Actual source code: fhost.c
petsc-3.7.1 2016-05-15
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      1: #define PETSC_DESIRE_FEATURE_TEST_MACROS /* for getdomainname */
      2: /*
      3:       Code for manipulating files.
      4: */
      5: #include <petscsys.h>
      6: #if defined(PETSC_HAVE_SYS_UTSNAME_H)
      7: #include <sys/utsname.h>
      8: #endif
      9: #if defined(PETSC_HAVE_WINDOWS_H)
     10: #include <windows.h>
     11: #endif
     12: #if defined(PETSC_HAVE_SYS_SYSTEMINFO_H)
     13: #include <sys/systeminfo.h>
     14: #endif
     15: #if defined(PETSC_HAVE_UNISTD_H)
     16: #include <unistd.h>
     17: #endif
     18: #if defined(PETSC_HAVE_NETDB_H)
     19: #include <netdb.h>
     20: #endif

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

     29:     Not Collective

     31:     Input Parameter:
     32: .   nlen - length of name

     34:     Output Parameter:
     35: .   name - contains host name.  Must be long enough to hold the name
     36:            This is the fully qualified name, including the domain.

     38:     Level: developer

     40:     Concepts: machine name
     41:     Concepts: host name

     43:    Fortran Version:
     44:    In Fortran this routine has the format

     46: $       character*(64) name
     47: $       call PetscGetHostName(name,ierr)

     49: .seealso: PetscGetUserName(),PetscGetArchType()
     50: @*/
     51: PetscErrorCode  PetscGetHostName(char name[],size_t nlen)
     52: {
     53:   char           *domain;
     55: #if defined(PETSC_HAVE_UNAME) && !defined(PETSC_HAVE_GETCOMPUTERNAME)
     56:   struct utsname utname;
     57: #endif

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

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