sigchild handling problem

Hi All,

Can someone let me know what is the problem with this progam. When a sigchild is generated, 1. Why does wait3 returns an error and fails to find a process which has exited normally 2. The program dumps core in main function after the sigchild has been handled.

Regards, Anup Mahansaria

pidt pro;

void anup();

void anup1() { printf("Inside the sigchalid handler olalalala-n");

}

extern "C" void sigChildHandler(int signo) { printf("Inside the sigchalid handler-n"); anup1 (); anup ();

}

void anup () { int status=0; int *statusp; int options; struct rusage *usage; pidt pid;

printf("I am there at desired place"); options = WNOHANG WUNTRACED; { sleep (10);

int j = WIFSIGNALED(*statusp); printf("-n-n-nsignal status is: %d-n", j);

int i = WIFEXITED(*statusp); { printf("exit status is: %d-n", i); } else { printf("-n-n-n-n In the else partHope things works like this-n"); printf("-n-n-nexit status is: %d", i); }

if (pro == pid) { printf("-n-n-n-nProcess id: %d : %d-n",pro,pid); } else printf("-n-n-n-nProcess id: %d : %d-n",pro,pid); }

printf ("-nafter while-n"); -sleep (10); printf ("-nafter sleep-n"); -signal(SIGCHLD, sigChildHandler);

}

extern "C" void sigHandler(int signo) { printf("Inside the sighandler-n");

}

int main (int argc, char** argv, char** argp) { pidt selfprocessidm = getpid();

signal(SIGCHLD, sigChildHandler);

sigsett signalSet; struct sigaction sigchildaction;

sigfillset(&signalSet); sigdelset(&signalSet, SIGHUP); sigdelset(&signalSet, SIGINT); sigdelset(&signalSet, SIGCHLD); sigprocmask(SIGSETMASK, &signalSet, NULL);

sigchildaction.sasigaction = NULL; sigemptyset(&sigchildaction.samask); sigaddset(&sigchildaction.samask, SIGHUP); sigaddset(&sigchildaction.samask, SIGINT); sigaddset(&sigchildaction.samask, SIGCHLD); -sigchildaction.saflags =(SANOCLDSTOP); sigchildaction.sahandler = sigHandler; sigaction(SIGHUP, &sigchildaction, NULL); sigaction(SIGINT, &sigchildaction, NULL); sigchildaction.sahandler = sigChildHandler; sigaction(SIGCHLD, &sigchildaction, NULL);

pro = fork ();

if (0 == pro) { printf("problem is resolved-n");

sigsett sigset;

sigemptyset(&sigset); sigaddset(&sigset, SIGUSR1); sigaddset(&sigset, SIGUSR2); sigprocmask(SIGBLOCK, &sigset, NULL);

setsid();

if (-1 == execve ("th", argv, argp)) { printf("failed to fork the process"); exit (-1); } else { printf("-n-nprocess forrked successfully-n-n"); exit (0); }

}

printf("-n-nInside the main function-n-n"); sleep (100); int i; scanf("%d",&i); printf("-n-nAfter the sleep....let see if it is thereInside the main function-n-n"); return 0;