limits(1): set and display process resources.

3 files changed, 954 insertions, 0 deletions

diff --git a/usr.bin/limits/Makefile b/usr.bin/limits/Makefile
new file mode 100644
index 0000000..885930f
--- /dev/null
+++ b/usr.bin/limits/Makefile
@@ -0,0 +1,13 @@
+#	@(#)Makefile	8.1 (Berkeley) 7/19/93
+
+PROG=	limits
+SRCS=	limits.c
+
+CFLAGS+=-Wall
+LDADD+= -lutil
+DPADD+= ${LIBUTIL}
+
+BINOWN=	root
+BINMODE=0555
+
+.include <bsd.prog.mk>
diff --git a/usr.bin/limits/limits.1 b/usr.bin/limits/limits.1
new file mode 100644
index 0000000..ebcc7b5
--- /dev/null
+++ b/usr.bin/limits/limits.1
@@ -0,0 +1,304 @@
+.\" Copyright (c) 1996 David Nugent <davidn@blaze.net.au>
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, is permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice immediately at the beginning of the file, without modification,
+.\"    this list of conditions, and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 3. This work was done expressly for inclusion into FreeBSD.  Other use
+.\"    is permitted provided this notation is included.
+.\" 4. Absolutely no warranty of function or purpose is made by the author
+.\"    David Nugent.
+.\" 5. Modifications may be freely made to this file providing the above
+.\"    conditions are met.
+.\"
+.\"	$FreeBSD$
+.\"
+.Dd January 15, 1996
+.Dt LIMITS 1
+.Os FreeBSD
+.Sh NAME
+.Nm limits
+.Nd Set or display process resource limits
+.Sh SYNOPSIS
+.Nm limits
+.Op Fl C Ar class | Fl U Ar user
+.Op Fl SHB
+.Op Fl e
+.Op Fl cdflmnstu Op val
+.Nm limits
+.Op Fl C Ar class | Fl U Ar user
+.Op Fl SHB
+.Op Fl cdflmnstu Op val
+.Op Fl E
+.Op Ar name=value ...
+.Op Ar command
+.Sh DESCRIPTION
+.Nm Limits
+ether prints or sets kernel resource limits, and may optionally set
+environment variables like
+.Xr env 1
+and run a program with the selected resources.
+Three uses of the
+.Nm limits
+command are possible:
+.Pp
+.Bl -hang -width indent
+.It Nm limits Op Ar limitflags
+.Op Ar name=value
+.Ar command
+.Pp
+This usage sets limits according to
+.Ar limitflags ,
+optionally sets environment variables given as
+.Ar name=value
+pairs, and then runs the specified command.
+.It Nm limits Op Ar limitflags
+.Pp
+This usage determines values of resource settings according to
+.Ar limitflags ,
+does not attempt to set them and outputs these values to
+standard output.
+By default, this will output the current kernel resource settings
+active for the calling process.
+Using the
+.Fl C Ar class
+or
+.Fl U Ar user
+flags, you may also display the current resource settings modified
+by the the appropriate login class resource limit entries from
+the
+.Xr login.conf 5
+login capabilities database.
+.It Nm limits Fl e Op Ar limitflags
+.Pp
+This usage determines values of resource settings according to
+.Ar limitflags ,
+but does not set them itself.
+Like the previous usage it outputs these values to standard
+output, except that it will emit them in
+.Em eval
+format, suitable for the calling shell.
+The calling shell is determined by examining the entries in the
+.Pa /proc
+filesystem for the parent process.
+If the shell is known (ie. it is one of sh, csh, bash, tcsh, ksh,
+pdksh or rc),
+.Nm limits
+emits 'limit' or 'ulimit' commands in the format understood by
+that shell.
+If the name of the shell cannot be determined, then the 'ulimit'
+format used by
+.Pa /bin/sh
+is used.
+.Pp
+This is very useful for setting limits used by scripts, or prior
+launching of daemons and other background tasks with specific
+resource limit settings, and provides the benefit of allowing
+global configuration of maximum resource usage by maintaining a
+central database of settings in the login class database.
+.Pp
+Within a shell script,
+.Nm limits
+will normally be used with eval within backticks as follows:
+.Pp
+.Dl eval `limits -e -C daemon`
+.Pp
+which causes the output of
+.Nm limits
+to be evaluated and set by the current shell.
