Incorrectly reports exit code in sched_process_exit event

[rscampos]

Description

Tracee incorrectly reports the exit code after using the trigger program (attached), whereas it should simply report 1 and 77.

sudo ./dist/tracee -e sched_process_exit -s comm=trigger
TIME             UID    COMM             PID     TID     RET              EVENT                     ARGS
12:08:14:542122  1000   trigger          3133042 3133042 0                sched_process_exit        exit_code: 9, process_group_exit: true
12:08:14:542306  1000   trigger          3133041 3133041 0                sched_process_exit        exit_code: 19712, process_group_exit: true

Output of tracee version:

Tracee version: main-7bd8324e9

Output of uname -a:

Linux vagrant 5.15.0-105-generic #115-Ubuntu SMP Mon Apr 15 09:52:04 UTC 2024 aarch64 aarch64 aarch64 GNU/Linux

Additional details

Use the following code to trigger:

gcc -o trigger trigger.c

#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <signal.h>

int main() {
    printf("Forking process...\n");
    pid_t pid = fork();
    
    if (pid == 0) {
        printf("Child process running, PID: %d\n", getpid());
        sleep(10);
        printf("Child process exiting normally\n");
        exit(1);
    } else if (pid > 0) {
        // Parent process
        sleep(1);
        printf("Parent sending SIGKILL to child PID: %d\n", pid);
        kill(pid, SIGKILL);
        wait(NULL);
    } else {
        perror("fork");
        return 1;
    }

    exit(77);
}

[rscampos]

Fixed by #4564