#include <array>
#include <boost/algorithm/string.hpp> /* split */
#include <boost/tokenizer.hpp>
+#include <cerrno>
#include <cinttypes>
#include <cstdint> /* intmax_t */
+#include <cstring> /* strerror */
#include <dlfcn.h>
#include <fcntl.h>
#include <fstream>
{
int fdin = open(src.c_str(), O_RDONLY);
xbt_assert(fdin >= 0, "Cannot read from %s. Please make sure that the file exists and is executable.", src.c_str());
- int fdout = open(target.c_str(), O_CREAT | O_RDWR, S_IRWXU);
- xbt_assert(fdout >= 0, "Cannot write into %s", target.c_str());
+ XBT_ATTRIB_UNUSED int unlink_status = unlink(target.c_str());
+ xbt_assert(unlink_status == 0 || errno == ENOENT, "Failed to unlink file %s: %s", target.c_str(), strerror(errno));
+ int fdout = open(target.c_str(), O_CREAT | O_RDWR | O_EXCL, S_IRWXU);
+ xbt_assert(fdout >= 0, "Cannot write into %s: %s", target.c_str(), strerror(errno));
XBT_DEBUG("Copy %" PRIdMAX " bytes into %s", static_cast<intmax_t>(fdin_size), target.c_str());
#if SG_HAVE_SENDFILE