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dup3Linux

unistd.dup3Linux

fn dup3Linux(old: c_int, new: c_int, flags: c_int) callconv(.c) c_int

File

lib/c/unistd.zig:114

Code

fn dup3Linux(old: c_int, new: c_int, flags: c_int) callconv(.c) c_int {
    const busy: usize = @bitCast(-@as(isize, @backingInt(linux.E.BUSY)));
    var res = busy;

    if (@hasField(linux.SYS, "dup3")) {
        while (res == busy) res = linux.dup3(old, new, @intCast(flags));
    } else if (@hasField(linux.SYS, "dup2")) {
        const cloexec: c_int = @bitCast(linux.O{ .CLOEXEC = true });
        const inval: usize = @bitCast(-@as(isize, @backingInt(linux.E.INVAL)));
        if (old == new or (flags & ~cloexec != 0)) return errno(inval);
        while (res == busy) res = linux.dup2(old, new);
        _ = if (res >= 0 and (flags & cloexec == cloexec)) linux.fcntl(new, linux.F.SETFD, linux.FD_CLOEXEC);
    } else {
        return errno(@bitCast(-@as(isize, @backingInt(linux.E.NOSYS))));
    }
    return errno(res);
}