+.El
+.Pp
+The value of limitflags specified in the above contains one or more of the
+following options:
+.Pp
+.Bl -tag -width "-d [limit]"
+.It Fl C Ar class
+Use current resource values, modified by the resource entries applicable
+for the login class "class".
+.It Fl U Ar user
+Use current resource values, modified by the resource entries applicable
+to the login class which "user" belongs to.
+If the user does not belong to a class, then the resource capabilities
+for the "default" class are used, if it exists, or the "root" class if
+the user is a superuser account.
+.It Fl S
+Selects display or setting of "soft" (or current) resource limits.
+If specific limits settings follow this switch, only soft limits are
+affected unless overridden later with either the
+.Fl H
+or
+.Fl B
+flags.
+.It Fl H
+Selects display or setting of "hard" (or maximum) resource limits.
+If specific limits settings follow this switch, only hard limits are
+affected until overridden later with either the
+.Fl S
+or
+.Fl B
+flags.
+.It Fl B
+Selects display or setting of both "soft" (current) or "hard" (maximum)
+resource limits.
+If specific limits settings follow this switch, both soft and hard
+limits are affected until overridden later with either the
+.Fl S
+or 
+.Fl H
+flags.
+.Fl e
+Selects "eval mode" formatting for output.
+This is valid only on display mode and cannot be used when running a
+command.
+The exact syntax used for output depeneds upon the type of shell from
+which
+.Nm limits
+is invoked.
+.It Fl c Op Ar limit
+Selects or sets (if 'limit' is specified) the
+.Em coredumsize
+resource limit.
+A value of 0 disables core dumps.
+.It Fl d Op Ar limit
+Selects or sets (if 'limit' is specified) the
+.Em datasize
+resource limit.
+.It Fl f Op Ar limit
+Selects or sets the
+.Em filesize
+resource limit.
+.It Fl l Op Ar limit
+Selects or sets the
+.Em memorylocked
+resource limit.
+.It Fl m Op Ar limit
+Selects or sets the
+.Em memoryuse
+size limit
+.It Fl n Op Ar limit
+Selects or sets the
+.Em openfiles
+resource limit.
+.It Fl s Op Ar limit
+Selects or sets the
+.Em stacksize
+resource limit.
+.It Fl t Op Ar limit
+Selects or sets the
+.Em cputime
+resource limit.
+.It Fl u Op Ar limit
+Selects or sets the
+.Em maxproc
+resource limit.
+.Pp
+Valid values for 'limit' in the above set of flags consist of either the
+string 'infinity' or 'inf' for an infinite (or kernel-defined maximum)
+limit, or a numeric value maybe followed by a suffix.
+Values which relate to size default to a value in bytes, or one of the
+following suffixes may be used as a multiplier:
+.Pp
+.Bl -tag -offset indent -width "xxxx" -compact
+.It b
+512 byte blocks.
+.It k
+kilobytes (1024 bytes).
+.It m
+megabytes (1024*1024 bytes).
+.It g
+gigabytes.
+.It t
+terrabytes.
+.El
+.Pp
+The
+.Em cputime
+resource defaults to a number of seconds, but a multiplier may be
+used, and as with size values, multiple values separated by a valid
+suffix are added together:
+.Bl -tag -offset indent -width "xxxx" -compact
+.It s
+seconds.
+.It m
+minutes.
+.It h
+hours.
+.It d
+days.
+.It w
+weeks.
+.It y
+365 day years.
+.El
+.Pp
+.It Fl E
+The option
+.Sq Fl E
+causes
+.Nm limits
+to completely ignore the environment it inherits.
+.It Fl a
+This option forces all resource settings to be displayed even if
+other specific resource settings have been specified.
+For example, if you wish to disable core dumps when starting up
+the usenet news system, but wish to set all other resource settings
+as well that apply to the 'news' account, you might use:
+.Pp
+.Dl eval `limits -U news -aBec 0`
+.Pp
+As with the 
+.Xr setrlimit 3
+call, only the superuser may raise process "hard" resource limits.
+Non-root users may, however, lower them or change "soft" resource limits
+within to any value below the hard limit.
+When invoked to execute a program, the failure of
+.Nm limits
+to raise a hard limit is considered a fatal error.
+.El
+.Sh DIAGNOSTICS
+.Nm Limits
+exits with EXIT_FAILURE if usage is incorrect in any way; ie. an invalid
+option, or set/display options are selected in the same invocation,
+.Fl e
+is used when running a program, etc.
+When run in display or eval mode,
+.Nm limits
+exits with with a status of EXIT_SUCCESS.
