	"bytes" },
 #endif
+#ifdef RLIMIT_RTPRIO
+  { 'r',	RLIMIT_RTPRIO, 1,	"max rt priority",	(char *)NULL},
+#endif
 #ifdef RLIMIT_STACK
   { 's',	RLIMIT_STACK, 1024,	"stack size",		"kbytes" },
 #endif
--- doc/bashref.texi
+++ doc/bashref.texi
@@ -3833,7 +3833,7 @@
 @item ulimit
 @btindex ulimit
 @example
-ulimit [-acdfilmnpqstuvxSH] [@var{limit}]
+ulimit [-acdefilmnpqrstuvxSH] [@var{limit}]
 @end example
 @code{ulimit} provides control over the resources available to processes
 started by the shell, on systems that allow such control.  If an
@@ -3854,6 +3854,9 @@
 @item -d
 The maximum size of a process's data segment.
 
+@item -e
+The maximum scheduling priority.
+
 @item -f
 The maximum size of files created by the shell.
 
@@ -3875,6 +3878,9 @@
 @item -q
 The maximum number of bytes in POSIX message queues.
 
+@item -r
+The maximum RT priority.
+
 @item -s
 The maximum stack size.
 
--- doc/bash.1
+++ doc/bash.1
@@ -8490,7 +8490,7 @@
 returns true if any of the arguments are found, false if
 none are found.
 .TP
-\fBulimit\fP [\fB\-SHacdfilmnpqstuvx\fP [\fIlimit\fP]]
+\fBulimit\fP [\fB\-SHacdefilmnpqrstuvx\fP [\fIlimit\fP]]
 Provides control over the resources available to the shell and to
 processes started by it, on systems that allow such control.
 The \fB\-H\fP and \fB\-S\fP options specify that the hard or soft limit is
@@ -8526,6 +8526,9 @@
 .B \-d
 The maximum size of a process's data segment
 .TP
+.B \-e
+The maximum scheduling priority (`nice')
+.TP
 .B \-f
 The maximum size of files created by the shell
 .TP
@@ -8548,6 +8551,9 @@
 .B \-q
 The maximum number of bytes in POSIX message queues
 .TP
+.B \-r
+The maximum rt priority
+.TP
 .B \-s
 The maximum stack size
 .TP