mirror of
https://codeberg.org/ziglang/zig.git
synced 2026-03-08 04:04:44 +01:00
96bd268c8c
- use symbol export helper - move all declarations from common.zig into c.zig - correct documentation - delete dead code
65 lines
2.3 KiB
Zig
65 lines
2.3 KiB
Zig
//! Multi-target implementation of libc, providing ABI compatibility with
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//! bundled libcs.
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//!
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//! mingw-w64 libc is not fully statically linked, so some symbols don't need
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//! to be exported. However, a future enhancement could be eliminating Zig's
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//! dependency on msvcrt dll even when linking libc and targeting Windows.
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const builtin = @import("builtin");
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const std = @import("std");
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// Avoid dragging in the runtime safety mechanisms into this .o file, unless
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// we're trying to test zigc.
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pub const panic = if (builtin.is_test)
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std.debug.FullPanic(std.debug.defaultPanic)
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else
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std.debug.no_panic;
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/// It is incorrect to make this conditional on `builtin.is_test`, because it is possible that
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/// libzigc is being linked into a different test compilation, as opposed to being tested itself.
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pub const linkage: std.builtin.GlobalLinkage = .strong;
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/// Determines the symbol's visibility to other objects.
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/// For WebAssembly this allows the symbol to be resolved to other modules, but will not
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/// export it to the host runtime.
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pub const visibility: std.builtin.SymbolVisibility = .hidden;
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pub inline fn symbol(comptime func: *const anyopaque, comptime name: []const u8) void {
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@export(func, .{ .name = name, .linkage = linkage, .visibility = visibility });
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}
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/// Given a low-level syscall return value, sets errno and returns `-1`, or on
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/// success returns the result.
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pub fn errno(syscall_return_value: usize) c_int {
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return switch (builtin.os.tag) {
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.linux => {
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const signed: isize = @bitCast(syscall_return_value);
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const casted: c_int = @intCast(signed);
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if (casted < 0) {
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@branchHint(.unlikely);
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std.c._errno().* = -casted;
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return -1;
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}
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return casted;
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},
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else => comptime unreachable,
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};
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}
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comptime {
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_ = @import("c/inttypes.zig");
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_ = @import("c/ctype.zig");
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_ = @import("c/stdlib.zig");
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_ = @import("c/math.zig");
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_ = @import("c/string.zig");
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_ = @import("c/strings.zig");
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_ = @import("c/wchar.zig");
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_ = @import("c/sys/mman.zig");
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_ = @import("c/sys/file.zig");
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_ = @import("c/sys/reboot.zig");
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_ = @import("c/sys/capability.zig");
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_ = @import("c/sys/utsname.zig");
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_ = @import("c/unistd.zig");
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}
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