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Detect virtual machines on FreeBSD using the kern.vm_guest sysctl

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kern.vm_guest == none -> not a virtual machine

It's a bit of a misnomer with the function being named `isQEMU`... but FreeBSD's
support seems to be a bit more all-encompassing than NetBSD's is today.

Sponsored by: EMC / Isilon Storage Division
This commit is contained in:
Enji Cooper 2016-08-26 03:46:43 +00:00
parent ed04e0c3dc
commit aaf3e744fd
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/projects/netbsd-tests-update-12/; revision=304830
1 changed files with 25 additions and 0 deletions
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25
contrib/netbsd-tests/lib/libc/gen/isqemu.h
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@ -41,6 +41,30 @@
static __inline bool
isQEMU(void) {
#ifdef __FreeBSD__
char *vm_guest_name_buf;
size_t len;
bool is_vm;
if (sysctlbyname("kern.vm_guest", NULL, &len, NULL, 0) == -1)
err(EXIT_FAILURE, "sysctl");
if ((vm_guest_name_buf = malloc(len)) == NULL)
err(EXIT_FAILURE, "malloc");
if (sysctlbyname("kern.vm_guest", vm_guest_name_buf, &len, NULL, 0)
== -1)
err(EXIT_FAILURE, "sysctl");
if (strcmp(vm_guest_name_buf, "none") == 0)
is_vm = false;
else
is_vm = true;
free(vm_guest_name_buf);
return is_vm;
#else
#if defined(__i386__) || defined(__x86_64__)
char name[1024];
size_t len = sizeof(name);
@ -54,6 +78,7 @@ isQEMU(void) {
#else
return false;
#endif
#endif
}
#ifdef TEST