Only in usr.bin/limits: limits
diff -ru usr.bin/limits.orig/limits.1 usr.bin/limits/limits.1
--- usr.bin/limits.orig/limits.1	2004-04-22 14:08:07.000000000 -0300
+++ usr.bin/limits/limits.1	2004-09-12 18:04:38.000000000 -0300
@@ -218,6 +218,10 @@
 command.  The total number of simultaneously open files in the entire
 system is limited to the value displayed by the 'sysctl kern.maxfiles'
 command.
+.It Fl r Op Ar limit
+Select or set the
+.Em forkdepth
+resource limit.
 .It Fl s Op Ar limit
 Select or set the
 .Em stacksize
Only in usr.bin/limits: limits.1.gz
diff -ru usr.bin/limits.orig/limits.c usr.bin/limits/limits.c
--- usr.bin/limits.orig/limits.c	2004-04-22 14:08:07.000000000 -0300
+++ usr.bin/limits/limits.c	2004-09-12 18:12:02.000000000 -0300
@@ -89,6 +89,7 @@
 #ifdef RLIMIT_POSIXLOCKS
 	  { "  posixlocks%-4s   %8s", "\n",	  1    },
 #endif
+	  { "  forkdepth%-4s    %8s", "\n",       1    },
       }
     },
     { "sh", "unlimited", "", " -H", " -S", "",
@@ -107,6 +108,7 @@
 #ifdef RLIMIT_POSIXLOCKS
 	  { "ulimit%s -k %s", ";\n",  1    },
 #endif
+	  { "ulimit%s -r %s", ";\n",  1    },
       }
     },
     { "csh", "unlimited", "", " -h", "", NULL,
@@ -125,6 +127,7 @@
 #ifdef RLIMIT_POSIXLOCKS
 	  { "limit%s advlocks %s",     ";\n",  1    },
 #endif
+	  { "limit%s forkdepth %s",    ";\n",  1    },
       }
     },
     { "bash|bash2", "unlimited", "", " -H", " -S", "",
@@ -143,6 +146,7 @@
 #ifdef RLIMIT_POSIXLOCKS
 	  { "ulimit%s -k %s", ";\n",  1    },
 #endif
+	  { "ulimit%s -r %s", ";\n",  1    },
       }
     },
     { "tcsh", "unlimited", "", " -h", "", NULL,
@@ -161,6 +165,7 @@
 #ifdef RLIMIT_POSIXLOCKS
 	  { "limit%s advlocks %s",      ";\n",  1   },
 #endif
+	  { "limit%s forkdepth %s",    ";\n",  1    },
       }
     },
     { "ksh|pdksh", "unlimited", "", " -H", " -S", "",
@@ -179,6 +184,7 @@
 #ifdef RLIMIT_POSIXLOCKS
 	  { "ulimit%s -k %s", ";\n",  1    },
 #endif
+	  { "ulimit%s -r %s", ";\n",  1    },
       }
     },
     { "zsh", "unlimited", "", " -H", " -S", "",
@@ -197,6 +203,7 @@
 #ifdef RLIMIT_POSIXLOCKS
 	  { "ulimit%s -k %s", ";\n",  1    },
 #endif
+	  { "ulimit%s -r %s", ";\n",  1    },
       }
     },
     { "rc|es", "unlimited", "", " -h", "", NULL,
@@ -215,6 +222,7 @@
 #ifdef RLIMIT_POSIXLOCKS
 	  { "limit%s advlocks %s",     ";\n",  1    },
 #endif
+	  { "limit%s forkdepth %s",    ";\n",  1    },
       }
     },
     { NULL }
@@ -236,6 +244,7 @@
     { "sbsize",		login_getcapsize },
     { "vmemoryuse",	login_getcapsize },
     { "posixlocks",	login_getcapnum  },
+    { "forkdepth",	login_getcapnum  },
 };
 
 /*
@@ -246,7 +255,7 @@
  * to be modified accordingly!
  */
 
-#define RCS_STRING  "tfdscmlunbvk"
+#define RCS_STRING  "tfdscmlunbvkr"
 
 static rlim_t resource_num(int which, int ch, const char *str);
 static void usage(void);
@@ -285,7 +294,7 @@
     }
 
     optarg = NULL;
-    while ((ch = getopt(argc, argv, ":EeC:U:BSHabc:d:f:k:l:m:n:s:t:u:v:")) != -1) {
+    while ((ch = getopt(argc, argv, ":EeC:U:BSHabc:d:f:k:l:m:n:r:s:t:u:v:")) != -1) {
 	switch(ch) {
 	case 'a':
 	    doall = 1;
@@ -503,7 +512,7 @@
 usage(void)
 {
     (void)fprintf(stderr,
-"usage: limits [-C class|-U user] [-eaSHBE] [-bcdflmnstuvk [val]] [[name=val ...] cmd]\n");
+"usage: limits [-C class|-U user] [-eaSHBE] [-bcdflmnstuvkr [val]] [[name=val ...] cmd]\n");
     exit(EXIT_FAILURE);
 }
 
@@ -608,6 +617,7 @@
 	    break;
 	case RLIMIT_NPROC:
 	case RLIMIT_NOFILE:
+	case RLIMIT_FORK:
 	    res = strtoq(s, &e, 0);
 	    s = e;
 	    break;
Only in usr.bin/limits: limits.o