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now using sysget() insetad of /dev/kmem, which means no suid or sgid. yay!

This commit is contained in:
lindes 2001-08-24 04:48:47 +00:00
parent c8686ba144
commit 86f03ae0be
1 changed files with 12 additions and 50 deletions
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62
arch/IRIX/getload.c
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@ -7,62 +7,24 @@
#include "ttyload.h"
#include <sys/fcntl.h>
#include <sys/sysmp.h> /* for sysmp() */
#include <sys/types.h> /* for lseek() */
#include <unistd.h> /* for lseek() */
// where's /dev/kmem? (just in case this ever changed)
#define KMEMFILE "/dev/kmem"
#include <sys/types.h> /* sys/syget.h needs this */
#include <sys/sysget.h> /* for sysget() */
void getload(load_list *loadavgs)
{
static int kmemfd = -1;
static load_t loadaddr;
sgt_cookie_t cookie;
if(kmemfd < 0) /* initialize, first-time only: */
{
/* first, figure out where in /dev/kmem space the load average
* data gets stored... */
loadaddr = sysmp(MP_KERNADDR, MPKA_AVENRUN);
SGT_COOKIE_INIT(&cookie);
SGT_COOKIE_SET_KSYM(&cookie, "avenrun");
/* and make sure that worked: */
if(loadaddr == -1)
{
perror("Couldn't determine load address");
exit(1);
}
/* then, if that worked, try to open kmem: */
kmemfd = open(KMEMFILE, O_RDONLY);
/* and verify: */
if(kmemfd < 0)
{
perror("Couldn't open " KMEMFILE);
exit(1);
}
}
/* assuming the above went well, we now pull out the load average
* data from kmem via a seek/read pair: */
/* first seek: */
if((lseek(kmemfd, loadaddr, SEEK_SET)) != loadaddr)
{
perror("Couldn't seek to load address");
exit(1);
}
/* then read: */
if((read(kmemfd,loadavgs,3*sizeof(load_t))) != 3*sizeof(load_t))
{
perror("Couldn't read load data");
exit(1);
}
/* and since IRIX uses an integer data type for this stuff, which is
/* since IRIX uses an integer data type for this stuff, which is
* 1024 times the floating-point equiv, we don't need to do any
* conversions, because that's what load_list uses (since ttyload
* was originally written for IRIX in the first place). */
if(sysget(SGT_KSYM, (char*)loadavgs, 3 * sizeof(load_t),
SGT_READ | SGT_SUM, &cookie) != (3 * sizeof(load_t)))
{
perror("Couldn't read load data, sysget failed");
exit(1);
}
}