man linux32 (Commandes) - Set 32 bit uname emulation processes. linux64 - Reset uname emulation
NAME
linux32 - Set 32 bit uname emulation processes.
linux64 - Reset uname emulation
SYNOPSIS
linux32
[
--3gb
]
[
--4gb
]
command arguments...
linux64
command arguments...
DESCRIPTION
linux32 changes the personality of command and all its children to return the 32 bit architecture name. On x86_64 and ia64 the output of uname -m would return i686 instead of the real one. This is useful to fool shell scripts or programs that check for the architecture explicitely into believing that they run on a true 32 bit system.
When the --3gb option is used moves the top of stack of the 32bit child processes to 0xc0000000. This is useful to execute some broken applications that break when the stack top is at 4GB. On the other hand it limits the usable heap memory more than necessary. This option might not work on all architectures. When --4gb (default) is specified this is not done.
linux64 resets the uname personality to default. Note that when run on an i386 class machine this has no effect.