Zig 0.17.0-dev (Split by item)

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errno

Given a low-level syscall return value, sets errno and returns -1, or on success returns the result.

c.errno

pub fn errno(syscall_return_value: usize) c_int

File

lib/c.zig:47

Code

pub fn errno(syscall_return_value: usize) c_int {
    return switch (builtin.os.tag) {
        .linux => {
            const signed: isize = @bitCast(syscall_return_value);
            const casted: c_int = @intCast(signed);
            if (casted < 0) {
                @branchHint(.unlikely);
                std.c._errno().* = -casted;
                return -1;
            }
            return casted;
        },
        else => comptime unreachable,
    };
}