Usermode portion of the support for swap allocation accounting:

- update for getrlimit(2) manpage;
- support for setting RLIMIT_SWAP in login class;
- addition to the limits(1) and sh and csh limit-setting builtins;
- tuning(7) documentation on the sysctls controlling overcommit.

In collaboration with:	pho
Reviewed by:	alc
Approved by:	re (kensmith)

2 files changed, 10 insertions, 0 deletions

diff --git a/lib/libc/sys/getrlimit.2 b/lib/libc/sys/getrlimit.2
index d3550d2..48feea0 100644
--- a/lib/libc/sys/getrlimit.2
+++ b/lib/libc/sys/getrlimit.2
@@ -97,6 +97,15 @@ mbufs, that this user may hold at any time.
 The maximum size (in bytes) of the stack segment for a process;
 this defines how far a program's stack segment may be extended.
 Stack extension is performed automatically by the system.
+.It Dv RLIMIT_SWAP
+The maximum size (in bytes) of the swap space that may be reserved or
+used by all of this user id's processes.
+This limit is enforced only if bit 1 of the
+.Va vm.overcommit
+sysctl is set.
+Please see
+.Xr tuning 7
+for a complete description of this sysctl.
 .It Dv RLIMIT_NPTS
 The maximum number of pseudo-terminals created by this user id.
 .El
diff --git a/lib/libutil/login_class.c b/lib/libutil/login_class.c
index 5074519..d54b301 100644
--- a/lib/libutil/login_class.c
+++ b/lib/libutil/login_class.c
@@ -64,6 +64,7 @@ static struct login_res {
     { "sbsize",          login_getcapsize, RLIMIT_SBSIZE  },
     { "vmemoryuse",      login_getcapsize, RLIMIT_VMEM    },
     { "pseudoterminals", login_getcapnum,  RLIMIT_NPTS    },
+    { "swapuse",         login_getcapsize, RLIMIT_SWAP    },
     { NULL,              0,                0              }
 };