File path data type

A variable of type path_t can be used to hold the value of __file->path (refer to __file built in for I/O probe manager) or function fd_path(). Only local or global variables of type path_t are supported. A variable of this type can also be the key or value in an associative Array.

Declaration of file path variable

path_t pth; // global variable of type path_t
auto:pth2 = fd_path(fd); // store in a local path_t variable
my_aso[__file->fname] = __file->path; // store in associative array

The signed, unsigned, register, static, thread, and kernel qualifiers are not supported for the path_t type variables.

Assignment operation

The assignment (=) operator allows one path_t variable to be assigned to another path_t variable. The original value of the variable is overwritten.

path_t p1, p2;
p1 = fd_path(fd); // fd is a valid file descriptor value 
p2 = p1;

Comparison operation

Only equality (==) and inequality (!=) operators are allowed for the path_t variables. The result of the equality operator is true (1) if both represent the same absolute file path or false (0) otherwise.

The inequality operator is the exact compliment of this behavior. No other comparison operators (>=, >, <, or =<) are allowed for the path_t type variables.

Printing file path type variables

A path_t type variable can be printed with “%p” format specifier in the printf() function.

This printing of file path involves a time-consuming file search operation in the corresponding file system. Hence, it must be judiciously used in Vue scripts.

printf(“file path=[%p]\n”, __file->path); 
my_aso[0] = fd_path(fd); // fd is valid file descriptor value 
print(my_aso);