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| author | Michael Kerrisk <mtk.manpages@gmail.com> | 2016-04-21 14:14:31 +0200 |
|---|---|---|
| committer | Michael Kerrisk <mtk.manpages@gmail.com> | 2016-04-21 14:19:34 +0200 |
| commit | 0a8909c47492a617a769dfeed7f72d96dacf927c (patch) | |
| tree | bb0889f994e504255fa7c05f1aa6a9b20beb0a1e | |
| parent | 71ffb3ed69b13e356a3c68d54dca9b9de614c73e (diff) | |
| download | man-pages-0a8909c47492a617a769dfeed7f72d96dacf927c.tar.gz | |
ld.so.8: Document use of $ORIGIN, $LIB, and $PLATFORM in environment variables
These strings are meaningful in LD_LIBRARY_PATH and LD_PRELOAD.
Reported-by: Alon Bar-Lev <alon.barlev@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
| -rw-r--r-- | man8/ld.so.8 | 50 |
1 files changed, 50 insertions, 0 deletions
diff --git a/man8/ld.so.8 b/man8/ld.so.8 index b33f417d66..e6f173c552 100644 --- a/man8/ld.so.8 +++ b/man8/ld.so.8 @@ -162,6 +162,14 @@ Use instead of .B LD_LIBRARY_PATH environment variable setting (see below). +The names +.IR ORIGIN , +.IR LIB , +and +.IR PLATFORM +are interpreted as for the +.BR LD_LIBRARY_PATH +environment variable. .TP .BI \-\-inhibit\-rpath " list" Ignore RPATH and RUNPATH information in object names in @@ -258,6 +266,31 @@ Similar to the .B PATH environment variable. This variable is ignored in secure-execution mode. + +Within the pathnames specified in +.BR LD_LIBRARY_PATH , +the dynamic linker expands the strings +.IR $ORIGIN , +.IR $LIB , +and +.IR $PLATFORM +(or the versions using curly braces around the names) +as described above in +.IR "Rpath token expansion" . +Thus, for example, +the following would cause a library to be searched for in either the +.I lib +or +.I lib64 +subdirectory below the directory containing the program to be executed: + + $ \fBLD_LIBRARY_PATH='$ORIGIN/$LIB' prog\fP + +(Note the use of single quotes, which prevent expansion of +.I ORIGIN +and +.I LIB +as shell variables!) .TP .B LD_PRELOAD A list of additional, user-specified, ELF shared @@ -269,6 +302,23 @@ In secure-execution mode, preload pathnames containing slashes are ignored, and shared objects in the standard search directories are loaded only if the set-user-ID mode bit is enabled on the shared object file. + +Within the pathnames specified in +.BR LD_PRELOAD , +the dynamic linker understands the strings +.IR $ORIGIN , +.IR $LIB , +and +.IR $PLATFORM +(or the versions using curly braces around the names) +as described above in +.IR "Rpath token expansion" . +.\" Tested with the following: +.\" +.\" LD_PRELOAD='$LIB/libmod.so' LD_LIBRARY_PATH=. ./prog +.\" +.\" which will reload the libmod.so in 'lib' or 'lib64', using it +.\" in preference to the version in '.'. .TP .B LD_TRACE_LOADED_OBJECTS (ELF only) |