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
37DEFINE_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".
47RawFD 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
59void 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
70void 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
89RawFD RawOpenForWriting(const char* filename) {
90  return open(filename, O_WRONLY|O_CREAT|O_TRUNC, 0664);
91}
92
93void 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
103void RawClose(RawFD fd) {
104  NO_INTR(close(fd));
105}
106
107#endif  // _WIN32 || __CYGWIN__ || __CYGWIN32__
108