Avoid including unistd.h and replace write(STDERR) with fputs(stderr) (swiftlang#40177)

Author: kubamracek

stdlib/public/LLVMSupport/ErrorHandling.cpp

@@ -15,13 +15,11 @@
 #include "llvm/ADT/StringRef.h"
 #include <cassert>
 #include <cstdlib>
+#include <cstdio>
 
 #if defined(_MSC_VER)
 # include <io.h>
 # include <fcntl.h>
-#else
-# include <stdio.h>
-# include <unistd.h>
 #endif
 
 #include <stdarg.h>
@@ -49,7 +47,8 @@ void error(const char *fmt, ...) {
 #define STDERR_FILENO 2
   _write(STDERR_FILENO, buffer, strlen(buffer));
 #else
-  write(STDERR_FILENO, buffer, strlen(buffer));
+  fputs(buffer, stderr);
+  fflush(stderr);
 #endif
 }
 }

stdlib/public/runtime/Errors.cpp

@@ -25,8 +25,6 @@
 #include <string.h>
 #if defined(_WIN32)
 #include <io.h>
-#else
-#include <unistd.h>
 #endif
 #include <stdarg.h>
 
@@ -312,7 +310,8 @@ reportNow(uint32_t flags, const char *message)
 #define STDERR_FILENO 2
   _write(STDERR_FILENO, message, strlen(message));
 #else
-  write(STDERR_FILENO, message, strlen(message));
+  fputs(message, stderr);
+  fflush(stderr);
 #endif
 #if SWIFT_STDLIB_HAS_ASL
   asl_log(nullptr, nullptr, ASL_LEVEL_ERR, "%s", message);

stdlib/public/stubs/Random.cpp

@@ -25,7 +25,6 @@
 #else
 #include <errno.h>
 #include <fcntl.h>
-#include <unistd.h>
 #endif
 
 #if __has_include(<sys/random.h>)

stdlib/public/stubs/Stubs.cpp

@@ -32,7 +32,6 @@
 #include <errno.h>
 #endif
 #include <sys/resource.h>
-#include <unistd.h>
 #endif
 #include <climits>
 #include <clocale>