shells: a fix for systems without RLIMIT_NICE

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

1 files changed, 16 insertions, 3 deletions

diff --git a/shell/shell_common.c b/shell/shell_common.c
index dcbe0d109..f95a35e8b 100644
--- a/shell/shell_common.c
+++ b/shell/shell_common.c
@@ -324,12 +324,18 @@ struct limits {
         uint8_t factor_shift;   /* shift by to get rlim_{cur,max} values */
 };
 
+/* Order of entries matches order in which bash prints "ulimit -a" */
 static const struct limits limits_tbl[] ALIGN2 = {
         { RLIMIT_CORE,          9,      }, // -c
         { RLIMIT_DATA,          10,     }, // -d
+#ifdef RLIMIT_NICE
         { RLIMIT_NICE,          0,      }, // -e
-        { RLIMIT_FSIZE,         9,      }, // -f
 #define LIMIT_F_IDX     3
+#else
+/* for example, Hurd */
+#define LIMIT_F_IDX     2
+#endif
+        { RLIMIT_FSIZE,         9,      }, // -f
 #ifdef RLIMIT_SIGPENDING
         { RLIMIT_SIGPENDING,    0,      }, // -i
 #endif
@@ -364,13 +370,16 @@ static const struct limits limits_tbl[] ALIGN2 = {
         { RLIMIT_LOCKS,         0,      }, // -x
 #endif
 };
-// bash also shows:
+// 1) bash also shows:
 //pipe size            (512 bytes, -p) 8
+// 2) RLIMIT_RTTIME ("timeout for RT tasks in us") is not in the table
 
 static const char limits_help[] ALIGN1 =
         "core file size (blocks)"          // -c
         "\0""data seg size (kb)"           // -d
+#ifdef RLIMIT_NICE
         "\0""scheduling priority"          // -e
+#endif
         "\0""file size (blocks)"           // -f
 #ifdef RLIMIT_SIGPENDING
         "\0""pending signals"              // -i
@@ -410,7 +419,9 @@ static const char limits_help[] ALIGN1 =
 static const char limit_chars[] ALIGN1 =
                         "c"
                         "d"
+#ifdef RLIMIT_NICE
                         "e"
+#endif
                         "f"
 #ifdef RLIMIT_SIGPENDING
                         "i"
@@ -451,7 +462,9 @@ static const char limit_chars[] ALIGN1 =
 static const char ulimit_opt_string[] ALIGN1 = "-HSa"
                         "c::"
                         "d::"
+#ifdef RLIMIT_NICE
                         "e::"
+#endif
                         "f::"
 #ifdef RLIMIT_SIGPENDING
                         "i::"
@@ -668,7 +681,7 @@ shell_builtin_ulimit(char **argv)
 
         if (opt_cnt == 0) {
                 /* "bare ulimit": treat it as if it was -f */
-                getrlimit(limits_tbl[LIMIT_F_IDX].cmd, &limit);
+                getrlimit(RLIMIT_FSIZE, &limit);
                 printlim(opts, &limit, &limits_tbl[LIMIT_F_IDX]);
         }