CHLIB

Section: Maintenance Commands (8)
Updated: Aug 1993
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NAME

chlib - update link to a Linux shared library

SYNOPSIS

chlib [ -v ] [ -f ] newlib [ linkdir ]

DESCRIPTION

chlib updates the symbolic link to a Linux shared library. newlib is the full name of the new shared library (e.g. /lib/libc.so.4.4.1). If specified, linkdir is the directory where the symbolic link will be placed. The default is to place the link in /lib.

To ensure the system is left in a usable state, chlib performs several sanity checks on the new shared library and the current shared library, if one exists, before updating the link. These checks include the following:

: linkdir must be an existing directory.

: newlib must be a valid shared library name.

: If newlib is specified with a relative path and linkdir is specified with an absolute path, linkdir must be the current directory.

: newlib must be a valid shared library image.

: If the link already points to a shared library, newlib must have the same load address as the existing library.

: If the link already points to a shared library, newlib must have the same major version number as the existing library.

: If the link already points to a shared library, newlib must have a higher, minor version number than the existing library. This check can be overridden with the -f option.

OPTIONS

-v: Print the program version number and exit.
-f: Force the link to be updated even if newlib does not have a higher, minor version than the existing library.

NOTES

To provide the highest degree of security in case of problems, chlib should be linked statically.

BUGS

There is a very short period between the time an existing link is removed and the new link is created. Programs started during this time will not be able to find the library.

AUTHOR

David Engel (david@ods.com)

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Time: 14:46:49 GMT, November 05, 2024