1 #define PETSC_DLL 2 3 #include "petscsys.h" 4 #include <stdarg.h> 5 #if defined(PETSC_HAVE_STDLIB_H) 6 #include <stdlib.h> 7 #endif 8 9 #undef __FUNCT__ 10 #define __FUNCT__ "PetscOptionsGetenv" 11 /*@C 12 PetscOptionsGetenv - Gets an environmental variable, broadcasts to all 13 processors in communicator from first. 14 15 Collective on MPI_Comm 16 17 Input Parameters: 18 + comm - communicator to share variable 19 . name - name of environmental variable 20 - len - amount of space allocated to hold variable 21 22 Output Parameters: 23 + flag - if not PETSC_NULL tells if variable found or not 24 - env - value of variable 25 26 Level: advanced 27 28 Notes: 29 You can also "set" the environmental variable by setting the options database value 30 -name "stringvalue" (with name in lower case). If name begins with PETSC_ this is 31 discarded before checking the database. For example, PETSC_VIEWER_SOCKET_PORT would 32 be given as -viewer_socket_port 9000 33 34 If comm does not contain the 0th process in the MPIEXEC it is likely on 35 many systems that the environmental variable will not be set unless you 36 put it in a universal location like a .chsrc file 37 38 @*/ 39 PetscErrorCode PETSC_DLLEXPORT PetscOptionsGetenv(MPI_Comm comm,const char name[],char env[],size_t len,PetscTruth *flag) 40 { 41 PetscErrorCode ierr; 42 PetscMPIInt rank; 43 char *str,work[256]; 44 PetscTruth flg = PETSC_FALSE,spetsc; 45 46 PetscFunctionBegin; 47 48 /* first check options database */ 49 ierr = PetscStrncmp(name,"PETSC_",6,&spetsc);CHKERRQ(ierr); 50 51 ierr = PetscStrcpy(work,"-");CHKERRQ(ierr); 52 if (spetsc) { 53 ierr = PetscStrcat(work,name+6);CHKERRQ(ierr); 54 } else { 55 ierr = PetscStrcat(work,name);CHKERRQ(ierr); 56 } 57 ierr = PetscStrtolower(work);CHKERRQ(ierr); 58 if (env) { 59 ierr = PetscOptionsGetString(PETSC_NULL,work,env,len,&flg);CHKERRQ(ierr); 60 if (flg) { 61 if (flag) *flag = PETSC_TRUE; 62 } else { /* now check environment */ 63 ierr = PetscMemzero(env,len*sizeof(char));CHKERRQ(ierr); 64 65 ierr = MPI_Comm_rank(comm,&rank);CHKERRQ(ierr); 66 if (!rank) { 67 str = getenv(name); 68 if (str) flg = PETSC_TRUE; 69 if (str && env) {ierr = PetscStrncpy(env,str,len);CHKERRQ(ierr);} 70 } 71 ierr = MPI_Bcast(&flg,1,MPI_INT,0,comm);CHKERRQ(ierr); 72 ierr = MPI_Bcast(env,len,MPI_CHAR,0,comm);CHKERRQ(ierr); 73 if (flag) *flag = flg; 74 } 75 } else { 76 ierr = PetscOptionsHasName(PETSC_NULL,work,flag);CHKERRQ(ierr); 77 } 78 PetscFunctionReturn(0); 79 } 80 81 /* 82 PetscSetDisplay - Tries to set the X windows display variable for all processors. 83 The variable PetscDisplay contains the X windows display variable. 84 85 */ 86 static char PetscDisplay[256]; 87 88 #undef __FUNCT__ 89 #define __FUNCT__ "PetscSetDisplay" 90 PetscErrorCode PETSC_DLLEXPORT PetscSetDisplay(void) 91 { 92 PetscErrorCode ierr; 93 PetscMPIInt size,rank; 94 PetscTruth flag; 95 char *str,display[256]; 96 97 PetscFunctionBegin; 98 ierr = PetscMemzero(display,256*sizeof(char));CHKERRQ(ierr); 99 ierr = PetscOptionsGetString(PETSC_NULL,"-display",PetscDisplay,256,&flag);CHKERRQ(ierr); 100 if (flag) PetscFunctionReturn(0); 101 102 ierr = MPI_Comm_size(PETSC_COMM_WORLD,&size);CHKERRQ(ierr); 103 ierr = MPI_Comm_rank(PETSC_COMM_WORLD,&rank);CHKERRQ(ierr); 104 if (!rank) { 105 str = getenv("DISPLAY"); 106 if (!str || (str[0] == ':' && size > 1)) { 107 ierr = PetscGetHostName(display,255);CHKERRQ(ierr); 108 ierr = PetscStrcat(display,":0.0");CHKERRQ(ierr); 109 } else { 110 ierr = PetscStrncpy(display,str,256);CHKERRQ(ierr); 111 } 112 } 113 ierr = MPI_Bcast(display,256,MPI_CHAR,0,PETSC_COMM_WORLD);CHKERRQ(ierr); 114 if (rank) { 115 str = getenv("DISPLAY"); 116 /* assume that ssh port forwarding is working */ 117 if (str && (str[0] != ':')) { 118 ierr = PetscStrcpy(display,str);CHKERRQ(ierr); 119 } 120 } 121 ierr = PetscStrcpy(PetscDisplay,display);CHKERRQ(ierr); 122 PetscFunctionReturn(0); 123 } 124 125 #undef __FUNCT__ 126 #define __FUNCT__ "PetscGetDisplay" 127 /* 128 PetscGetDisplay - Gets the display variable for all processors. 129 130 Input Parameters: 131 . n - length of string display 132 133 Output Parameters: 134 . display - the display string 135 136 */ 137 PetscErrorCode PETSC_DLLEXPORT PetscGetDisplay(char display[],size_t n) 138 { 139 PetscErrorCode ierr; 140 141 PetscFunctionBegin; 142 ierr = PetscStrncpy(display,PetscDisplay,n);CHKERRQ(ierr); 143 PetscFunctionReturn(0); 144 } 145