+When run in command mode and execution of the command succeeds, the exit status
+will be whatever the executed program returns.
+.Sh SEE ALSO
+.Xr csh 1 ,
+.Xr env 1 ,
+.Xr limit 1 ,
+.Xr sh 1 ,
+.Xr ulimit 1 ,
+.Xr getrlimit 3 ,
+.Xr setrlimit 3 ,
+.Xr login_cap 3 ,
+.Xr login.conf 5
+.Sh BUGS
+.Nm Limits
+does not handle commands with equal (``='') signs in their
+names, for obvious reasons.
+.Pp
+When eval output is selected, the /proc filesystem must be installed
+and mounted for the shell to be correctly determined, and therefore
+output syntax correct for the running shell.
+The default output is valid for /bin/sh, so this means that any
+usage of
+.Nm limits
+in eval mode prior mounting /proc may only occur in standard bourne
+shell scripts.
+.Pp
+.Nm Limits
+makes no effort to ensure that resource settings emitted or displayed
+are valid and settable by the current user.
+Only a superuser account may raise hard limits, and and when doing so
+the FreeBSD kernel will silently lower limits to values less than
+specified if the values given are too high.
diff --git a/usr.bin/limits/limits.c b/usr.bin/limits/limits.c
new file mode 100644
index 0000000..302da3a
--- /dev/null
+++ b/usr.bin/limits/limits.c
@@ -0,0 +1,637 @@
+/*-
+ * Copyright (c) 1997 by
+ * David L. Nugent <davidn@blaze.net.au>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, is permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice immediately at the beginning of the file, without modification,
+ *    this list of conditions, and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. This work was done expressly for inclusion into FreeBSD.  Other use
+ *    is permitted provided this notation is included.
+ * 4. Absolutely no warranty of function or purpose is made by the authors.
+ * 5. Modifications may be freely made to this file providing the above
+ *    conditions are met.
+ *
+ * Display/change(+runprogram)/eval resource limits.
+ *
+ *	$FreeBSD$
+ */
+
+#include <err.h>
+#include <stdio.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/param.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <stdarg.h>
+#include <ctype.h>
+#include <errno.h>
+#include <pwd.h>
+#include <login_cap.h>
+#include <sys/time.h>
+#include <sys/resource.h>
+
+enum
+{
+  SH_NONE,
+  SH_SH,      /* sh */
+  SH_CSH,     /* csh */
+  SH_BASH,    /* gnu bash */
+  SH_TCSH,    /* tcsh */
+  SH_KSH,     /* (pd)ksh */
+  SH_ZSH,     /* zsh */
+  SH_RC,      /* rc or es */
+  SH_NUMBER
+};
+
+
+/* eval emitter for popular shells.
+ * Why aren't there any standards here? Most shells support either
+ * the csh 'limit' or sh 'ulimit' command, but each varies just
+ * enough that they aren't very compatible from one to the other.
+ */
+static struct {
+  const char * name;	    /* Name of shell */
+  const char * inf;	    /* Name used for 'unlimited' resource */
+  const char * cmd;	    /* Intro text */
+  const char * hard;	    /* Hard limit text */
+  const char * soft;	    /* Soft limit text */
+  const char * both;	    /* Hard+Soft limit text */
+  struct {
+    const char * pfx;
+    const char * sfx;
+    int divisor;
+  } lprm[RLIM_NLIMITS];
+} shellparm[] =
+{
+  { "", "infinity", "Resource limits%s%s:\n", "-max", "-cur", "",
+    {
+	    { "  cputime%-4s      %8s", " secs\n",  1    },
