signal 2

#include <sys/types.h>#include <sys/socket.h>#include <netinet/in.h>#include <signal.h>#include <errno.h>#include <string.h>#include <stdio.h>#include <stdlib.h>#include <unistd.h>#include <pthread.h>volatile int alive = 1;void sigterm(int s) {    printf("%d: Sigterm received...\n", getpid());    alive = 0;    return;}void sigint(int s) {    printf("%d: Sigint received...\n", getpid());    alive = 0;    return;}void *client(void *sockvoid) {    int cfd = (int)sockvoid;    printf("Client thread started\n");    pthread_detach(pthread_self());    while(write(cfd, "Goodbye.\r\n", strlen("Goodbye.\r\n")) > 0)        usleep(500000);    printf("Shutting down child.\n");    shutdown(cfd, 2);    close(cfd);    pthread_exit(0);}void *start_loop(void *arg) {    struct sockaddr_in sa;    int sfd, tmp;        memset(&sa, 0, sizeof(sa));    sa.sin_family = AF_INET;        sfd = socket(AF_INET, SOCK_STREAM, 0);    bind(sfd, (struct sockaddr *)&sa, sizeof(sa));    listen(sfd, 20);        tmp = sizeof(sa);    getsockname(sfd, (struct sockaddr *)&sa, &tmp);    printf("Bound to: %d\n", ntohs(sa.sin_port));        while(alive) {        int cfd, socklen;        struct sockaddr_in csa;        pthread_t client_thread;                printf("Alive...\n");                socklen = sizeof(csa);        cfd = accept(sfd, (struct sockaddr *)&csa, &socklen);        printf("Accept received: %d\n", cfd);        if(cfd < 0) {            printf("Error return: %d with errno %d (%s)\n", cfd, errno, strerror(errno));        }        pthread_create(&client_thread, NULL, client, (void *)cfd);    }        printf("Done, alive cleared.\n");    close(sfd);        return NULL;}int main(int argc, char **argv) {    void *retval;    pthread_t child;    struct sigaction sig;        memset(&sig, 0, sizeof(sig));        sig.sa_handler = sigterm;    sigaction(SIGTERM, &sig, NULL);    sig.sa_handler = sigint;    sigaction(SIGINT, &sig, NULL);    printf("Creating child...\n");    pthread_create(&child, NULL, start_loop, NULL);    printf("Attaching to child...\n");    pthread_join(child, &retval);    printf("Child exited.\n");    exit(1);}