#!/bin/bash                                                                           
#SBATCH -p IFIall # partition (queue)                                                 
#SBATCH --nodes 8 # number of nodes                                                   
#SBATCH --cores 1 # number of cores                                                   
#SBATCH --ntasks-per-node=1                                                           
#SBATCH --account=dbis                                                                
#SBATCH --mem 100 # memory pool for all cores                                         
#SBATCH -t 0-2:00 # time (D-HH:MM)                                                    
#SBATCH -o slurm.%N.%j.out # STDOUT                                                   
#SBATCH -e slurm.%N.%j.err # STDERR                                                   

/bin/cat <<EOM> sample.c                                                              
// C program to display hostname                                                      
// and IP address                                                                     
#include <stdio.h>                                                                    
#include <stdlib.h>                                                                   
#include <unistd.h>                                                                   
#include <errno.h>                                                                    
#include <netdb.h>                                                                    
#include <sys/types.h>                                                                
#include <sys/socket.h>                                                               
#include <netinet/in.h>                                                               
#include <arpa/inet.h>                                                                
                                                                                      
// Returns hostname for the local computer                                            
void checkHostName(int hostname)                                                      
{
    if (hostname == -1)
    {
        perror("gethostname");
        exit(1);
    }
}

// Returns host information corresponding to host name                                
void checkHostEntry(struct hostent * hostentry)                                       
{                                                                                     
    if (hostentry == NULL)
    {
        perror("gethostbyname");
        exit(1);
    }
}

// Converts space-delimited IPv4 addresses                                           
// to dotted-decimal format
void checkIPbuffer(char *IPbuffer)
{
    if (NULL == IPbuffer)
    {
        perror("inet_ntoa");
        exit(1);
    }
}

// Driver code
int main()
{
    char hostbuffer[256];
    char *IPbuffer;
    struct hostent *host_entry;
    int hostname;

    // To retrieve hostname
    hostname = gethostname(hostbuffer, sizeof(hostbuffer));                          
    checkHostName(hostname);

    // To retrieve host information
    host_entry = gethostbyname(hostbuffer);                                          
    checkHostEntry(host_entry);

    // To convert an Internet network
    // address into ASCII string
    IPbuffer = inet_ntoa(*((struct in_addr*)                                         
                           host_entry->h_addr_list[0]));                             

    printf("Hostname: %s\n", hostbuffer);
    printf("Host IP: %s\n", IPbuffer);

    return 0;
}
EOM

gcc -o sample sample.c
srun sample