Mockable wrapper for POSIX functions

0.2.0 2024-01-20 12:01 UTC

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Last update: 2024-05-20 13:13:30 UTC


Mockable wrapper for POSIX functions.

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The library provides the interface axy\posix\IPosix which almost completely reproduces the POSIX functions list. The standard implementation is also provided. It is the RealPosix class that just delegates execution to those functions.

What benefits of using this? Except of some minor improvements (see below), using an object with a specified interface allows you to change implementation. Firstly, this is useful for tests. The RealPosix itself provides the listener functionality (see below).


The interface contains methods similar to standard posix_*() functions.

  • Method names doesn't contain prefix posix_. Otherwise, the names as identical. It can be possible change they to more human-readable style, but it is the standard, you know.
  • An exception is thrown when an error is happened (standard functions usually return FALSE).
  • For same reason there are no methods for get the last error code.
  • Structures that are returned by some methods (getgrgid() for example) are converted to objects of certain data-classes (standard functions return associative arrays).


Are located in axy\posix\exceptions:

  • IPosixException - the main interface
    • PosixException - a standard function error (extends LogicException, just because)
      • The constructor takes an error code as only argument
      • An exception object has readonly properties:
        • $posixErrorCode (int) - the origin error code, is equal to the exception code
        • $posixErrorConstant (?string) - the error constant name (EPERM for example, NULL if not defined)
        • $posixErrorMessage (string) - the error message as posix_strerror() returned
    • PosixNotImplementedException - the corresponding function is not defined (for example, getpgid is not defined on all systems, some functions were added in 8.3)


All the following structures is data classes. Each of them has the property $data that contains the original array and other named properties for elements of that array.

  • PosicUserInfo - returned by getpwnam(), getpwuid()
  • PosixGroupInfo - returned by getgrgid(), getgrnam()
  • PosixTimesInfo - returned by times()
  • PosixUnameInfo - returned by uname()
  • PosixResourceLimits - returned by getrlimits(), contains two subobjects hard and soft with a similar structure


All constants that used as method arguments are collected in the PosixConstants class. These are just copies of the standard constants (without the prefix POSIX_). The PHP version allows collect these in the IPosix but this would clutter the interface with rarely used elements.

Error codes

Error codes constants are collected in PosixErrors. There is a method PosixErrors::getConstName(int $code): ?string that returns the constant name for a code.


Listeners for RealPosix allow to make a logger or a simple mock.

$posix = new RealPosix($listener);

A listener must implement axy\posix\IPosixListener or extend PosixListener. There are two methods:

  • before(string $method, array $args, ?int &$code = null): mixed
  • after(string $method, array $args, mixed $result, ?int &$code = null): mixed

before() is called before the call of a real function. It takes the method name (such "getgid", without the prefix) and the arguments list. If it returns any value except NULL it is considered as the result and the real function is not called.

after() is called, respectively, at the end and takes also $result (as the result of performance, it also can be the result of before()). It can change the result and return it. If you don't want change result here just return the $result argument.

  • Both methods must return values in the standard function format. For getgrgid() it is an array, not a data object.
  • The methods must follow the return value type. If they return int when string is required it will lead to the fatal error.
  • To signal an error they can throw PosixException or return the standard value for this case (usually it is FALSE or -1).
  • Both method takes $code by a link and can change it. It will be used as the error code if an error will be detected. before() takes it as NULL, after() takes it changed by before() or the real error code. If an error is happened and $code was not changed by listeners will be used the real code from posix_get_last_error().