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Improve example, so that it doesn't dump core when example module

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isn't loaded.
This commit is contained in:
Gleb Smirnoff 2013-07-17 12:28:48 +00:00
parent b13ce70710
commit 9fd7a1b3dd
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=253420
1 changed files with 6 additions and 2 deletions
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8
share/examples/kld/syscall/test/call.c
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@ -30,6 +30,7 @@
#include <sys/module.h>
#include <sys/syscall.h>
#include <err.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
@ -37,11 +38,14 @@
int
main(int argc __unused, char **argv __unused)
{
int syscall_num;
int modid, syscall_num;
struct module_stat stat;
stat.version = sizeof(stat);
modstat(modfind("sys/syscall"), &stat);
if ((modid = modfind("sys/syscall")) == -1)
err(1, "modfind");
if (modstat(modid, &stat) != 0)
err(1, "mostat");
syscall_num = stat.data.intval;
return syscall (syscall_num);
}