Date: Thu, 1 Nov 2012 18:51:11 +0000 (UTC) From: Alfred Perlstein <alfred@FreeBSD.org> To: src-committers@freebsd.org, svn-src-user@freebsd.org Subject: svn commit: r242449 - user/alfred/9-alfred/sbin/dumpon Message-ID: <201211011851.qA1IpBue055452@svn.freebsd.org>
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Author: alfred Date: Thu Nov 1 18:51:11 2012 New Revision: 242449 URL: http://svn.freebsd.org/changeset/base/242449 Log: Add -l option to dumpon(8). Show which dumpdev is currently enabled. When dumps are disabled show _PATH_DEVNULL ("/dev/null"). Modified: user/alfred/9-alfred/sbin/dumpon/dumpon.c Modified: user/alfred/9-alfred/sbin/dumpon/dumpon.c ============================================================================== --- user/alfred/9-alfred/sbin/dumpon/dumpon.c Thu Nov 1 17:38:04 2012 (r242448) +++ user/alfred/9-alfred/sbin/dumpon/dumpon.c Thu Nov 1 18:51:11 2012 (r242449) @@ -46,6 +46,7 @@ __FBSDID("$FreeBSD$"); #include <sys/sysctl.h> #include <err.h> +#include <errno.h> #include <fcntl.h> #include <paths.h> #include <stdint.h> @@ -60,9 +61,10 @@ static int verbose; static void usage(void) { - fprintf(stderr, "%s\n%s\n", + fprintf(stderr, "%s\n%s\n%s\n", "usage: dumpon [-v] special_file", - " dumpon [-v] off"); + " dumpon [-v] off", + " dumpon -l"); exit(EX_USAGE); } @@ -92,15 +94,45 @@ check_size(int fd, const char *fn) } } +static void +listdumpdev(void) +{ + char dumpdev[PATH_MAX]; + size_t len; + const char *sysctlname = "kern.shutdown.dumpdevname"; + + len = sizeof(dumpdev); + if (sysctlbyname(sysctlname, &dumpdev, &len, NULL, 0) != 0) { + if (errno == ENOMEM) { + err(EX_OSERR, "Kernel returned too large of a buffer for '%s'\n", + sysctlname); + } else { + err(EX_OSERR, "Sysctl get '%s'\n", sysctlname); + } + } + if (verbose) { + printf("kernel dumps on "); + } + if (strlen(dumpdev) == 0) { + printf("%s\n", _PATH_DEVNULL); + } else { + printf("%s\n", dumpdev); + } +} + int main(int argc, char *argv[]) { int ch; int i, fd; u_int u; + int do_listdumpdev = 0; - while ((ch = getopt(argc, argv, "v")) != -1) + while ((ch = getopt(argc, argv, "lv")) != -1) switch((char)ch) { + case 'l': + do_listdumpdev = 1; + break; case 'v': verbose = 1; break; @@ -111,6 +143,11 @@ main(int argc, char *argv[]) argc -= optind; argv += optind; + if (do_listdumpdev) { + listdumpdev(); + exit(EX_OK); + } + if (argc != 1) usage();help
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