diff options
Diffstat (limited to 'lib/libkvm/kvm_getswapinfo.c')
| -rw-r--r-- | lib/libkvm/kvm_getswapinfo.c | 188 |
1 files changed, 188 insertions, 0 deletions
diff --git a/lib/libkvm/kvm_getswapinfo.c b/lib/libkvm/kvm_getswapinfo.c new file mode 100644 index 0000000..9ba7a5c --- /dev/null +++ b/lib/libkvm/kvm_getswapinfo.c @@ -0,0 +1,188 @@ +/* + * Copyright (c) 1999, Matthew Dillon. All Rights Reserved. + * Copyright (c) 2001, Thomas Moestl. All Rights Reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, 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. + * + * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include <sys/param.h> +#include <sys/time.h> +#include <sys/stat.h> +#include <sys/blist.h> +#include <sys/sysctl.h> + +#include <vm/vm_param.h> + +#include <err.h> +#include <errno.h> +#include <fcntl.h> +#include <kvm.h> +#include <nlist.h> +#include <paths.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> +#include <limits.h> + +#include "kvm_private.h" + +#define NL_SWAPBLIST 0 +#define NL_SWDEVT 1 +#define NL_NSWDEV 2 +#define NL_DMMAX 3 + +static int kvm_swap_nl_cached = 0; +static int unswdev; /* number of found swap dev's */ +static int dmmax; + +static int kvm_getswapinfo_sysctl(kvm_t *, struct kvm_swap *, int, int); +static int getsysctl(kvm_t *, char *, void *, size_t); + +#define GETSWDEVNAME(dev, str, flags) \ + if (dev == NODEV) { \ + strlcpy(str, "[NFS swap]", sizeof(str)); \ + } else { \ + snprintf( \ + str, sizeof(str),"%s%s", \ + ((flags & SWIF_DEV_PREFIX) ? _PATH_DEV : ""), \ + devname(dev, S_IFCHR) \ + ); \ + } + +int +kvm_getswapinfo( + kvm_t *kd, + struct kvm_swap *swap_ary, + int swap_max, + int flags +) { + + /* + * clear cache + */ + if (kd == NULL) { + kvm_swap_nl_cached = 0; + return(0); + } + + if (ISALIVE(kd)) { + return kvm_getswapinfo_sysctl(kd, swap_ary, swap_max, flags); + } else { + return -1; + } +} + +#define GETSYSCTL(kd, name, var) \ + getsysctl(kd, name, &(var), sizeof(var)) + +/* The maximum MIB length for vm.swap_info and an additional device number */ +#define SWI_MAXMIB 3 + +int +kvm_getswapinfo_sysctl( + kvm_t *kd, + struct kvm_swap *swap_ary, + int swap_max, + int flags +) { + int ti, ttl; + size_t mibi, len; + int soid[SWI_MAXMIB]; + struct xswdev xsd; + struct kvm_swap tot; + + if (!GETSYSCTL(kd, "vm.dmmax", dmmax)) + return -1; + + mibi = SWI_MAXMIB - 1; + if (sysctlnametomib("vm.swap_info", soid, &mibi) == -1) { + _kvm_err(kd, kd->program, "sysctlnametomib failed: %s", + strerror(errno)); + return -1; + } + bzero(&tot, sizeof(tot)); + for (unswdev = 0;; unswdev++) { + soid[mibi] = unswdev; + len = sizeof(xsd); + if (sysctl(soid, mibi + 1, &xsd, &len, NULL, 0) == -1) { + if (errno == ENOENT) + break; + _kvm_err(kd, kd->program, "cannot read sysctl: %s.", + strerror(errno)); + return -1; + } + if (len != sizeof(xsd)) { + _kvm_err(kd, kd->program, "struct xswdev has unexpected " + "size; kernel and libkvm out of sync?"); + return -1; + } + if (xsd.xsw_version != XSWDEV_VERSION) { + _kvm_err(kd, kd->program, "struct xswdev version " + "mismatch; kernel and libkvm out of sync?"); + return -1; + } + + ttl = xsd.xsw_nblks - dmmax; + if (unswdev < swap_max - 1) { + bzero(&swap_ary[unswdev], sizeof(swap_ary[unswdev])); + swap_ary[unswdev].ksw_total = ttl; + swap_ary[unswdev].ksw_used = xsd.xsw_used; + swap_ary[unswdev].ksw_flags = xsd.xsw_flags; + GETSWDEVNAME(xsd.xsw_dev, swap_ary[unswdev].ksw_devname, + flags); + } + tot.ksw_total += ttl; + tot.ksw_used += xsd.xsw_used; + } + + ti = unswdev; + if (ti >= swap_max) + ti = swap_max - 1; + if (ti >= 0) + swap_ary[ti] = tot; + + return(ti); +} + +static int +getsysctl ( + kvm_t *kd, + char *name, + void *ptr, + size_t len +) { + size_t nlen = len; + if (sysctlbyname(name, ptr, &nlen, NULL, 0) == -1) { + _kvm_err(kd, kd->program, "cannot read sysctl %s:%s", name, + strerror(errno)); + return (0); + } + if (nlen != len) { + _kvm_err(kd, kd->program, "sysctl %s has unexpected size", name); + return (0); + } + return (1); +} |