+	    { "  filesize%-4s     %8s", " kb\n",    1024 },
+	    { "  datasize%-4s     %8s", " kb\n",    1024 },
+	    { "  stacksize%-4s    %8s", " kb\n",    1024 },
+	    { "  coredumpsize%-4s %8s", " kb\n",    1024 },
+	    { "  memoryuse%-4s    %8s", " kb\n",    1024 },
+	    { "  memorylocked%-4s %8s", " kb\n",    1024 },
+	    { "  maxprocesses%-4s %8s", "\n",       1    },
+	    { "  openfiles%-4s    %8s", "\n",       1    }
+    }
+  },
+  { "sh", "unlimited", "", " -H", " -S", "",
+    {
+	    { "ulimit%s -t %s", ";\n",  1    },
+	    { "ulimit%s -f %s", ";\n",  512  },
+	    { "ulimit%s -d %s", ";\n",  1024 },
+	    { "ulimit%s -s %s", ";\n",  1024 },
+	    { "ulimit%s -c %s", ";\n",  512  },
+	    { "ulimit%s -m %s", ";\n",  1024 },
+	    { "ulimit%s -l %s", ";\n",  1024 },
+	    { "ulimit%s -u %s", ";\n",  1    },
+	    { "ulimit%s -n %s", ";\n",  1    }
+    }
+  },
+  { "csh", "unlimited", "", " -h", "", NULL,
+    {
+	    { "limit%s cputime %s",      ";\n",  1    },
+	    { "limit%s filesize %s",     ";\n",  1024 },
+	    { "limit%s datasize %s",     ";\n",  1024 },
+	    { "limit%s stacksize %s",    ";\n",  1024 },
+	    { "limit%s coredumpsize %s", ";\n",  1024 },
+	    { "limit%s memoryuse %s",    ";\n",  1024 },
+	    { "limit%s memorylocked %s", ";\n",  1024 },
+	    { "limit%s maxproc %s",      ";\n",  1    },
+	    { "limit%s openfiles %s",    ";\n",  1    }
+    }
+  },
+  { "bash", "unlimited", "", " -H", " -S", "",
+    {
+	    { "ulimit%s -t %s", ";\n",  1    },
+	    { "ulimit%s -f %s", ";\n",  1024 },
+	    { "ulimit%s -d %s", ";\n",  1024 },
+	    { "ulimit%s -s %s", ";\n",  1024 },
+	    { "ulimit%s -c %s", ";\n",  1024 },
+	    { "ulimit%s -v %s", ";\n",  1024 },
+	    { "ulimit%s -m %s", ";\n",  1024 },
+	    { "ulimit%s -u %s", ";\n",  1    },
+	    { "ulimit%s -n %s", ";\n",  1    }
+    }
+  },
+  { "tcsh", "unlimited", "", " -h", "", NULL,
+    {
+	    { "limit%s cputime %s",      ";\n",  1    },
+	    { "limit%s filesize %s",     ";\n",  1024 },
+	    { "limit%s datasize %s",     ";\n",  1024 },
+	    { "limit%s stacksize %s",    ";\n",  1024 },
+	    { "limit%s coredumpsize %s", ";\n",  1024 },
+	    { "limit%s memoryuse %s",    ";\n",  1024 },
+	    { "limit%s memorylocked %s", ";\n",  1024 },
+	    { "limit%s maxproc %s",      ";\n",  1    },
+	    { "limit%s descriptors %s",  ";\n",  1    }
+    }
+  },
+  { "ksh|pdksh", "unlimited", "", " -H", " -S", "",
+    {
+	    { "ulimit%s -t %s", ";\n",  1    },
+	    { "ulimit%s -f %s", ";\n",  512  },
+	    { "ulimit%s -d %s", ";\n",  1024 },
+	    { "ulimit%s -s %s", ";\n",  1024 },
+	    { "ulimit%s -c %s", ";\n",  512  },
+	    { "ulimit%s -m %s", ";\n",  1024 },
+	    { "ulimit%s -l %s", ";\n",  1024 },
+	    { "ulimit%s -p %s", ";\n",  1    },
+	    { "ulimit%s -n %s", ";\n",  1    }
+    }
+  },
+  { "zsh", "unlimited", "", " -H", " -S", "",
+    {
+	    { "ulimit%s -t %s", ";\n",  1    },
+	    { "ulimit%s -f %s", ";\n",  512  },
+	    { "ulimit%s -d %s", ";\n",  1024 },
+	    { "ulimit%s -s %s", ";\n",  1024 },
+	    { "ulimit%s -c %s", ";\n",  512  },
+	    { "ulimit%s -m %s", ";\n",  1024 },
+	    { "ulimit%s -l %s", ";\n",  1024 },
+	    { "ulimit%s -u %s", ";\n",  1    },
+	    { "ulimit%s -n %s", ";\n",  1    }
+    }
+  },
