如何获取临时文件名？

Question

I've seen some posts relating to my question, but none that address it completely. I need to create a file in the standard temporary directory and after I'm done writing to it, move it to a different location. The idea is that the file is considered temporary while being downloaded and permanent after downloading completes.

I'm attempting this by calling either mkstemp or tmpfile , then rename after I'm done writing to it. However, I need the full path of the file to call rename, and apparently getting the file name from a file descriptor (returned by mkstemp) or FILE * (returned by tmpfile) is no trivial process. It can be done, but it's not elegant.

Is there a system call that will create a temporary file and provide me with the name? I know about mktemp and related calls, but they either aren't guaranteed to be unique or are deprecated. Or perhaps there is a better way to accomplish creating, writing to, and moving temporary files.

Answer 1

It looks like mkstemp is actually the way to go.

int fd;
char name[] = "/tmp/fileXXXXXX";
fd = mkstemp(name);
/* Check fd. */

After this call you have a valid descriptor in fd and the name of the associated file in name .