From owner-freebsd-arch Mon Jul 23 4: 7:24 2001 Delivered-To: freebsd-arch@freebsd.org Received: from ringworld.nanolink.com (ringworld.nanolink.com [195.24.48.39]) by hub.freebsd.org (Postfix) with SMTP id AB01137B405 for ; Mon, 23 Jul 2001 04:07:06 -0700 (PDT) (envelope-from roam@orbitel.bg) Received: (qmail 52907 invoked by uid 1000); 23 Jul 2001 11:06:20 -0000 Date: Mon, 23 Jul 2001 14:06:20 +0300 From: Peter Pentchev To: arch@FreeBSD.org Cc: audit@FreeBSD.org Subject: Re: sysctl(8) enhancement: display sysctl MIB's Message-ID: <20010723140620.A52175@ringworld.oblivion.bg> Mail-Followup-To: arch@FreeBSD.org, audit@FreeBSD.org References: <20010723004034.I882@ringworld.oblivion.bg> <20010723104201.855893E2F@bazooka.unixfreak.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.2.5i In-Reply-To: <20010723104201.855893E2F@bazooka.unixfreak.org>; from dima@unixfreak.org on Mon, Jul 23, 2001 at 03:42:01AM -0700 Sender: owner-freebsd-arch@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG On Mon, Jul 23, 2001 at 03:42:01AM -0700, Dima Dorfman wrote: [snip] > > I don't think checking printf()'s return value does anything other > than add more lines to the program. Most (none?) of the other > programs don't do it. Besides, what can you do when it fails? > Remember, err(3) calls it too... (well, it calls fprintf to write to > stderr, but you get the idea) [snip] > > If you're going to make show_varname() return something to indicate an > error (your code doesn't do that right now, but the return type is > 'int', and the comment says that it might fail in the future), you > should check the return value when you call it. Actually, I think > making the return type 'void' makes more sense: this is a support > routine (as opposed to an interface to something), and if it detects > an error, calling one of the err(3) functions would be cleaner than > doing error checking all over the place. > > > Other than that, I think it's a good idea. OK, a revised patch follows.. G'luck, Peter -- If the meanings of 'true' and 'false' were switched, then this sentence wouldn't be false. Index: src/sbin/sysctl/sysctl.8 =================================================================== RCS file: /home/ncvs/src/sbin/sysctl/sysctl.8,v retrieving revision 1.36 diff -u -r1.36 sysctl.8 --- src/sbin/sysctl/sysctl.8 2001/07/13 09:09:48 1.36 +++ src/sbin/sysctl/sysctl.8 2001/07/23 11:05:00 @@ -40,7 +40,7 @@ .Nd get or set kernel state .Sh SYNOPSIS .Nm -.Op Fl bNnox +.Op Fl bmNnox .Ar name Ns Op = Ns Ar value .Ar ... .Nm @@ -71,6 +71,11 @@ Force the value of the variable(s) to be output in raw, binary format. No names are printed and no terminating newlines are output. This is mostly useful with a single variable. +.It Fl m +Specify that the MIB numerical value should be printed before the name. +This flag only takes effect if +.Fl n +is not specified. .It Fl N Show only variable names, not their values. This is particularly useful with shells that offer programmable Index: src/sbin/sysctl/sysctl.c =================================================================== RCS file: /home/ncvs/src/sbin/sysctl/sysctl.c,v retrieving revision 1.37 diff -u -r1.37 sysctl.c --- src/sbin/sysctl/sysctl.c 2001/06/18 21:06:24 1.37 +++ src/sbin/sysctl/sysctl.c 2001/07/23 11:05:00 @@ -58,10 +58,11 @@ #include #include -static int aflag, bflag, Nflag, nflag, oflag, xflag; +static int aflag, bflag, mflag, Nflag, nflag, oflag, xflag; static int oidfmt(int *, int, char *, u_int *); static void parse(char *); +static void show_varname(const char *, const int *, int); static int show_var(int *, int); static int sysctl_all (int *oid, int len); static int name2oid(char *, int *); @@ -71,8 +72,8 @@ { (void)fprintf(stderr, "%s\n%s\n", - "usage: sysctl [-bNnox] variable[=value] ...", - " sysctl [-bNnox] -a"); + "usage: sysctl [-bmNnox] variable[=value] ...", + " sysctl [-bmNnox] -a"); exit(1); } @@ -83,7 +84,7 @@ setbuf(stdout,0); setbuf(stderr,0); - while ((ch = getopt(argc, argv, "AabNnowxX")) != -1) { + while ((ch = getopt(argc, argv, "AabmNnowxX")) != -1) { switch (ch) { case 'A': /* compatibility */ @@ -95,6 +96,9 @@ case 'b': bflag = 1; break; + case 'm': + mflag = 1; + break; case 'N': Nflag = 1; break; @@ -369,6 +373,30 @@ } /* + * This formats and outputs the name of one variable. + * If the -m command-line flag was specified, the MIB value + * is also printed out. + */ + +static void +show_varname(const char *name, const int *oid, int len) +{ + int i; + + if (nflag) + return; + + if (mflag) { + for (i = 0; i < len-1; i++) + printf("%X.", oid[i]); + printf("%X ", oid[i]); + } + + printf("%s: ", name); + return; +} + +/* * This formats and outputs the value of one variable * * Returns zero if anything was actually output. @@ -397,7 +425,7 @@ err(1, "sysctl name %d %d %d", i, j, errno); if (Nflag) { - printf("%s", name); + show_varname(name, oid, nlen); return (0); } @@ -430,14 +458,12 @@ p = val; switch (*fmt) { case 'A': - if (!nflag) - printf("%s: ", name); + show_varname(name, oid, nlen); printf("%s", p); return (0); case 'I': - if (!nflag) - printf("%s: ", name); + show_varname(name, oid, nlen); fmt++; val = ""; while (len >= sizeof(int)) { @@ -452,8 +478,7 @@ return (0); case 'L': - if (!nflag) - printf("%s: ", name); + show_varname(name, oid, nlen); fmt++; val = ""; while (len >= sizeof(long)) { @@ -468,8 +493,7 @@ return (0); case 'P': - if (!nflag) - printf("%s: ", name); + show_varname(name, oid, nlen); printf("%p", *(void **)p); return (0); @@ -487,16 +511,14 @@ else func = NULL; if (func) { - if (!nflag) - printf("%s: ", name); + show_varname(name, oid, nlen); return ((*func)(len, p)); } /* FALL THROUGH */ default: if (!oflag && !xflag) return (1); - if (!nflag) - printf("%s: ", name); + show_varname(name, oid, nlen); printf("Format:%s Length:%d Dump:0x", fmt, len); while (len-- && (xflag || p < val + 16)) printf("%02x", *p++); To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-arch" in the body of the message