This was done by regex substitution with `sed`. I then manually went
over the entire diff and fixed any incorrect changes.
This diff also changes a lot of `callconv(.C)` to `callconv(.c)`, since
my regex happened to also trigger here. I opted to leave these changes
in, since they *are* a correct migration, even if they're not the one I
was trying to do!
looking at `man getgroups` and `info getgroups` this is given as an
example:
```c
// Here's how to use ‘getgroups’ to read all the supplementary group
// IDs:
gid_t *
read_all_groups (void)
{
int ngroups = getgroups (0, NULL);
gid_t *groups
= (gid_t *) xmalloc (ngroups * sizeof (gid_t));
int val = getgroups (ngroups, groups);
if (val < 0)
{
free (groups);
return NULL;
}
return groups;
}
```
getgroups(0, NULL) is used to get the count of groups so that the
correct count can be used to allocate a list of gid_t. This small changes makes this
possible.
equivalent example in Zig after the change:
```zig
// get the group count
const ngroups: usize = std.os.linux.getgroups(0, null);
if (ngroups <= 0) {
return error.GetGroupsError;
}
std.debug.print("number of groups: {d}\n", .{ngroups});
const groups_gids: []u32 = try alloc.alloc(u32, ngroups);
// populate an array of gid_t
_ = std.os.linux.getgroups(ngroups, @ptrCast(groups_gids));
```
The old isARM() function was a portability trap. With the name it had, it seemed
like the obviously correct function to use, but it didn't include Thumb. In the
vast majority of cases where someone wants to ask "is the target Arm?", Thumb
*should* be included.
There are exactly 3 cases in the codebase where we do actually need to exclude
Thumb, although one of those is in Aro and mirrors a check in Clang that is
itself likely a bug. These rare cases can just add an extra isThumb() check.
Once we upgrade to LLVM 20, these should be lowered verbatim rather than to
simply musl. Similarly, the special case in llvmMachineAbi() should go away.
This is a breaking change which updates the `rtattr.type` from `IFLA` to
`union { IFLA, IFA }`. `IFLA` is for the `RTM_*LINK` messages and `IFA`
is for the `RTM_*ADDR` messages.
Both glibc and musl use time64 as the base ABI for riscv32. This fixes the
`sleep` test in `std.time` hanging forever due to the libc functions reading
bogus values.
The compiler actually doesn't need any functional changes for this: Sema
does reification based on the tag indices of `std.builtin.Type` already!
So, no zig1.wasm update is necessary.
This change is necessary to disallow name clashes between fields and
decls on a type, which is a prerequisite of #9938.
The signature is documented as:
int link(const char *, const char *);
(see https://man7.org/linux/man-pages/man2/link.2.html or https://man.netbsd.org/link.2)
And its not some Linux extension, the [syscall
implementation](21b136cc63/fs/namei.c (L4794-L4797))
only expects two arguments too.
It probably *should* have a flags parameter, but its too late now.
I am a bit surprised that linking glibc or musl against code that invokes
a 'link' with three parameters doesn't fail (at least, I couldn't get any
local test cases to trigger a compile or link error).
The test case in std/posix/test.zig is currently disabled, but if I
manually enable it, it works with this change.
