1 2 #include <petscsys.h> 3 #include <stdarg.h> 4 #if defined(PETSC_HAVE_STDLIB_H) 5 #include <stdlib.h> 6 #endif 7 8 #undef __FUNCT__ 9 #define __FUNCT__ "PetscOptionsGetenv" 10 /*@C 11 PetscOptionsGetenv - Gets an environmental variable, broadcasts to all 12 processors in communicator from first. 13 14 Collective on MPI_Comm 15 16 Input Parameters: 17 + comm - communicator to share variable 18 . name - name of environmental variable 19 - len - amount of space allocated to hold variable 20 21 Output Parameters: 22 + flag - if not PETSC_NULL tells if variable found or not 23 - env - value of variable 24 25 Level: advanced 26 27 Notes: 28 You can also "set" the environmental variable by setting the options database value 29 -name "stringvalue" (with name in lower case). If name begins with PETSC_ this is 30 discarded before checking the database. For example, PETSC_VIEWER_SOCKET_PORT would 31 be given as -viewer_socket_port 9000 32 33 If comm does not contain the 0th process in the MPIEXEC it is likely on 34 many systems that the environmental variable will not be set unless you 35 put it in a universal location like a .chsrc file 36 37 @*/ 38 PetscErrorCode PetscOptionsGetenv(MPI_Comm comm,const char name[],char env[],size_t len,PetscBool *flag) 39 { 40 PetscErrorCode ierr; 41 PetscMPIInt rank; 42 char *str,work[256]; 43 PetscBool flg = PETSC_FALSE,spetsc; 44 45 PetscFunctionBegin; 46 47 /* first check options database */ 48 ierr = PetscStrncmp(name,"PETSC_",6,&spetsc);CHKERRQ(ierr); 49 50 ierr = PetscStrcpy(work,"-");CHKERRQ(ierr); 51 if (spetsc) { 52 ierr = PetscStrcat(work,name+6);CHKERRQ(ierr); 53 } else { 54 ierr = PetscStrcat(work,name);CHKERRQ(ierr); 55 } 56 ierr = PetscStrtolower(work);CHKERRQ(ierr); 57 if (env) { 58 ierr = PetscOptionsGetString(PETSC_NULL,work,env,len,&flg);CHKERRQ(ierr); 59 if (flg) { 60 if (flag) *flag = PETSC_TRUE; 61 } else { /* now check environment */ 62 ierr = PetscMemzero(env,len*sizeof(char));CHKERRQ(ierr); 63 64 ierr = MPI_Comm_rank(comm,&rank);CHKERRQ(ierr); 65 if (!rank) { 66 str = getenv(name); 67 if (str) flg = PETSC_TRUE; 68 if (str && env) {ierr = PetscStrncpy(env,str,len);CHKERRQ(ierr);} 69 } 70 ierr = MPI_Bcast(&flg,1,MPIU_BOOL,0,comm);CHKERRQ(ierr); 71 ierr = MPI_Bcast(env,len,MPI_CHAR,0,comm);CHKERRQ(ierr); 72 if (flag) *flag = flg; 73 } 74 } else { 75 ierr = PetscOptionsHasName(PETSC_NULL,work,flag);CHKERRQ(ierr); 76 } 77 PetscFunctionReturn(0); 78 } 79 80 /* 81 PetscSetDisplay - Tries to set the X windows display variable for all processors. 82 The variable PetscDisplay contains the X windows display variable. 83 84 */ 85 static char PetscDisplay[256]; 86 87 #undef __FUNCT__ 88 #define __FUNCT__ "PetscWorldIsSingleHost" 89 static PetscErrorCode PetscWorldIsSingleHost(PetscBool *onehost) 90 { 91 PetscErrorCode ierr; 92 char hostname[256],roothostname[256]; 93 PetscMPIInt localmatch,allmatch; 94 PetscBool flag; 95 96 PetscFunctionBegin; 97 ierr = PetscGetHostName(hostname,256);CHKERRQ(ierr); 98 ierr = PetscMemcpy(roothostname,hostname,256);CHKERRQ(ierr); 99 ierr = MPI_Bcast(roothostname,256,MPI_CHAR,0,PETSC_COMM_WORLD);CHKERRQ(ierr); 100 ierr = PetscStrcmp(hostname,roothostname,&flag);CHKERRQ(ierr); 101 localmatch = (PetscMPIInt)flag; 102 ierr = MPI_Allreduce(&localmatch,&allmatch,1,MPI_INT,MPI_LAND,PETSC_COMM_WORLD);CHKERRQ(ierr); 103 *onehost = (PetscBool)allmatch; 104 PetscFunctionReturn(0); 105 } 106 107 108 #undef __FUNCT__ 109 #define __FUNCT__ "PetscSetDisplay" 110 PetscErrorCode PetscSetDisplay(void) 111 { 112 PetscErrorCode ierr; 113 PetscMPIInt size,rank; 114 PetscBool flag,singlehost=PETSC_FALSE; 115 char display[sizeof(PetscDisplay)]; 116 const char *str; 117 118 PetscFunctionBegin; 119 ierr = PetscOptionsGetString(PETSC_NULL,"-display",PetscDisplay,sizeof(PetscDisplay),&flag);CHKERRQ(ierr); 120 if (flag) PetscFunctionReturn(0); 121 122 ierr = MPI_Comm_size(PETSC_COMM_WORLD,&size);CHKERRQ(ierr); 123 ierr = MPI_Comm_rank(PETSC_COMM_WORLD,&rank);CHKERRQ(ierr); 124 125 ierr = PetscWorldIsSingleHost(&singlehost);CHKERRQ(ierr); 126 127 str = getenv("DISPLAY"); 128 if (!str) str = ":0.0"; 129 if (str[0] != ':' || singlehost) { 130 ierr = PetscStrncpy(display,str,sizeof(display));CHKERRQ(ierr); 131 } else { 132 if (!rank) { 133 size_t len; 134 ierr = PetscGetHostName(display,sizeof(display));CHKERRQ(ierr); 135 ierr = PetscStrlen(display,&len);CHKERRQ(ierr); 136 ierr = PetscStrncat(display,str,sizeof(display)-len-1);CHKERRQ(ierr); 137 } 138 } 139 ierr = MPI_Bcast(display,sizeof(display),MPI_CHAR,0,PETSC_COMM_WORLD);CHKERRQ(ierr); 140 ierr = PetscMemcpy(PetscDisplay,display,sizeof(PetscDisplay));CHKERRQ(ierr); 141 PetscDisplay[sizeof(PetscDisplay)-1] = 0; 142 PetscFunctionReturn(0); 143 } 144 145 #undef __FUNCT__ 146 #define __FUNCT__ "PetscGetDisplay" 147 /* 148 PetscGetDisplay - Gets the display variable for all processors. 149 150 Input Parameters: 151 . n - length of string display 152 153 Output Parameters: 154 . display - the display string 155 156 */ 157 PetscErrorCode PetscGetDisplay(char display[],size_t n) 158 { 159 PetscErrorCode ierr; 160 161 PetscFunctionBegin; 162 ierr = PetscStrncpy(display,PetscDisplay,n);CHKERRQ(ierr); 163 PetscFunctionReturn(0); 164 } 165