Actual source code: fhost.c

  1: #define PETSC_DLL
  2: /*
  3:       Code for manipulating files.
  4: */
 5:  #include petscsys.h
  6: #if defined(PETSC_HAVE_STDLIB_H)
  7: #include <stdlib.h>
  8: #endif
  9: #if defined(PETSC_HAVE_SYS_UTSNAME_H)
 10: #include <sys/utsname.h>
 11: #endif
 12: #if defined(PETSC_HAVE_WINDOWS_H)
 13: #include <windows.h>
 14: #endif
 15: #if defined(PETSC_HAVE_SYS_SYSTEMINFO_H)
 16: #include <sys/systeminfo.h>
 17: #endif
 18: #if defined(PETSC_HAVE_UNISTD_H)
 19: #include <unistd.h>
 20: #endif
 21: #if defined(PETSC_HAVE_NETDB_H)
 22: #include <netdb.h>
 23: #endif

 27: /*@C
 28:     PetscGetHostName - Returns the name of the host. This attempts to
 29:     return the entire Internet name. It may not return the same name
 30:     as MPI_Get_processor_name().

 32:     Not Collective

 34:     Input Parameter:
 35: .   nlen - length of name

 37:     Output Parameter:
 38: .   name - contains host name.  Must be long enough to hold the name
 39:            This is the fully qualified name, including the domain.

 41:     Level: developer

 43:     Concepts: machine name
 44:     Concepts: host name

 46: .seealso: PetscGetUserName()
 47: @*/
 48: PetscErrorCode  PetscGetHostName(char name[],size_t nlen)
 49: {
 50:   char           *domain;
 52:   PetscTruth     flag;
 53: #if defined(PETSC_HAVE_UNAME) && !defined(PETSC_HAVE_GETCOMPUTERNAME)
 54:   struct utsname utname;
 55: #endif

 58: #if defined(PETSC_HAVE_GETCOMPUTERNAME)
 59:  {
 60:     size_t nnlen = nlen;
 61:     GetComputerName((LPTSTR)name,(LPDWORD)(&nnlen));
 62:  }
 63: #elif defined(PETSC_HAVE_UNAME)
 64:   uname(&utname);
 65:   PetscStrncpy(name,utname.nodename,nlen);
 66: #elif defined(PETSC_HAVE_GETHOSTNAME)
 67:   gethostname(name,nlen);
 68: #elif defined(PETSC_HAVE_SYSINFO_3ARG)
 69:   sysinfo(SI_HOSTNAME,name,nlen);
 70: #endif
 71:   /* if there was not enough room then system call will not null terminate name */
 72:   name[nlen-1] = 0;

 74:   /* See if this name includes the domain */
 75:   PetscStrchr(name,'.',&domain);
 76:   if (!domain) {
 77:     size_t  l,ll;
 78:     PetscStrlen(name,&l);
 79:     if (l == nlen-1) return(0);
 80:     name[l++] = '.';
 81: #if defined(PETSC_HAVE_SYSINFO_3ARG)
 82:     sysinfo(SI_SRPC_DOMAIN,name+l,nlen-l);
 83: #elif defined(PETSC_HAVE_GETDOMAINNAME)
 84:     getdomainname(name+l,nlen - l);
 85: #endif
 86:     /* check if domain name is not a dnsdomainname and nuke it */
 87:     PetscStrlen(name,&ll);
 88:     if (ll > 4) {
 89:       PetscStrcmp(name + ll - 4,".edu",&flag);
 90:       if (!flag) {
 91:         PetscStrcmp(name + ll - 4,".com",&flag);
 92:         if (!flag) {
 93:           PetscStrcmp(name + ll - 4,".net",&flag);
 94:           if (!flag) {
 95:             PetscStrcmp(name + ll - 4,".org",&flag);
 96:             if (!flag) {
 97:               PetscStrcmp(name + ll - 4,".mil",&flag);
 98:               if (!flag) {
 99:                 PetscInfo1(0,"Rejecting domainname, likely is NIS %s\n",name);
100:                 name[l-1] = 0;
101:               }
102:             }
103:           }
104:         }
105:       }
106:     }
107:   }
108:   return(0);
109: }