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 static PetscErrorCode PetscTestOwnership(const char fname[], char mode, uid_t fuid, gid_t fgid, int fmode, PetscBool *flg) 25 { 26 int m = R_OK; 27 PetscErrorCode ierr; 28 29 PetscFunctionBegin; 30 if (mode == 'r') m = R_OK; 31 else if (mode == 'w') m = W_OK; 32 else if (mode == 'x') m = X_OK; 33 else SETERRQ(PETSC_COMM_SELF,PETSC_ERR_ARG_WRONG, "Mode must be one of r, w, or x"); 34 #if defined(PETSC_HAVE_ACCESS) 35 if (!access(fname, m)) { 36 ierr = PetscInfo1(NULL,"System call access() succeeded on file %s\n",fname);CHKERRQ(ierr); 37 *flg = PETSC_TRUE; 38 } else { 39 ierr = PetscInfo1(NULL,"System call access() failed on file %s\n",fname);CHKERRQ(ierr); 40 *flg = PETSC_FALSE; 41 } 42 #else 43 if (m == X_OK) SETERRQ1(PETSC_COMM_SELF,PETSC_ERR_SUP, "Unable to check execute permission for file %s", fname); 44 if (!_access(fname, m)) *flg = PETSC_TRUE; 45 #endif 46 PetscFunctionReturn(0); 47 } 48 49 #else /* PETSC_HAVE_ACCESS or PETSC_HAVE__ACCESS */ 50 51 static PetscErrorCode PetscTestOwnership(const char fname[], char mode, uid_t fuid, gid_t fgid, int fmode, PetscBool *flg) 52 { 53 uid_t uid; 54 gid_t *gid = NULL; 55 int numGroups; 56 int rbit = S_IROTH; 57 int wbit = S_IWOTH; 58 int ebit = S_IXOTH; 59 PetscErrorCode ierr; 60 #if !defined(PETSC_MISSING_GETGROUPS) 61 int err; 62 #endif 63 64 PetscFunctionBegin; 65 /* Get the number of supplementary group IDs */ 66 #if !defined(PETSC_MISSING_GETGROUPS) 67 numGroups = getgroups(0, gid); if (numGroups < 0) SETERRQ(PETSC_COMM_SELF,PETSC_ERR_SYS, "Unable to count supplementary group IDs"); 68 ierr = PetscMalloc1(numGroups+1, &gid);CHKERRQ(ierr); 69 #else 70 numGroups = 0; 71 #endif 72 73 /* Get the (effective) user and group of the caller */ 74 uid = geteuid(); 75 gid[0] = getegid(); 76 77 /* Get supplementary group IDs */ 78 #if !defined(PETSC_MISSING_GETGROUPS) 79 err = getgroups(numGroups, gid+1); if (err < 0) SETERRQ(PETSC_COMM_SELF,PETSC_ERR_SYS, "Unable to obtain supplementary group IDs"); 80 #endif 81 82 /* Test for accessibility */ 83 if (fuid == uid) { 84 rbit = S_IRUSR; 85 wbit = S_IWUSR; 86 ebit = S_IXUSR; 87 } else { 88 int g; 89 90 for (g = 0; g <= numGroups; g++) { 91 if (fgid == gid[g]) { 92 rbit = S_IRGRP; 93 wbit = S_IWGRP; 94 ebit = S_IXGRP; 95 break; 96 } 97 } 98 } 99 ierr = PetscFree(gid);CHKERRQ(ierr); 100 101 if (mode == 'r') { 102 if (fmode & rbit) *flg = PETSC_TRUE; 103 } else if (mode == 'w') { 104 if (fmode & wbit) *flg = PETSC_TRUE; 105 } else if (mode == 'x') { 106 if (fmode & ebit) *flg = PETSC_TRUE; 107 } 108 PetscFunctionReturn(0); 109 } 110 111 #endif /* PETSC_HAVE_ACCESS */ 112 113 static PetscErrorCode PetscGetFileStat(const char fname[], uid_t *fileUid, gid_t *fileGid, int *fileMode,PetscBool *exists) 114 { 115 struct stat statbuf; 116 PetscErrorCode ierr; 117 118 PetscFunctionBegin; 119 *fileMode = 0; 120 *exists = PETSC_FALSE; 121 #if defined(PETSC_HAVE_STAT_NO_CONST) 122 ierr = stat((char*) fname, &statbuf); 123 #else 124 ierr = stat(fname, &statbuf); 125 #endif 126 if (ierr) { 127 #if defined(EOVERFLOW) 128 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"); 129 #endif 130 ierr = PetscInfo1(NULL,"System call stat() failed on file %s\n",fname);CHKERRQ(ierr); 131 *exists = PETSC_FALSE; 132 } else { 133 ierr = PetscInfo1(NULL,"System call stat() succeeded on file %s\n",fname);CHKERRQ(ierr); 134 *exists = PETSC_TRUE; 135 *fileUid = statbuf.st_uid; 136 *fileGid = statbuf.st_gid; 137 *fileMode = statbuf.st_mode; 138 } 139 PetscFunctionReturn(0); 140 } 141 142 /*@C 143 PetscTestFile - checks for the existence of a file 144 145 Not Collective 146 147 Input Parameter: 148 + fname - the filename 149 - mode - either 'r', 'w', 'x' or '\0' 150 151 Output Parameter: 152 . flg - the file exists and satisfies the mode 153 154 Level: intermediate 155 156 Notes: if mode is '\0', no permissions checks are performed 157 158 .seealso: PetscTestDirectory(), PetscLs() 159 @*/ 160 PetscErrorCode PetscTestFile(const char fname[], char mode, PetscBool *flg) 161 { 162 uid_t fuid; 163 gid_t fgid; 164 int fmode; 165 PetscErrorCode ierr; 166 PetscBool exists; 167 168 PetscFunctionBegin; 169 *flg = PETSC_FALSE; 170 if (!fname) PetscFunctionReturn(0); 171 172 ierr = PetscGetFileStat(fname, &fuid, &fgid, &fmode, &exists);CHKERRQ(ierr); 173 if (!exists) PetscFunctionReturn(0); 174 /* Except for systems that have this broken stat macros (rare), this is the correct way to check for a regular file */ 175 if (!S_ISREG(fmode)) PetscFunctionReturn(0); 176 /* return if asked to check for existence only */ 177 if (mode == '\0') { *flg = exists; PetscFunctionReturn(0); } 178 ierr = PetscTestOwnership(fname, mode, fuid, fgid, fmode, flg);CHKERRQ(ierr); 179 PetscFunctionReturn(0); 180 } 181 182 /*@C 183 PetscTestDirectory - checks for the existence of a directory 184 185 Not Collective 186 187 Input Parameter: 188 + dirname - the directory name 189 - mode - either 'r', 'w', or 'x' 190 191 Output Parameter: 192 . flg - the directory exists and satisfies the mode 193 194 Level: intermediate 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 /*@C 221 PetscLs - produce a listing of the files in a directory 222 223 Collective 224 225 Input Parameter: 226 + comm - the MPI communicator 227 . dirname - the directory name 228 - tlen - the length of the buffer found[] 229 230 Output Parameter: 231 + found - listing of files 232 - flg - the directory exists 233 234 Level: intermediate 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(NULL,"ls on %s gives \n%s\n",dirname,found);CHKERRQ(ierr);} 261 #if defined(PETSC_HAVE_POPEN) 262 ierr = PetscPClose(comm,fp);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