Thread: sending variables to a signal function

  1. #1
    Registered User
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    Post sending variables to a signal function

    hello

    im trying to print on one process something that its on the shared memory so when i create a player in another process i send to the "Server" a signal and it supposed to print something like -Player "name" joined...

    where name is something in the shared memory

    so this function its executed when server recieve the signal
    Code:
    //Signal sended from other process "player.c"
    //function in main "server.c"
    
    void signal_new_player(int mysignal){
          printf("Player: \n");
    }
    
    and in main:
    
    signal(SIGTERM, signal_new_player);
    so i was wondering if is possible to make the function something like this:

    Code:
    void signal_new_player(int mysignal, player *shm){
          printf("Jugador: %d joined....\n", shm[0]);
    }
    i mean, send more parameters (char, int, arrays, pointers, etc) to the function that is executed when the signals arrive.

    thanks in advice!!
    OVNYX

  2. #2
    and the hat of int overfl Salem's Avatar
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    signal(2) - Linux manual page

    Read the notes.
    1. The effects of signal() in a multithreaded process are unspecified.
    2. printf() isn't in signal-safety(7) - Linux manual page
    3. You can't invent parameters received by signals.
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.

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