1 2 #include <petscsys.h> 3 #include <errno.h> 4 #if defined(PETSC_HAVE_PWD_H) 5 #include <pwd.h> 6 #endif 7 #include <ctype.h> 8 #include <sys/stat.h> 9 #if defined(PETSC_HAVE_UNISTD_H) 10 #include <unistd.h> 11 #endif 12 #if defined(PETSC_HAVE_SYS_UTSNAME_H) 13 #include <sys/utsname.h> 14 #endif 15 #if defined(PETSC_HAVE_IO_H) 16 #include <io.h> 17 #endif 18 #if defined(PETSC_HAVE_SYS_SYSTEMINFO_H) 19 #include <sys/systeminfo.h> 20 #endif 21 22 #if defined(PETSC_HAVE__ACCESS) || defined(PETSC_HAVE_ACCESS) 23 24 #undef __FUNCT__ 25 #define __FUNCT__ "PetscTestOwnership" 26 static PetscErrorCode PetscTestOwnership(const char fname[], char mode, uid_t fuid, gid_t fgid, int fmode, PetscBool *flg) 27 { 28 int m = R_OK; 29 PetscErrorCode ierr; 30 31 PetscFunctionBegin; 32 if (mode == 'r') m = R_OK; 33 else if (mode == 'w') m = W_OK; 34 else if (mode == 'x') m = X_OK; 35 else SETERRQ(PETSC_COMM_SELF,PETSC_ERR_ARG_WRONG, "Mode must be one of r, w, or x"); 36 #if defined(PETSC_HAVE_ACCESS) 37 if (!access(fname, m)) { 38 ierr = PetscInfo1(NULL,"System call access() succeeded on file %s\n",fname);CHKERRQ(ierr); 39 *flg = PETSC_TRUE; 40 } else { 41 ierr = PetscInfo1(NULL,"System call access() failed on file %s\n",fname);CHKERRQ(ierr); 42 *flg = PETSC_FALSE; 43 } 44 #else 45 if (m == X_OK) SETERRQ1(PETSC_COMM_SELF,PETSC_ERR_SUP, "Unable to check execute permission for file %s", fname); 46 if (!_access(fname, m)) *flg = PETSC_TRUE; 47 #endif 48 PetscFunctionReturn(0); 49 } 50 51 #else /* PETSC_HAVE_ACCESS or PETSC_HAVE__ACCESS */ 52 53 #undef __FUNCT__ 54 #define __FUNCT__ "PetscTestOwnership" 55 static PetscErrorCode PetscTestOwnership(const char fname[], char mode, uid_t fuid, gid_t fgid, int fmode, PetscBool *flg) 56 { 57 uid_t uid; 58 gid_t *gid = NULL; 59 int numGroups; 60 int rbit = S_IROTH; 61 int wbit = S_IWOTH; 62 int ebit = S_IXOTH; 63 PetscErrorCode ierr; 64 65 PetscFunctionBegin; 66 /* Get the number of supplementary group IDs */ 67 #if !defined(PETSC_MISSING_GETGROUPS) 68 numGroups = getgroups(0, gid); if (numGroups < 0) SETERRQ(PETSC_COMM_SELF,numGroups, "Unable to count supplementary group IDs"); 69 ierr = PetscMalloc1(numGroups+1, &gid);CHKERRQ(ierr); 70 #else 71 numGroups = 0; 72 #endif 73 74 /* Get the (effective) user and group of the caller */ 75 uid = geteuid(); 76 gid[0] = getegid(); 77 78 /* Get supplementary group IDs */ 79 #if !defined(PETSC_MISSING_GETGROUPS) 80 ierr = getgroups(numGroups, gid+1); if (ierr < 0) SETERRQ(PETSC_COMM_SELF,ierr, "Unable to obtain supplementary group IDs"); 81 #endif 82 83 /* Test for accessibility */ 84 if (fuid == uid) { 85 rbit = S_IRUSR; 86 wbit = S_IWUSR; 87 ebit = S_IXUSR; 88 } else { 89 int g; 90 91 for (g = 0; g <= numGroups; g++) { 92 if (fgid == gid[g]) { 93 rbit = S_IRGRP; 94 wbit = S_IWGRP; 95 ebit = S_IXGRP; 96 break; 97 } 98 } 99 } 100 ierr = PetscFree(gid);CHKERRQ(ierr); 101 102 if (mode == 'r') { 103 if (fmode & rbit) *flg = PETSC_TRUE; 104 } else if (mode == 'w') { 105 if (fmode & wbit) *flg = PETSC_TRUE; 106 } else if (mode == 'x') { 107 if (fmode & ebit) *flg = PETSC_TRUE; 108 } 109 PetscFunctionReturn(0); 110 } 111 112 #endif /* PETSC_HAVE_ACCESS */ 113 114 #undef __FUNCT__ 115 #define __FUNCT__ "PetscGetFileStat" 116 static PetscErrorCode PetscGetFileStat(const char fname[], uid_t *fileUid, gid_t *fileGid, int *fileMode,PetscBool *exists) 117 { 118 struct stat statbuf; 119 PetscErrorCode ierr; 120 121 PetscFunctionBegin; 122 *fileMode = 0; 123 *exists = PETSC_FALSE; 124 #if defined(PETSC_HAVE_STAT_NO_CONST) 125 ierr = stat((char*) fname, &statbuf); 126 #else 127 ierr = stat(fname, &statbuf); 128 #endif 129 if (ierr) { 130 #if defined(EOVERFLOW) 131 if (errno == EOVERFLOW) SETERRQ(PETSC_COMM_SELF,PETSC_ERR_SYS,"EOVERFLOW in stat(), configure PETSc --with-large-file-io=1 to support files larger than 2GiB"); 132 #endif 133 ierr = PetscInfo1(NULL,"System call stat() failed on file %s\n",fname);CHKERRQ(ierr); 134 *exists = PETSC_FALSE; 135 } else { 136 ierr = PetscInfo1(NULL,"System call stat() succeeded on file %s\n",fname);CHKERRQ(ierr); 137 *exists = PETSC_TRUE; 138 *fileUid = statbuf.st_uid; 139 *fileGid = statbuf.st_gid; 140 *fileMode = statbuf.st_mode; 141 } 142 PetscFunctionReturn(0); 143 } 144 145 #undef __FUNCT__ 146 #define __FUNCT__ "PetscTestFile" 147 /*@C 148 PetscTestFile - checks for the existence of a file 149 150 Not Collective 151 152 Input Parameter: 153 + fname - the filename 154 - mode - either 'r', 'w', or 'x' 155 156 Output Parameter: 157 . flg - the file exists and satisfies the mode 158 159 .seealso: PetscTestDirectory(), PetscLs() 160 @*/ 161 PetscErrorCode PetscTestFile(const char fname[], char mode, PetscBool *flg) 162 { 163 uid_t fuid; 164 gid_t fgid; 165 int fmode; 166 PetscErrorCode ierr; 167 PetscBool exists; 168 169 PetscFunctionBegin; 170 *flg = PETSC_FALSE; 171 if (!fname) PetscFunctionReturn(0); 172 173 ierr = PetscGetFileStat(fname, &fuid, &fgid, &fmode,&exists);CHKERRQ(ierr); 174 if (!exists) PetscFunctionReturn(0); 175 /* Except for systems that have this broken stat macros (rare), this is the correct way to check for a regular file */ 176 if (!S_ISREG(fmode)) PetscFunctionReturn(0); 177 178 ierr = PetscTestOwnership(fname, mode, fuid, fgid, fmode, flg);CHKERRQ(ierr); 179 PetscFunctionReturn(0); 180 } 181 182 #undef __FUNCT__ 183 #define __FUNCT__ "PetscTestDirectory" 184 /*@C 185 PetscTestDirectory - checks for the existence of a directory 186 187 Not Collective 188 189 Input Parameter: 190 + dirname - the directory name 191 - mode - either 'r', 'w', or 'x' 192 193 Output Parameter: 194 . flg - the directory exists and satisfies the mode 195 196 .seealso: PetscTestFile(), PetscLs() 197 @*/ 198 PetscErrorCode PetscTestDirectory(const char dirname[],char mode,PetscBool *flg) 199 { 200 uid_t fuid; 201 gid_t fgid; 202 int fmode; 203 PetscErrorCode ierr; 204 PetscBool exists; 205 206 PetscFunctionBegin; 207 *flg = PETSC_FALSE; 208 if (!dirname) PetscFunctionReturn(0); 209 210 ierr = PetscGetFileStat(dirname, &fuid, &fgid, &fmode,&exists);CHKERRQ(ierr); 211 if (!exists) PetscFunctionReturn(0); 212 /* Except for systems that have this broken stat macros (rare), this 213 is the correct way to check for a directory */ 214 if (!S_ISDIR(fmode)) PetscFunctionReturn(0); 215 216 ierr = PetscTestOwnership(dirname, mode, fuid, fgid, fmode, flg);CHKERRQ(ierr); 217 PetscFunctionReturn(0); 218 } 219 220 #undef __FUNCT__ 221 #define __FUNCT__ "PetscLs" 222 /*@C 223 PetscLs - produce a listing of the files in a directory 224 225 Collective on MPI_Comm 226 227 Input Parameter: 228 + comm - the MPI communicator 229 . dirname - the directory name 230 - tlen - the length of the buffer found[] 231 232 Output Parameter: 233 + found - listing of files 234 - flg - the directory exists 235 236 .seealso: PetscTestFile(), PetscLs() 237 @*/ 238 PetscErrorCode PetscLs(MPI_Comm comm,const char dirname[],char found[],size_t tlen,PetscBool *flg) 239 { 240 PetscErrorCode ierr; 241 size_t len; 242 char *f,program[PETSC_MAX_PATH_LEN]; 243 FILE *fp; 244 245 PetscFunctionBegin; 246 ierr = PetscStrcpy(program,"ls ");CHKERRQ(ierr); 247 ierr = PetscStrcat(program,dirname);CHKERRQ(ierr); 248 #if defined(PETSC_HAVE_POPEN) 249 ierr = PetscPOpen(comm,NULL,program,"r",&fp);CHKERRQ(ierr); 250 #else 251 SETERRQ(PETSC_COMM_SELF,PETSC_ERR_SUP_SYS,"Cannot run external programs on this machine"); 252 #endif 253 f = fgets(found,tlen,fp); 254 if (f) *flg = PETSC_TRUE; 255 else *flg = PETSC_FALSE; 256 while (f) { 257 ierr = PetscStrlen(found,&len);CHKERRQ(ierr); 258 f = fgets(found+len,tlen-len,fp); 259 } 260 if (*flg) {ierr = PetscInfo2(0,"ls on %s gives \n%s\n",dirname,found);CHKERRQ(ierr);} 261 #if defined(PETSC_HAVE_POPEN) 262 ierr = PetscPClose(comm,fp,NULL);CHKERRQ(ierr); 263 #else 264 SETERRQ(PETSC_COMM_SELF,PETSC_ERR_SUP_SYS,"Cannot run external programs on this machine"); 265 #endif 266 PetscFunctionReturn(0); 267 } 268