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Truncate the file used for the region mapping

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This commit is contained in:
Alexey Rybalchenko
2020-04-28 19:17:47 +02:00
parent 960b612d80
commit 5a49c5b9b1
1 changed files with 12 additions and 1 deletions
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13
fairmq/shmem/Region.cxx
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@@ -19,6 +19,7 @@
#include <cerrno>
#include <chrono>
#include <ios>
using namespace std;
@@ -49,7 +50,17 @@ Region::Region(Manager& manager, uint64_t id, uint64_t size, bool remote, Region
if (path != "") {
fName = string(path + fName);
fFile = fopen(fName.c_str(), fRemote ? "r+" : "w+");
if (!fRemote) {
// create a file
filebuf fbuf;
if (fbuf.open(fName, ios_base::in | ios_base::out | ios_base::trunc | ios_base::binary)) {
// set the size
fbuf.pubseekoff(size - 1, ios_base::beg);
fbuf.sputc(0);
}
}
fFile = fopen(fName.c_str(), "r+");
if (!fFile) {
LOG(error) << "Failed to initialize file: " << fName;