Actual source code: ftest.c

petsc-3.11.3 2019-06-26
Report Typos and Errors

  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', 'x' or '\0'

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

151:    Level: intermediate

153:    Notes: if mode is '\0', no permissions checks are performed

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

166:   *flg = PETSC_FALSE;
167:   if (!fname) return(0);

169:   PetscGetFileStat(fname, &fuid, &fgid, &fmode, &exists);
170:   if (!exists) return(0);
171:   /* Except for systems that have this broken stat macros (rare), this is the correct way to check for a regular file */
172:   if (!S_ISREG(fmode)) return(0);
173:   /* return if asked to check for existence only */
174:   if (mode == '\0') { *flg = exists; return(0); }
175:   PetscTestOwnership(fname, mode, fuid, fgid, fmode, flg);
176:   return(0);
177: }

179: /*@C
180:    PetscTestDirectory - checks for the existence of a directory

182:    Not Collective

184:    Input Parameter:
185: +  dirname - the directory name
186: -  mode - either 'r', 'w', or 'x'

188:    Output Parameter:
189: .  flg - the directory exists and satisfies the mode

191:    Level: intermediate

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

204:   *flg = PETSC_FALSE;
205:   if (!dirname) return(0);

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

213:   PetscTestOwnership(dirname, mode, fuid, fgid, fmode, flg);
214:   return(0);
215: }

217: /*@C
218:    PetscLs - produce a listing of the files in a directory

220:    Collective on MPI_Comm

222:    Input Parameter:
223: +  comm - the MPI communicator
224: .  dirname - the directory name
225: -  tlen - the length of the buffer found[]

227:    Output Parameter:
228: +  found - listing of files
229: -  flg - the directory exists

231:    Level: intermediate

233: .seealso: PetscTestFile(), PetscLs()
234: @*/
235: PetscErrorCode  PetscLs(MPI_Comm comm,const char dirname[],char found[],size_t tlen,PetscBool  *flg)
236: {
238:   size_t         len;
239:   char           *f,program[PETSC_MAX_PATH_LEN];
240:   FILE           *fp;

243:   PetscStrcpy(program,"ls ");
244:   PetscStrcat(program,dirname);
245: #if defined(PETSC_HAVE_POPEN)
246:   PetscPOpen(comm,NULL,program,"r",&fp);
247: #else
248:   SETERRQ(PETSC_COMM_SELF,PETSC_ERR_SUP_SYS,"Cannot run external programs on this machine");
249: #endif
250:   f = fgets(found,tlen,fp);
251:   if (f) *flg = PETSC_TRUE;
252:   else *flg = PETSC_FALSE;
253:   while (f) {
254:     PetscStrlen(found,&len);
255:     f    = fgets(found+len,tlen-len,fp);
256:   }
257:   if (*flg) {PetscInfo2(0,"ls on %s gives \n%s\n",dirname,found);}
258: #if defined(PETSC_HAVE_POPEN)
259:   PetscPClose(comm,fp);
260: #else
261:   SETERRQ(PETSC_COMM_SELF,PETSC_ERR_SUP_SYS,"Cannot run external programs on this machine");
262: #endif
263:   return(0);
264: }