+    /* Note: I recommend you don't use rc/es with 'limits'
+     * as this seems to be fairly buggy.  The values below
+     * are set according to the manpage, but, for example,
+     * the string 'unlimited' is  not actually accepted by
+     * the shell.  'es' is also prone to core dumping when
+     * displaying or modifying limits. Hopefully this will
+     * be fixed.               DLN - Wed Jan 15 20:30 1997
+     */
+  { "rc|es", "unlimited", "", " -h", "", NULL,
+    {
+	    { "limit%s cputime %s",      ";\n",  1    },
+	    { "limit%s filesize %s",     ";\n",  1024 },
+	    { "limit%s datasize %s",     ";\n",  1024 },
+	    { "limit%s stacksize %s",    ";\n",  1024 },
+	    { "limit%s coredumpsize %s", ";\n",  1024 },
+	    { "limit%s memoryuse %s",    ";\n",  1024 },
+	    { "limit%s lockedmemory %s", ";\n",  1024 },
+	    { "limit%s processes %s",    ";\n",  1    },
+	    { "limit%s descriptors %s",  ";\n",  1    }
+    }
+  },
+  { NULL }
+};
+
+static struct {
+  const char * cap;
+  rlim_t (*func)(login_cap_t *, const char *, rlim_t, rlim_t);
+} resources[RLIM_NLIMITS] = {
+  { "cputime",	    login_getcaptime },
+  { "filesize",     login_getcapsize },
+  { "datasize",     login_getcapsize },
+  { "stacksize",    login_getcapsize },
+  { "coredumpsize", login_getcapsize },
+  { "memoryuse",    login_getcapsize },
+  { "memorylocked", login_getcapsize },
+  { "maxproc",	    login_getcapnum, },
+  { "openfiles",    login_getcapnum  }
+};
+
+/*
+ * One letter for each resource levels.
+ * NOTE: There is a dependancy on the corresponding
+ * letter index being equal to the resource number.
+ * If sys/resource.h defines are changed, this needs
+ * to be modified accordingly!
+ */
+
+#define RCS_STRING  "tfdscmlun"
+
+static rlim_t resource_num(int which, int ch, const char *str);
+static void usage(const char *msg, ...);
+static int getshelltype(void);
+static void print_limit(rlim_t limit, unsigned divisor, const char * inf, const char * pfx, const char * sfx, const char * which);
+extern char **environ;
+
+static const char rcs_string[] = RCS_STRING;
+
+int
+main(int argc, char *argv[])
+{
+  char *p, *cls = NULL;
+  char *cleanenv[1];
+  struct passwd * pwd = NULL;
+  int rcswhich, shelltype;
+  int i, num_limits = 0;
+  int ch, doeval = 0, doall = 0;
+  login_cap_t * lc = NULL;
+  enum { ANY=0, SOFT=1, HARD=2, BOTH=3, DISPLAYONLY=4 } type = ANY;
+  enum { RCSUNKNOWN=0, RCSSET=1, RCSSEL=2 } todo = RCSUNKNOWN;
+  int which_limits[RLIM_NLIMITS];
+  rlim_t set_limits[RLIM_NLIMITS];
+  struct rlimit limits[RLIM_NLIMITS];
+
+  /* init resource tables */
+  for (i = 0; i < RLIM_NLIMITS; i++)
+  {
+    which_limits[i] = 0; /* Don't set/display any */
+    set_limits[i] = RLIM_INFINITY;
+    /* Get current resource values */
+    getrlimit(i, &limits[i]);
+  }
+
+  optarg = NULL;
+  while ((ch = getopt(argc, argv, ":EeC:U:BSHac:d:f:l:m:n:s:t:u:")) != EOF) {
+    switch(ch) {
+      case 'a':
+      	doall = 1;
+      	break;
+      case 'E':
+      	environ = cleanenv;
+      	cleanenv[0] = NULL;
+      	break;
+      case 'e':
+      	doeval = 1;
+      	break;
+      case 'C':
+      	cls = optarg;
+      	break;
+      case 'U':
+      	if ((pwd = getpwnam(optarg)) == NULL) {
+      	  if (!isdigit(*optarg) || (pwd = getpwuid(atoi(optarg))) == NULL) {
