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/*@@
@file HostNames.c
@date Tue Nov 7 17:36:35 2000
@author Tom Goodale
@desc
Routines to collect data about all hosts in a Ccatus job.
@enddesc
@version $Header$
@@*/
#ifndef TEST_HOSTNAMES
#include "cctk.h"
#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif /* HAVE_UNISTD_H */
#ifdef HAVE_SYS_TIME_H
#include <sys/time.h>
#endif /* HAVE_SYS_TIME_H */
#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif /* HAVE_SYS_TYPES_H */
#ifdef HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif /* HAVE_SYS_SOCKET_H */
#ifdef HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif /* HAVE_NETINET_IN_H */
#ifdef HAVE_NETDB_H
#include <netdb.h>
#endif /* HAVE_NETDB_H */
#ifdef CCTK_MPI
#include "mpi.h"
#endif /* CCTK_MPI */
#include "httpextra_HostNames.h"
static char *rcsid = "$Header$";
#ifdef CCTK_FILEVERSION
CCTK_FILEVERSION(CactusConnect_HTTPDExtra_HostNames_c)
#endif
/********************************************************************
********************* Local Data Types ***********************
********************************************************************/
#define HOSTDATALENGTH 255
/********************************************************************
********************* Local Routine Prototypes *********************
********************************************************************/
static void GetHostName(char *name, int length);
/********************************************************************
********************* Other Routine Prototypes *********************
********************************************************************/
/********************************************************************
********************* Local Data *****************************
********************************************************************/
char *hostdata = NULL;
/********************************************************************
********************* External Routines **********************
********************************************************************/
/*@@
@routine HTTPDExtra_CollateHostData
@date Tue Nov 7 18:10:01 2000
@author Tom Goodale
@desc
Gets data about all hosts in the parallel job.
@enddesc
@calls
@calledby
@history
@endhistory
@@*/
void HTTPDExtra_CollateHostData(void)
{
int rank;
int nprocs;
char thisdata[HOSTDATALENGTH+1];
GetHostName(thisdata, HOSTDATALENGTH);
thisdata[HOSTDATALENGTH] = 0;
#ifdef CCTK_MPI
/* Work out how many processes there are. */
MPI_Comm_size(MPI_COMM_WORLD, &nprocs);
/* Work out if this is proc 0 or not. */
MPI_Comm_rank(MPI_COMM_WORLD, &rank);
#else
nprocs = 1;
rank = 0;
#endif
if(rank == 0)
{
hostdata=(char *)malloc((HOSTDATALENGTH+1)*nprocs);
if(!hostdata)
{
exit(999);
}
}
#ifdef CCTK_MPI
MPI_Gather(thisdata, HOSTDATALENGTH+1, MPI_BYTE,
hostdata, HOSTDATALENGTH+1, MPI_BYTE,
0, MPI_COMM_WORLD);
#else
strncpy(hostdata, thisdata, HOSTDATALENGTH);
#endif
}
/*@@
@routine HTTPDExtra_RemoteHostData
@date Tue Nov 7 18:10:38 2000
@author Tom Goodale
@desc
Gets name of a remote host indexed by host process number.
@enddesc
@calls
@calledby
@history
@endhistory
@@*/
const char *HTTPDExtra_RemoteHostName(int host)
{
return hostdata+host*(HOSTDATALENGTH+1);
}
/********************************************************************
********************* Local Routines *************************
********************************************************************/
/*@@
@routine GetHostName
@date Fri Oct 20 12:12:34 2000
@author Tom Goodale
@desc
Gets the fully qualified name of this host if possible.
@enddesc
@calls
@calledby
@history
@endhistory
@var name
@vdesc character buffer to store name in
@vtype char *
@vio out
@vcomment
@endvar
@var length
@vdesc length of the character buffer
@vtype int
@vio in
@vcomment
@endvar
@@*/
static void GetHostName(char *name, int length)
{
gethostname(name, length);
/* Does the name include the domain. */
if(!strchr(name, '.'))
{
#ifdef HAVE_GETHOSTBYNAME
struct hostent *thishostent;
thishostent = gethostbyname(name);
strncpy(name, thishostent->h_name, length);
#endif
}
}
#ifdef TEST_HOSTNAMES
int main(int argc, char *argv[])
{
int rank;
int nprocs;
#ifdef CCTK_MPI
MPI_Init(&argc, &argv);
/* Work out how many processes there are. */
MPI_Comm_size(MPI_COMM_WORLD, &nprocs);
/* Work out if this is proc 0 or not. */
MPI_Comm_rank(MPI_COMM_WORLD, &rank);
#else
nprocs = 1;
rank = 0;
#endif
HTTPDExtra_CollateHostData();
if(rank == 0)
{
for(rank = 0; rank < nprocs; rank++)
{
printf("Host %d is %s\n", rank, HTTPDExtra_RemoteHostName(rank));
}
}
#ifdef CCTK_MPI
MPI_Finalize();
#endif
return 0;
}
#endif /* TESTHOSTNAMES */
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