MAP_PRIVATE|MAP_ANON also works on Solaris. In fact, Linux is the
only platform where it doesn't work due to a bug in the Linux kernel
as Fabrice mentions:
http://www.qemu.org/kqemu-tech.html#SEC7
Technically on Solaris, /tmp is probably the same thing as
MAP_PRIVATE|MAP_ANON since the filesystem is actually mapped to
virtual memory... however, it's much cleaner to not use a file if not
necessary. I can post a reworked patch that makes the file mapping
for the Linux case only if anyone's interested, but it's a pretty
simple change.
- Leo Reiter
On 2/24/07, Juergen Lock <[EMAIL PROTECTED]> wrote:
In article <[EMAIL PROTECTED]> you write:
>-=-=-=-=-=-
>
>Ok FreeBSD Support round one..
>
>Be gentle this is my first attempt at working with the rest of this
>community..
>
>Files it modifies and the reasons are as follows
>
>configure - Adds HOST_FREEBSD type to alter included libraries FreeBSD does
>not need -ltr
>Makefile.target - Once again uses HOST_FREEBSD to avoid including -ltr
>
>osdeps.c - FreeBSD does not have /dev/shm so it uses /tmp for kqemu_valloc
>also sys/vfs.h is not part of freebsd stat information is part of
>mount.h/param.h
>...
Actually the port simply uses mmap MAP_PRIVATE|MAP_ANON, so no
tempfile is used at all (this is files/patch-osdep.c in the port):
Index: qemu/osdep.c
@@ -79,7 +79,9 @@
#if defined(USE_KQEMU)
+#ifndef __FreeBSD__
#include <sys/vfs.h>
+#endif
#include <sys/mman.h>
#include <fcntl.h>
@@ -90,6 +92,7 @@
const char *tmpdir;
char phys_ram_file[1024];
void *ptr;
+#ifndef __FreeBSD__
#ifdef HOST_SOLARIS
struct statvfs stfs;
#else
@@ -151,12 +154,20 @@
}
unlink(phys_ram_file);
}
+#endif
size = (size + 4095) & ~4095;
+#ifndef __FreeBSD__
ftruncate(phys_ram_fd, phys_ram_size + size);
ptr = mmap(NULL,
size,
PROT_WRITE | PROT_READ, MAP_SHARED,
phys_ram_fd, phys_ram_size);
+#else
+ ptr = mmap(NULL,
+ size,
+ PROT_WRITE | PROT_READ, MAP_PRIVATE|MAP_ANON,
+ -1, 0);
+#endif
if (ptr == MAP_FAILED) {
fprintf(stderr, "Could not map physical memory\n");
exit(1);
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