+      	    usage("Invalid user `%s'\n", optarg); 
+      	  }
+      	}
+      	break;
+      case 'H':
+      	type = HARD;
+      	break;
+      case 'S':
+      	type = SOFT;
+      	break;
+      case 'B':
+	type = SOFT|HARD;
+	break;
+      default:
+      case ':': /* Without arg */
+      	if ((p = strchr(rcs_string, optopt)) != NULL) {
+      	  int rcswhich = p - rcs_string;
+	  if (optarg && *optarg == '-') { /* 'arg' is actually a switch */
+	    --optind;		/* back one arg, and make arg NULL */
+	    optarg = NULL;
+	  }
+    	  todo = optarg == NULL ? RCSSEL : RCSSET;
+	  if (type == ANY)
+	    type = BOTH;
+      	  which_limits[rcswhich] = optarg ? type : DISPLAYONLY;
+      	  set_limits[rcswhich] = resource_num(rcswhich, optopt, optarg);
+      	  num_limits++;
+      	  break;
+      	}
+      	/* FALLTHRU */
+      case '?':
+      	usage(NULL);
+    }
+    optarg = NULL;
+  }
+
+  /* If user was specified, get class from that */
+  if (pwd != NULL)
+    lc = login_getclass(pwd);
+  else if (cls != NULL) {
+    lc = login_getclassbyname(cls, NULL);
+    if (lc == NULL || strcmp(cls, lc->lc_class) != 0)
+      fprintf(stderr, "login class '%s' non-existent, using %s\n", cls, lc?lc->lc_class:"current settings");
+  }
+
+  /* If we have a login class, update resource table from that */
+  if (lc != NULL) {
+    for (rcswhich = 0; rcswhich < RLIM_NLIMITS; rcswhich++) {
+      char str[40];
+      rlim_t val;
+
+      /* current value overridden by resourcename or resourcename-cur */
+      sprintf(str, "%s-cur", resources[rcswhich].cap);
+      val = resources[rcswhich].func(lc, resources[rcswhich].cap, limits[rcswhich].rlim_cur, limits[rcswhich].rlim_cur);
+      limits[rcswhich].rlim_cur = resources[rcswhich].func(lc, str, val, val);
+      /* maximum value overridden by resourcename or resourcename-max */
+      sprintf(str, "%s-max", resources[rcswhich].cap);
+      val = resources[rcswhich].func(lc, resources[rcswhich].cap, limits[rcswhich].rlim_max, limits[rcswhich].rlim_max);
+      limits[rcswhich].rlim_max = resources[rcswhich].func(lc, str, val, val);
+    }
+  }
+
+  /* now, let's determine what we wish to do with all this */
+
+  argv += optind;
+
+  /* If we're setting limits or doing an eval (ie. we're not just
+   * displaying), then check that hard limits are not lower than
+   * soft limits, and force rasing the hard limit if we need to if
+   * we are raising the soft limit, or lower the soft limit if we
+   * are lowering the hard limit.
+   */
+  if ((*argv || doeval) && getuid() == 0) {
+    for (rcswhich = 0; rcswhich < RLIM_NLIMITS; rcswhich++) {
+      if (limits[rcswhich].rlim_max != RLIM_INFINITY) {
+	if (limits[rcswhich].rlim_cur == RLIM_INFINITY) {
+	  limits[rcswhich].rlim_max = RLIM_INFINITY;
+	    which_limits[rcswhich] |= HARD;
+	} else if (limits[rcswhich].rlim_cur > limits[rcswhich].rlim_max) {
+	  if (which_limits[rcswhich] == SOFT) {
+	    limits[rcswhich].rlim_max = limits[rcswhich].rlim_cur;
+	    which_limits[rcswhich] |= HARD;
+	  }  else if (which_limits[rcswhich] == HARD) {
+	    limits[rcswhich].rlim_cur = limits[rcswhich].rlim_max;
+	    which_limits[rcswhich] |= SOFT;
+	  } else {
+	    /* else.. if we're specifically setting both to
+	     * silly values, then let it error out.
