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SQLite training in Houston TX on 2019-11-05 (details)
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Overview
Comment:Fix a problem in the unix implementation of FCNTL_SIZE_HINT on systems that do not support posix_fallocate().
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SHA1: af20eae1e6f608e4e61a07c3d14cf88c12751353
User & Date: dan 2015-01-06 21:31:47
Context
2015-01-07
14:09
Add a valgrind test to the Linux-x86_64 platform in releasetest.tcl. check-in: 4b6df035 user: drh tags: trunk
2015-01-06
21:31
Fix a problem in the unix implementation of FCNTL_SIZE_HINT on systems that do not support posix_fallocate(). check-in: af20eae1 user: dan tags: trunk
16:53
Improved and more rigorous test of large VALUES clauses. check-in: 6917d9f4 user: drh tags: trunk
Changes
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Changes to src/os_unix.c.

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      ** single byte to the last byte in each block that falls entirely
      ** within the extended region. Then, if required, a single byte
      ** at offset (nSize-1), to set the size of the file correctly.
      ** This is a similar technique to that used by glibc on systems
      ** that do not have a real fallocate() call.
      */
      int nBlk = buf.st_blksize;  /* File-system block size */

      i64 iWrite;                 /* Next offset to write to */

      iWrite = ((buf.st_size + 2*nBlk - 1)/nBlk)*nBlk-1;
      assert( iWrite>=buf.st_size );
      assert( (iWrite/nBlk)==((buf.st_size+nBlk-1)/nBlk) );
      assert( ((iWrite+1)%nBlk)==0 );
      for(/*no-op*/; iWrite<nSize; iWrite+=nBlk ){
        int nWrite = seekAndWrite(pFile, iWrite, "", 1);
        if( nWrite!=1 ) return SQLITE_IOERR_WRITE;
      }
      if( nSize%nBlk ){
        int nWrite = seekAndWrite(pFile, nSize-1, "", 1);
        if( nWrite!=1 ) return SQLITE_IOERR_WRITE;
      }
#endif
    }
  }

#if SQLITE_MAX_MMAP_SIZE>0







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      ** single byte to the last byte in each block that falls entirely
      ** within the extended region. Then, if required, a single byte
      ** at offset (nSize-1), to set the size of the file correctly.
      ** This is a similar technique to that used by glibc on systems
      ** that do not have a real fallocate() call.
      */
      int nBlk = buf.st_blksize;  /* File-system block size */
      int nWrite = 0;             /* Number of bytes written by seekAndWrite */
      i64 iWrite;                 /* Next offset to write to */

      iWrite = ((buf.st_size + 2*nBlk - 1)/nBlk)*nBlk-1;
      assert( iWrite>=buf.st_size );
      assert( (iWrite/nBlk)==((buf.st_size+nBlk-1)/nBlk) );
      assert( ((iWrite+1)%nBlk)==0 );
      for(/*no-op*/; iWrite<nSize; iWrite+=nBlk ){
        nWrite = seekAndWrite(pFile, iWrite, "", 1);
        if( nWrite!=1 ) return SQLITE_IOERR_WRITE;
      }
      if( nWrite==0 || (nSize%nBlk) ){
        nWrite = seekAndWrite(pFile, nSize-1, "", 1);
        if( nWrite!=1 ) return SQLITE_IOERR_WRITE;
      }
#endif
    }
  }

#if SQLITE_MAX_MMAP_SIZE>0