1 files changed, 103 insertions, 0 deletions
diff --git a/src/common/linux/scoped_tmpfile.cc b/src/common/linux/scoped_tmpfile.cc
new file mode 100644
index 00000000..2395a64e
--- /dev/null
+++ b/src/common/linux/scoped_tmpfile.cc
@@ -0,0 +1,103 @@
+// Copyright 2022 Google LLC
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google LLC nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// Utility class for creating a temporary file that is deleted in the
+// destructor.
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>  // Must come first
+#endif
+
+#include "common/linux/scoped_tmpfile.h"
+
+#include <fcntl.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#include "common/linux/eintr_wrapper.h"
+
+#if !defined(__ANDROID__)
+#define TEMPDIR "/tmp"
+#else
+#define TEMPDIR "/data/local/tmp"
+#endif
+
+namespace google_breakpad {
+
+ScopedTmpFile::ScopedTmpFile() = default;
+
+ScopedTmpFile::~ScopedTmpFile() {
+  if (fd_ >= 0) {
+    close(fd_);
+    fd_ = -1;
+  }
+}
+
+bool ScopedTmpFile::InitEmpty() {
+  // Prevent calling Init when fd_ is already valid, leaking the file.
+  if (fd_ != -1) {
+    return false;
+  }
+
+  // Respect the TMPDIR environment variable.
+  const char* tempdir = getenv("TMPDIR");
+  if (!tempdir) {
+    tempdir = TEMPDIR;
+  }
+
+  // Create a temporary file that is not linked in to the filesystem, and that
+  // is only accessible by the current user.
+  fd_ = open(tempdir, O_TMPFILE | O_RDWR, S_IRUSR | S_IWUSR);
+
+  return fd_ >= 0;
+}
+
+bool ScopedTmpFile::InitString(const char* text) {
+  return InitData(text, strlen(text));
+}
+
+bool ScopedTmpFile::InitData(const void* data, size_t data_len) {
+  if (!InitEmpty()) {
+    return false;
+  }
+
+  return SetContents(data, data_len);
+}
+
+bool ScopedTmpFile::SetContents(const void* data, size_t data_len) {
+  ssize_t r = HANDLE_EINTR(write(fd_, data, data_len));
+  if (r != static_cast<ssize_t>(data_len)) {
+    return false;
+  }
+
+  return 0 == lseek(fd_, 0, SEEK_SET);
+}
+
+}  // namespace google_breakpad