CreateFile CREATE_NEW equivalent on linux

Question

I wrote a method which tries to create a file. However I set the flag CREATE_NEW so it can only create it when it doesnt exist. It looks like this:

for (;;)
         


        

Answer 1

Take a look at the open() manpage, the combination of O_CREAT and O_EXCL is what you are looking for.

Example:

mode_t perms = S_IRWXU; // Pick appropriate permissions for the new file.
int fd = open("file", O_CREAT|O_EXCL, perms);
if (fd >= 0) {
    // File successfully created.
} else {
    // Error occurred. Examine errno to find the reason.
}