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Merged
merged 3 commits into from
Aug 15, 2025
Merged

Rewrite Linux syscalls generation #24702

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c5f10a3
Rewrite `generate_linux_syscalls` to be completely table based
The-King-of-Toasters Aug 5, 2025
6f60c8e
Linux: Update syscall list for 6.16
The-King-of-Toasters Aug 5, 2025
6080f2d
Linux: Use time64 syscalls when available
The-King-of-Toasters Aug 7, 2025
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102 changes: 77 additions & 25 deletions lib/std/os/linux.zig
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Original file line number Diff line number Diff line change
Expand Up @@ -144,6 +144,7 @@ pub const SYS = switch (@import("builtin").cpu.arch) {
else => syscalls.X64,
},
.xtensa => syscalls.Xtensa,
.or1k => syscalls.OpenRisc,
else => @compileError("The Zig Standard Library is missing syscall definitions for the target CPU architecture"),
};

Expand Down Expand Up @@ -643,7 +644,13 @@ pub fn futimens(fd: i32, times: ?*const [2]timespec) usize {
}

pub fn utimensat(dirfd: i32, path: ?[*:0]const u8, times: ?*const [2]timespec, flags: u32) usize {
return syscall4(.utimensat, @as(usize, @bitCast(@as(isize, dirfd))), @intFromPtr(path), @intFromPtr(times), flags);
return syscall4(
if (@hasField(SYS, "utimensat")) .utimensat else .utimensat_time64,
@as(usize, @bitCast(@as(isize, dirfd))),
@intFromPtr(path),
@intFromPtr(times),
flags,
);
}

pub fn fallocate(fd: i32, mode: i32, offset: i64, length: i64) usize {
Expand Down Expand Up @@ -685,19 +692,38 @@ pub const futex_param4 = extern union {
/// The futex_op parameter is a sub-command and flags. The sub-command
/// defines which of the subsequent paramters are relevant.
pub fn futex(uaddr: *const anyopaque, futex_op: FUTEX_OP, val: u32, val2timeout: futex_param4, uaddr2: ?*const anyopaque, val3: u32) usize {
return syscall6(.futex, @intFromPtr(uaddr), @as(u32, @bitCast(futex_op)), val, @intFromPtr(val2timeout.timeout), @intFromPtr(uaddr2), val3);
return syscall6(
if (@hasField(SYS, "futex")) .futex else .futex_time64,
@intFromPtr(uaddr),
@as(u32, @bitCast(futex_op)),
val,
@intFromPtr(val2timeout.timeout),
@intFromPtr(uaddr2),
val3,
);
}

/// Three-argument variation of the v1 futex call. Only suitable for a
/// futex_op that ignores the remaining arguments (e.g., FUTUX_OP.WAKE).
pub fn futex_3arg(uaddr: *const anyopaque, futex_op: FUTEX_OP, val: u32) usize {
return syscall3(.futex, @intFromPtr(uaddr), @as(u32, @bitCast(futex_op)), val);
return syscall3(
if (@hasField(SYS, "futex")) .futex else .futex_time64,
@intFromPtr(uaddr),
@as(u32, @bitCast(futex_op)),
val,
);
}

/// Four-argument variation on the v1 futex call. Only suitable for
/// futex_op that ignores the remaining arguments (e.g., FUTEX_OP.WAIT).
pub fn futex_4arg(uaddr: *const anyopaque, futex_op: FUTEX_OP, val: u32, timeout: ?*const timespec) usize {
return syscall4(.futex, @intFromPtr(uaddr), @as(u32, @bitCast(futex_op)), val, @intFromPtr(timeout));
return syscall4(
if (@hasField(SYS, "futex")) .futex else .futex_time64,
@intFromPtr(uaddr),
@as(u32, @bitCast(futex_op)),
val,
@intFromPtr(timeout),
);
}

/// Given an array of `futex2_waitone`, wait on each uaddr.
Expand Down Expand Up @@ -1053,28 +1079,32 @@ pub fn munlockall() usize {
}

pub fn poll(fds: [*]pollfd, n: nfds_t, timeout: i32) usize {
if (@hasField(SYS, "poll")) {
return syscall3(.poll, @intFromPtr(fds), n, @as(u32, @bitCast(timeout)));
} else {
return syscall5(
.ppoll,
@intFromPtr(fds),
return if (@hasField(SYS, "poll"))
return syscall3(.poll, @intFromPtr(fds), n, @as(u32, @bitCast(timeout)))
else
ppoll(
fds,
n,
@intFromPtr(if (timeout >= 0)
&timespec{
if (timeout >= 0)
@constCast(&timespec{
.sec = @divTrunc(timeout, 1000),
.nsec = @rem(timeout, 1000) * 1000000,
}
})
else
null),
0,
NSIG / 8,
null,
null,
);
}
}

