Improve system call wrappers

This change improves copy_file_range(), sendfile(), splice(), openpty(),
closefrom(), close_range(), fadvise() and posix_fadvise() in addition to
writing tests that confirm things like errno and seeking behavior across
platforms. We now less aggressively polyfill behavior with some of these
functions when the platform support isn't available. Please see:

https://justine.lol/cosmopolitan/functions.html

libc/intrin/describeflags.internal.h

@@ -20,6 +20,7 @@ const char *DescribeFrame(char[32], int);
 const char *DescribeFutexOp(char[64], int);
 const char *DescribeFutexResult(char[12], int);
 const char *DescribeHow(char[12], int);
+const char *DescribeInOutInt64(char[23], ssize_t, int64_t *);
 const char *DescribeMapFlags(char[64], int);
 const char *DescribeMapping(char[8], int, int);
 const char *DescribeNtConsoleInFlags(char[256], uint32_t);
@@ -64,6 +65,7 @@ const char *DescribeWhence(char[12], int);
 #define DescribeFutexOp(x)           DescribeFutexOp(alloca(64), x)
 #define DescribeFutexResult(x)       DescribeFutexResult(alloca(12), x)
 #define DescribeHow(x)               DescribeHow(alloca(12), x)
+#define DescribeInOutInt64(rc, x)    DescribeInOutInt64(alloca(23), rc, x)
 #define DescribeMapFlags(x)          DescribeMapFlags(alloca(64), x)
 #define DescribeMapping(x, y)        DescribeMapping(alloca(8), x, y)
 #define DescribeNtConsoleInFlags(x)  DescribeNtConsoleInFlags(alloca(256), x)

libc/intrin/describeinoutint64.c

@@ -0,0 +1,37 @@
+/*-*- 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/errno.h"
+#include "libc/fmt/itoa.h"
+#include "libc/intrin/describeflags.internal.h"
+
+const char *(DescribeInOutInt64)(char buf[23], ssize_t rc, int64_t *x) {
+  if (!x) return "NULL";
+  char *p = buf;
+  if (rc != -1) *p++ = '[';
+  if (rc == -1 && errno == EFAULT) {
+    *p++ = '!';
+    *p++ = '!';
+    *p++ = '!';
+  } else {
+    p = FormatInt64(p, *x);
+  }
+  if (rc != -1) *p++ = ']';
+  *p = 0;
+  return buf;
+}

libc/intrin/pthread_mutex_trylock.c

@@ -34,7 +34,7 @@
  * @raise EBUSY if lock is already held
  * @raise ENOTRECOVERABLE if `mutex` is corrupted
  */
-int pthread_mutex_trylock(pthread_mutex_t *mutex) {
+errno_t pthread_mutex_trylock(pthread_mutex_t *mutex) {
   int c, d, t;
 
   if (__tls_enabled &&                               //

libc/intrin/pthread_once.c

@@ -44,7 +44,7 @@
  *
  * @return 0 on success, or errno on error
  */
-int pthread_once(pthread_once_t *once, void init(void)) {
+errno_t pthread_once(pthread_once_t *once, void init(void)) {
   uint32_t old;
   if (_weaken(nsync_run_once)) {
     _weaken(nsync_run_once)((nsync_once *)once, init);

libc/intrin/restoretty.c

@@ -40,10 +40,10 @@ static bool __isrestorable;
 static union metatermios __oldtermios;
 
 // called weakly by libc/calls/ioctl_tcsets.c to avoid pledge("tty")
-void __on_ioctl_tcsets(void) {
+void __on_ioctl_tcsets(int fd) {
   int e;
   e = errno;
-  if (sys_ioctl(0, TCGETS, &__oldtermios) != -1) {
+  if (sys_ioctl(fd, TCGETS, &__oldtermios) != -1) {
     __isrestorable = true;
   }
   errno = e;