Set file permissions using C++

[EngieOP]

Using C, if I wanted to create a file with read/write permissions for the owner I would do this:



int fd;
fd = open("filename", O_CREAT, S_IRUSR | S_IWUSR);



What is the equivalent with C++?



ofstream os;
os.open("filename", ?);

[spjackson]

Standard C++ does not provide a means of specifying file permissions, therefore any method will be implementation dependent. If you are using g++, libstdc++ on *nix, then you can use open() and construct your stream from the resultant file descriptor. See https://gcc.gnu.org/onlinedocs/libstdc++/manual/ext_io.html

Alternatively, you can create the file with open(), close it and reopen with ofstream. Possibly Boost filesystem (http://www.boost.org/doc/libs/1_56_0/libs/filesystem/doc/index.htm) has something.