On Fri, Feb 14, 2025 at 09:22:54AM +0100, Thomas Klausner wrote:
> Perhaps we need to add code like FreeBSD has (to rust libc):
> https://github.com/rust-lang/libc/blob/2258bf0fb96767bcffbe3ed09b29a31ee54b549b/src/unix/bsd/freebsdlike/freebsd/mod.rs#L5340
Your rust binary calls __getvfsstat90 (according to ktrace), so the definition
in C is
nt getvfsstat(struct statvfs *, size_t, int)
__RENAME(__getvfsstat90);
and the argument needs to be an array of struct statvfs. The equivalent C
code should be something like:
---
#include <stdio.h>
#include <sys/statvfs.h>
int main(int argc, char **argv)
{
struct statvfs buf[20];
int ret = getvfsstat(buf, sizeof buf, ST_WAIT);
printf("ret %d\n", ret);
return 0;
}
---
(at least ktrace shows the same syscall for this) and this returns:
(gdb) p buf[0]
$2 = {f_flag = 20480, f_bsize = 32768, f_frsize = 4096, f_iosize = 32768,
f_blocks = 116136549, f_bfree = 112048364, f_bavail = 106241537,
f_bresvd = 5806827, f_files = 29092606, f_ffree = 28605067,
f_favail = 28605067, f_fresvd = 0, f_syncreads = 267410,
f_syncwrites = 12497, f_asyncreads = 2, f_asyncwrites = 4423, f_fsidx = {
__fsid_val = {43008, 1931}}, f_fsid = 43008, f_namemax = 255, f_owner = 0,
f_spare = {0, 0, 0, 0}, f_fstypename = "ffs", '\000' <repeats 28 times>,
f_mntonname = "/", '\000' <repeats 1022 times>,
f_mntfromname = "/dev/dk0", '\000' <repeats 1015 times>,
f_mntfromlabel = "G5root", '\000' <repeats 1017 times>}
so the problem must be with the rust libc definition of the struct.
Martin
