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## Name
access - check if a file is accessible
## Synopsis
```**c++
#include <unistd.h>
int access(const char* path, int mode);
```
## Description
Check if a file at the given *path* exists and is accessible to the current user for the given *mode*.
Valid flags for *mode* are:
* `F_OK` to check if the file is accessible at all,
* `R_OK` to check if the file can be read,
* `W_OK` to check if the file can be written to,
* `X_OK` to check if the file can be executed as a program.
## Return value
If the file is indeed accessible for the specified *mode*, `access()` returns 0. Otherwise, it returns -1 and sets `errno` to describe the error.
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