Actual source code: ftest.c

petsc-3.9.4 2018-09-11
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  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

 22: #if defined(PETSC_HAVE__ACCESS) || defined(PETSC_HAVE_ACCESS)

 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;

 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:     PetscInfo1(NULL,"System call access() succeeded on file %s\n",fname);
 37:     *flg = PETSC_TRUE;
 38:   } else {
 39:     PetscInfo1(NULL,"System call access() failed on file %s\n",fname);
 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:   return(0);
 47: }

 49: #else  /* PETSC_HAVE_ACCESS or PETSC_HAVE__ACCESS */

 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;

 62:   /* Get the number of supplementary group IDs */
 63: #if !defined(PETSC_MISSING_GETGROUPS)
 64:   numGroups = getgroups(0, gid); if (numGroups < 0) SETERRQ(PETSC_COMM_SELF,numGroups, "Unable to count supplementary group IDs");
 65:   PetscMalloc1(numGroups+1, &gid);
 66: #else
 67:   numGroups = 0;
 68: #endif

 70:   /* Get the (effective) user and group of the caller */
 71:   uid    = geteuid();
 72:   gid[0] = getegid();

 74:   /* Get supplementary group IDs */
 75: #if !defined(PETSC_MISSING_GETGROUPS)
 76:   getgroups(numGroups, gid+1); if (ierr < 0) SETERRQ(PETSC_COMM_SELF,ierr, "Unable to obtain supplementary group IDs");
 77: #endif

 79:   /* Test for accessibility */
 80:   if (fuid == uid) {
 81:     rbit = S_IRUSR;
 82:     wbit = S_IWUSR;
 83:     ebit = S_IXUSR;
 84:   } else {
 85:     int g;

 87:     for (g = 0; g <= numGroups; g++) {
 88:       if (fgid == gid[g]) {
 89:         rbit = S_IRGRP;
 90:         wbit = S_IWGRP;
 91:         ebit = S_IXGRP;
 92:         break;
 93:       }
 94:     }
 95:   }
 96:   PetscFree(gid);

 98:   if (mode == 'r') {
 99:     if (fmode & rbit) *flg = PETSC_TRUE;
100:   } else if (mode == 'w') {
101:     if (fmode & wbit) *flg = PETSC_TRUE;
102:   } else if (mode == 'x') {
103:     if (fmode & ebit) *flg = PETSC_TRUE;
104:   }
105:   return(0);
106: }

108: #endif /* PETSC_HAVE_ACCESS */

110: static PetscErrorCode PetscGetFileStat(const char fname[], uid_t *fileUid, gid_t *fileGid, int *fileMode,PetscBool  *exists)
111: {
112:   struct stat    statbuf;

116:   *fileMode = 0;
117:   *exists = PETSC_FALSE;
118: #if defined(PETSC_HAVE_STAT_NO_CONST)
119:   stat((char*) fname, &statbuf);
120: #else
121:   stat(fname, &statbuf);
122: #endif
123:   if (ierr) {
124: #if defined(EOVERFLOW)
125:     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");
126: #endif
127:     PetscInfo1(NULL,"System call stat() failed on file %s\n",fname);
128:     *exists = PETSC_FALSE;
129:   } else {
130:     PetscInfo1(NULL,"System call stat() succeeded on file %s\n",fname);
131:     *exists   = PETSC_TRUE;
132:     *fileUid  = statbuf.st_uid;
133:     *fileGid  = statbuf.st_gid;
134:     *fileMode = statbuf.st_mode;
135:   }
136:   return(0);
137: }

139: /*@C
140:    PetscTestFile - checks for the existence of a file

142:    Not Collective

144:    Input Parameter:
145: +  fname - the filename
146: -  mode - either 'r', 'w', or 'x'

148:    Output Parameter:
149: .  flg - the file exists and satisfies the mode

151:    Level: intermediate

153: .seealso: PetscTestDirectory(), PetscLs()
154: @*/
155: PetscErrorCode  PetscTestFile(const char fname[], char mode, PetscBool  *flg)
156: {
157:   uid_t          fuid;
158:   gid_t          fgid;
159:   int            fmode;
161:   PetscBool      exists;

164:   *flg = PETSC_FALSE;
165:   if (!fname) return(0);

167:   PetscGetFileStat(fname, &fuid, &fgid, &fmode,&exists);
168:   if (!exists) return(0);
169:   /* Except for systems that have this broken stat macros (rare), this is the correct way to check for a regular file */
170:   if (!S_ISREG(fmode)) return(0);

172:   PetscTestOwnership(fname, mode, fuid, fgid, fmode, flg);
173:   return(0);
174: }

176: /*@C
177:    PetscTestDirectory - checks for the existence of a directory

179:    Not Collective

181:    Input Parameter:
182: +  dirname - the directory name
183: -  mode - either 'r', 'w', or 'x'

185:    Output Parameter:
186: .  flg - the directory exists and satisfies the mode

188:    Level: intermediate

190: .seealso: PetscTestFile(), PetscLs()
191: @*/
192: PetscErrorCode  PetscTestDirectory(const char dirname[],char mode,PetscBool  *flg)
193: {
194:   uid_t          fuid;
195:   gid_t          fgid;
196:   int            fmode;
198:   PetscBool      exists;

201:   *flg = PETSC_FALSE;
202:   if (!dirname) return(0);

204:   PetscGetFileStat(dirname, &fuid, &fgid, &fmode,&exists);
205:   if (!exists) return(0);
206:   /* Except for systems that have this broken stat macros (rare), this
207:      is the correct way to check for a directory */
208:   if (!S_ISDIR(fmode)) return(0);

210:   PetscTestOwnership(dirname, mode, fuid, fgid, fmode, flg);
211:   return(0);
212: }

214: /*@C
215:    PetscLs - produce a listing of the files in a directory

217:    Collective on MPI_Comm

219:    Input Parameter:
220: +  comm - the MPI communicator
221: .  dirname - the directory name
222: -  tlen - the length of the buffer found[]

224:    Output Parameter:
225: +  found - listing of files
226: -  flg - the directory exists

228:    Level: intermediate

230: .seealso: PetscTestFile(), PetscLs()
231: @*/
232: PetscErrorCode  PetscLs(MPI_Comm comm,const char dirname[],char found[],size_t tlen,PetscBool  *flg)
233: {
235:   size_t         len;
236:   char           *f,program[PETSC_MAX_PATH_LEN];
237:   FILE           *fp;

240:   PetscStrcpy(program,"ls ");
241:   PetscStrcat(program,dirname);
242: #if defined(PETSC_HAVE_POPEN)
243:   PetscPOpen(comm,NULL,program,"r",&fp);
244: #else
245:   SETERRQ(PETSC_COMM_SELF,PETSC_ERR_SUP_SYS,"Cannot run external programs on this machine");
246: #endif
247:   f = fgets(found,tlen,fp);
248:   if (f) *flg = PETSC_TRUE;
249:   else *flg = PETSC_FALSE;
250:   while (f) {
251:     PetscStrlen(found,&len);
252:     f    = fgets(found+len,tlen-len,fp);
253:   }
254:   if (*flg) {PetscInfo2(0,"ls on %s gives \n%s\n",dirname,found);}
255: #if defined(PETSC_HAVE_POPEN)
256:   PetscPClose(comm,fp);
257: #else
258:   SETERRQ(PETSC_COMM_SELF,PETSC_ERR_SUP_SYS,"Cannot run external programs on this machine");
259: #endif
260:   return(0);
261: }