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Don't do unsafe activities in the syscall handler.

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MFC after:	2 weeks
This commit is contained in:
Kris Kennaway 2001-09-01 07:40:19 +00:00
parent ffacb1a399
commit e65cded7f3
1 changed files with 18 additions and 4 deletions
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22
usr.sbin/iostat/iostat.c
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@ -109,6 +109,7 @@
#include <ctype.h>
#include <fcntl.h>
#include <kvm.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
@ -135,10 +136,12 @@ int num_devices;
struct device_selection *dev_select;
int maxshowdevs;
int dflag = 0, Iflag = 0, Cflag = 0, Tflag = 0, oflag = 0, Kflag = 0;
volatile sig_atomic_t phdr_flag = 0;
/* local function declarations */
static void usage(void);
static void phdr(int signo);
static void do_phdr();
static void devstats(int perf_select, long double etime, int havelast);
static void cpustats(void);
static int readvar(kvm_t *kd, const char *name, int nlid, void *ptr,
@ -433,6 +436,11 @@ main(int argc, char **argv)
}
}
if (phdr_flag) {
phdr_flag = 0;
do_phdr();
}
if (Cflag > 0) {
if (readvar(kd, "kern.cp_time", X_CP_TIME,
&cur.cp_time, sizeof(cur.cp_time)) != 0) {
@ -442,7 +450,7 @@ main(int argc, char **argv)
}
if (!--headercount) {
phdr(0);
do_phdr();
headercount = 20;
}
@ -484,7 +492,7 @@ main(int argc, char **argv)
errx(1, "%s", devstat_errbuf);
break;
case 1:
phdr(0);
do_phdr();
headercount = 20;
break;
default:
@ -519,7 +527,7 @@ main(int argc, char **argv)
errx(1,"%s", devstat_errbuf);
break;
case 1:
phdr(0);
do_phdr();
headercount = 20;
break;
default:
@ -571,6 +579,13 @@ main(int argc, char **argv)
static void
phdr(int signo)
{
phdr_flag = 1;
}
static void
do_phdr()
{
register int i;
int printed;
@ -622,7 +637,6 @@ phdr(int signo)
(void)printf(" us ni sy in id\n");
else
printf("\n");
}
static void