Dump core if SIGSEGV (in C)?

How can I dump the core when my program receives the SIGSEGV signal ? (The server that runs my program has very limited permissions and therefore core dump is disabled by default.)

I have written the following using gcore but I would like to use C functions instead. Can I som开发者_JAVA技巧ehow catch the core and write it to a folder somewhere ?

void segfaulthandler(int parameter)
{
    char gcore[50];
    sprintf(gcore, "gcore -s -c \"core\" %u", getpid());
    system(gcore);

    exit(1);
}

int main(void)
{
    signal(SIGSEGV, segfaulthandler);
}

Unless there's a hard limit preventing you, you could use setrlimit(RLIMIT_CORE, ...) to increase the softlimit and enable coredumps - this corresponds to running ulimit -c in shell.

On linux, you typically can do:

$ ulimit -c unlimited

The resulting core file will be written in the current working directory of the process when the signal is received.