+	     */
+	  }
+	}
+      }
+    }
+  }
+
+  /* See if we've overridden anything specific on the command line */
+  if (num_limits && todo == RCSSET) {
+    for (rcswhich = 0; rcswhich < RLIM_NLIMITS; rcswhich++) {
+      if (which_limits[rcswhich] & HARD)
+	limits[rcswhich].rlim_max = set_limits[rcswhich];
+      if (which_limits[rcswhich] & SOFT)
+	limits[rcswhich].rlim_cur = set_limits[rcswhich];
+    }
+  }
+
+  /* If *argv is not NULL, then we are being asked to
+   * (perhaps) set environment variables and run a program
+   */
+  if (*argv) {
+    if (doeval)
+      usage("-e cannot be used with `cmd' option\n");
+
+    login_close(lc);
+
+    /* set leading environment variables, like eval(1) */
+    while (*argv && (p = strchr(*argv, '=')))
+      (void)setenv(*argv++, ++p, 1);
+
+    /* Set limits */
+    for (rcswhich = 0; rcswhich < RLIM_NLIMITS; rcswhich++) {
+      if (doall || num_limits == 0 || which_limits[rcswhich] != 0)
+	if (setrlimit(rcswhich, &limits[rcswhich]) == -1)
+	  err(1, "setrlimit %s", resources[rcswhich].cap);
+    }
+
+    if (*argv == NULL)
+      usage(NULL);
+
+    execvp(*argv, argv);
+    err(1, "%s", *argv);
+  }
+
+  shelltype = doeval ? getshelltype() : SH_NONE;
+
+  if (type == ANY) /* Default to soft limits */
+    type = SOFT;
+
+  /* Display limits */
+  printf(shellparm[shelltype].cmd, lc ? " for class " : " (current)", lc ? lc->lc_class : "");
+  for (rcswhich = 0; rcswhich < RLIM_NLIMITS; rcswhich++) {
+    if (doall || num_limits == 0 || which_limits[rcswhich] != 0) {
+      if (which_limits[rcswhich] == ANY || which_limits[rcswhich])
+	which_limits[rcswhich] = type;
+      if (shellparm[shelltype].lprm[rcswhich].pfx) {
+	if (shellparm[shelltype].both && limits[rcswhich].rlim_cur == limits[rcswhich].rlim_max) {
+	  print_limit(limits[rcswhich].rlim_max,
+		      shellparm[shelltype].lprm[rcswhich].divisor,
+		      shellparm[shelltype].inf,
+		      shellparm[shelltype].lprm[rcswhich].pfx,
+		      shellparm[shelltype].lprm[rcswhich].sfx,
+		      shellparm[shelltype].both);
+	} else {
+	  if (which_limits[rcswhich] & HARD) {
+	    print_limit(limits[rcswhich].rlim_max,
+		      shellparm[shelltype].lprm[rcswhich].divisor,
+		      shellparm[shelltype].inf,
+		      shellparm[shelltype].lprm[rcswhich].pfx,
+		      shellparm[shelltype].lprm[rcswhich].sfx,
+		      shellparm[shelltype].hard);
+	  }
+	  if (which_limits[rcswhich] & SOFT) {
+	    print_limit(limits[rcswhich].rlim_cur,
+		      shellparm[shelltype].lprm[rcswhich].divisor,
+		      shellparm[shelltype].inf,
+		      shellparm[shelltype].lprm[rcswhich].pfx,
+		      shellparm[shelltype].lprm[rcswhich].sfx,
+		      shellparm[shelltype].soft);
+	  }
+	}
+      }
+    }
+  }
+
+  login_close(lc);
+  exit(EXIT_SUCCESS);
+}
+
+
+static void
+usage(char const *msg, ...)
+{
+  if (msg) {
+    va_list argp;
+    va_start(argp, msg);
+    vfprintf(stderr, msg, argp);
+    va_end(argp);
+  }
+  (void)fprintf(stderr, "limits [-C class|-U user] [-eaSHBE] [-cdflmnstu [val]] [[name=val ...] cmd]\n");
+  exit(EXIT_FAILURE);
+}
+
+static void
+print_limit(rlim_t limit, unsigned divisor, const char * inf, const char * pfx, const char * sfx, const char * which)
+{
+  char numbr[64];
+  if (limit == RLIM_INFINITY)
+    strcpy(numbr, inf);
+  else
+#ifdef RLIM_LONG
+    sprintf(numbr, "%ql", (long)((limit + divisor/2) / divisor));
+#else
+    sprintf(numbr, "%qd", (quad_t)((limit + divisor/2) / divisor));
+#endif
+  printf(pfx, which, numbr);
+  printf(sfx, which);
+
+}
+
+
+#ifdef RLIM_LONG
+# define STRTOV strtol
+#else
+# define STRTOV strtoq
+#endif
+
+static rlim_t
+resource_num(int which, int ch, const char *str)
+{
+  rlim_t res = RLIM_INFINITY;
+
+  if (str != NULL && !(strcasecmp(str, "inf")==0 || strcasecmp(str, "infinity")==0 || strcasecmp(str, "unlimited")==0)) {
