Reading file names from directory with SystemVerilog - system-verilog

Question

Using SystemVerilog I am trying to see if a file name already exists in my test directory.
For example I want to write a file called text_1a2b3c4d.txt but need it to have a unique name. The test will be run multiple times and a random hex number will be used in the file name.
I initially attempted to open the file with the following approach and check to see if a zero would be returned (which is does). The code completes, however, I get an warning when the file is not found, which I would like to avoid in the env I am working in.
module file_write;
int file_status = 1;
bit [31:0] rand_id;
string s_rand_id;
string file_name;
initial begin
while (file_status !== 0) begin
rand_id = $urandom(); // Generate rand 32 bit value
s_rand_id.hextoa(rand_id); // convert rand 32 bit value to string for file name
file_name = {"text_", s_rand_id, ".txt"}; // Create filename in format txt_rand#.txt
file_status = $fopen(file_name, "r");
if (file_status !==0) $display("Hex ID: %h already used, regenerating", rand_id);
$fclose(file_status); // Close file descriptor
end
$display("End of section");
end
endmodule
Is there a way to read all file names in a directory that way I could search for a name match? or are there other recommended ways to approach this? Any help would be appreciated.

Answer 1

Ended up finding a different approach which avoided the error. This involves using $system().
module file_write;
int file_status = 1;
bit [31:0] rand_id;
string s_rand_id;
string file_name;
initial begin
while (file_status !== 0) begin
rand_id = $urandom(); // Generates random 32-bit value
s_rand_id.hextoa(rand_id);
file_name = {"text_", s_rand_id, ".txt"}; // Create filename in format text_rand#.txt
if($system($sformatf("test -f ./folder/%s", file_name)) == 0) begin // File exists
$display("Hex ID: %h already used, regenerating", rand_id);
end
else begin // File does not
file_status = 0;
end
end
$display("End of section");
end
endmodule
The test -f command returns 0 when the file exists. This method does not propagate any warning/error messages in my environment, which satisfies my requirements.