pub fn ppoll(fds: [*]pollfd, n: nfds_t, timeout: ?*timespec, sigmask: ?*const sigset_t) usize {
return syscall5(.ppoll, @intFromPtr(fds), n, @intFromPtr(timeout), @intFromPtr(sigmask), NSIG / 8);
return syscall5(
if (@hasField(SYS, "ppoll")) .ppoll else .ppoll_time64,
@intFromPtr(fds),
n,
@intFromPtr(timeout),
@intFromPtr(sigmask),
NSIG / 8,
);
}

pub fn read(fd: i32, buf: [*]u8, count: usize) usize {
Expand Down Expand Up @@ -1598,7 +1628,11 @@ pub fn clock_gettime(clk_id: clockid_t, tp: *timespec) usize {
}
}
}
return syscall2(.clock_gettime, @intFromEnum(clk_id), @intFromPtr(tp));
return syscall2(
if (@hasField(SYS, "clock_gettime")) .clock_gettime else .clock_gettime64,
@intFromEnum(clk_id),
@intFromPtr(tp),
);
}

fn init_vdso_clock_gettime(clk: clockid_t, ts: *timespec) callconv(.c) usize {
Expand All @@ -1612,16 +1646,24 @@ fn init_vdso_clock_gettime(clk: clockid_t, ts: *timespec) callconv(.c) usize {
}

pub fn clock_getres(clk_id: i32, tp: *timespec) usize {
return syscall2(.clock_getres, @as(usize, @bitCast(@as(isize, clk_id))), @intFromPtr(tp));
return syscall2(
if (@hasField(SYS, "clock_getres")) .clock_getres else .clock_getres_time64,
@as(usize, @bitCast(@as(isize, clk_id))),
@intFromPtr(tp),
);
}

pub fn clock_settime(clk_id: i32, tp: *const timespec) usize {
return syscall2(.clock_settime, @as(usize, @bitCast(@as(isize, clk_id))), @intFromPtr(tp));
return syscall2(
if (@hasField(SYS, "clock_settime")) .clock_settime else .clock_settime64,
@as(usize, @bitCast(@as(isize, clk_id))),
@intFromPtr(tp),
);
}

pub fn clock_nanosleep(clockid: clockid_t, flags: TIMER, request: *const timespec, remain: ?*timespec) usize {
return syscall4(
.clock_nanosleep,
if (@hasField(SYS, "clock_nanosleep")) .clock_nanosleep else .clock_nanosleep_time64,
@intFromEnum(clockid),
@as(u32, @bitCast(flags)),
@intFromPtr(request),
Expand Down Expand Up @@ -2020,7 +2062,7 @@ pub fn recvmsg(fd: i32, msg: *msghdr, flags: u32) usize {

pub fn recvmmsg(fd: i32, msgvec: ?[*]mmsghdr, vlen: u32, flags: u32, timeout: ?*timespec) usize {
return syscall5(
.recvmmsg,
if (@hasField(SYS, "recvmmsg")) .recvmmsg else .recvmmsg_time64,
@as(usize, @bitCast(@as(isize, fd))),
@intFromPtr(msgvec),
vlen,
Expand Down Expand Up @@ -2369,11 +2411,21 @@ pub const itimerspec = extern struct {
};

pub fn timerfd_gettime(fd: i32, curr_value: *itimerspec) usize {
return syscall2(.timerfd_gettime, @bitCast(@as(isize, fd)), @intFromPtr(curr_value));
return syscall2(
if (@hasField(SYS, "timerfd_gettime")) .timerfd_gettime else .timerfd_gettime64,
@bitCast(@as(isize, fd)),
@intFromPtr(curr_value),
);
}

pub fn timerfd_settime(fd: i32, flags: TFD.TIMER, new_value: *const itimerspec, old_value: ?*itimerspec) usize {
return syscall4(.timerfd_settime, @bitCast(@as(isize, fd)), @as(u32, @bitCast(flags)), @intFromPtr(new_value), @intFromPtr(old_value));
return syscall4(
if (@hasField(SYS, "timerfd_settime")) .timerfd_settime else .timerfd_settime64,
@bitCast(@as(isize, fd)),
@as(u32, @bitCast(flags)),
@intFromPtr(new_value),
@intFromPtr(old_value),
);
}

// Flags for the 'setitimer' system call
Expand Down
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