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| 55 | <H2><A NAME="SECTION0010110000000000000000"></A><A NAME="posix-large-files"></A> |
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| 57 | 8.1.1 Large File Support |
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| 62 | <P> |
| 63 | Several operating systems (including AIX, HPUX, Irix and Solaris) |
| 64 | provide support for files that are larger than 2 Gb from a C |
| 65 | programming model where <tt class="ctype">int</tt> and <tt class="ctype">long</tt> are 32-bit |
| 66 | values. This is typically accomplished by defining the relevant size |
| 67 | and offset types as 64-bit values. Such files are sometimes referred |
| 68 | to as <i class="dfn">large files</i>. |
| 69 | |
| 70 | <P> |
| 71 | Large file support is enabled in Python when the size of an |
| 72 | <tt class="ctype">off_t</tt> is larger than a <tt class="ctype">long</tt> and the <tt class="ctype">long long</tt> |
| 73 | type is available and is at least as large as an <tt class="ctype">off_t</tt>. Python |
| 74 | longs are then used to represent file sizes, offsets and other values |
| 75 | that can exceed the range of a Python int. It may be necessary to |
| 76 | configure and compile Python with certain compiler flags to enable |
| 77 | this mode. For example, it is enabled by default with recent versions |
| 78 | of Irix, but with Solaris 2.6 and 2.7 you need to do something like: |
| 79 | |
| 80 | <P> |
| 81 | <div class="verbatim"><pre> |
| 82 | CFLAGS="`getconf LFS_CFLAGS`" OPT="-g -O2 $CFLAGS" \ |
| 83 | ./configure |
| 84 | </pre></div> |
| 85 | <P> |
| 86 | On large-file-capable Linux systems, this might work: |
| 87 | |
| 88 | <P> |
| 89 | <div class="verbatim"><pre> |
| 90 | CFLAGS='-D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64' OPT="-g -O2 $CFLAGS" \ |
| 91 | ./configure |
| 92 | </pre></div> |
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