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Compilation: don't give len=0 bufs to pwritev

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The OS returns EFAULT for undefined pointers, even when len=0.
This commit is contained in:
Andrew Kelley 2024-07-03 13:28:44 -07:00
parent cac7e5afc7
commit 29512f0edd
1 changed files with 3 additions and 0 deletions
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3
src/Compilation.zig
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@ -2827,6 +2827,9 @@ pub fn saveState(comp: *Compilation) !void {
}
fn addBuf(bufs_list: []std.posix.iovec_const, bufs_len: *usize, buf: []const u8) void {
// Even when len=0, the undefined pointer might cause EFAULT.
if (buf.len == 0) return;
const i = bufs_len.*;
bufs_len.* = i + 1;
bufs_list[i] = .{