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Bug 870176 - Import chromium bug 20249. r=dvander

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This commit is contained in:
Matt Woodrow 2013-05-10 09:02:50 +12:00
parent a6bc13035f
commit bdbd53065b
1 changed files with 4 additions and 18 deletions
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22
ipc/chromium/src/base/shared_memory_posix.cc
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@ -194,29 +194,15 @@ bool SharedMemory::CreateOrOpen(const std::wstring &name,
// not portable." // not portable."
if (size && (posix_flags & (O_RDWR | O_CREAT))) { if (size && (posix_flags & (O_RDWR | O_CREAT))) {
// Get current size. // Get current size.
size_t current_size = 0;
struct stat stat; struct stat stat;
if (fstat(fileno(fp), &stat) != 0) if (fstat(fileno(fp), &stat) != 0)
return false; return false;
current_size = stat.st_size; size_t current_size = stat.st_size;
// Possibly grow. if (current_size != size) {
if (current_size < size) { if (ftruncate(fileno(fp), size) != 0)
if (fseeko(fp, current_size, SEEK_SET) != 0)
return false; return false;
size_t writesize = size - current_size; if (fseeko(fp, size, SEEK_SET) != 0)
scoped_array<char> buf(new char[writesize]);
memset(buf.get(), 0, writesize);
if (fwrite(buf.get(), 1, writesize, fp) != writesize) {
return false;
}
if (fflush(fp) != 0)
return false; return false;
} else if (current_size > size) {
// possibly shrink.
if ((ftruncate(fileno(fp), size) != 0) ||
(fflush(fp) != 0)) {
return false;
}
} }
} }