A utility for generating process fork tree images.
To compile the example, run the following command:
```bash
gcc examples/example-1.c fork_tree.c -o example-1
```
You need to create a .c file with the code you want to see the fork tree.
In this file, you must include the fork_tree.h file and create a fork_tree_t. After that, you should replace all fork() calls with fork_tree_fork(&fork_tree). Lastly, you should call the function fork_tree_render_centralized_svg or fork_tree_render_dense_svg
eg.
#include "fork_tree.h"
int main(int argc, char* argv[]) {
// Gets the process id of the root process
pid_t root_process_id = getpid();
// Creates the structure that represents the process tree
fork_tree_t fork_tree;
// Initializes the structure
fork_tree_init(&fork_tree);
/**
* Your code here
* eg. fork_tree_fork(&fork_tree);
**/
// Waits for all processes to finish
while (wait(NULL) > 0)
;
// Only the root process will render the tree
if (getpid() == root_process_id) {
// Opens the file to write the SVG
FILE* file = fopen("output.svg", "w");
/**
* Renders the tree in the file
* The first parameter is the structure that represents the tree
* The second parameter is the file to write the SVG
*
* If the function returns -1, an error occurred
* If the function returns 0, the tree was rendered successfully
*
* This function can be replaced by fork_tree_render_centralized_svg to render the tree in a centralized way
*
**/
if (fork_tree_render_dense_svg(&fork_tree, file) == -1) {
printf("Error while rendering tree\n");
return -1;
}
// Closes the file
fclose(file);
// Destroys the structure
fork_tree_destroy(&fork_tree);
}
return 0;
}This is the code used to generate the image below, which can be found in the examples folder.
/**
* Example 1
**/
for (int i = 0; i < 4; i++) {
if (fork_tree_fork(tree) != 0) {
for (int j = i; j < 4; j++) {
if (fork_tree_fork(tree) != 0) {
break;
}
}
break;
}
}
In the fork_tree.c file, you can change the following constants to customize the tree:
-
CIRCLE_SIZE: The size of the circles
-
CIRCLE_MARGIN_X: The horizontal margin between the circles
-
CIRCLE_MARGIN_Y: The vertical margin between the circles
-
DOCUMENT_MARGIN: The margin of the document
-
BACKGROUND_COLOR: The background color of the document
-
CIRCLE_COLOR: The color of the circles
-
TEXT_COLOR: The color of the text (PID)
-
LINE_COLOR: The color of the lines
-
CONNECTOR_COLOR: The color of the connectors (circles that connect the lines)
-
CIRCLE_SHADOW_COLOR: The color of the shadow of the circles
-
CIRCLE_SHADOW_BLUR: The blur of the shadow of the circles
-
CIRCLE_SHADOW_COLOR_OPACITY: The opacity of the shadow of the circles
Example:
#define CIRCLE_SIZE 60
#define CIRCLE_MARGIN_X 20
#define CIRCLE_MARGIN_Y 40
#define DOCUMENT_MARGIN 20
#define BACKGROUND_COLOR "#162A29"
#define CIRCLE_COLOR "#FFFFFF"
#define LINE_COLOR "#22C84A"
#define TEXT_COLOR "#000000"
#define CONNECTOR_COLOR "#50FA7B"
#define CIRCLE_SHADOW_COLOR "#000000"
#define CIRCLE_SHADOW_BLUR "10"
#define CIRCLE_SHADOW_COLOR_OPACITY "0.3"
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