+    const char * s = str;
+    char *e;
+    switch (which)
+    {
+      case RLIMIT_CPU:	/* time values */
+      	errno = 0;
+      	res = 0;
+      	while (*s) {
+      	  rlim_t tim = STRTOV(s, &e, 0);
+      	  if (e == NULL || e == s || errno)
+      	    break;
+      	  switch (*e++) {
+      	    case 0:		   	/* end of string */
+      	      e--;
+      	    default:
+              case 's': case 'S':	/* seconds */
+      	      break;
+            case 'm': case 'M':	/* minutes */
+      	      tim *= 60L;
+      	      break;
+            case 'h': case 'H':	/* hours */
+      	      tim *= (60L * 60L);
+      	      break;
+            case 'd': case 'D':	/* days */
+      	      tim *= (60L * 60L * 24L);
+      	      break;
+            case 'w': case 'W':	/* weeks */
+      	      tim *= (60L * 60L * 24L * 7L);
+            case 'y': case 'Y':	/* Years */
+      	      tim *= (60L * 60L * 24L * 365L);
+	  }
+      	  s = e;
+      	  res += tim;
+      	}
+      	break;
+      case RLIMIT_FSIZE: /* Size values */
+      case RLIMIT_DATA:
+      case RLIMIT_STACK:
+      case RLIMIT_CORE:
+      case RLIMIT_RSS:
+      case RLIMIT_MEMLOCK:
+      	errno = 0;
+      	res = 0;
+      	while (*s) {
+      	  rlim_t mult, tim = STRTOV(s, &e, 0);
+      	  if (e == NULL || e == s || errno)
+      	    break;
+      	  switch (*e++) {
+            case 0:	/* end of string */
+      	      e--;
+      	    default:
+      	      mult = 1;
+      	      break;
+            case 'b': case 'B':	/* 512-byte blocks */
+      	      mult = 512;
+      	      break;
+            case 'k': case 'K':	/* 1024-byte Kilobytes */
+      	      mult = 1024;
+      	      break;
+            case 'm': case 'M':	/* 1024-k kbytes */
+      	      mult = 1024 * 1024;
+      	      break;
+            case 'g': case 'G':	/* 1Gbyte */
+      	      mult = 1024 * 1024 * 1024;
+      	      break;
+#ifndef RLIM_LONG
+      	    case 't': case 'T':	/* 1TBte */
+      	      mult = 1024LL * 1024LL * 1024LL * 1024LL;
+      	      break;
+#endif
+      	  }
+      	  s = e;
+      	  res += (tim * mult);
+      	}
+      	break;
+      case RLIMIT_NPROC:
+      case RLIMIT_NOFILE:
+      	res = STRTOV(s, &e, 0);
+      	s = e;
+      	break;
+    }
+    if (*s)
+      usage("invalid value -%c `%s'\n", ch, str);
+  }
+  return res;
+}
+
+
+static int
+getshellbyname(const char * shell)
+{
+  int i;
+  const char * q;
+  const char * p = strrchr(shell, '/');
+
+  p = p ? ++p : shell;
+  for (i = 0; (q = shellparm[i].name) != NULL; i++) {
+    while (*q)
+    {
+      int j = strcspn(q, "|");
+      if (j == 0)
+	break;
+      if (strncmp(p, q, j) == 0)
+	return i;
+      if (*(q += j))
+	++q;
+    }
+  }
+  return SH_SH;
+}
+
+/*
+ * Determine the type of shell our parent process is
+ * This is quite tricky, not 100% reliable and probably
+ * not nearly as thorough as it should be. Basically, this
+ * is a "best guess" only, but hopefully will work in
+ * most cases.
+ */
+
+static int
+getshelltype(void)
+{
+  pid_t ppid = getppid();
+
+  if (ppid != 1) {
+    FILE * fp;
+    struct stat st;
+    char procdir[MAXPATHLEN], buf[128];
+    int l = sprintf(procdir, "/proc/%ld/", (long)ppid);
+    char * shell = getenv("SHELL");
+
+    if (shell != NULL && stat(shell, &st) != -1)
+    {
+      struct stat st1;
+      strcpy(procdir+l, "file");
+      /* $SHELL is actual shell? */
+      if (stat(procdir, &st1) != -1 && memcmp(&st, &st1, sizeof st) == 0)
+	return getshellbyname(shell);
+    }
+    strcpy(procdir+l, "status");
+    if (stat(procdir, &st) == 0 && (fp = fopen(procdir, "r")) != NULL) {
+      char * p = fgets(buf, sizeof buf, fp)==NULL ? NULL : strtok(buf, " \t");
+      fclose(fp);
+      if (p != NULL)
+	return getshellbyname(p);
+    }
+  }
+  return SH_SH;
+}
+