Make improvements

- More timspec_*() and timeval_*() APIs have been introduced.
- The copyfd() function is now simplified thanks to POSIX rules.
- More Cosmo-specific APIs have been moved behind the COSMO define.
- The setitimer() polyfill for Windows NT is now much higher quality.
- Fixed build error for MODE=aarch64 due to -mstringop-strategy=loop.
- This change introduces `make MODE=nox87 toolchain` which makes it
  possible to build programs using your cosmocc toolchain that don't
  have legacy fpu instructions. This is useful, for example, if you
  want to have a ~22kb tinier blink virtual machine.

libc/mem/copyfd.c

@@ -1,75 +0,0 @@
-/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
-│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8                                :vi│
-╞══════════════════════════════════════════════════════════════════════════════╡
-│ Copyright 2022 Justine Alexandra Roberts Tunney                              │
-│                                                                              │
-│ Permission to use, copy, modify, and/or distribute this software for         │
-│ any purpose with or without fee is hereby granted, provided that the         │
-│ above copyright notice and this permission notice appear in all copies.      │
-│                                                                              │
-│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL                │
-│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED                │
-│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE             │
-│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL         │
-│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR        │
-│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER               │
-│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR             │
-│ PERFORMANCE OF THIS SOFTWARE.                                                │
-╚─────────────────────────────────────────────────────────────────────────────*/
-#include "libc/calls/calls.h"
-#include "libc/errno.h"
-#include "libc/mem/mem.h"
-
-#define CHUNK 32768
-
-/**
- * Copies data between fds the old fashioned way.
- *
- * @return bytes successfully exchanged
- */
-ssize_t _copyfd(int infd, int outfd, size_t n) {
-  int e;
-  char *buf;
-  ssize_t rc;
-  size_t i, j, got, sent;
-  rc = 0;
-  if (n) {
-    if ((buf = malloc(CHUNK))) {
-      for (e = errno, i = 0; i < n; i += j) {
-        rc = read(infd, buf, CHUNK);
-        if (rc == -1) {
-          // eintr may interrupt the read operation
-          if (i && errno == EINTR) {
-            // suppress error if partially completed
-            errno = e;
-            rc = i;
-          }
-          break;
-        }
-        got = rc;
-        if (!got) {
-          rc = i;
-          break;
-        }
-        // write operation must complete
-        for (j = 0; j < got; j += sent) {
-          rc = write(outfd, buf + j, got - j);
-          if (rc != -1) {
-            sent = rc;
-          } else if (errno == EINTR) {
-            // write operation must be uninterruptible
-            errno = e;
-            sent = 0;
-          } else {
-            break;
-          }
-        }
-        if (rc == -1) break;
-      }
-      free(buf);
-    } else {
-      rc = -1;
-    }
-  }
-  return rc;
-}

libc/mem/copyfd.internal.h

@@ -1,10 +0,0 @@
-#ifndef COSMOPOLITAN_LIBC_MEM_IO_H_
-#define COSMOPOLITAN_LIBC_MEM_IO_H_
-#if !(__ASSEMBLER__ + __LINKER__ + 0)
-COSMOPOLITAN_C_START_
-
-ssize_t _copyfd(int, int, size_t);
-
-COSMOPOLITAN_C_END_
-#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
-#endif /* COSMOPOLITAN_LIBC_MEM_IO_H_ */