source: trunk/third/sysinfo/getkernver.c @ 11115

/*
 * Copyright (c) 1992-1996 Michael A. Cooper.
 * This software may be freely used and distributed provided it is not sold 
 * for profit or used for commercial gain and the author is credited 
 * appropriately.
 */

#ifndef lint
static char *RCSid = "$Id: getkernver.c,v 1.1.1.2 1998-02-12 21:32:05 ghudson Exp $";
#endif


/*
 * Kernel related functions.
 */

#include "defs.h"

#if !defined(VERSION_SYM)
#       define VERSION_SYM      "_version"
#endif

/*
 * Get kernel version string by reading the
 * symbol "version" from the kernel.
 */
extern char *GetKernVerSym()
{
    nlist_t                    *nlptr;
    static char                 Buf[BUFSIZ];
    register char              *p;
    kvm_t                      *kd;

    if (kd = KVMopen()) {
        if ((nlptr = KVMnlist(kd, VERSION_SYM, (nlist_t *)NULL, 0)) == NULL)
            return((char *) NULL);

        if (CheckNlist(nlptr))
            return((char *) NULL);

        if (KVMget(kd, nlptr->n_value, (char *) Buf, sizeof(Buf), KDT_STRING)){
            if (Debug) Error("Read of \"%s\" from kernel failed.",
                             VERSION_SYM);
            Buf[0] = C_NULL;
        }
    }

    if (kd)
        KVMclose(kd);

#if     defined(KERNSTR_END)
    /*
     * Truncate extraneous info
     */
    if (Buf[0])
        if ((p = strchr(Buf, KERNSTR_END)) != NULL)
            *p = C_NULL;
#endif  /* KERNSTR_END */

    return( (Buf[0]) ? Buf : (char *) NULL);
}

/*
 * Get kernel version string
 */
extern char *GetKernVer()
{
    extern PSI_t               GetKernVerPSI[];
    static char               *Str = NULL;

    if (Str)
        return(Str);

    return(Str = PSIquery(GetKernVerPSI));
}