Avoid creating a redundant zero APInt.

[oota-llvm.git] / lib / System / Unix / Unix.h

diff --git a/lib/System/Unix/Unix.h b/lib/System/Unix/Unix.h
index 71445094afd917e1699c7b895335087333b15718..b2c3160a415b3e551a348b3148d0e08d358a2f02 100644 (file)
--- a/lib/System/Unix/Unix.h
+++ b/lib/System/Unix/Unix.h
@@ -1,34 +1,101 @@
 //===- llvm/System/Unix/Unix.h - Common Unix Include File -------*- C++ -*-===//
-// 
+//
 //                     The LLVM Compiler Infrastructure
 //
-// This file was developed by Reid Spencer and is distributed under the 
-// University of Illinois Open Source License. See LICENSE.TXT for details.
-// 
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
 //===----------------------------------------------------------------------===//
 //
 // This file defines things specific to Unix implementations.
 //
 //===----------------------------------------------------------------------===//
 
+#ifndef LLVM_SYSTEM_UNIX_UNIX_H
+#define LLVM_SYSTEM_UNIX_UNIX_H
+
 //===----------------------------------------------------------------------===//
 //=== WARNING: Implementation here must contain only generic UNIX code that
 //===          is guaranteed to work on all UNIX variants.
 //===----------------------------------------------------------------------===//
 
 #include "llvm/Config/config.h"     // Get autoconf configuration settings
-#include <unistd.h>
 #include <cstdlib>
 #include <cstdio>
 #include <cstring>
 #include <cerrno>
+#include <string>
+#include <algorithm>
+
+#ifdef HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+
+#ifdef HAVE_SYS_TYPES_H
 #include <sys/types.h>
+#endif
+
+#ifdef HAVE_SYS_PARAM_H
 #include <sys/param.h>
+#endif
+
+#ifdef HAVE_ASSERT_H
 #include <assert.h>
-#include <string>
-#include <algorithm>
+#endif
+
+#ifdef TIME_WITH_SYS_TIME
+# include <sys/time.h>
+# include <time.h>
+#else
+# ifdef HAVE_SYS_TIME_H
+#  include <sys/time.h>
+# else
+#  include <time.h>
+# endif
+#endif
 
-inline void ThrowErrno(const std::string& prefix) {
-    char buffer[MAXPATHLEN];
-    throw prefix + ": " + strerror(errno);
+#ifdef HAVE_SYS_WAIT_H
+# include <sys/wait.h>
+#endif
+
+#ifndef WEXITSTATUS
+# define WEXITSTATUS(stat_val) ((unsigned)(stat_val) >> 8)
+#endif
+
+#ifndef WIFEXITED
+# define WIFEXITED(stat_val) (((stat_val) & 255) == 0)
+#endif
+
+/// This function builds an error message into \p ErrMsg using the \p prefix
+/// string and the Unix error number given by \p errnum. If errnum is -1, the
+/// default then the value of errno is used.
+/// @brief Make an error message
+static inline bool MakeErrMsg(
+  std::string* ErrMsg, const std::string& prefix, int errnum = -1) {
+  if (!ErrMsg)
+    return true;
+  char buffer[MAXPATHLEN];
+  buffer[0] = 0;
+  if (errnum == -1)
+    errnum = errno;
+#ifdef HAVE_STRERROR_R
+  // strerror_r is thread-safe.
+  if (errnum)
+    strerror_r(errnum,buffer,MAXPATHLEN-1);
+#elif HAVE_STRERROR
+  // Copy the thread un-safe result of strerror into
+  // the buffer as fast as possible to minimize impact
+  // of collision of strerror in multiple threads.
+  if (errnum)
+    strncpy(buffer,strerror(errnum),MAXPATHLEN-1);
+  buffer[MAXPATHLEN-1] = 0;
+#else
+  // Strange that this system doesn't even have strerror
+  // but, oh well, just use a generic message
+  sprintf(buffer, "Error #%d", errnum);
+#endif
+  *ErrMsg = prefix + buffer;
+  return true;
 }
+
+#endif