andre/cosmopolitan
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Make terminal ui binaries work well everywhere

Browse Source 
Here's some screenshots of an emulator tui program that was compiled on
Linux, then scp'd it to Windows, Mac, and FreeBSD.

https://justine.storage.googleapis.com/blinkenlights-cmdexe.png
https://justine.storage.googleapis.com/blinkenlights-imac.png
https://justine.storage.googleapis.com/blinkenlights-freebsd.png
https://justine.storage.googleapis.com/blinkenlights-lisp.png

How is this even possible that we have a nontrivial ui binary that just
works on Mac, Windows, Linux, and BSD? Surely a first ever achievement.

Fixed many bugs. Bootstrapped John McCarthy's metacircular evaluator on
bare metal in half the size of Altair BASIC (about 2.5kb) and ran it in
emulator for fun and profit.
This commit is contained in:
Justine Tunney
2020-10-10 21:18:53 -07:00
parent 680daf1210
commit 9e3e985ae5
276 changed files with 7026 additions and 3790 deletions
Download Patch File Download Diff File Expand all files Collapse all files

9
libc/calls/pwritev.c
View File

@@ -29,7 +29,12 @@
#define __NR_pwritev_linux 0x0128
/**
* Writes data from multiple buffers to file descriptor at offset.
* Writes data from multiple buffers to offset.
*
* Please note that it's not an error for a short write to happen. This
* can happen in the kernel if EINTR happens after some of the write has
* been committed. It can also happen if we need to polyfill this system
* call using pwrite().
*
* @param count is recommended to be 16 or fewer; if it exceeds IOV_MAX
* then the extra buffers are simply ignored
@@ -48,7 +53,7 @@ ssize_t pwritev(int fd, const struct iovec *iovec, int count, int64_t off) {
*/
if (!once) {
once = true;
if (IsLinux() && iovec->iov_len >= __NR_pwritev_linux) {
if (IsModeDbg() || (IsLinux() && iovec->iov_len >= __NR_pwritev_linux)) {
/*
* Write size is too large to detect older kernels safely without
* introducing nontrivial mechanics. We'll try again later.