Signal example not working

[yzhang71]

Hi Wasmer community,

We are attempting to run the signal example provided below using the latest versions of Wasix and Wasmer (Wasmer 5.0.4). However, the example is not functioning as expected; it gets stuck in the while loop and keeps printing 'running...'.

#include <stdio.h>
#include <signal.h>
#include <unistd.h>
 
volatile int run = 1; // set to 0 when SIGINT is caught
 
/*
 * Signal handler function.
 * It is called when a signal is delivered to the process.
 */
void sig_handler(int signo)
{
    // SIGHUP is sent when user closes the terminal
    if (signo == SIGHUP)
    {
        run = 0; // set to 0 to terminate the program
        printf("received SIGHUP\n");
    }
    // SIGINT is sent when user presses Ctrl+C
    if (signo == SIGINT)
    {
        run = 0; // set to 0 to terminate the program
        printf("received SIGINT\n");
    }
}
 
int main(void)
{
    if (signal(SIGINT, sig_handler) == SIG_ERR)
        printf("\ncan't catch SIGINT\n");
    if (signal(SIGHUP, sig_handler) == SIG_ERR)
        printf("\ncan't catch SIGHUP\n");
 
    /*
     * Raise a SIGHUP signal.
     */
    raise(SIGHUP);
 
    // A long long wait so that we can easily issue a signal to this process
    while (run)
    {
        printf("running...\n");
        sleep(1); // sleep for 1 second
    }
 
    return 0;
}

Any insights or suggestions would be greatly appreciated!

[xdoardo]

Hello! Thanks for the report. We will take care of this after a planned refactor of important parts of our implementation of WASIX.