third_party/tcmalloc/chromium/src/base/logging.cc

   1 // Copyright (c) 2007, Google Inc.
   2 // All rights reserved.
   3 //
   4 // Redistribution and use in source and binary forms, with or without
   5 // modification, are permitted provided that the following conditions are
   6 // met:
   7 //
   8 //     * Redistributions of source code must retain the above copyright
   9 // notice, this list of conditions and the following disclaimer.
  10 //     * Redistributions in binary form must reproduce the above
  11 // copyright notice, this list of conditions and the following disclaimer
  12 // in the documentation and/or other materials provided with the
  13 // distribution.
  14 //     * Neither the name of Google Inc. nor the names of its
  15 // contributors may be used to endorse or promote products derived from
  16 // this software without specific prior written permission.
  17 //
  18 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  19 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  20 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  21 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  22 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  23 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  24 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  25 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  26 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  27 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  28 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  29
  30 // ---
  31 // This file just provides storage for FLAGS_verbose.
  32
  33 #include <config.h>
  34 #include "base/logging.h"
  35 #include "base/commandlineflags.h"
  36
  37 DEFINE_int32(verbose, EnvToInt("PERFTOOLS_VERBOSE", 0),
  38              "Set to numbers >0 for more verbose output, or <0 for less.  "
  39              "--verbose == -4 means we log fatal errors only.");
  40
  41
  42 #if defined(_WIN32) || defined(__CYGWIN__) || defined(__CYGWIN32__)
  43
  44 // While windows does have a POSIX-compatible API
  45 // (_open/_write/_close), it acquires memory.  Using this lower-level
  46 // windows API is the closest we can get to being "raw".
  47 RawFD RawOpenForWriting(const char* filename) {
  48   // CreateFile allocates memory if file_name isn't absolute, so if
  49   // that ever becomes a problem then we ought to compute the absolute
  50   // path on its behalf (perhaps the ntdll/kernel function isn't aware
  51   // of the working directory?)
  52   RawFD fd = CreateFileA(filename, GENERIC_WRITE, 0, NULL,
  53                          CREATE_ALWAYS, 0, NULL);
  54   if (fd != kIllegalRawFD && GetLastError() == ERROR_ALREADY_EXISTS)
  55     SetEndOfFile(fd);    // truncate the existing file
  56   return fd;
  57 }
  58
  59 void RawWrite(RawFD handle, const char* buf, size_t len) {
  60   while (len > 0) {
  61     DWORD wrote;
  62     BOOL ok = WriteFile(handle, buf, len, &wrote, NULL);
  63     // We do not use an asynchronous file handle, so ok==false means an error
  64     if (!ok) break;
  65     buf += wrote;
  66     len -= wrote;
  67   }
  68 }
  69
  70 void RawClose(RawFD handle) {
  71   CloseHandle(handle);
  72 }
  73
  74 #else  // _WIN32 || __CYGWIN__ || __CYGWIN32__
  75
  76 #ifdef HAVE_SYS_TYPES_H
  77 #include <sys/types.h>
  78 #endif
  79 #ifdef HAVE_UNISTD_H
  80 #include <unistd.h>
  81 #endif
  82 #ifdef HAVE_FCNTL_H
  83 #include <fcntl.h>
  84 #endif
  85
  86 // Re-run fn until it doesn't cause EINTR.
  87 #define NO_INTR(fn)  do {} while ((fn) < 0 && errno == EINTR)
  88
  89 RawFD RawOpenForWriting(const char* filename) {
  90   return open(filename, O_WRONLY|O_CREAT|O_TRUNC, 0664);
  91 }
  92
  93 void RawWrite(RawFD fd, const char* buf, size_t len) {
  94   while (len > 0) {
  95     ssize_t r;
  96     NO_INTR(r = write(fd, buf, len));
  97     if (r <= 0) break;
  98     buf += r;
  99     len -= r;
 100   }
 101 }
 102
 103 void RawClose(RawFD fd) {
 104   NO_INTR(close(fd));
 105 }
 106
 107 #endif  // _WIN32 || __CYGWIN__ || __CYGWIN32__