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https://codeberg.org/ziglang/zig.git
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a2ea36a517
The vast majority of libc functions return `c_int` for the return value, when setting errno. This utility function is for those cases. Other cases can hand-roll the logic, or additional helpers can be added.
33 lines
1 KiB
Zig
33 lines
1 KiB
Zig
const builtin = @import("builtin");
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const std = @import("std");
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pub const linkage: std.builtin.GlobalLinkage = if (builtin.is_test)
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.internal
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else
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.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 = if (linkage != .internal)
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.hidden
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else
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.default;
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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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