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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 | |
58 | </H2> | |
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60 | <a id='l2h-2970' xml:id='l2h-2970'></a> | |
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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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