Getting the last modified date of a file in C

Question

I want to get the last modified date of a file in C. Almost all sources I found use something along this snippet: ``` char *get_last_modified(char *file) { struct tm *clock; struct stat attr; stat(file, &attr); clock = gmtime(&(attr.st_mtime)); return asctime(clock); } ``` But the `attr` doesn't even have a field `st_mtime`, only `st_mtimespec`. Yet, when using this my Eclipse tells me that `passing argument 1 of 'gmtime' from incompatible pointer type` on the line `clock = gmtime(&(attr.st_mtimespec));` What am I doing wrong? PS: I'm developing on OSX Snow Leopard, Eclipse CDT and using GCC as Cross-Platform compiler

Accepted Answer

On OS X, `st_mtimespec.tv_sec` is the equivalent of `st_mtime`.

To make this portable, do

```
#ifdef __APPLE__
#ifndef st_mtime
#define st_mtime st_mtimespec.tv_sec
#endif
#endif
```

and then use `st_mtime`.

Getting the last modified date of a file in C

Solution

Problem